A vibration avoidance method, device, system and cabinet air conditioner for a cabinet air conditioner

Abstract

The application discloses a vibration-avoiding method, device and system of a cabinet air conditioner and the cabinet air conditioner, and relates to the technical field of energy-saving air conditioners. The method comprises the following steps: acquiring an acceleration signal representing the vibration acceleration of the cabinet air conditioner in a running state through a vibration sensor; and acquiring a displacement signal representing the displacement of the cabinet air conditioner relative to a cabinet through a displacement sensor. The amplitude of the acceleration signal is compared with a preset first vibration threshold value, and when the amplitude exceeds the first vibration threshold value, it is determined that the cabinet air conditioner is in a suspected resonance working condition. Then, the amplitude of the displacement signal is compared with a preset second vibration threshold value, and when the amplitude exceeds the second vibration threshold value, it is determined that the cabinet air conditioner is in a resonance working condition. At this time, the current running frequency of the compressor is adjusted upwards or downwards according to a preset frequency adjustment amount. The application uses the acceleration amplitude and the displacement amplitude to form two-level judgment conditions to identify the resonance working condition, and adjusts the running frequency of the compressor to make it deviate from the resonance point, thereby solving the problem that the cabinet air conditioner cannot identify and avoid resonance, reducing abnormal noise, and improving the running stability.

Description

Technical Field

[0001] This invention relates to the field of energy-saving air conditioning technology, and in particular to a vibration damping method, device, system, and cabinet air conditioner. Background Technology

[0002] A rack-mounted air conditioner is an air conditioning unit installed on a rack or cabinet to cool and dissipate heat within the rack. It is widely used in outdoor communication racks, energy storage racks, power switchgear, and small data centers. Rack-mounted air conditioners are typically mounted on the side wall or door of the rack, either suspended or embedded. During operation, the compressor, fan, and other components inside generate periodic vibrations, which are transmitted to the rack or cabinet via the air conditioner's casing and its mounting structure.

[0003] To improve the energy efficiency of rack-mount air conditioners and adapt them to changes in the internal heat load of the rack, most current rack-mount air conditioners use inverter compressors. The compressor's operating frequency is continuously adjusted within a wide frequency range to adapt to changes in the internal heat load of the rack. Meanwhile, the rack itself has a natural frequency. During the actual operation of the rack-mount air conditioner, when the excitation frequency generated by the compressor at a certain operating frequency is close to or an integer multiple of the rack's natural frequency, resonance occurs between the air conditioner and the rack, resulting in a significant increase in vibration amplitude.

[0004] In existing technologies, rack-mounted air conditioners primarily suppress the aforementioned resonance phenomenon passively. For example, they may add rubber damping pads or washers between the air conditioner and the rack to increase damping along the vibration transmission path, or add reinforcing ribs to the rack to alter its structural rigidity. The effectiveness of these methods is determined upon assembly of the rack-mounted air conditioner and does not change with the compressor's operating frequency during operation.

[0005] It is evident that existing rack-mounted air conditioners lack the ability to identify resonance conditions between themselves and the rack during operation. Consequently, they cannot make targeted adjustments to the compressor's operating frequency to avoid resonance points when resonance occurs. This results in the resonance state persisting while the compressor maintains that operating frequency, leading to abnormal noise, fatigue of structural components in both the rack-mounted air conditioner and the rack, and damage to internal components, thus affecting the operational stability of the rack-mounted air conditioner and the equipment within the rack. Summary of the Invention

[0006] This invention provides a vibration damping method, device, system, and cabinet air conditioner, aiming to solve the technical problem that in the prior art, cabinet air conditioners do not have the ability to identify resonance conditions between themselves and the cabinet during operation, and therefore cannot actively avoid resonance by adjusting the operating frequency of the compressor.

[0007] In a first aspect, embodiments of the present invention provide a vibration damping method for a rack-mounted air conditioner, wherein the rack-mounted air conditioner is installed on a rack, a vibration sensor is disposed between the rack-mounted air conditioner and the rack, and a displacement sensor is disposed on the rack-mounted air conditioner; the vibration damping method includes: The vibration sensor acquires an acceleration signal characterizing the vibration acceleration of the cabinet air conditioner during operation, and the displacement sensor acquires a displacement signal characterizing the displacement of the cabinet air conditioner relative to the cabinet. The amplitude of the acceleration signal is extracted and compared with a preset first vibration threshold. When the amplitude of the acceleration signal exceeds the first vibration threshold, the cabinet air conditioner is determined to be in a suspected resonance condition. When the cabinet air conditioner is in a suspected resonance condition, the amplitude of the displacement signal is extracted and compared with a preset second vibration threshold. When the amplitude of the displacement signal exceeds the second vibration threshold, it is determined that the cabinet air conditioner is in a resonance condition. When the cabinet air conditioner is in resonance mode, the current operating frequency of the compressor is adjusted upward or downward according to the preset frequency adjustment amount.

[0008] Secondly, embodiments of the present invention provide a vibration damping device for a rack-mounted air conditioner, wherein the rack-mounted air conditioner is installed on a rack, a vibration sensor is provided between the rack-mounted air conditioner and the rack, and a displacement sensor is provided on the rack-mounted air conditioner. The vibration damping device includes: The signal acquisition unit is used to acquire, through the vibration sensor, an acceleration signal characterizing the vibration acceleration of the cabinet air conditioner in operation, and through the displacement sensor, a displacement signal characterizing the displacement of the cabinet air conditioner relative to the cabinet. The first determination unit is used to extract the amplitude of the acceleration signal and compare it with a preset first vibration threshold. When the amplitude of the acceleration signal exceeds the first vibration threshold, the cabinet air conditioner is determined to be in a suspected resonance condition. The second determination unit is used to extract the amplitude of the displacement signal and compare it with a preset second vibration threshold when the cabinet air conditioner is in a suspected resonance condition. When the amplitude of the displacement signal exceeds the second vibration threshold, the cabinet air conditioner is determined to be in a resonance condition. The frequency adjustment unit is used to adjust the current operating frequency of the compressor upward or downward according to a preset frequency adjustment amount when the cabinet air conditioner is in resonance mode.

[0009] Thirdly, embodiments of the present invention provide a vibration damping system for a cabinet air conditioner, including the vibration damping device for the cabinet air conditioner of the second aspect.

[0010] Fourthly, embodiments of the present invention provide a cabinet air conditioner, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the vibration damping method of the cabinet air conditioner of the first aspect.

[0011] This invention provides a vibration damping method for a rack-mounted air conditioner. The rack-mounted air conditioner is installed on a rack, and a vibration sensor is installed between the air conditioner and the rack. A displacement sensor is installed on the air conditioner. The vibration damping method includes: acquiring an acceleration signal representing the vibration acceleration of the air conditioner during operation using the vibration sensor, and acquiring a displacement signal representing the displacement of the air conditioner relative to the rack using the displacement sensor; extracting the amplitude of the acceleration signal and comparing it with a preset first vibration threshold; if the amplitude of the acceleration signal exceeds the first vibration threshold, determining that the air conditioner is in a suspected resonance condition; if the air conditioner is in a suspected resonance condition, extracting the amplitude of the displacement signal and comparing it with a preset second vibration threshold; if the amplitude of the displacement signal exceeds the second vibration threshold, determining that the air conditioner is in a resonance condition; if the air conditioner is in a resonance condition, adjusting the current operating frequency of the compressor upwards or downwards according to a preset frequency adjustment amount. This invention utilizes a vibration sensor installed between the air conditioner and the cabinet, and a displacement sensor installed on the air conditioner to acquire acceleration signals representing the vibration acceleration of the air conditioner and displacement signals representing the displacement of the air conditioner relative to the cabinet, respectively. A two-level, progressively advancing judgment logic is established, using the amplitude of the acceleration signal exceeding a first vibration threshold as a condition for suspected resonance, and the amplitude of the displacement signal exceeding a second vibration threshold as a condition for resonance. This enables online identification of resonance conditions during the operation of the air conditioner. Furthermore, it determines when the air conditioner is in resonance. During operation, the compressor's current operating frequency is adjusted upwards or downwards according to a preset frequency adjustment amount, causing the excitation frequency generated by the compressor to deviate from the frequency point that triggers resonance. This allows the cabinet air conditioner to escape the resonance condition, solving the technical problems in the prior art where cabinet air conditioners lack the ability to identify resonance conditions between themselves and the cabinet, and cannot actively avoid resonance by adjusting the compressor's operating frequency. This shortens the duration of the cabinet air conditioner in the resonance condition, reduces abnormal noise caused by resonance and fatigue of the structural components of the cabinet air conditioner and the cabinet, and improves the operational stability of the cabinet air conditioner and the internal components of the cabinet.

[0012] The present invention also provides a vibration damping device for a cabinet air conditioner, a vibration damping system for a cabinet air conditioner, and a cabinet air conditioner, which also have the above-mentioned beneficial effects. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic flowchart illustrating a vibration damping method for a cabinet air conditioner provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the installation of a cabinet air conditioner according to an embodiment of the present invention; Figure 3 This is another schematic flowchart illustrating a vibration damping method for a cabinet air conditioner provided in an embodiment of the present invention; Figure 4 A flowchart for determining the running status provided in an embodiment of the present invention; Figure 5 A flowchart of the shielding operation provided in an embodiment of the present invention; Figure 6 A flowchart for resonance determination provided in an embodiment of the present invention; Figure 7 This is a schematic block diagram of a vibration damping device for a cabinet air conditioner provided in an embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures: 700. Vibration damping device for cabinet air conditioner; 701. Signal acquisition unit; 702. First determination unit; 703. Second determination unit; 704. Frequency adjustment unit. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0018] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0019] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0020] Please see below. Figure 1 , Figure 1 The flowchart of a vibration damping method for a cabinet air conditioner provided in an embodiment of the present invention specifically includes steps S101 to S104.

[0021] The rack air conditioner is installed on the rack, a vibration sensor is installed between the rack air conditioner and the rack, and a displacement sensor is installed on the rack air conditioner. S101. Obtain the acceleration signal representing the vibration acceleration of the cabinet air conditioner in operation through the vibration sensor and obtain the displacement signal representing the displacement of the cabinet air conditioner relative to the cabinet through the displacement sensor. S102. Extract the amplitude of the acceleration signal and compare it with a preset first vibration threshold. When the amplitude of the acceleration signal exceeds the first vibration threshold, determine that the cabinet air conditioner is in a suspected resonance condition. S103. When the cabinet air conditioner is in a suspected resonance condition, the amplitude of the displacement signal is extracted and compared with a preset second vibration threshold. When the amplitude of the displacement signal exceeds the second vibration threshold, it is determined that the cabinet air conditioner is in a resonance condition. S104. When the cabinet air conditioner is in resonance mode, the current operating frequency of the compressor is adjusted upward or downward according to the preset frequency adjustment amount.

[0022] Combination Figure 2 and Figure 3As shown, in step S101, the vibration sensor and the displacement sensor together constitute a dual-sensor detection system for multi-dimensional detection of the vibration of the cabinet air conditioner. The vibration sensor is disposed between the cabinet air conditioner and the cabinet and is used to output an acceleration signal characterizing the vibration acceleration of the cabinet air conditioner. The displacement sensor is disposed on the cabinet air conditioner and is used to output a displacement signal characterizing the displacement of the cabinet air conditioner relative to the cabinet. The above two signals are synchronously acquired and processed by the main control unit (MCU) of the cabinet air conditioner. The two sensors detect the vibration of the cabinet air conditioner in real time, and their signal waveforms jointly reflect the vibration state of the cabinet air conditioner.

[0023] It should be noted that, in the embodiments of the present invention, the cabinet air conditioner refers to an air conditioning unit installed on the cabinet body of a cabinet and used for cooling and heat dissipation of the internal space of the cabinet. It mainly includes components such as a compressor, condenser, throttling element, evaporator, and fan. The compressor is the main vibration source of the cabinet air conditioner during operation. The resonance mentioned in the embodiments of the present invention refers to the vibration phenomenon in which the vibration amplitude between the cabinet air conditioner and the cabinet increases significantly when the excitation frequency generated by the compressor of the cabinet air conditioner at a certain operating frequency is close to or an integer multiple of the natural frequency of the cabinet. The vibration isolation mentioned in the embodiments of the present invention refers to the process of changing the operating frequency of the compressor to make the excitation frequency generated by the compressor deviate from the frequency point that causes the above resonance phenomenon, thereby making the cabinet air conditioner escape the resonance state.

[0024] Please see Figure 2 , Figure 2 This is a schematic diagram illustrating the installation of a rack-mounted air conditioner according to an embodiment of the present invention. The rack-mounted air conditioner is installed on the rack, and its housing is connected to the rack body via a fixing structure. A vibration sensor is disposed between the rack-mounted air conditioner and the rack, with one side of the vibration sensor contacting the housing of the rack-mounted air conditioner and the other side contacting the rack body, thus placing the vibration sensor directly on the transmission path of vibration from the rack-mounted air conditioner to the rack. A displacement sensor is disposed on the rack-mounted air conditioner, with its detection end facing the rack body surface, thereby enabling the detection of the relative displacement between the rack-mounted air conditioner and the rack. Figure 2 As can be seen, the vibration sensor and the displacement sensor are arranged independently in space, and detect the same vibration process from two different physical dimensions: vibration energy and relative displacement.

[0025] The rack-mounted air conditioner is also equipped with a main control unit (MCU). The MCU is electrically connected to both the vibration sensor and the displacement sensor, and is used to acquire, condition, and process the electrical signals output by these two sensors. The MCU is also electrically connected to the compressor drive circuit of the rack-mounted air conditioner, and is used to output frequency control commands to adjust the compressor's operating frequency. In a specific example, the MCU has an analog-to-digital converter (ADC) function and can collect multiple analog signals. The outputs of the vibration sensor and the displacement sensor are respectively connected to two ADC channels of the MCU, enabling the MCU to convert the two analog electrical signals into digital quantities that can be processed.

[0026] Specifically, when the rack-mounted air conditioner is in operation, the operation of its compressor and fan generates excitation force, which causes the air conditioner's casing to vibrate. This vibration of the casing and the rack-mounted unit produce periodic acceleration measurements. The vibration sensor, excited by these periodic acceleration measurements, generates a corresponding periodic pulse electrical signal. The main control unit (MCU) collects and processes this electrical signal into a time-voltage waveform, with its amplitude denoted as V1 and frequency as P1. The voltage value of amplitude V1 represents the vibration acceleration of the rack-mounted air conditioner in its current operating state, and the waveform frequency P1 represents the vibration frequency of the rack-mounted air conditioner. Therefore, the acceleration signal mentioned in step S101 is the time-voltage waveform obtained after processing by the main control unit (MCU).

[0027] Meanwhile, when the rack air conditioner is in operation, the vibration of the rack air conditioner's casing generates periodic displacement between it and the rack. The displacement sensor collects the relative displacement value between the rack air conditioner and the rack, and converts this relative displacement value into an electrical signal. This electrical signal is collected and processed by the main control unit (MCU), and is denoted as V2. The value of the electrical signal V2 can characterize the amplitude of the rack air conditioner relative to the rack; that is, the displacement signal mentioned in step S101 is the electrical signal output by the displacement sensor and processed by the main control unit (MCU).

[0028] In one specific example, the displacement sensor can be an eddy current displacement sensor, with its probe fixed to the side wall of the air conditioner cabinet and facing the cabinet body. A certain initial gap is maintained between the probe and the cabinet body. When the air conditioner cabinet moves relative to the cabinet, the initial gap changes accordingly, and the eddy current displacement sensor outputs a corresponding electrical signal based on the change in gap. In another specific example, the displacement sensor can also be an inductive displacement sensor or a laser displacement sensor, as long as it can output an electrical signal characterizing the displacement of the air conditioner cabinet relative to the cabinet. This embodiment of the invention does not limit this.

[0029] In a specific example, the main control unit (MCU) can synchronously sample the two electrical signals according to a preset sampling period. For example, it can sample the acceleration signal and the displacement signal at a sampling frequency of 1 kHz, and use 20 ms as a data window. Within each data window, the sampled data sequence is denoised and rectified, and the peak value within the data window is taken as the amplitude output of the data window, thereby obtaining the amplitude V1 of the acceleration signal and the amplitude V2 of the displacement signal that are updated over time. For the frequency P1, the main control unit (MCU) can obtain it by counting the number of zero crossings or the number of pulses of the pulse electrical signal per unit time and converting the result.

[0030] It should be noted that the acceleration signal and the displacement signal are synchronously acquired by the main control unit MCU under the same time reference, and the two correspond one-to-one in timing. This ensures that the subsequent judgment based on the amplitude of the acceleration signal and the amplitude of the displacement signal is aimed at the vibration state of the cabinet air conditioner at the same moment, avoiding distortion of the judgment result due to the inconsistent acquisition time of the two signals.

[0031] In a specific example, to avoid interference from the electromagnetic environment inside the cabinet to the two electrical signals, the signal lines between the vibration sensor and the displacement sensor and the main control unit MCU can be shielded cables. Furthermore, the main control unit MCU is equipped with a low-pass filter circuit at its signal input end to filter out high-frequency interference components that are higher than the vibration frequency range of the cabinet air conditioner, thereby ensuring the acquisition accuracy of the amplitude V1, the frequency P1, and the amplitude V2.

[0032] Since the resonance between the air conditioner and the cabinet is a physical phenomenon that simultaneously possesses vibration energy and vibration displacement characteristics, a single-dimensional detection quantity is insufficient to provide a complete characterization. The acceleration signal reflects the magnitude of the air conditioner's acceleration during vibration; it is more sensitive to vibrations with small amplitude and high frequency, and can reflect changes in the air conditioner's vibration energy earlier. The displacement signal reflects the amount of displacement of the air conditioner relative to the cabinet, directly corresponding to the amplitude of the relative motion between the air conditioner and the cabinet, and can characterize the actual degree to which vibration is transmitted to the cabinet body. In this embodiment of the invention, acquiring both signals simultaneously in step S101 is intended to use both as the basis for determining the resonance condition in subsequent steps S102 and S103.

[0033] In one specific example, the vibration sensor can be a single sensor positioned at a location where the stress is concentrated between the air conditioner's housing and the cabinet. In another specific example, the vibration sensor can be multiple sensors, distributed along the contact area between the air conditioner and the cabinet. The main control unit (MCU) takes the maximum amplitude of the signals output by the multiple vibration sensors as the amplitude V1 of the acceleration signal. The number and arrangement of the displacement sensors are similar and will not be described further here.

[0034] It should also be noted that the operating state mentioned in step S101 refers to the state in which the compressor of the rack air conditioner is running and performing cooling or heat dissipation on the internal space of the rack. When the rack air conditioner is not running, its compressor does not generate periodic excitation force. Even if the vibration sensor and displacement sensor output electrical signals due to external factors, these signals do not characterize the vibration caused by the rack air conditioner's own operation. Therefore, the vibration isolation method only analyzes and compares the two signals when the rack air conditioner is running.

[0035] Please see Figure 3 , Figure 3This is another schematic diagram of a vibration damping method for a rack-mounted air conditioner provided by an embodiment of the present invention, illustrating the complete logic of the vibration damping method in actual operation. After the rack-mounted air conditioner is turned on, the vibration sensor generates periodic pulse electrical signals, and the displacement sensor generates electrical signals characterizing the relative displacement between the rack-mounted air conditioner and the rack. The main control unit (MCU) first determines whether the rack-mounted air conditioner is currently in operation based on the frequency P1 of the pulse electrical signals. After confirming that the rack-mounted air conditioner is in operation, it sequentially executes a first-level logic judgment based on the amplitude V1 and a second-level logic judgment based on the amplitude V2. When it is determined that the rack-mounted air conditioner is in a resonance condition, the main control unit (MCU) records the current compressor operating frequency, shields the frequency, and adjusts the compressor operating frequency according to a preset frequency adjustment amount. Subsequently, the compressor continues to run at the adjusted operating frequency and continues to perform resonance condition judgment until the rack-mounted air conditioner leaves the resonance condition and exits the current vibration damping process, until the next resonance is detected, the above process is restarted.

[0036] In a specific example, the main control unit (MCU) initiates the signal acquisition process as soon as the cabinet air conditioner is turned on and runs, and continues to execute it throughout the entire operation of the cabinet air conditioner. This enables the vibration damping method to continuously monitor the vibration state of the cabinet air conditioner at various operating frequencies online, rather than being limited to a specific stage when the cabinet air conditioner is turned on.

[0037] In a specific example, the main control unit MCU can also store the amplitude V1, frequency P1 and amplitude V2 obtained in each data window together with their corresponding time into its internal data buffer and retain the data within the most recent period. When the cabinet air conditioner needs to perform operational status backtracking, the above data can be exported through the communication interface of the cabinet air conditioner to analyze the vibration of the cabinet air conditioner during that period.

[0038] It should also be noted that, Figure 1 Steps S101 to S104 shown are Figure 3 The processes shown are logically corresponding to each other: Figure 3 The process in which the vibration sensor generates periodic pulse electrical signals, the displacement sensor generates electrical signals characterizing relative displacement, and these signals are collected by the main control unit MCU, corresponds to step S101. Figure 3 The comparison step based on the amplitude V1 and the first vibration threshold A0 corresponds to step S102; Figure 3 The comparison step based on the amplitude V2 and the second vibration threshold L0 corresponds to step S103; Figure 3The adjustment of the compressor operating frequency based on the frequency modulation bandwidth ΔP corresponds to step S104.

[0039] Combination Figure 4 As shown, in one embodiment, before step S101, the following steps are included: Extract the frequency of the acceleration signal collected by the vibration sensor and compare the frequency with a preset average frequency. When the frequency is lower than the average frequency, the cabinet air conditioner is determined to be in a non-operating state and enters a standby monitoring state. When the frequency is not lower than the average frequency, the cabinet air conditioner is determined to be in operation.

[0040] In this embodiment, the vibration sensor continuously outputs periodic pulse electrical signals after the cabinet air conditioner is turned on. Before analyzing and comparing the amplitude of the acceleration signal and the amplitude of the displacement signal, the main control unit MCU first extracts the frequency P1 of the acceleration signal collected by the vibration sensor and compares the frequency P1 with the preset average frequency P to determine whether the cabinet air conditioner is currently in operation.

[0041] Wherein, the average frequency P is the average frequency of the vibration sensor signal waveform period when the rack air conditioner is operating normally, that is, the statistical average value of the waveform frequency of the pulse electrical signal output by the vibration sensor when the rack air conditioner of this model is operating normally within the adjustable frequency range of its compressor. The average frequency P is pre-determined before the rack air conditioner leaves the factory and stored in the memory of the main control unit MCU for the rack air conditioner to recall during actual operation.

[0042] When the frequency P1 is lower than the average frequency P, it indicates that the pulse electrical signal output by the vibration sensor is not excited by the periodic excitation force generated by the continuous operation of the compressor. Based on this, it is determined that the cabinet air conditioner is in a non-operating state, and at this time, the cabinet air conditioner enters a standby monitoring state. In this embodiment of the invention, the standby monitoring state refers to a state in which the main control unit MCU maintains monitoring of the signal output by the vibration sensor, but does not perform analysis and comparison of the data collected by the vibration sensor and the displacement sensor. That is, in this state, the main control unit MCU does not perform amplitude comparison and resonance condition determination in steps S102 and S103, nor does it perform frequency adjustment in step S104.

[0043] When the frequency P1 is not lower than the average frequency P, the pulse electrical signal output by the vibration sensor is considered to be a continuous pulse. Based on this, it is determined that the cabinet air conditioner is in operation, that is, the compressor of the cabinet air conditioner is currently in normal operation. At this time, the main control unit MCU continues to execute the acquisition of the acceleration signal and the displacement signal in step S101, as well as the subsequent steps S102 to S104.

[0044] In a specific example, if the average frequency P of a certain type of cabinet air conditioner is calibrated to 45Hz, then when the frequency P1 extracted by the main control unit MCU is 3Hz, since 3Hz is lower than 45Hz, the main control unit MCU determines that the cabinet air conditioner is in a non-operating state, and the cabinet air conditioner enters a standby monitoring state; when the frequency P1 extracted by the main control unit MCU is 52Hz, since 52Hz is not lower than 45Hz, the main control unit MCU determines that the cabinet air conditioner is in an operating state, and continues to execute the subsequent resonance condition determination process.

[0045] In a specific example, the main control unit MCU can periodically extract and compare the frequency P1 according to a preset monitoring cycle in the standby monitoring state, for example, extracting and comparing once every 1 second; once the frequency P1 is not lower than the average frequency P, the main control unit MCU exits the standby monitoring state and enters the process of analyzing and comparing the amplitude of the acceleration signal and the amplitude of the displacement signal.

[0046] By adding the frequency-based judgment before step S101, the main control unit MCU can confirm whether the cabinet air conditioner is in operation before performing amplitude comparison, thereby avoiding unnecessary analysis and comparison triggered by vibration caused by external factors when the cabinet air conditioner is not in operation, reducing the invalid calculation and power consumption of the main control unit MCU; at the same time, since the vibration damping method only makes a judgment on the resonance condition when the cabinet air conditioner is in operation, it also reduces the possibility of misjudging external vibration as resonance condition when not in operation.

[0047] In a specific example, the frequency mean P is determined as follows: during the research and development phase of the cabinet air conditioner, the compressor is made to run stably at multiple frequency points within its adjustable frequency range, and the waveform frequency of the pulse electrical signal output by the vibration sensor is recorded at each frequency point. The average value of the recorded values ​​at each frequency point is taken as the frequency mean P. To reduce the influence of individual differences, the above measurement can also be performed on multiple cabinet air conditioners of the same model, and the average value of the results is taken as the final frequency mean P.

[0048] It should be noted that when the frequency P1 is exactly equal to the average frequency P, since this situation is considered to be when the frequency P1 is not lower than the average frequency P, the main control unit MCU determines that the cabinet air conditioner is in operation.

[0049] In a specific example, in the standby monitoring state of the cabinet air conditioner, the main control unit MCU only keeps the function of extracting the frequency of the pulse electrical signal output by the vibration sensor in working state, while the calculation module used for amplitude extraction and threshold comparison is placed in a low power consumption state, thereby further reducing the power consumption of the main control unit MCU during the period when the cabinet air conditioner is not running; when the frequency P1 is not lower than the average frequency P, the main control unit MCU wakes up the above-mentioned calculation module and switches to the normal analysis and comparison process.

[0050] In one embodiment, the vibration sensor is a piezoelectric sensor, and the vibration sensor is installed between the cabinet air conditioner and the side wall of the cabinet.

[0051] In this embodiment, the vibration sensor is a piezoelectric sensor. The piezoelectric sensor operates based on the piezoelectric effect; when the piezoelectric material inside is deformed under external force, it generates charges on its two opposing surfaces corresponding to the applied force, thereby generating a corresponding voltage at its output terminal. Since the external force acting on the piezoelectric sensor corresponds to the acceleration of the air conditioner's vibration, the voltage value output by the piezoelectric sensor can represent the vibration acceleration of the air conditioner, and the waveform frequency of the output voltage can represent the vibration frequency of the air conditioner.

[0052] The piezoelectric sensor is installed between the air conditioner and the side wall of the cabinet, specifically, the piezoelectric sensor is clamped between the air conditioner housing and the cabinet side wall, with one force-bearing surface in contact with the air conditioner housing and the other force-bearing surface in contact with the cabinet side wall. When the air conditioner is running, a periodic relative force is generated between the air conditioner housing and the cabinet side wall. This periodic force is directly applied to the piezoelectric sensor, causing it to generate a periodic pulse electrical signal.

[0053] The main path for the transmission of vibration from the air conditioner to the cabinet is between the air conditioner and the side wall of the cabinet. By installing the piezoelectric sensor at this location, placing it directly on this vibration transmission path, the vibration of the air conditioner housing can directly act on the piezoelectric sensor through compression and deformation, without requiring transmission through other intermediate structures. Therefore, the electrical signal output by the piezoelectric sensor can more accurately reflect the vibration between the air conditioner and the cabinet, with minimal signal attenuation and phase lag, which helps improve the detection accuracy of the acceleration signal amplitude V1 and frequency P1.

[0054] In a specific example, the piezoelectric sensor can be fabricated as a sheet structure with its thickness direction aligned with the force direction. During installation, it is pre-tightened and pressed between the housing of the air conditioner and the side wall of the cabinet, so that the piezoelectric sensor maintains a certain pre-pressure when the air conditioner is stationary. This ensures that the piezoelectric sensor is always under pressure when the air conditioner vibrates, preventing distortion of the pulse electrical signal caused by momentary detachment between the piezoelectric sensor and the housing of the air conditioner or the side wall of the cabinet.

[0055] In a specific example, the piezoelectric material used in the piezoelectric sensor can be lead zirconate titanate piezoelectric ceramic, which has a large piezoelectric constant and can output a higher voltage under the same stress conditions, which is beneficial for the main control unit MCU to acquire and process the pulse electrical signal.

[0056] Furthermore, the piezoelectric sensor is a self-generating sensor, which generates its own charge when subjected to external force, without the need for an additional excitation power source. Therefore, the wiring required for its connection to the electrical system of the cabinet air conditioner is relatively simple, and it does not increase the power consumption of the cabinet air conditioner during operation.

[0057] In one specific example, a piezoelectric sensor can be installed between the rack air conditioner and the side wall of the rack. The piezoelectric sensor is located at the geometric center of the contact area between the housing of the rack air conditioner and the side wall of the rack. In another specific example, two piezoelectric sensors can also be installed along the diagonal of the contact area between the rack air conditioner and the side wall of the rack. The main control unit MCU takes the larger amplitude of the voltage waveform output by the two piezoelectric sensors as the amplitude V1 of the acceleration signal to avoid missing areas with more severe local vibrations due to single-point arrangement.

[0058] In a specific example, a charge amplification circuit can also be provided between the output terminal of the piezoelectric sensor and the main control unit MCU. The charge amplification circuit converts the charge output by the piezoelectric sensor into a proportional voltage and amplifies it, and then sends it to the analog-to-digital conversion channel of the main control unit MCU so that the main control unit MCU can extract the amplitude V1 and frequency P1 of the acceleration signal.

[0059] In a specific example, the frequency response range of the piezoelectric sensor should cover the vibration frequency range generated by the cabinet air conditioner during operation within the adjustable frequency range of its compressor, thereby ensuring that the piezoelectric sensor can output the corresponding pulse electrical signal at each operating frequency of the compressor, and avoiding the failure to detect vibrations at certain operating frequencies due to insufficient frequency response range of the piezoelectric sensor.

[0060] In a specific example, the housing of the cabinet air conditioner and the area on the side wall of the cabinet where the piezoelectric sensor is installed should be flat. If there are uneven areas, rigid shims can be set between the piezoelectric sensor and the housing of the cabinet air conditioner, and between the piezoelectric sensor and the side wall of the cabinet, so that both force-bearing surfaces of the piezoelectric sensor can be evenly fitted with their adjacent structural components to avoid distortion of the pulse electrical signal due to uneven force.

[0061] Considering that the rack air conditioner may be used in outdoor racks or other environments with large temperature variations, in a specific example, the piezoelectric sensor can be made of a piezoelectric material with a high Curie temperature and a piezoelectric constant that changes little with temperature, so as to ensure that the correspondence between the pulse electrical signal output by the piezoelectric sensor and the vibration acceleration of the rack air conditioner remains stable throughout the entire operating temperature range of the rack air conditioner.

[0062] In one embodiment, the first vibration threshold is a critical amplitude obtained by conducting a resonance-induced test in a simulated installation environment, and the second vibration threshold is a critical displacement limit obtained by conducting a resonance-induced test in a simulated installation environment.

[0063] In this embodiment, both the first vibration threshold and the second vibration threshold are predetermined values ​​measured and stored during the research and development phase before the cabinet air conditioner leaves the factory. Specifically, the first vibration threshold is a critical amplitude obtained in advance through resonance-induced testing under a simulated installation environment, denoted as A0; the second vibration threshold is a critical displacement limit obtained in advance through resonance-induced testing under a simulated installation environment, denoted as L0.

[0064] The simulated installation environment referred to in this embodiment of the invention refers to a test environment built according to the installation state of the rack air conditioner in actual use. In this test environment, the model and specifications of the rack, the fixing method and fastening torque between the rack air conditioner and the rack, the installation position of the rack air conditioner on the rack, and the load configuration inside the rack are all consistent with the state of the rack air conditioner in actual use, so that the values ​​measured in the simulated installation environment can reflect the vibration of the rack air conditioner in actual use.

[0065] The resonance-induced test referred to in this embodiment of the invention refers to the test process in which the compressor of the cabinet air conditioner is operated point by point within its adjustable frequency range under the simulated installation environment to artificially induce resonance between the cabinet air conditioner and the cabinet, and the outputs of the vibration sensor and the displacement sensor are recorded when resonance occurs.

[0066] In a specific example, the resonance-induced test can be performed as follows: the operating frequency of the compressor is gradually increased from the lower limit of its adjustable frequency range to the upper limit of the adjustable frequency range in steps of 1 Hz, and the compressor is kept running for 60 seconds at each frequency point; during this process, the amplitude of the waveform output by the vibration sensor and the amplitude of the signal output by the displacement sensor are recorded simultaneously, and the operation of the cabinet air conditioner and the cabinet are observed at the same time; when obvious noise or abnormal vibration is observed between the cabinet air conditioner and the cabinet, the amplitude of the waveform output by the vibration sensor at that moment is recorded as the critical amplitude A0, and the amplitude of the signal output by the displacement sensor at that moment is recorded as the critical displacement limit L0.

[0067] In a specific example, the aforementioned noticeable noise can be judged by a sound pressure level measured one meter away from the cabinet that is 6 dB higher than when the cabinet's air conditioner is operating normally; the aforementioned abnormal vibration can be judged by visible shaking of the cabinet body or periodic impacts between the cabinet door and the cabinet body. To improve the reliability of the measured values, the resonance-induced test can be repeated multiple times, and the average value obtained from multiple tests is taken as the final critical amplitude A0 and critical displacement limit L0.

[0068] Therefore, the first vibration threshold A0 corresponds to the critical level of vibration acceleration when the rack air conditioner is about to or has already experienced significant resonance with the rack; the second vibration threshold L0 corresponds to the critical level of displacement of the rack air conditioner relative to the rack under the same conditions. The values ​​of the first and second vibration thresholds determined in the above manner are derived from test conditions consistent with the actual installation state. Therefore, when the rack air conditioner is actually running, the judgment results based on these two thresholds have good consistency with the actual vibration state of the rack air conditioner. It avoids the situation where resonance that has already occurred is not identified due to excessively high threshold values, and also avoids the situation where a normal operating state is judged as a resonance condition due to excessively low threshold values.

[0069] It should be noted that different models of rack air conditioners have different compressor excitation characteristics, and different rack specifications have different natural frequencies. Therefore, the first vibration threshold A0 and the second vibration threshold L0 need to be measured separately for the specific combination of the rack air conditioner and the rack. In a specific example, for a combination of a certain model of rack air conditioner and a certain specification of rack, if the first vibration threshold A0 is 2.5V and the second vibration threshold L0 is 0.8mm as measured by the resonance induced test, these values ​​are written into the memory of the main control unit MCU before the rack air conditioner leaves the factory, for the rack air conditioner to call during actual operation.

[0070] In a specific example, when the installation environment of the cabinet air conditioner changes, for example, when the cabinet air conditioner is modified to a cabinet of another specification, the resonance-induced test can be re-performed in the new simulated installation environment, and the newly measured critical amplitude and critical displacement limit values ​​can be written into the memory of the main control unit MCU to replace the original first vibration threshold and second vibration threshold, so that the vibration isolation method can still accurately identify the resonance condition after the installation state of the cabinet air conditioner changes.

[0071] In a specific example, in addition to performing a frequency upscan in the order from the lower limit to the upper limit, the resonance-induced test can also perform a frequency downscan in the order from the upper limit to the lower limit, and compare the values ​​recorded by the frequency upscan and the frequency downscan; if there is a difference between the critical amplitude and critical displacement limits recorded by the two scans, the smaller value is taken as the first vibration threshold A0 and the second vibration threshold L0, respectively, so that the vibration avoidance method can identify the resonance when it is still in the early stage of formation.

[0072] In a specific example, the results of the resonance-induced test can be recorded as a test data table in the form of "compressor operating frequency - vibration sensor output waveform amplitude - displacement sensor output signal amplitude - whether obvious noise or abnormal vibration occurs". The first vibration threshold A0 and the second vibration threshold L0 are read from the record row in the test data table where obvious noise or abnormal vibration first occurs. The test data table can also serve as the basis for subsequently determining the resonance frequency distribution of the compressor.

[0073] It should be noted that the first vibration threshold A0 and the second vibration threshold L0 correspond to the amplitude V1 of the acceleration signal and the amplitude V2 of the displacement signal, respectively. The first vibration threshold A0 and the amplitude V1 of the acceleration signal are both measured by the voltage value of the time-voltage waveform output by the vibration sensor, while the second vibration threshold L0 and the amplitude V2 of the displacement signal are both measured by the displacement of the cabinet air conditioner relative to the cabinet.

[0074] In step S102, the main control unit MCU performs the first-level logic judgment on the cabinet air conditioner, namely preliminary vibration screening. Specifically, the main control unit MCU detects and extracts the amplitude V1 of the acceleration signal, and compares the amplitude V1 with the preset first vibration threshold A0 to preliminarily determine whether the current vibration energy of the cabinet air conditioner has reached a level that may cause resonance.

[0075] When the amplitude V1 of the acceleration signal does not exceed the first vibration threshold A0, it indicates that the current vibration energy of the rack air conditioner is within a safe range. This vibration energy is insufficient to cause fatigue of the structural components of the rack air conditioner and the rack. Therefore, it is determined that the rack air conditioner is in normal operation and there is no resonance between it and the rack. At this time, the main control unit MCU no longer performs subsequent resonance condition determination and frequency adjustment. The compressor continues to operate at its current frequency, and the main control unit MCU returns to continue collecting and comparing the amplitude V1 of the acceleration signal.

[0076] When the peak value of the acceleration signal V1 exceeds the first vibration threshold A0, it indicates that the current vibration energy of the cabinet air conditioner has exceeded the above-mentioned safety range. The operation of the cabinet air conditioner at the current operating frequency may resonate with the cabinet. Based on this, it is determined that the cabinet air conditioner is in a suspected resonance condition.

[0077] In this embodiment of the invention, the "suspected resonance condition" refers to an intermediate state where the vibration energy of the cabinet air conditioner has reached a level that may trigger resonance, but it cannot yet be confirmed whether the vibration has been transmitted to the cabinet with sufficient amplitude. This state is classified as a suspected resonance condition rather than a direct resonance condition because the amplitude V1 of the acceleration signal alone is insufficient to determine the extent of the resonance's impact on the cabinet's interior. Therefore, further analysis is needed, combining this with the amplitude V2 of the displacement signal output by the displacement sensor, i.e., step S103 needs to be executed.

[0078] In a specific example, if the first vibration threshold A0 is calibrated to 2.5V, then when the amplitude V1 of the acceleration signal extracted by the main control unit MCU within a certain data window is 1.8V, since 1.8V does not exceed 2.5V, the main control unit MCU determines that the cabinet air conditioner is in normal operation and no resonance occurs; when the amplitude V1 of the acceleration signal extracted by the main control unit MCU within a certain data window is 3.2V, since 3.2V exceeds 2.5V, the main control unit MCU determines that the cabinet air conditioner is in a suspected resonance condition and proceeds to step S103.

[0079] The amplitude V1 of the acceleration signal is used as the basis for the first-level logic judgment because: the acceleration signal directly reflects the magnitude of the vibration energy of the air conditioner rack, and its response to changes in vibration state is relatively rapid, allowing it to react before the vibration of the air conditioner rack develops into a large-scale relative motion; at the same time, the first-level logic judgment only involves the amplitude comparison of one signal, resulting in a small computational load on the main control unit MCU, which can be executed continuously at a high frequency, thereby achieving continuous monitoring of the vibration state of the air conditioner rack. During most of the operating time when the amplitude V1 does not exceed the first vibration threshold A0, the main control unit MCU does not need to perform further analysis of the displacement signal, thus reducing the computational burden on the main control unit MCU.

[0080] In a specific example, to avoid misjudgment due to occasional single impacts, the main control unit (MCU) can determine that the cabinet air conditioner is in a suspected resonance condition only when the amplitude V1 of the acceleration signal exceeds the first vibration threshold A0 in multiple consecutive data windows. For example, if the amplitude V1 extracted by the main control unit (MCU) exceeds the first vibration threshold A0 in three consecutive data windows, the main control unit (MCU) determines that the cabinet air conditioner is in a suspected resonance condition; if the amplitude V1 in any of the three consecutive data windows does not exceed the first vibration threshold A0, the main control unit (MCU) restarts counting.

[0081] In a specific example, when the main control unit (MCU) determines that the cabinet air conditioner is in a suspected resonance condition, it can also temporarily store the amplitude V1 of the acceleration signal corresponding to the current determination and the current operating frequency of the compressor, so as to call them in subsequent steps when analyzing the vibration state of the cabinet air conditioner.

[0082] In one specific example, the amplitude V1 of the acceleration signal can be taken as the peak value of the time-voltage waveform within a data window, that is, the maximum voltage value reached by the time-voltage waveform within the data window; in another specific example, the amplitude V1 of the acceleration signal can also be taken as half of the peak value of the time-voltage waveform within a data window, as long as the first vibration threshold A0 is taken in the same way in the aforementioned resonance-induced test.

[0083] Therefore, step S102 in the vibration damping method distinguishes the operating state of the cabinet air conditioner into two categories: one is the normal operating state where the amplitude V1 of the acceleration signal does not exceed the first vibration threshold A0, in which case the vibration damping method does not intervene; the other is the suspected resonance condition where the amplitude V1 of the acceleration signal exceeds the first vibration threshold A0, in which case the vibration damping method proceeds to step S103 for further confirmation. This distinction ensures that the vibration damping method only triggers subsequent judgments and adjustments when necessary, without interfering with the normal operation of the cabinet air conditioner.

[0084] In step S103, the main control unit MCU performs a second-level logic judgment on the cabinet air conditioner, namely resonance verification. Specifically, if the cabinet air conditioner has been determined to be in a suspected resonance condition, the main control unit MCU collects the displacement signal output by the displacement sensor, extracts the amplitude V2 of the displacement signal, and compares the amplitude V2 with a preset second vibration threshold L0 to confirm whether resonance has indeed occurred between the cabinet air conditioner and the cabinet.

[0085] When the amplitude V2 of the displacement signal does not exceed the second vibration threshold L0, it indicates that although the cabinet air conditioner has a large vibration energy, its displacement relative to the cabinet is still at a small level. This situation is usually due to local vibrations inside the cabinet air conditioner unit, such as local vibrations of a certain refrigeration pipe, sheet metal part, or fan cover inside the cabinet air conditioner. This local vibration is insufficient to be transmitted to the overall structure formed by the cabinet air conditioner and the cabinet. Therefore, the main control unit MCU determines that the influence of the vibration can be ignored, and the cabinet air conditioner is not in a resonance condition. At this time, the compressor continues to operate at the current operating frequency, and the main control unit MCU returns to continue executing steps S101 and S102.

[0086] When the main control unit MCU measures that the amplitude V2 of the displacement signal exceeds the second vibration threshold L0, it indicates that the vibration of the rack air conditioner has been transmitted to the rack with sufficient amplitude, and a significant relative motion has been formed between the rack air conditioner and the rack. Based on this, the main control unit MCU determines that the rack air conditioner is currently resonating, i.e., in a resonance condition. If the resonance condition continues, it will have a serious impact on the components inside the rack. Therefore, it is necessary to adjust the operating frequency of the compressor of the rack air conditioner to avoid the frequency point that causes resonance, i.e., it is necessary to continue executing step S104.

[0087] In a specific example, if the second vibration threshold L0 is calibrated to 0.8 mm, then when the cabinet air conditioner is determined to be in a suspected resonance condition and the amplitude V2 of the displacement signal extracted by the main control unit MCU is 0.5 mm, since 0.5 mm does not exceed 0.8 mm, the main control unit MCU determines that the vibration effect of the cabinet air conditioner can be ignored; when the amplitude V2 of the displacement signal extracted by the main control unit MCU is 1.2 mm, since 1.2 mm exceeds 0.8 mm, the main control unit MCU determines that the cabinet air conditioner is in a resonance condition and proceeds to step S104.

[0088] It should be noted that the order of the first-level and second-level logical judgments mentioned above cannot be reversed, and both judgment conditions must be met simultaneously to determine that the cabinet air conditioner is in a resonance condition. If the main control unit MCU only detects that the amplitude V2 of the displacement signal exceeds the second vibration threshold L0, while the amplitude V1 of the acceleration signal does not exceed the first vibration threshold A0, then the main control unit MCU also cannot determine that the cabinet air conditioner is in resonance. This is because this situation is not caused by the continuous operation of the compressor, but may be caused by the cabinet air conditioner being in standby mode and detecting external bumps, vibrations, or other impacts during transportation. Although the aforementioned external impacts can cause a large relative displacement between the cabinet air conditioner and the cabinet, they are not accompanied by the periodic vibration energy generated by the continuous operation of the compressor. Therefore, the amplitude V1 of the acceleration signal will not exceed the first vibration threshold A0. If the cabinet air conditioner is determined to be in a resonance condition and the operating frequency of the compressor is adjusted in this case, it will not only fail to eliminate the vibration, but will also cause the compressor to deviate from the operating frequency that matches the internal heat load of the cabinet.

[0089] Therefore, the amplitude V1 of the acceleration signal and the amplitude V2 of the displacement signal characterize the vibration state of the cabinet air conditioner from two dimensions: vibration energy and relative displacement, respectively. These two parameters constitute a two-level progressive judgment condition: the first-level logic judgment filters out abnormal vibration energy conditions, and the second-level logic judgment further confirms whether the abnormal vibration energy has been transmitted to the cabinet in the form of significant relative displacement. Only when both of the above judgment conditions are met does the main control unit (MCU) determine that the cabinet air conditioner is in a resonance condition and execute subsequent frequency adjustments, thus ensuring high accuracy in determining the resonance condition.

[0090] In a specific example, when the main control unit (MCU) determines that the cabinet air conditioner is in a resonance condition, it can also output a corresponding status indicator through the display panel or communication interface of the cabinet air conditioner so that operation and maintenance personnel can understand that the cabinet air conditioner is currently in a vibration isolation process.

[0091] In a specific example, similar to the processing method in step S102, the main control unit MCU can also determine that the cabinet air conditioner is in resonance condition only when the amplitude V2 of the displacement signal exceeds the second vibration threshold L0 in multiple consecutive data windows, so as to further reduce the possibility of misjudgment caused by occasional displacement fluctuations.

[0092] In a specific example, the amplitude V2 of the displacement signal can be taken as half the difference between the maximum and minimum values ​​of the relative displacement corresponding to the electrical signal output by the displacement sensor within a data window, that is, the single-sided amplitude of the cabinet air conditioner when it reciprocates relative to the cabinet; the second vibration threshold L0 is also taken in the same way in the aforementioned resonance-induced test to ensure that the two are comparable.

[0093] It should be noted that the localized vibration inside the cabinet air conditioning unit described in step S103 is characterized by the vibration being confined to the internal structure of the cabinet air conditioning unit, with the housing of the cabinet air conditioning unit as a whole experiencing only a small displacement relative to the cabinet. Although this type of vibration can increase the amplitude V1 of the acceleration signal output by the vibration sensor, it does not create significant relative motion between the cabinet air conditioning unit and the cabinet, and therefore will not affect the components inside the cabinet, nor does it require adjustment of the compressor's operating frequency.

[0094] In step S104, when the cabinet air conditioner is determined to be in a resonance condition, the main control unit MCU adjusts the current operating frequency of the compressor upward or downward according to a preset frequency adjustment amount, so that the excitation frequency generated by the compressor deviates from the frequency point that causes resonance. The preset frequency adjustment amount is denoted as frequency modulation bandwidth ΔP in this embodiment of the invention.

[0095] The frequency modulation bandwidth ΔP is the minimum difference between the operating frequency of the compressor of the rack air conditioner when it resonates and when it does not resonate, as measured previously. In other words, the frequency modulation bandwidth ΔP represents the minimum frequency change required to make the compressor's operating frequency move away from the resonant range. Taking the frequency adjustment amount as the aforementioned minimum difference ensures that a single adjustment can potentially move the compressor's operating frequency away from the current resonant range, while avoiding excessive deviation of the compressor's operating frequency from the frequency matching the current heat load inside the rack due to excessively large single adjustments. This balances vibration damping effect and the cooling performance of the rack air conditioner.

[0096] In a specific example, the frequency modulation bandwidth ΔP is determined as follows: Under the aforementioned simulated installation environment, all resonant frequency points and all non-resonant frequency points of the compressor are recorded during its adjustable frequency range. The difference between each resonant frequency point and its adjacent non-resonant frequency point is calculated, and the minimum value among all such differences is taken as the frequency modulation bandwidth ΔP. For example, if the compressor is found to resonate at an operating frequency of 70Hz but not at an operating frequency of 75Hz, and this 5Hz difference is the minimum among all such differences, then the frequency modulation bandwidth ΔP is taken as 5Hz.

[0097] The main control unit (MCU) adjusts the compressor's operating frequency upwards or downwards based on the current operating frequency of the compressor and the frequency modulation bandwidth ΔP. In one specific example, the MCU may preferentially choose to adjust upwards, meaning the adjusted operating frequency is the sum of the current operating frequency and the frequency modulation bandwidth ΔP. When the sum of the current operating frequency and the frequency modulation bandwidth ΔP exceeds the upper limit of the compressor's adjustable frequency range, the MCU will choose to adjust downwards, meaning the adjusted operating frequency is the difference between the current operating frequency and the frequency modulation bandwidth ΔP. In another specific example, the MCU may also select the adjustment direction based on the current heat load inside the cabinet. When the heat load inside the cabinet is high, it will adjust upwards to increase cooling capacity; when the heat load inside the cabinet is low, it will adjust downwards to reduce operating power consumption.

[0098] In a specific example, if the adjustable frequency range of the compressor of a certain type of cabinet air conditioner is 30Hz to 120Hz, and the frequency modulation bandwidth ΔP is calibrated to 5Hz, and the current operating frequency of the compressor is 70Hz when the cabinet air conditioner is determined to be in resonance condition, then the main control unit MCU can adjust the operating frequency of the compressor from 70Hz to 75Hz; if the current operating frequency of the compressor is 118Hz, since the sum of 118Hz and 5Hz is 123Hz, which exceeds the upper limit of the adjustable frequency range of 120Hz, then the main control unit MCU will adjust the operating frequency of the compressor from 118Hz to 113Hz.

[0099] The reason why the aforementioned frequency adjustment can remove the rack-mounted air conditioner from the resonance condition is that the resonance between the air conditioner and the rack originates from the fact that the excitation frequency generated by the compressor at a specific operating frequency is close to the natural frequency of the rack. The natural frequency of the rack is determined by its structure and materials and does not change during the operation of the air conditioner, while the operating frequency of the compressor can be actively adjusted by the main control unit (MCU). Therefore, by adjusting the frequency modulation bandwidth ΔP upward or downward of the compressor's operating frequency, a sufficient gap is created between the excitation frequency generated by the compressor and the natural frequency of the rack, thus significantly reducing the vibration amplitude between the air conditioner and the rack, thereby removing the resonance condition.

[0100] Furthermore, during the process of the main control unit (MCU) adjusting the operating frequency of the compressor, the MCU limits the acceleration and deceleration rate of the compressor. That is, the change in the compressor's operating frequency from the initial value to the adjusted value proceeds smoothly with a preset slope, rather than abruptly. In a specific example, if the MCU limits the compressor's acceleration and deceleration rate to 1 Hz per second, the process of adjusting the compressor's operating frequency from 70 Hz to 75 Hz will be completed in 5 seconds. By limiting the compressor's acceleration and deceleration rate, large impact loads can be avoided on the compressor's crankshaft, connecting rods, and other moving parts, as well as the cooling piping system of the cabinet air conditioner, due to rapid changes in operating frequency. This prevents mechanical damage to the cabinet air conditioner during vibration damping.

[0101] In a specific example, the main control unit (MCU) adjusts the operating frequency of the compressor by outputting a frequency control command to the compressor's drive circuit. The drive circuit changes the frequency of the AC power it outputs to the compressor according to the frequency control command, thereby changing the compressor's rotational speed and the excitation frequency generated by the compressor.

[0102] In a specific example, after the main control unit (MCU) completes the adjustment of the compressor's operating frequency, it can record the operating frequency before adjustment, the operating frequency after adjustment, and the time of this adjustment, so as to query the execution status of the vibration isolation process during the operation and maintenance of the cabinet air conditioner.

[0103] It should be noted that since the frequency modulation bandwidth ΔP is taken from the minimum difference between the operating frequency of the compressor when it resonates and the operating frequency when it does not resonate, its value is usually much smaller than the width of the adjustable frequency range of the compressor. Therefore, the adjustment of the operating frequency of the compressor according to the frequency modulation bandwidth ΔP has a relatively limited impact on the cooling capacity of the cabinet air conditioner. After the frequency adjustment is completed, the cabinet air conditioner can still meet the heat dissipation requirements inside the cabinet at its adjusted operating frequency.

[0104] Combination Figure 5 As shown, in one embodiment, the vibration damping method of the cabinet air conditioner further includes: When the cabinet air conditioner is in resonance mode, the current operating frequency of the compressor of the cabinet air conditioner is recorded as the shielding frequency; The shielding frequency is written into the run register, and the shielding frequency stored in the run register is shielded during subsequent operation.

[0105] In this embodiment, when the rack air conditioner is determined to be in a resonance condition, the main control unit (MCU) records the current operating frequency of the rack air conditioner's compressor as a shielding frequency before adjusting the compressor's operating frequency. This shielding frequency is denoted as P-alarm in this embodiment. The shielding frequency P-alarm is the operating frequency of the compressor that caused this resonance.

[0106] The main control unit (MCU) writes the shielding frequency P alarm into the operation register. In this embodiment of the invention, the operation register refers to a storage unit within the main control unit (MCU) used to store the compressor's operating control parameters. When the compressor adjusts its frequency during operation, the main control unit (MCU) needs to read the parameters stored in this operation register to determine the allocated operating frequency.

[0107] After the shielded frequency P is written into the operating register, when the compressor adjusts its frequency during subsequent operation, the main control unit (MCU) shields the shielded frequency P stored in the operating register. That is, when the MCU allocates an operating frequency to the compressor based on changes in the internal heat load of the cabinet, it excludes the shielded frequency P from the available operating frequencies, preventing the compressor from operating stably at the shielded frequency P. In a specific example, when the compressor's operating frequency needs to increase from 60Hz to 80Hz, and the shielded frequency P is 70Hz, the MCU controls the compressor's operating frequency to increase directly to 80Hz without pausing after reaching 70Hz.

[0108] In a specific example, the operating register can store multiple shielding frequencies. Each time the main control unit (MCU) determines a resonance condition, it appends and records the compressor's operating frequency as a new shielding frequency and writes it into the operating register. This creates a resonance frequency record table for the cabinet air conditioner in its current installation state within the operating register. When the compressor adjusts its frequency during subsequent operation, the MCU shields all the shielding frequencies stored in the resonance frequency record table. For example, if a cabinet air conditioner is determined to be in a resonance condition at both 70Hz and 95Hz operating frequencies, the operating register will record the shielding frequencies of 70Hz and 95Hz sequentially. Subsequently, when the compressor adjusts its frequency within the adjustable frequency range of 30Hz to 120Hz, the operating frequency allocated by the MCU will not be either 70Hz or 95Hz.

[0109] In a specific example, the running register can be a storage unit with power-off retention capability, so that the shielding frequency P can still be retained after the cabinet air conditioner is powered off. Thus, when the cabinet air conditioner is turned on again, the main control unit MCU can directly shield the shielding frequency without having to go through resonance again.

[0110] By recording and shielding the aforementioned shielding frequencies, the cabinet air conditioner has the ability to remember the operating frequencies that have already resonated: after the vibration isolation process is completed, even if the heat load inside the cabinet changes and the operating frequency of the compressor needs to be readjusted, the compressor will not run to the shielding frequency P again, thereby avoiding repeated resonance and repeated triggering of the vibration isolation process at the same operating frequency, reducing the number of times the compressor's operating frequency is adjusted, and shortening the cumulative time that the cabinet air conditioner is in resonance condition.

[0111] In a specific example, before writing the shielding frequency P_alarm into the running register, the main control unit MCU can first query the existing shielding frequencies in the running register: if there is already a record in the running register that is the same as the shielding frequency to be written, then it will not be written again; if there is no record, then the shielding frequency P_alarm will be appended and written, thereby avoiding duplicate records in the running register.

[0112] In a specific example, when the installation status of the cabinet air conditioner changes, such as when the cabinet air conditioner is disassembled and reassembled or when the load configuration inside the cabinet changes significantly, the inherent frequency of the cabinet may change accordingly, and the original shielding frequency will no longer correspond to the actual resonant frequency. At this time, all the shielding frequencies stored in the operating register can be cleared through the operation panel of the cabinet air conditioner, so that the cabinet air conditioner can re-record its shielding frequency in the new installation status.

[0113] Combination Figure 6 As shown, in one embodiment, the vibration damping method of the cabinet air conditioner further includes: The compressor of the cabinet air conditioner is controlled to run continuously at the adjusted operating frequency for a preset time, and the resonance condition judgment continues. If the cabinet air conditioner is still determined to be in resonance condition, the operating frequency will be readjusted until it is determined that the cabinet air conditioner is no longer in resonance condition.

[0114] In this embodiment, after the main control unit MCU adjusts the operating frequency of the compressor according to the frequency adjustment amount, the main control unit MCU controls the compressor of the cabinet air conditioner to run continuously at the adjusted operating frequency for a preset duration, which is denoted as T in this embodiment of the invention. Within the preset duration T, the resonance condition judgment continues, that is, the aforementioned steps S101 to S103 are continued to be executed.

[0115] The purpose of setting the preset duration T is that after the compressor's operating frequency changes, the vibration state of the structural system formed by the cabinet air conditioner and the cabinet needs a certain period of time to stabilize. If the vibration state is judged immediately after the compressor's operating frequency is adjusted, the judgment result is easily affected by the transitional vibration during the frequency adjustment process, thus losing its representativeness. In a specific example, the preset duration T can be 30 seconds; in another specific example, the preset duration T can also be taken in the range of 10 to 60 seconds, depending on the specific model of the cabinet air conditioner.

[0116] Within the preset duration T, the main control unit (MCU) continuously monitors the vibration of the rack air conditioner. If, within the preset duration T, the amplitude V1 of the acceleration signal exceeds the first vibration threshold A0, and the amplitude V2 of the displacement signal also exceeds the second vibration threshold L0, it is determined that the rack air conditioner still resonates at the adjusted operating frequency, i.e., the rack air conditioner is still considered to be in a resonant operating condition. At this time, the main control unit (MCU) readjusts the operating frequency of the compressor.

[0117] The main control unit (MCU) repeatedly executes the process of "adjusting the operating frequency - running continuously at the adjusted operating frequency for a preset duration T - judging the resonance condition" until it is determined that the cabinet air conditioner is not in a resonance condition. If the amplitude V1 and amplitude V2 are not detected to exceed the corresponding limits within the preset duration T, it is considered that the adjusted operating frequency can prevent the cabinet air conditioner from resonance. At this time, the compressor continues to run at this operating frequency, and the main control unit (MCU) exits the current vibration avoidance process until the cabinet air conditioner is detected to be in a resonance condition again, at which point the vibration avoidance process is restarted.

[0118] In a specific example, after the compressor's operating frequency is adjusted from 70Hz to 75Hz, the main control unit (MCU) controls the compressor to run continuously at 75Hz for 30 seconds. If, within these 30 seconds, the MCU detects that the amplitude V1 of the acceleration signal is 3.1V, exceeding the 2.5V specified by the first vibration threshold A0, and the amplitude V2 of the displacement signal is 1.0mm, exceeding the 0.8mm specified by the second vibration threshold L0, then the MCU determines that the cabinet air conditioner is still in resonance mode at the 75Hz operating frequency and readjusts the compressor's operating frequency. If, within these 30 seconds, the amplitude V1 never exceeds 2.5V, or the amplitude V2 never exceeds 0.8mm, then the MCU determines that the cabinet air conditioner has escaped resonance mode, and the compressor continues to operate at 75Hz.

[0119] Through the above closed-loop re-judgment and readjustment process, the vibration isolation method does not take the elimination of resonance by a single frequency adjustment as a premise. Instead, it takes the actual vibration state of the cabinet air conditioner as the criterion for whether the vibration isolation is successful, and successively approaches the operating frequency that can make the cabinet air conditioner avoid resonance, thereby improving the adaptability of the vibration isolation method under different cabinet structures, different installation states and different load conditions.

[0120] It should be noted that the judgment logic for the resonance condition within the preset time period T is completely consistent with the judgment logic in steps S102 and S103. That is, whether the amplitude V1 of the acceleration signal exceeds the first vibration threshold A0 is still used as the judgment condition for suspected resonance condition, and whether the amplitude V2 of the displacement signal exceeds the second vibration threshold L0 is used as the judgment condition for resonance condition. Both conditions must be met simultaneously to determine that the cabinet air conditioner is still in resonance condition at the adjusted operating frequency.

[0121] In a specific example, the main control unit (MCU) collects and processes the acceleration signal and the displacement signal within the preset duration T according to the same sampling period and data window as in step S101. That is, the vibration state of the cabinet air conditioner is determined multiple times within the preset duration T. If any determination result indicates that the cabinet air conditioner is in a resonance condition, it is considered that the cabinet air conditioner still has resonance under the adjusted operating frequency. The main control unit (MCU) then readjusts the operating frequency of the compressor without waiting for the preset duration T to end.

[0122] In one embodiment, the readjustment of the operating frequency includes: The operating frequency can be adjusted by increasing the frequency adjustment amount or by adjusting it in the opposite direction.

[0123] In this embodiment, the readjustment of the operating frequency specifically involves adjusting the compressor's operating frequency by either increasing the frequency adjustment amount or by reversing the adjustment method. Increasing the frequency adjustment amount means that the frequency change used in the current adjustment is greater than the frequency change used in the previous adjustment; that is, while maintaining the adjustment direction, the operating frequency of the compressor is made to have a greater difference from the frequency point that triggers resonance. In a specific example, if the frequency adjustment amount used in the previous adjustment was the frequency modulation bandwidth ΔP, then the current adjustment can use twice the frequency modulation bandwidth ΔP, the next adjustment can use three times the frequency modulation bandwidth ΔP, and so on.

[0124] Reverse adjustment refers to an adjustment in the opposite direction to the previous adjustment. For example, if the previous adjustment increased the compressor's operating frequency, the current adjustment will decrease it; conversely, if the previous adjustment decreased it, the current adjustment will increase it. Reverse adjustment is suitable when the compressor's operating frequency remains within the resonance range after adjustment in one direction, but may escape the resonance range if adjusted in the opposite direction.

[0125] In a specific example, the frequency modulation bandwidth ΔP is 5Hz, and the compressor is determined to be in resonance mode at an operating frequency of 70Hz: The main control unit (MCU) first adjusts the compressor's operating frequency from 70Hz to 75Hz and maintains it for 30 seconds; if the cabinet air conditioner is still determined to be in resonance mode within these 30 seconds, the MCU increases the frequency adjustment by twice the frequency modulation bandwidth ΔP (10Hz), adjusting the compressor's operating frequency from 70Hz to 80Hz and maintaining it for 30 seconds; if the cabinet air conditioner is still determined to be in resonance mode within these 30 seconds, the MCU adjusts it in the opposite direction, decreasing the compressor's operating frequency from 70Hz to 65Hz and maintaining it for 30 seconds; this process is repeated until the cabinet air conditioner is no longer determined to be in resonance mode within the preset time period.

[0126] In another specific example, the main control unit (MCU) can also combine increasing the frequency adjustment amount with reverse adjustment, and search alternately to both sides of the frequency modulation bandwidth ΔP in the order of adjusting upward by one time, adjusting downward by one time, adjusting upward by two times, and adjusting downward by two times, so as to find the operating frequency that can make the cabinet air conditioner avoid resonance within a few adjustments.

[0127] In a specific example, during the process of readjusting the operating frequency of the compressor in the manner described above, the adjusted operating frequency is always limited to the adjustable frequency range of the compressor; when the operating frequency obtained by adjusting in a certain direction exceeds the boundary of the adjustable frequency range, the main control unit MCU changes to adjusting in the opposite direction.

[0128] By using the two methods described above to readjust the operating frequency of the compressor, the vibration isolation process still has a path to continue searching if a single adjustment fails. Increasing the frequency adjustment amount can cope with situations where the resonance range is wide, while reverse adjustment can cope with situations where adjacent resonance ranges are encountered when adjusting in the original direction. Together, they ensure that the operating frequency of the compressor can converge to a value that allows the cabinet air conditioner to avoid resonance.

[0129] In a specific example, during the process of readjusting the operating frequency of the compressor in the manner described above, each operating frequency that is determined to still be in resonance condition can be recorded as a new shielding frequency and written into the operating register in the aforementioned manner, so that the cabinet air conditioner can avoid all resonance frequencies encountered in this search process during subsequent operation.

[0130] In a specific example, during the process of readjusting the compressor's operating frequency in the manner described above, the main control unit (MCU) effectively limits the compressor's acceleration and deceleration rates. That is, each frequency adjustment is performed smoothly according to a preset slope to avoid mechanical damage to the cabinet air conditioner caused by repeated changes in the compressor's operating frequency during multiple adjustments.

[0131] This application constructs a dual-sensor detection system for multi-dimensional vibration detection of the rack-mounted air conditioner by installing a vibration sensor between the air conditioner and the rack, and a displacement sensor on the air conditioner. The main control unit (MCU) synchronously collects and analyzes the acceleration signal output by the vibration sensor and the displacement signal output by the displacement sensor. The amplitudes of the two signals are compared with a first vibration threshold and a second vibration threshold obtained in advance through resonance-induced testing in a simulated installation environment, forming a two-level progressive judgment logic. This enables online identification of resonance conditions during the operation of the rack-mounted air conditioner. When the rack-mounted air conditioner is determined to be in a resonance condition, the operating frequency of the compressor that caused the resonance is recorded and adjusted according to a preset frequency adjustment amount, so that the excitation frequency generated by the compressor deviates from the natural frequency of the rack, thereby removing the rack-mounted air conditioner from the resonance condition.

[0132] Therefore, this application solves the technical problem in the prior art that the cabinet air conditioner does not have the ability to identify the resonance condition between itself and the cabinet during operation, and therefore cannot actively avoid resonance by adjusting the operating frequency of the compressor. It shortens the duration of the cabinet air conditioner in the resonance condition, reduces the abnormal noise caused by resonance and the fatigue of the structural components of the cabinet air conditioner and the cabinet, reduces the impact of resonance on the internal components of the cabinet, and improves the operational stability of the cabinet air conditioner and the equipment inside the cabinet.

[0133] It should be noted that, as an alternative technical solution, only the displacement sensor can be used. This involves detecting only the displacement amplitude of the air conditioner relative to the cabinet during operation and comparing it with the second vibration threshold L0 to determine whether the air conditioner is in a resonance condition. However, with fewer sensors, the lack of a first-level logical judgment based on the amplitude of the acceleration signal may lead to misjudgments in the air conditioner's resonance detection. For example, when the air conditioner is in standby mode or subjected to external bumps or impacts during transportation, the displacement sensor will still output a displacement signal with an amplitude exceeding the second vibration threshold L0. If a judgment is made solely based on this displacement signal, the external impact may be misjudged as resonance of the air conditioner. Therefore, this embodiment of the invention uses both the vibration sensor and the displacement sensor to detect the vibration of the air conditioner, thereby improving the accuracy of the resonance condition determination.

[0134] It should also be noted that the specific values ​​of the first vibration threshold A0, the second vibration threshold L0, the average frequency P, the frequency modulation bandwidth ΔP, and the preset duration T given in the above embodiments are all exemplary descriptions. Those skilled in the art can calibrate and set the above parameters according to the specific model of the cabinet air conditioner, the specific specifications of the cabinet, and the actual installation status. Any technical solution that adopts the above two-level judgment logic and adjusts the operating frequency of the compressor accordingly falls within the protection scope of this invention.

[0135] To facilitate understanding, the following example illustrates the execution process of the vibration damping method. Assume a certain type of rack-mounted air conditioner is installed on a rack of a certain specification. Its compressor has an adjustable frequency range of 30Hz to 120Hz. After conducting resonance-induced tests in a simulated installation environment, the first vibration threshold A0 is calibrated to 2.5V, the second vibration threshold L0 to 0.8mm, the average frequency P to 45Hz, the frequency modulation bandwidth ΔP to 5Hz, and the preset duration T to 30 seconds. After the rack-mounted air conditioner is turned on, the main control unit (MCU) extracts the frequency P1 of the pulse electrical signal output by the vibration sensor, which is 52Hz. Since 52Hz is not lower than 45Hz, it determines that the rack-mounted air conditioner is in operation and proceeds to analyze and compare the acceleration and displacement signals.

[0136] As the heat load inside the cabinet increases, the operating frequency of the compressor is adjusted to 70Hz. At this time, the amplitude V1 of the acceleration signal extracted by the main control unit MCU in several consecutive data windows is 3.2V, which exceeds the 2.5V specified by the first vibration threshold A0. Based on this, it is determined that the cabinet air conditioner is in a suspected resonance condition. The main control unit MCU then extracts the amplitude V2 of the displacement signal, which is 1.2mm, exceeding the 0.8mm specified by the second vibration threshold L0. Based on this, it is determined that the cabinet air conditioner is in a resonance condition.

[0137] The main control unit (MCU) then records the compressor's current operating frequency of 70Hz as the shielding frequency P and writes it into the operation register. Then, according to the frequency modulation bandwidth ΔP, it adjusts the compressor's operating frequency from 70Hz to 75Hz. This adjustment process is completed smoothly over 5 seconds at an acceleration / deceleration rate of 1Hz per second. The compressor runs continuously at 75Hz for 30 seconds. During this period, the MCU continuously monitors the vibration of the cabinet air conditioner. The amplitude of the extracted acceleration signal V1 is 1.6V, and the amplitude of the displacement signal V2 is 0.3mm. Neither exceeds the corresponding threshold. Based on this, it is determined that the cabinet air conditioner has escaped the resonance condition, and the compressor continues to operate at 75Hz. The MCU exits this vibration isolation process. Afterward, even if the heat load inside the cabinet changes again, the MCU will no longer use the 70Hz shielding frequency recorded in the operation register when allocating the compressor's operating frequency.

[0138] Combination Figure 7 As shown, Figure 7 This is a schematic block diagram of a vibration damping device for a rack-mounted air conditioner according to an embodiment of the present invention. The rack-mounted air conditioner is installed on a rack, a vibration sensor is provided between the rack-mounted air conditioner and the rack, and a displacement sensor is provided on the rack-mounted air conditioner. The vibration damping device 700 includes: The signal acquisition unit 701 is used to acquire, through the vibration sensor, an acceleration signal characterizing the vibration acceleration of the cabinet air conditioner in operation, and through the displacement sensor, a displacement signal characterizing the displacement of the cabinet air conditioner relative to the cabinet. The first determination unit 702 is used to extract the amplitude of the acceleration signal and compare it with a preset first vibration threshold. When the amplitude of the acceleration signal exceeds the first vibration threshold, the cabinet air conditioner is determined to be in a suspected resonance condition. The second determination unit 703 is used to extract the amplitude of the displacement signal and compare it with a preset second vibration threshold when the cabinet air conditioner is in a suspected resonance condition. When the amplitude of the displacement signal exceeds the second vibration threshold, the cabinet air conditioner is determined to be in a resonance condition. The frequency adjustment unit 704 is used to adjust the current operating frequency of the compressor upward or downward according to a preset frequency adjustment amount when the cabinet air conditioner is in resonance condition.

[0139] In this embodiment, the signal acquisition unit 701 acquires an acceleration signal representing the vibration acceleration of the rack air conditioner during operation via the vibration sensor and a displacement signal representing the displacement of the rack air conditioner relative to the rack via the displacement sensor; the first determination unit 702 extracts the amplitude of the acceleration signal and compares it with a preset first vibration threshold. When the amplitude of the acceleration signal exceeds the first vibration threshold, the rack air conditioner is determined to be in a suspected resonance condition; the second determination unit 703, when the rack air conditioner is in a suspected resonance condition, extracts the amplitude of the displacement signal and compares it with a preset second vibration threshold. When the amplitude of the displacement signal exceeds the second vibration threshold, the rack air conditioner is determined to be in a resonance condition; the frequency adjustment unit 704, when the rack air conditioner is in a resonance condition, adjusts the current operating frequency of the compressor upward or downward according to a preset frequency adjustment amount.

[0140] In one embodiment, the vibration sensor is a piezoelectric sensor, and the vibration sensor is installed between the cabinet air conditioner and the side wall of the cabinet.

[0141] In one embodiment, the signal acquisition unit 701 is specifically used for: Extract the frequency of the acceleration signal collected by the vibration sensor and compare the frequency with a preset average frequency. When the frequency is lower than the average frequency, the cabinet air conditioner is determined to be in a non-operating state and enters a standby monitoring state. When the frequency is not lower than the average frequency, the cabinet air conditioner is determined to be in operation.

[0142] In one embodiment, the first vibration threshold is a critical amplitude obtained by conducting a resonance-induced test in a simulated installation environment, and the second vibration threshold is a critical displacement limit obtained by conducting a resonance-induced test in a simulated installation environment.

[0143] In one embodiment, the vibration damping device 700 of the cabinet air conditioner is further specifically used for: When the cabinet air conditioner is in resonance mode, the current operating frequency of the compressor of the cabinet air conditioner is recorded as the shielding frequency; The shielding frequency is written into the run register, and the shielding frequency stored in the run register is shielded during subsequent operation.

[0144] In one embodiment, the vibration damping device 700 of the cabinet air conditioner is further specifically used for: The compressor of the cabinet air conditioner is controlled to run continuously at the adjusted operating frequency for a preset time, and the resonance condition judgment continues. If the cabinet air conditioner is still determined to be in resonance condition, the operating frequency will be readjusted until it is determined that the cabinet air conditioner is no longer in resonance condition.

[0145] In one embodiment, the vibration damping device 700 of the cabinet air conditioner is further specifically used for: The operating frequency can be adjusted by increasing the frequency adjustment amount or by adjusting it in the opposite direction.

[0146] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0147] This invention also provides a vibration damping system for a cabinet air conditioner, including the vibration damping device for the cabinet air conditioner as described above.

[0148] This invention also provides a rack-mounted air conditioner, which may include a memory and a processor. The memory stores a computer program, and when the processor calls the computer program in the memory, it can implement the steps provided in the above embodiments. Of course, the computer device may also include various network interfaces, a power supply, a graphics card, etc., and the graphics card performance can be used to operate the model, such as for inference and training.

[0149] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0150] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A vibration damping method for a rack-mounted air conditioner, wherein the rack-mounted air conditioner is installed on a rack, characterized in that, A vibration sensor is installed between the rack air conditioner and the rack, and a displacement sensor is installed on the rack air conditioner. The vibration damping method includes: The vibration sensor acquires an acceleration signal characterizing the vibration acceleration of the cabinet air conditioner during operation, and the displacement sensor acquires a displacement signal characterizing the displacement of the cabinet air conditioner relative to the cabinet. The amplitude of the acceleration signal is extracted and compared with a preset first vibration threshold. When the amplitude of the acceleration signal exceeds the first vibration threshold, the cabinet air conditioner is determined to be in a suspected resonance condition. When the cabinet air conditioner is in a suspected resonance condition, the amplitude of the displacement signal is extracted and compared with a preset second vibration threshold. When the amplitude of the displacement signal exceeds the second vibration threshold, it is determined that the cabinet air conditioner is in a resonance condition. When the cabinet air conditioner is in resonance mode, the current operating frequency of the compressor of the cabinet air conditioner is recorded as the shielding frequency and written into the operation register. Then, according to the preset frequency adjustment amount, the current operating frequency of the compressor is adjusted up or down. In subsequent operation, when the compressor adjusts the frequency, the shielding frequency stored in the operation register is excluded from the operating frequencies available for the compressor to select. Wherein, the first vibration threshold is the critical amplitude obtained by conducting a resonance-induced test in a simulated installation environment in advance, and the second vibration threshold is the critical displacement limit obtained by conducting a resonance-induced test in a simulated installation environment in advance. The simulated installation environment is a test environment built according to the installation state of the cabinet air conditioner in actual use. The resonance-induced test is to run the compressor point by point within its adjustable frequency range in the simulated installation environment to induce resonance between the cabinet air conditioner and the cabinet. When obvious noise or abnormal vibration is observed between the cabinet air conditioner and the cabinet, the amplitude of the waveform output by the vibration sensor at that moment is recorded as the critical amplitude, and the amplitude of the signal output by the displacement sensor at that moment is recorded as the critical displacement limit.

2. The air conditioning vibration damping method according to claim 1, characterized in that, The vibration sensor is a piezoelectric sensor, and it is installed between the cabinet air conditioner and the side wall of the cabinet.

3. The air conditioning vibration damping method according to claim 1, characterized in that, Before the steps of acquiring the acceleration signal characterizing the vibration acceleration of the rack air conditioner under operating conditions via the vibration sensor and acquiring the displacement signal characterizing the displacement of the rack air conditioner relative to the rack via the displacement sensor, the procedure includes: Extract the frequency of the acceleration signal collected by the vibration sensor and compare the frequency with a preset average frequency. When the frequency is lower than the average frequency, the cabinet air conditioner is determined to be in a non-operating state and enters a standby monitoring state. When the frequency is not lower than the average frequency, the cabinet air conditioner is determined to be in operation.

4. The air conditioning vibration damping method according to claim 1, characterized in that, Also includes: The compressor of the cabinet air conditioner is controlled to run continuously at the adjusted operating frequency for a preset time, and the resonance condition judgment continues. If the cabinet air conditioner is still determined to be in resonance condition, the operating frequency is readjusted until it is determined that the cabinet air conditioner is no longer in resonance condition.

5. The air conditioning vibration damping method according to claim 4, characterized in that, The readjustment of the operating frequency includes: The operating frequency can be adjusted by increasing the frequency adjustment amount or by adjusting it in the opposite direction.

6. A vibration damping device for a rack-mounted air conditioner, wherein the rack-mounted air conditioner is installed on a rack, characterized in that, A vibration sensor is installed between the cabinet air conditioner and the cabinet, and a displacement sensor is installed on the cabinet air conditioner. The vibration damping device includes: The signal acquisition unit is used to acquire, through the vibration sensor, an acceleration signal characterizing the vibration acceleration of the cabinet air conditioner in operation, and through the displacement sensor, a displacement signal characterizing the displacement of the cabinet air conditioner relative to the cabinet. The first determination unit is used to extract the amplitude of the acceleration signal and compare it with a preset first vibration threshold. When the amplitude of the acceleration signal exceeds the first vibration threshold, the cabinet air conditioner is determined to be in a suspected resonance condition. The second determination unit is used to extract the amplitude of the displacement signal and compare it with a preset second vibration threshold when the cabinet air conditioner is in a suspected resonance condition. When the amplitude of the displacement signal exceeds the second vibration threshold, the cabinet air conditioner is determined to be in a resonance condition. The frequency adjustment unit is used to record the current operating frequency of the compressor of the cabinet air conditioner as a shielded frequency and write it into the operation register when the cabinet air conditioner is in resonance condition. Then, according to the preset frequency adjustment amount, the current operating frequency of the compressor is adjusted up or down. In subsequent operation, when the compressor adjusts the frequency, the shielded frequency stored in the operation register is excluded from the operating frequencies available for the compressor to select. Wherein, the first vibration threshold is the critical amplitude obtained by conducting a resonance-induced test in a simulated installation environment in advance, and the second vibration threshold is the critical displacement limit obtained by conducting a resonance-induced test in a simulated installation environment in advance. The simulated installation environment is a test environment built according to the installation state of the cabinet air conditioner in actual use. The resonance-induced test is to run the compressor point by point within its adjustable frequency range in the simulated installation environment to induce resonance between the cabinet air conditioner and the cabinet. When obvious noise or abnormal vibration is observed between the cabinet air conditioner and the cabinet, the amplitude of the waveform output by the vibration sensor at that moment is recorded as the critical amplitude, and the amplitude of the signal output by the displacement sensor at that moment is recorded as the critical displacement limit.

7. A vibration damping system for a cabinet air conditioner, characterized in that, Includes the vibration damping device for the cabinet air conditioner as described in claim 6.

8. A cabinet air conditioner, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the vibration damping method for a cabinet air conditioner as described in any one of claims 1 to 5.

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