Foreign matter particle detection system, method and equipment based on multi-frequency vibration and storage medium

Abstract

The embodiment of the invention relates to the technical field of foreign matter particle detection, and discloses a foreign matter particle detection system, method and equipment based on multi-frequency vibration and a storage medium, the system comprises a vibration excitation unit, at least one acoustic sensor, a signal processing unit and a data control processing terminal, and a to-be-detected product is fixed on the vibration excitation unit; the vibration excitation unit is used for generating broadband mechanical vibration; the acoustic sensor is arranged on the to-be-detected product and used for collecting acoustic signals generated by the to-be-detected product in the vibration process of the vibration excitation unit; the signal processing unit is electrically connected with the acoustic sensor and is used for performing signal analysis on the acoustic signal and outputting a signal analysis result; and the data control processing terminal is electrically connected with the signal processing unit and is used for judging whether foreign matter particles exist in the to-be-detected product or not according to the signal analysis result and outputting a detection result. In this way, the accuracy and efficiency of foreign matter particle detection can be improved.

Description

Technical Field

[0001] This invention relates to the field of foreign particle detection technology, specifically to a foreign particle detection system, method, device, and storage medium based on multi-frequency vibration. Background Technology

[0002] Foreign particle detection is mainly used in various processes such as product welding and assembly to detect foreign particles inside the product in advance. For example, in the military and aerospace fields, precision instruments may contain various tiny foreign particles such as loose screws and detached welding slag. In the communications field, foreign particles may be present in the metal cavities of duplexers and filters inside 5G base stations. In the field of new energy vehicles, IGBT modules in the power battery control system also require particle detection. If foreign particles are present inside the product, they will be activated and released when the product operates under conditions such as ultra-high acceleration or severe impact. These particles will then move randomly and erratically within the product's cavities, either suspending within the cavities or falling onto certain components, posing a significant threat to the product's reliability. Minor issues such as short circuits, pipe blockages, and jamming of moving parts can lead to serious quality accidents such as explosions. Currently, the technology for detecting foreign particles inside products suffers from low efficiency and low accuracy. The main technical shortcomings include the following: 1. Manual visual inspection: Using a standard lighting source of 1000 lux or higher, the interior of the product is manually observed through a high-magnification industrial endoscope, which requires damaging the product's sealing structure. This method is inefficient, prone to missed detections (more than 70% missed detection rate), and can only identify larger particles; it is difficult to detect particles smaller than 1 mm.

[0003] 2. X-ray fluoroscopic inspection: A 50-120kV X-ray source is used to penetrate the product. The attenuation signal is received by a flat panel detector, and a threshold segmentation algorithm is used to identify metal particles. Since the X-ray absorption rate of non-metallic materials (such as plastics and silicone) is close to that of air, an effective imaging contrast cannot be formed. Therefore, this method has extremely low imaging contrast for non-metallic materials (such as plastics and silicone) and cannot effectively identify them. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention provide a foreign particle detection system, method, device and storage medium based on multi-frequency vibration to solve the problems existing in the prior art.

[0005] According to one aspect of the present invention, a foreign particle detection system based on multi-frequency vibration is provided. The system includes a vibration excitation unit, at least one acoustic sensor, a signal processing unit, and a data control and processing terminal, wherein the product to be detected is fixed on the vibration excitation unit. The vibration excitation unit is used to generate broadband mechanical vibration; The acoustic sensor is mounted on the product under test and is used to collect the acoustic signals generated by the product under test during the vibration of the vibration excitation unit. The signal processing unit is electrically connected to the acoustic sensor and is used to perform signal analysis on the acoustic signal and output the signal analysis results. The data control and processing terminal is electrically connected to the signal processing unit and is used to determine whether there are foreign particles inside the product to be tested based on the signal analysis results, and output the detection results.

[0006] In one alternative embodiment, the acoustic sensor comprises a plurality of acoustic sensors, at least two of which are spaced apart on the product to be tested. The acoustic sensor is also used to collect acoustic signals generated at different positions of the product to be tested during the vibration of the vibration excitation unit. Each acoustic signal is transmitted to the signal processing unit through a separate channel. The signal processing unit is further configured to perform signal analysis on the acoustic signal of each of the channels respectively, and output the signal analysis result corresponding to each of the channels; The data control and processing terminal is also used to collaboratively determine whether there are foreign particles inside the product to be tested based on the signal analysis results of all the channels, and output the detection results.

[0007] In one alternative embodiment, the data control processing terminal includes a human-machine interface for displaying the signal analysis results and detection results for each of the channels. The data control and processing terminal is also electrically connected to the vibration excitation unit and the acoustic sensor. The human-machine interface is also used to receive vibration parameters set for the vibration excitation unit and sensing parameters set for the multiple acoustic sensors, so as to set the vibration parameters of the vibration excitation unit and the sensing parameters of the multiple acoustic sensors.

[0008] In one optional approach, the vibration parameters include at least the initial vibration frequency, the final vibration frequency, the vibration running time, the vibration running parameters, the running mode, and the number of runs. The data control processing terminal is also electrically connected to an external device, and the data control processing terminal exports the vibration parameters to the external device in response to the vibration parameter export command of the human-machine interface. The sensing parameters include at least channel identifier, sensitivity, signal-to-noise ratio, operating status, and position information of multiple acoustic sensors. The data control and processing terminal responds to the sensing parameter export command of the human-machine interface and exports the sensing parameters to the external device.

[0009] In one alternative embodiment, the data control and processing terminal is further configured to control the foreign particle detection process of the vibration excitation unit, the acoustic sensor, and the signal processing unit, respectively, and to generate a foreign particle detection report and display it on the human-machine interface.

[0010] In an optional embodiment, the data control processing terminal is further configured to determine whether foreign particles exist inside the product to be tested based on the signal analysis results and the ambient noise frequency band, and output the detection results: If the signal analysis results show signals in other frequency bands different from the ambient noise frequency band, then foreign particles are present inside the product to be tested. If the signal analysis results show only a frequency band that is the same as the ambient noise frequency band, then there are no foreign particles inside the product to be tested.

[0011] According to another aspect of the present invention, a method for detecting foreign particles based on multi-frequency vibration is provided. This method is executed based on the aforementioned multi-frequency vibration-based foreign particle detection system. The method includes: The product to be tested is fixed onto the vibration excitation unit; The vibration excitation unit is activated to generate broadband mechanical vibration; The acoustic sensor is activated to collect the acoustic signal generated by the product under test during the vibration of the vibration excitation unit. The signal processing unit is activated to perform signal analysis on the acoustic signal and output the signal analysis results. The data control and processing terminal determines whether there are foreign particles inside the product to be tested based on the signal analysis results, and outputs the detection results.

[0012] In one alternative approach, the acoustic sensor is activated after a preset time has elapsed since the vibration excitation unit was activated. When the acoustic sensors are activated, the acoustic sensors that are in complete contact with the product under test are activated, and the acoustic sensors that are not in complete contact with the product under test are deactivated.

[0013] According to another aspect of the present invention, a computer device is provided, comprising: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus; the memory is used to store at least one executable instruction, wherein the executable instruction causes the processor to perform operations performed by the signal processing unit and the data control processing terminal in the above system.

[0014] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the storage medium stores at least one executable instruction, which, when executed on a computer device, causes the computer device to perform the operations performed by the signal processing unit and the data control processing terminal in the above system.

[0015] This invention effectively excites foreign particles of different masses and materials within a product through broadband mechanical vibration, causing excess foreign particles to move and collide within the product. At least one acoustic sensor collects the acoustic signals generated by the product under test. After analyzing the acoustic signals, a data control processing terminal determines the presence of foreign particles inside the product based on the signal analysis results. This embodiment reduces the minimum detectable mass of foreign particles to 50mg through broadband vibration, increasing the detection accuracy to over 95%. It boasts high accuracy and a high degree of automation, significantly improving the efficiency of foreign particle detection.

[0016] The above description is merely an overview of the technical solutions of the embodiments of the present invention. In order to better understand the technical means of the embodiments of the present invention and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of an embodiment of the foreign particle detection system based on multi-frequency vibration of the present invention is shown; Figure 2 A schematic diagram of another embodiment of the foreign particle detection system based on multi-frequency vibration of the present invention is shown; Figure 3 A schematic diagram showing the signal analysis results of the human-computer interaction interface display channel and the detection results of the absence of foreign particles is shown. Figure 4 A schematic diagram showing the signal analysis results and the detection results of foreign particles displayed on the human-computer interaction interface is shown. Figure 5 This diagram illustrates how a human-computer interaction interface displays another signal analysis result and the detection result of foreign particles. Figure 6 A schematic diagram of another embodiment of the foreign particle detection system based on multi-frequency vibration of the present invention is shown; Figure 7 A schematic diagram showing the setting of vibration parameters in a human-computer interaction interface is shown; Figure 8A schematic diagram showing the setting of sensing parameters in a human-computer interaction interface is shown. Figure 9 A schematic diagram of the structure of a computer device provided in an embodiment of the present invention is shown. Detailed Implementation

[0018] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0019] Figure 1 A schematic diagram of the structure of the foreign particle detection system based on multi-frequency vibration according to an embodiment of the present invention is shown, as follows: Figure 1 As shown, the system includes a vibration excitation unit, at least one acoustic sensor, a signal processing unit, and a data control and processing terminal. The product to be tested is fixed on the vibration excitation unit. In one embodiment, the product to be tested can be fixed above the vibration excitation unit by a clamp, screw, or other fixing device.

[0020] The vibration excitation unit is used to generate broadband mechanical vibration. It can employ electromagnetic excitation to produce sinusoidal vibration in a vertical direction. Closed-loop control technology ensures that the amplitude remains constant at approximately 1.5mm when the unit is fully loaded (e.g., 50kg). The broadband frequency range is 5Hz-500Hz. During vibration, the frequency of the excitation unit continuously changes within this range, and the product under test vibrates accordingly. This broadband mechanical vibration effectively excites foreign particles of different masses and materials within the product, causing excess particles to displace within the product. This displacement is a random combination of sliding and impacting of the particles relative to the product shell, generating stress elastic waves and sound waves. These waves propagate within the product shell, forming a reverberant signal.

[0021] An acoustic sensor, mounted on the product under test, is used to collect the acoustic signals generated by the product during vibration of the vibration excitation unit. The acoustic sensor is a piezoelectric particle acoustic sensor that achieves acoustic-to-electric conversion. In one embodiment, the acoustic sensor is located at the bottom of the product, enabling effective collection of the product's acoustic signals. When foreign particles are present inside the product, the particles are excited, generating reverberation signals. These reverberation signals are transmitted to the acoustic sensor through the product structure. The acoustic sensor collects the acoustic signal formed by the ambient noise and the reverberation signal. When no foreign particles are present inside the product, the acoustic sensor collects the acoustic signal of only ambient noise.

[0022] Furthermore, such as Figure 2As shown, the acoustic sensor includes multiple acoustic sensors, at least two of which are spaced apart on the product to be tested. They are also used to collect acoustic signals generated at different positions of the product to be tested during the vibration of the vibration excitation unit. Each acoustic signal is transmitted to the signal processing unit through a separate channel.

[0023] In this embodiment, the choice of which acoustic sensors to use to collect the product's acoustic signals is determined based on the product's shape. Generally, the acoustic sensors are located at the bottom of the product, and multiple acoustic sensors can be evenly distributed in an array. Preferably, there can be nine evenly distributed acoustic sensors in an array. To accurately collect the acoustic signals generated by the product, acoustic sensors that are in complete contact with the bottom of the product can be used to collect the product's acoustic signals, while acoustic sensors that are in contact with or not in contact with the bottom of the product cannot be used to collect the product's acoustic signals because they are difficult to capture weak sound signals. This embodiment employs a multi-acoustic sensor acquisition and multi-channel signal transmission approach. Different acoustic sensors acquire acoustic signals generated at different locations on the product, ensuring that weak sound signals can be collected. Each acoustic signal is transmitted to the signal processing unit through a separate channel. The acoustic sensor has a center frequency of 50kHz, a dynamic range of 135dB, and a signal-to-noise ratio greater than 100dB, ensuring that reverberation signals can be acquired and will not be drowned out by mechanical noise, etc. Furthermore, each channel has high matching accuracy: amplitude ratio ±0.1dB and phase difference ±1.0°, thereby achieving high-quality signal acquisition of the location of foreign particles.

[0024] The signal processing unit, electrically connected to the acoustic sensor, is used to analyze the acoustic signal and output the signal analysis results. The reverberation signal is a weak acoustic signal. After receiving the acoustic signal, the signal processing unit amplifies it, applies anti-aliasing filtering to eliminate nonlinear phase distortion and aliasing, and performs high-precision sampling using an A / D converter (e.g., a 24-bit A / D converter). The signal analysis results are then extracted using digital signal processing algorithms (including FFT, wavelet transform, kurtosis, skewness, and envelope spectrum analysis). The signal analysis results include the time-domain (energy) and frequency-domain (spectral characteristics) information of the acoustic signal, and are output as a waveform graph.

[0025] Furthermore, the signal processing unit performs signal analysis on the acoustic signal of each channel and outputs the signal analysis results for each channel.

[0026] The data control and processing terminal is electrically connected to the signal processing unit. It is used to determine whether there are foreign particles inside the product to be tested based on the signal analysis results, and output the test results.

[0027] The data control and processing terminal analyzes the signal analysis results. If the signal analysis results only contain time-domain and frequency-domain features corresponding to environmental noise, it is determined that there are no foreign particles inside the product. If the signal analysis results include not only time-domain and frequency-domain features corresponding to environmental noise, but also other signal features that are significantly different from environmental noise, it is determined that there are foreign particles inside the product. The environmental noise refers to the noise generated by the vibration of the vibration excitation unit.

[0028] Furthermore, the data control and processing terminal is also used to collaboratively determine whether foreign particles exist inside the product under test based on the signal analysis results of all channels, and output the detection results. Each acoustic sensor can accurately collect its corresponding acoustic signal. Regardless of whether foreign particles exist inside the product, the collected acoustic signals should be essentially the same, without individual differences. If there are differences, it indicates an abnormality in the acoustic sensor or signal processing unit (the test can be repeated). Therefore, the signal analysis results corresponding to the acoustic signals of all channels should also be essentially the same. When the signal analysis results of all channels are the same, the data control and processing terminal performs the operation to determine whether foreign particles exist. This collaborative judgment method can improve the accuracy of detection.

[0029] Furthermore, the data control and processing terminal is also used to determine whether there are foreign particles inside the product under test based on the signal analysis results and the ambient noise frequency band, and output the detection results: If the signal analysis results show signals in other frequency bands different from the ambient noise frequency band, then foreign particles are present inside the product to be tested. If the signal analysis results show only a frequency band that is the same as the ambient noise frequency band, then there are no foreign particles inside the product to be tested.

[0030] Furthermore, the data control and processing terminal includes a human-machine interface, which is used to display the signal analysis results and detection results of each channel.

[0031] like Figure 3 As shown, acoustic signals are collected by four acoustic sensors. After signal analysis, the signals are input to the data control and processing terminal through four channels: CH1, CH2, CH3, and CH4. The data control and processing terminal analyzes the signals and finds that the signal analysis results are all the same. Moreover, only the frequency band that is the same as the frequency band of the ambient noise exists in the four signal analysis results. Therefore, it is determined that there are no foreign particles inside the product to be tested. The human-machine interface displays the signal analysis results of each channel and the detection result that there are no foreign particles.

[0032] like Figure 4 and Figure 5As shown, after analyzing the signal analysis results of the four channels, the data control processing terminal found that the signal analysis results were all the same, and that there were signals in other frequency bands different from the ambient noise frequency band in the signal analysis results, such as... Figure 4 There are other frequency bands that are significantly lower than the ambient noise frequency band, such as Figure 5 As shown, if there are signals in other frequency bands that are significantly higher than the ambient noise frequency band, it is determined that there are foreign particles inside the product under test. The human-machine interface displays the signal analysis results for each channel and the detection results of foreign particles.

[0033] Furthermore, such as Figure 6 As shown, the data control and processing terminal is also electrically connected to the vibration excitation unit and the acoustic sensors. The human-machine interface is also used to receive the vibration parameters set for the vibration excitation unit and the sensing parameters set for the multiple acoustic sensors, so as to set the vibration parameters of the vibration excitation unit and the sensing parameters of the multiple acoustic sensors.

[0034] In this embodiment, the vibration parameters of the vibration excitation unit and the sensing parameters of multiple acoustic sensors can be conveniently set on the human-machine interface of the data control and processing terminal, such as... Figure 7 As shown, the vibration parameters include at least the initial vibration frequency, the final vibration frequency, the vibration running time, the vibration running parameters, the running mode, and the number of runs. By setting these vibration parameters, the vibration excitation unit can perform wide-frequency vibration according to the parameters. Furthermore, the data control processing terminal is electrically connected to an external device. Responding to the vibration parameter export command from the human-machine interface, the data control processing terminal conveniently exports the vibration parameters to the external device for use in other stages of product manufacturing. In other embodiments, the set vibration parameters can also be directly imported from an external source to the data control processing terminal and displayed on the human-machine interface, enabling convenient setting of the vibration parameters of the vibration excitation unit through the data control processing terminal.

[0035] like Figure 8 As shown, the sensing parameters include at least channel identifiers, sensitivity, signal-to-noise ratio, operating status, and position information of multiple acoustic sensors. By setting the sensing parameters, the acoustic sensor array can acquire signals according to the set parameters. Furthermore, the data control and processing terminal is electrically connected to external devices. Responding to the sensing parameter export command from the human-machine interface, the data control and processing terminal can conveniently export the sensing parameters to external devices for use in other stages of product manufacturing. In other embodiments, the set sensing parameters can also be directly imported from external sources into the data control and processing terminal and displayed on the human-machine interface, enabling convenient setting of the sensing parameters of the acoustic sensor array through the data control and processing terminal.

[0036] In other embodiments, the data control and processing terminal is also used to control the foreign particle detection process of the vibration excitation unit, acoustic sensor and signal processing unit respectively, and to generate a foreign particle detection report and display it on the human-machine interface.

[0037] The process involves fixing the product to be tested onto the vibration excitation unit, then turning on the vibration excitation unit via the data control and processing terminal. Once the vibration excitation unit has been running stably for a period of time, the acoustic sensor and signal processing unit are then turned on via the data control and processing terminal to collect acoustic signals. The acoustic signals are then analyzed and processed in the signal processing unit.

[0038] It is understandable that the foreign particle detection system described above, which includes a vibration excitation unit, at least one acoustic sensor, a signal processing unit, and a data control and processing terminal, requires very little manual operation and has a high degree of automation when detecting foreign particles in products, thus greatly improving detection efficiency.

[0039] It is understandable that the aforementioned signal processing unit can be integrated into the data control and processing terminal, or it can be a standalone device independent of the data control and processing terminal.

[0040] This invention can be used to detect the presence of foreign particles inside products in fields such as aviation, aerospace, military, communications, and new energy vehicles, including integrated circuits, transistors, capacitors, and other high-end equipment manufacturing equipment. Specifically, this invention can also be used for foreign particle detection in packaged products, aiming to detect free foreign particles within the device's packaging cavity. This is a non-destructive or non-destructive testing method that improves product quality and reliability.

[0041] This invention effectively excites foreign particles of different masses and materials within a product through broadband mechanical vibration, causing excess foreign particles to move and collide within the product. At least one acoustic sensor collects the acoustic signals generated by the product under test. After analyzing the acoustic signals, a data control processing terminal determines the presence of foreign particles inside the product based on the signal analysis results. This embodiment reduces the minimum detectable mass of foreign particles to 50mg through broadband vibration, increasing the detection accuracy to over 95%. It boasts high accuracy and a high degree of automation, significantly improving the efficiency of foreign particle detection.

[0042] This invention also provides a method for detecting foreign particles based on multi-frequency vibration. This method is executed based on the aforementioned foreign particle detection system based on multi-frequency vibration, and includes: The product to be tested is fixed onto the vibration excitation unit; The vibration excitation unit is activated to generate broadband mechanical vibration; The acoustic sensor is activated to collect the acoustic signal generated by the product under test during the vibration of the vibration excitation unit. The signal processing unit is activated to perform signal analysis on the acoustic signal and output the signal analysis results. The data control and processing terminal determines whether there are foreign particles inside the product to be tested based on the signal analysis results, and outputs the detection results.

[0043] Furthermore, the foreign particle detection method based on multi-frequency vibration also includes: after the vibration excitation unit is started for a preset time, for example, after vibrating at 50Hz for 60 seconds, the acoustic sensor is then started, so that the acoustic sensor can accurately collect the corresponding acoustic signal and avoid collecting other irrelevant signals.

[0044] When the acoustic sensor is activated, the acoustic sensor that is in complete contact with the product to be tested is activated, and the acoustic sensor that is not in complete contact with the product to be tested is deactivated. Only the acoustic sensor that is in complete contact with the product can accurately collect the acoustic signal of the product.

[0045] This invention effectively excites foreign particles of different masses and materials within a product through broadband mechanical vibration, causing excess foreign particles to move and collide within the product. At least one acoustic sensor collects the acoustic signals generated by the product under test. After analyzing the acoustic signals, a data control processing terminal determines the presence of foreign particles inside the product based on the signal analysis results. This embodiment reduces the minimum detectable mass of foreign particles to 50mg through broadband vibration, increasing the detection accuracy to over 95%. It boasts high accuracy and a high degree of automation, significantly improving the efficiency of foreign particle detection.

[0046] Figure 9 The diagram shows a structural schematic of an embodiment of the computer device of the present invention. The specific embodiments of the present invention do not limit the specific implementation of the computer device.

[0047] like Figure 9 As shown, the computer device may include: a processor 402, a communications interface 404, a memory 406, and a communications bus 408.

[0048] The processor 402, communication interface 404, and memory 406 communicate with each other via communication bus 408. Communication interface 404 is used to communicate with other computer devices, such as clients or other server network elements. The processor 402 executes program 410, specifically performing operations executed by the signal processing unit and data control processing terminal in the aforementioned system.

[0049] Specifically, program 410 may include program code, which includes computer-executable instructions.

[0050] Processor 402 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The computer device includes one or more processors, which may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0051] Memory 406 is used to store program 410. Memory 406 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0052] Specifically, program 410 can be called by processor 402 to enable the computer device to perform operations executed by the signal processing unit and data control processing terminal in the system.

[0053] This invention provides a computer-readable storage medium storing at least one executable instruction. When the executable instruction is executed on a computer device, it causes the computer device to perform the operations performed by the signal processing unit and the data control processing terminal in the above-described system.

[0054] This invention provides a computer program that can be called by a processor to enable a computer device to perform the operations executed by the signal processing unit and data control processing terminal in the above system.

[0055] This invention provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions, which, when executed on a computer, cause the computer to perform the aforementioned method embodiment for a data control processing terminal.

[0056] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, the embodiments of the present invention are not directed to any particular programming language. It should be understood that the content of the invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of the invention.

[0057] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0058] Similarly, it should be understood that, in order to streamline the invention and aid in understanding one or more of the various aspects of the invention, features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof in the above description of exemplary embodiments of the invention. However, this disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim.

[0059] Those skilled in the art will understand that modules in the computer device of the embodiments can be adaptively modified and placed in one or more computer devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or computer device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0060] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A foreign particle detection system based on multi-frequency vibration, characterized in that, The system includes a vibration excitation unit, at least one acoustic sensor, a signal processing unit, and a data control and processing terminal, with the product to be tested fixed on the vibration excitation unit. The vibration excitation unit is used to generate broadband mechanical vibration; The acoustic sensor is mounted on the product under test and is used to collect the acoustic signals generated by the product under test during the vibration of the vibration excitation unit. The signal processing unit is electrically connected to the acoustic sensor and is used to perform signal analysis on the acoustic signal and output the signal analysis results. The data control and processing terminal is electrically connected to the signal processing unit and is used to determine whether there are foreign particles inside the product to be tested based on the signal analysis results, and output the detection results.

2. The system according to claim 1, characterized in that, The acoustic sensor includes multiple acoustic sensors, at least two of which are spaced apart on the product to be tested. They are also used to collect acoustic signals generated at different positions of the product to be tested during the vibration of the vibration excitation unit. Each acoustic signal is transmitted to the signal processing unit through a separate channel. The signal processing unit is further configured to perform signal analysis on the acoustic signal of each of the channels respectively, and output the signal analysis result corresponding to each of the channels; The data control and processing terminal is also used to collaboratively determine whether there are foreign particles inside the product to be tested based on the signal analysis results of all the channels, and output the detection results.

3. The system according to claim 2, characterized in that, The data control and processing terminal includes a human-machine interface, which is used to display the signal analysis results and detection results of each channel. The data control and processing terminal is also electrically connected to the vibration excitation unit and the acoustic sensor. The human-machine interface is also used to receive vibration parameters set for the vibration excitation unit and sensing parameters set for the multiple acoustic sensors, so as to set the vibration parameters of the vibration excitation unit and the sensing parameters of the multiple acoustic sensors.

4. The system according to claim 3, characterized in that, The vibration parameters include at least the initial vibration frequency, the final vibration frequency, the vibration running time, the vibration running parameters, the running mode, and the number of runs. The data control and processing terminal is also electrically connected to an external device, and the data control and processing terminal also responds to the vibration parameter export command of the human-machine interface to export the vibration parameters to the external device. The sensing parameters include at least channel identifier, sensitivity, signal-to-noise ratio, operating status, and position information of multiple acoustic sensors. The data control and processing terminal also responds to the sensing parameter export command of the human-machine interface and exports the sensing parameters to the external device.

5. The system according to claim 3, characterized in that, The data control and processing terminal is also used to control the foreign particle detection process of the vibration excitation unit, the acoustic sensor and the signal processing unit respectively, and to generate a foreign particle detection report and display it on the human-machine interface.

6. The system according to claim 1, characterized in that, The data control and processing terminal is also used to determine whether there are foreign particles inside the product to be tested based on the signal analysis results and the ambient noise frequency band, and output the detection results: If the signal analysis results show signals in other frequency bands different from the ambient noise frequency band, then foreign particles are present inside the product to be tested. If the signal analysis results show only a frequency band that is the same as the ambient noise frequency band, then there are no foreign particles inside the product to be tested.

7. A method for detecting foreign particles based on multi-frequency vibration, characterized in that, The foreign particle detection method based on multi-frequency vibration is executed based on the foreign particle detection system based on multi-frequency vibration according to any one of claims 1-6, and the foreign particle detection method based on multi-frequency vibration includes: The product to be tested is fixed onto the vibration excitation unit; The vibration excitation unit is activated to generate broadband mechanical vibration; The acoustic sensor is activated to collect the acoustic signal generated by the product under test during the vibration of the vibration excitation unit. The signal processing unit is activated to perform signal analysis on the acoustic signal and output the signal analysis results. The data control and processing terminal determines whether there are foreign particles inside the product to be tested based on the signal analysis results, and outputs the detection results.

8. The method according to claim 7, characterized in that, Also includes: The acoustic sensor is activated after a preset time has elapsed since the vibration excitation unit was started. When the acoustic sensors are activated, the acoustic sensors that are in complete contact with the product under test are activated, and the acoustic sensors that are not in complete contact with the product under test are deactivated.

9. A computer device, characterized in that, include: The processor, memory, communication interface, and communication bus are provided, wherein the processor, memory, and communication interface communicate with each other via the communication bus. The memory is used to store at least one executable instruction, which causes the processor to perform the operations performed by the signal processing unit and the data control processing terminal in the system as described in any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, The storage medium stores at least one executable instruction, which, when executed on a computer device, causes the computer device to perform the operations performed by the signal processing unit and data control processing terminal in the system as described in any one of claims 1-6.

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