An apparatus, method and server for implementing server active noise reduction

Abstract

The application provides a device for realizing active noise reduction of a server, which comprises a vibration collecting module, a signal processing module and a vibration module, the vibration collecting module collects a first vibration signal generated by noise of a server fan module during operation; the signal processing module converts the first vibration signal into a first digital signal, generates a second digital signal according to frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, converts the second digital signal into a corresponding electric signal, outputs the corresponding electric signal to the vibration module, generates a second vibration signal through the vibration module, and realizes noise reduction when the second vibration signal and the first vibration signal are superimposed and offset each other; the application further provides a method for realizing active noise reduction of a server and a server, which effectively improves server fan noise reduction reliability and reduces server fan noise reduction cost.

Description

Technical Field

[0001] This invention relates to the field of servers, and in particular to an apparatus, method, and server for implementing active noise reduction in servers. Background Technology

[0002] In daily operation, cooling fans are one of the main sources of noise in servers. With the rise of the Internet industry, the performance requirements of servers are getting higher and higher, which will significantly increase the heat generated. Correspondingly, the speed of cooling fans will increase. The higher the speed, the more noise. This will not only cause noise pollution, but also cause certain health damage to maintenance, repair and testing personnel. Therefore, it is necessary to reduce server fan noise and create a healthy working environment.

[0003] In related technologies, there are generally two ways to reduce server fan noise. One way is to control the ambient temperature around the server. The BMC (Baseboard Management Controller) uses sensors to read the current temperature values ​​in the registers of each component to automatically control and reduce the fan speed, thereby reducing fan noise. The other way is to use LC (liquid cooling) technology, in which liquid is injected into the server and heat is removed through heat exchange, reducing the use of server fans and thus reducing server fan noise. From the perspective of server physical form, there are: cold plate liquid-cooled servers and fully immersed liquid-cooled servers.

[0004] Automatically reducing fan speed based on the current temperature can lower the server's operating temperature, but this requires adding an air conditioning system, which inevitably increases carbon emissions to some extent. Moreover, reducing fan speed may cause the server to operate at high temperatures, resulting in low reliability. While liquid cooling technology offers lower noise at the same heat dissipation level, it is more complex in structure, cumbersome to install, and more expensive, which is not conducive to improving the reliability of server fan noise reduction or reducing server fan noise reduction costs. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention innovatively proposes a device, method and server for active noise reduction of servers, which effectively solves the problems of low reliability or high cost of server fan noise reduction caused by the prior art, effectively improves the reliability of server fan noise reduction and reduces the cost of server fan noise reduction.

[0006] The first aspect of this invention provides an apparatus for active noise reduction in a server, comprising: a vibration acquisition module, a signal processing module, and a vibration module. The vibration acquisition module is used to acquire a first vibration signal that generates noise during the operation of a server fan module and send the first vibration signal to the signal processing module. The signal processing module converts the first vibration signal into a first digital signal based on the characteristic information of the first vibration signal, obtains the frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, generates a second digital signal based on the obtained frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, converts the second digital signal into a corresponding electrical signal, and outputs the corresponding electrical signal to the vibration module. The vibration module is used to generate a second vibration signal based on the analyzed electrical signal, which cancels out the first vibration signal when the second vibration signal is superimposed, thereby reducing noise. The second vibration signal has the same frequency and amplitude as the first vibration signal but an opposite waveform, and the second digital signal has the same frequency and amplitude as the first digital signal but an opposite waveform.

[0007] Optionally, the vibration acquisition module is located at the bottom of the fan in the fan frame of the server fan module to ensure that the acquired first vibration signal is forwarded to the signal processing module;

[0008] The vibration acquisition module includes multiple vibration sensors, and the position of each vibration sensor corresponds one-to-one with the position of the fan in the fan module.

[0009] Optionally, the signal processing module includes a first filtering submodule, a signal conversion submodule, a signal processing submodule, and a second filtering submodule that are sequentially connected in communication.

[0010] The first filtering submodule is communicatively connected to the vibration acquisition module and is used to filter the first vibration signal. Specifically, it includes: decomposing the input first vibration signal into a set of sine waves of different frequencies, combining the decomposed sine waves, and filtering the combined first vibration signal.

[0011] The signal conversion submodule generates a first digital signal based on the amplitude, frequency, and phase information of the filtered first vibration signal;

[0012] The signal processing submodule is used to acquire the frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, generate a second digital signal based on the acquired frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, and convert the second digital signal into a corresponding electrical signal.

[0013] The second filtering submodule is used to filter the converted electrical signal and output the filtered electrical signal to the vibration module.

[0014] Furthermore, the input first vibration signal is decomposed into a set of sine waves of different frequencies, the decomposed sine waves are combined, and the combined first vibration signal is filtered, specifically including:

[0015] The input first vibration signal is decomposed into a set of sine waves of different frequencies using Fourier transform, and the decomposed sine waves are then combined; specifically:

[0016] X_f(t)1=\sum_{k2=-\infty}^{\infty}x_k2(t)e^{-2\pi*i*k2*f1*t}

[0017] Where X_f(t)1 represents the signal after Fourier transform, x_k2(t) represents the k2-th sine wave in the input signal, f1 represents the frequency of the k2-th sine wave in the input signal, t represents the time of the k2-th sine wave in the input signal, e^{-2\pi*i*k2*f1*t represents the phase of the result of the Fourier transform of the k2-th sine wave in the input signal in the time domain, sum is the summation function, infty is the original first vibration signal in the input, and the expression is: S(t)=A1*e^(-j*2*pi*T*t); where S(t) is the first vibration signal, A represents the amplitude of the first vibration signal, e represents natural decay, j represents the angular frequency of the first vibration signal, T1 represents the vibration period of the first vibration signal, and pi is π;

[0018] The first vibration signal after combination is filtered by a Fourier transform denoiser, specifically: X_f(t)2=\approx X_f(t)1+R(t)X_f(t)1^2;

[0019] Where X_f(t)2 represents the first vibration signal after filtering, R(t) is the Fourier transform denoiser, approx is the approximation function, and X_f(t)1 is the first vibration signal after the combination of unfiltered waves.

[0020] Furthermore, the signal conversion submodule generates a first digital signal based on the amplitude, frequency, and phase information of the filtered first vibration signal, specifically including:

[0021] The amplitude information of the filtered first vibration signal is the sum of the initial amplitude of the filtered first vibration signal and the amplitude difference between the two periods of the filtered first vibration signal;

[0022] The period information of the first vibration signal after filtering is T2=2*pi*A1 / (j*k1), where A1 is the amplitude information of the first vibration signal after filtering, k1 is the amplitude coefficient, and T2 is the period information of the first vibration signal after filtering.

[0023] The frequency information of the first vibration signal after filtering is f2=j / (2*pi*T2), where f2 is the frequency information of the first vibration signal after filtering;

[0024] The phase information of the first vibration signal after filtering is ψ1=2*pi*f2*t, where ψ1 is the phase information of the first vibration signal after filtering;

[0025] The amplitude information of the first digital signal is A2 = f2 / 2, where A2 represents the amplitude of the first digital signal and / 2 represents a phase of 0 degrees;

[0026] The frequency information of the first digital signal is f3 = A2 / 2, where f3 represents the frequency of the first digital signal;

[0027] The phase information of the first digital signal is ψ2 = 2*pi*f3 / 2, where ψ2 is the phase information of the first digital signal.

[0028] Furthermore, the signal processing submodule is used to acquire the frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, and to generate a second digital signal based on the acquired frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal. Converting the second digital signal into a corresponding electrical signal specifically includes:

[0029] After the signal processing submodule obtains the frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, it shifts the waveform of the first digital signal B(t) to the right by one cycle while keeping the amplitude unchanged. The resulting waveform is the second digital signal C(t).

[0030] The second digital signal is converted into the corresponding electrical signal C(t) based on the sampling rate and sampling interval of the second digital signal.

[0031] Furthermore, the second filtering submodule filters the converted electrical signal and outputs the filtered electrical signal to the vibration module, specifically including:

[0032] The transformed electrical signal is decomposed into a set of sine waves of different frequencies using Fourier transform, and these decomposed sine waves are then combined; specifically:

[0033] X_f(t)4=\sum_{k3=-\infty}^{\infty}x_k3(t)e^{-2\pi*i*k3*f4*t}

[0034] Where X_f(t)4 represents the electrical signal after Fourier transform, x_k3(t) represents the k2th sine wave in the input signal, f4 represents the frequency of the k3rd sine wave in the input signal, t represents the time of the k3rd sine wave in the input signal, e^{-2\pi*i*k2*f1*t represents the phase of the result of the Fourier transform of the k3rd sine wave in the input signal in the time domain, sum is the summation function, and infty is the input electrical signal;

[0035] The first vibration signal after combination is filtered by a Fourier transform denoiser, specifically: X_f(t)5=\approx X_f(t)4+R(t)X_f(t)4^2;

[0036] Where X_f(t)5 represents the filtered electrical signal, R(t) is the Fourier transform denoiser, approx is the approximation function, and X_f(t)4 is the electrical signal after combining the unfiltered waves.

[0037] Furthermore, the vibration module analyzes the filtered electrical signal sent by the second filtering submodule, restores the second digital signal based on the filtered electrical signal, then restores the first digital signal based on the restored second digital signal, and generates a second vibration signal based on the restored first digital signal. This second vibration signal is used to cancel each other out when the second vibration signal and the first vibration signal are superimposed, thereby reducing noise.

[0038] Optionally, the vibration module includes multiple evenly distributed vibrators, each corresponding to a vibration sensor. The vibrators are located on both sides inside the chassis, and a soft wrapping layer is attached below the vibrators to prevent resonance between the vibrators and the server chassis.

[0039] The second aspect of this invention provides a method for implementing active noise reduction for servers, based on the apparatus for implementing active noise reduction for servers described in the first aspect of this invention, comprising:

[0040] The vibration acquisition module acquires the first vibration signal of the noise generated by the server fan module during operation and sends the first vibration signal to the signal processing module;

[0041] The signal processing module converts the first vibration signal into a first digital signal based on the characteristic information of the first vibration signal, obtains the frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, generates a second digital signal based on the obtained frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, converts the second digital signal into a corresponding electrical signal, and outputs the corresponding electrical signal to the vibration module.

[0042] The vibration module is used to generate a second vibration signal based on the analyzed electrical signal. When the second vibration signal is superimposed on the first vibration signal, they cancel each other out, thereby reducing noise. The second vibration signal has the same frequency and amplitude as the first vibration signal but the opposite waveform. The second digital signal also has the same frequency and amplitude as the first digital signal but the opposite waveform.

[0043] A third aspect of the present invention provides a server, including the device for active noise reduction of the server described in the first aspect of the present invention.

[0044] The technical solution adopted in this invention has the following technical effects:

[0045] 1. A device for active noise reduction of a server according to the technical solution of the present invention includes: a vibration acquisition module, a signal processing module, and a vibration module. The vibration acquisition module is used to acquire a first vibration signal that generates noise during the operation of the server fan module and send the first vibration signal to the signal processing module. The signal processing module converts the first vibration signal into a first digital signal according to the characteristic information of the first vibration signal, obtains the frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, and generates a second digital signal according to the obtained frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal. The second digital signal is converted into a corresponding electrical signal and output to the vibration module. The vibration module generates a second vibration signal, which is used to cancel each other out when the second vibration signal is superimposed with the first vibration signal, thereby reducing noise. The second vibration signal has the same frequency and amplitude as the first vibration signal but the waveform is opposite, which effectively solves the problem of low reliability or high cost of server fan noise reduction caused by the prior art, effectively improves the reliability of server fan noise reduction, and reduces the cost of server fan noise reduction.

[0046] 2. In the technical solution of the present invention, the vibration acquisition module is set at the bottom of the fan in the fan frame of the server fan module to ensure that the first vibration signal acquired is forwarded to the signal processing module; the vibration acquisition module includes multiple vibration sensors, and the position of each vibration sensor corresponds one-to-one with the position of the fan in the fan module to ensure accurate acquisition of the vibration signal that generates noise when the fan is running.

[0047] 3. The signal processing module in the technical solution of the present invention includes a first filtering submodule, a signal conversion submodule, a signal processing submodule, and a second filtering submodule that are connected in sequence. It can not only filter the first vibration signal acquired by the vibration acquisition module, but also filter the converted electrical signal, ensuring the comprehensiveness of the signal information, thereby improving the accuracy and reliability of the second vibration signal.

[0048] 4. In the technical solution of the present invention, the amplitude information of the first vibration signal after filtering is the sum of the initial amplitude of the first vibration signal after filtering and the amplitude difference between the two periods of the first vibration signal after filtering. Compared with the vibration amplitude value in the traditional solution, the advantage is that it can capture the amplitude information and periodic information in the first vibration signal, that is, including amplitude and period, while the traditional solution only considers amplitude, ensuring the comprehensiveness of signal information and further improving the accuracy and reliability of the second vibration signal.

[0049] 5. The vibration module described in the technical solution of the present invention is disposed on both sides inside the chassis, and a soft wrapping layer is attached below the vibration module to avoid resonance between the vibration module and the server chassis; the vibration module converts the received electrical signal into a second vibration signal and transmits it to the chassis environment in a timely manner to achieve active noise reduction of the server. This not only does not affect the existing layout of the server, but also avoids resonance between the vibration module and the server chassis, thus effectively achieving active noise reduction of the server.

[0050] 6. The technical solution of this invention can reduce noise pollution through active noise reduction, effectively reduce the frequency and intensity of sound, reduce noise interference, and help create a healthy and comfortable working environment for staff, facilitate easy and accurate communication, and improve work efficiency; moreover, it has a simple structure and low cost.

[0051] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram illustrating the principle of the superposition and cancellation of the first vibration signal and the second vibration signal in the device of Embodiment 1 of the present invention;

[0054] Figure 2 This is a schematic diagram of the device in Embodiment 1 of the present invention;

[0055] Figure 3 This is a schematic diagram of the structural distribution of the device in Embodiment 1 of the present invention;

[0056] Figure 4 This is a flowchart illustrating the method of Embodiment 2 in the present invention. Detailed Implementation

[0057] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure of the invention, components and arrangements of specific examples are described below. Furthermore, reference numerals and / or letters may be repeated in different examples. This repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. Descriptions of well-known components, processing techniques, and processes are omitted in this invention to avoid unnecessarily limiting the invention.

[0058] Example 1

[0059] like Figure 1 As shown, the present invention provides a device for active noise reduction of a server, comprising: a vibration acquisition module 1, a signal processing module 2, and a vibration module 3. The vibration acquisition module 1 is used to acquire a first vibration signal that generates noise during the operation of the server fan module and send the first vibration signal to the signal processing module 2. The signal processing module 2 converts the first vibration signal into a first digital signal based on the characteristic information of the first vibration signal, obtains the frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, and generates a second digital signal based on the obtained frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal. The second digital signal is converted into a corresponding electrical signal and output to the vibration module 3. The vibration module 3 is used to generate a second vibration signal based on the analyzed electrical signal. When the second vibration signal and the first vibration signal are superimposed, they cancel each other out, thereby reducing noise. The second vibration signal has the same frequency and amplitude as the first vibration signal but opposite waveforms, and the second digital signal has the same frequency and amplitude as the first digital signal but opposite waveforms.

[0060] When server fans are running at high speed, they not only generate noise pollution and affect the working environment, but prolonged noise can also affect communication and interaction during daily work, and reduce staff concentration and work efficiency to some extent.

[0061] Currently, the three common noise reduction measures—noise reduction at the sound source, noise reduction during propagation, and noise reduction at the human ear—are all passive. To actively eliminate noise (ANC, Active Noise Cancellation), the technology of "active noise cancellation" was invented. All sounds are generated by vibrations and a certain frequency spectrum. If the vibration spectrum of the noise generated by the server can be accurately acquired, its characteristics analyzed, and then a reverse sound wave emitted to cancel the original noise signal, active noise cancellation can be achieved.

[0062] like Figure 2 As shown, vibration signal a is the vibration signal that generates noise from the operation of the server fan module, and vibration signal b is the emitted reverse sound wave. After the interaction between vibration signal a and vibration signal b, they cancel each other out when superimposed, generating vibration signal c. Compared with vibration signal a, vibration signal c has a significantly reduced amplitude, thereby achieving the purpose of reducing noise.

[0063] Among them, such as Figure 3 As shown, the vibration acquisition module 1 is located at the bottom of the fan in the fan frame of the server fan module. Specifically, it can be extended from the server motherboard to the fan frame, below the fan, to ensure that the acquired first vibration signal is forwarded to the signal processing module 2. The vibration acquisition module 1 is an addition to the server's equipment monitoring and management system to collect vibration signals of server noise.

[0064] The vibration acquisition module 1 includes multiple vibration sensors 11 (such as accelerometers, gyroscopes, or other vibration sensors). The position of each vibration sensor 11 corresponds one-to-one with the position of the fan in the fan module. Specifically, it can be extended from the server motherboard to the bottom of each fan in the fan frame by a connector to ensure that the accurately acquired amplitude signal is handed over to the signal processing module installed on the motherboard.

[0065] The signal processing module 2 (integrated processor) includes a first filtering submodule 21 (which is connected in series with the signal processing module 2) via communication. Figure 3 The middle two-sided filter, i.e., high and low frequency original signal filtering), signal conversion submodule 22 ( Figure 3 Analog signal processor), signal processing submodule 23 ( Figure 3 DSP), second filtering submodule 24 ( Figure 3 The first filtering submodule 21 is communicatively connected to the vibration acquisition module 1 and is used to filter the first vibration signal. Specifically, it includes: decomposing the input first vibration signal into a set of sine waves of different frequencies, combining the decomposed sine waves, and filtering the combined first vibration signal.

[0066] The signal conversion submodule 22 generates a first digital signal based on the amplitude information, frequency information, and phase information of the filtered first vibration signal;

[0067] The signal processing submodule 23 is used to acquire the frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, and generate a second digital signal based on the acquired frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, and convert the second digital signal into a corresponding electrical signal;

[0068] The second filtering submodule 24 is used to filter the converted electrical signal and output the filtered electrical signal to the vibration module 3.

[0069] The electrical signal may include a current signal or a voltage signal. The first filtering submodule 21, the signal conversion submodule 22, the signal processing submodule 23, and the second filtering submodule 24 are all located in the server motherboard.

[0070] The vibration sensor 11 forwards the acquired first vibration signal to the first filtering submodule 21. The first filtering submodule 21 is communicatively connected to the vibration acquisition module and is used to filter the first vibration signal, removing noise and interference signals, thereby improving the quality and clarity of the original signal. Specifically, the input first vibration signal is decomposed into a set of sine waves of different frequencies, the decomposed sine waves are combined, and the combined first vibration signal is filtered.

[0071] Specifically: First, the input first vibration signal is decomposed into a set of sine waves of different frequencies using Fourier transform, and then the decomposed sine waves are combined; specifically:

[0072] X_f(t)1=\sum_{k2=-\infty}^{\infty}x_k2(t)e^{-2\pi*i*k2*f1*t}(Fourier Transform)

[0073] Where X_f(t)1 represents the signal after Fourier transform, x_k2(t) represents the k2-th sine wave in the input signal, f1 represents the frequency of the k2-th sine wave in the input signal, t represents the time of the k2-th sine wave in the input signal, e^{-2\pi*i*k2*f1*t represents the phase of the result of the Fourier transform of the k2-th sine wave in the input signal in the time domain, sum is the summation function, infty is the original first vibration signal in the input, and the expression is: S(t)=A1*e^(-j*2*pi*T*t); where S(t) is the first vibration signal, A represents the amplitude of the first vibration signal, e represents natural decay, j represents the angular frequency of the first vibration signal, T1 represents the vibration period of the first vibration signal, and pi is π;

[0074] Then, the combined first vibration signal is filtered by a Fourier transform denoiser. That is, the frequency domain signal obtained by Fourier transform can be used to filter and denoise the combined first vibration signal. For linear filtering in active noise reduction technology, the specific formula is: X_f(t)2=\approx X_f(t)1+R(t)X_f(t)1^2;

[0075] Where X_f(t)2 represents the first vibration signal after filtering, R(t) is the Fourier transform denoiser, approx is the approximation function, and X_f(t)1 is the first vibration signal after the combination of unfiltered waves.

[0076] Specifically, the signal conversion submodule 22 can be an analog signal processor that converts the first vibration signal (analog signal) into a first digital signal using FFT (Fast Fourier transform). The first digital signal is then sent to the signal processing submodule 23 in binary code. The signal conversion submodule 22 generates the first digital signal based on the amplitude, frequency, and phase information of the filtered first vibration signal, specifically including:

[0077] The amplitude information of the first vibration signal after filtering is the sum of the initial amplitude of the first vibration signal after filtering and the amplitude difference between the two periods of the first vibration signal after filtering; that is, A=X_f(0)2+X_f(2)2-X_f(1)2;

[0078] Where X_f(0)2 represents the initial amplitude, X_f(2)2 and X_f(1)2 represent the amplitudes of the first vibration signal after filtering in the 2nd and 1st parts of time, respectively. Since the period of the vibration signal is 2*pi, the amplitudes in the 2nd and 1st parts are 1 and 0, respectively.

[0079] The period information of the first vibration signal after filtering is T2=2*pi*A1 / (j*k1), where A1 is the amplitude information of the first vibration signal after filtering, k1 is the amplitude coefficient (the amplitude coefficient is a constant that determines the relationship between vibration amplitude and vibration frequency), and T2 is the period information of the first vibration signal after filtering.

[0080] The frequency information of the first vibration signal after filtering is f2=j / (2*pi*T2), where f2 is the frequency information of the first vibration signal after filtering;

[0081] The phase information of the first vibration signal after filtering is ψ1=2*pi*f2*t, where ψ1 is the phase information of the first vibration signal after filtering;

[0082] The amplitude information of the first digital signal is A2 = f2 / 2, where A2 represents the amplitude of the first digital signal and / 2 represents a phase of 0 degrees;

[0083] The frequency information of the first digital signal is f3 = A2 / 2, where f3 represents the frequency of the first digital signal;

[0084] The phase information of the first digital signal is ψ2 = 2*pi*f3 / 2, where ψ2 is the phase information of the first digital signal.

[0085] The amplitude A2 of the first digital signal is related to the frequency f3 and the phase ψ2 of the vibration amplitude. The amplitude is maximum when the phase is 0 degrees and minimum when the phase is 2π. The amplitude is inversely proportional to the frequency and independent of the phase of the vibration amplitude. Therefore, the phase relationship of the amplitude can be expressed as the amplitude being maximum when the phase = 0 and minimum when the phase = 2π. The encoded result of the first digital signal (amplitude information, frequency information, and phase information of the first digital signal) is sent to the digital signal processor (DSP, i.e., signal processing submodule 23) in binary form.

[0086] Signal conversion submodule 22 generates a first digital signal: the first digital signal obtained by quantizing and encoding the filtered first vibration signal. The quantized signal is:

[0087] The filtered first vibration signal is quantized using digital signal processing software or hardware. The quantization process converts the filtered first vibration signal into a series of digital values ​​that describe the signal's frequency, amplitude, phase, etc., typically using discrete representations in finite or infinite fields.

[0088] Finite field discrete representation: Representing features as a discrete sequence of a finite field, such as STFT (Short Time Fourier Transform) and HOG (Hough Transform).

[0089] Infinite-domain discrete representation: This represents features as a discrete sequence over an infinite domain, such as the Discrete Fourier Transform (DFT) and Discrete Wavelet Transform (DWT). The specific implementation of these algorithms varies depending on the application scenario. Specifically, STFT converts a time-domain signal to a frequency-domain signal and extracts features at different frequencies. HOG converts a frequency-domain signal to a spatial-domain signal and extracts the structure at different frequencies. DWT converts a time-domain signal to a frequency-domain signal and extracts features at different frequencies.

[0090] The signal processing submodule 23 can be a digital signal processor (DSP). The DSP analyzes the first digital signal, identifying its specific frequency, phase, and amplitude characteristics; it generates a second digital signal, converts it into an electrical signal, generates a second vibration signal through the vibration module 3, and transmits the second vibration signal back to the chassis environment. When the second vibration signal is superimposed on the first vibration signal of the original noise, they cancel each other out, thereby reducing noise. Specifically, the first and second vibration signals have the same frequency and amplitude, but opposite waveforms; the first and second digital signals have the same frequency and amplitude, but opposite waveforms.

[0091] The signal processing submodule 23 is used to acquire the frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, and to generate a second digital signal based on the acquired frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal. Converting the second digital signal into a corresponding electrical signal specifically includes:

[0092] After acquiring the frequency, amplitude, and phase characteristics of the first digital signal, the signal processing submodule shifts the waveform of the first digital signal B(t) to the right by one cycle while keeping the amplitude unchanged. The resulting waveform is the second digital signal C(t). Specifically,

[0093] The second digital signal is converted into the corresponding electrical signal C(t) based on the sampling rate and sampling interval of the second digital signal.

[0094] Let the amplitude of the first digital signal B(t) be A2, the frequency be f3, the phase information be ψ2, and the period be T3. Then the amplitude of its second digital signal C(t) is A2, the frequency is f3, and the period is +T3.

[0095] Therefore, it can be expressed as: C(t) = B(t+T3) / 2;

[0096] Where t represents the time-domain representation of signals C(t) and B(t), T3 represents the period of the first digital signal B(t), and the second digital signal C(t) represents the inverse signal of the first digital signal B(t). The inverse signal is generated by shifting the waveform of the first digital signal B(t) to the right by one period T3, while keeping the amplitude unchanged. The resulting waveform is the second digital signal C(t). They have the same frequency and amplitude, but their periods and waveforms are opposite.

[0097] Then, the second digital signal, which has the same frequency and amplitude as the noise but with the opposite waveform, is calculated and converted into an electrical signal. Specifically, the amplitude of the electrical signal is D = E * (1 + 1 / T⁴).

[0098] Where D represents the amplitude of the electrical signal D(t) (range [0,1]), E represents the sampling rate of the second digital signal (in Hz), and T4 represents the sampling interval (in seconds), i.e., one sampling takes 1 second, and two samplings take 2 seconds. Each sampling point of the second digital signal C(t) is converted into a sampling point of the electrical signal D(t). The value of 1 at each sampling point indicates that the electrical signal D(t) is full at that sampling point, and 0 indicates that the signal D(t) is empty at that sampling point. The value of the sampling rate E determines the bandwidth of the electrical signal D(t), i.e., the amplitude range of the electrical signal D(t) at that sampling point. The value of the sampling interval T4 determines the number of times the electrical signal D(t) is sampled, i.e., the number of times the value of the electrical signal D(t) changes at that sampling point.

[0099] The second filtering submodule 24 filters the converted electrical signal and outputs the filtered electrical signal to the vibration module. Specifically, it includes:

[0100] The transformed electrical signal is decomposed into a set of sine waves of different frequencies using Fourier transform, and these decomposed sine waves are then combined; specifically:

[0101] X_f(t)4=\sum_{k3=-\infty}^{\infty}x_k3(t)e^{-2\pi*i*k3*f4*t}

[0102] Where X_f(t)4 represents the electrical signal after Fourier transform, x_k3(t) represents the k2th sine wave in the input signal, f4 represents the frequency of the k3rd sine wave in the input signal, t represents the time of the k3rd sine wave in the input signal, e^{-2\pi*i*k2*f1*t represents the phase of the result of the Fourier transform of the k3rd sine wave in the input signal in the time domain, sum is the summation function, and infty is the input electrical signal;

[0103] The first vibration signal after combination is filtered by a Fourier transform denoiser, specifically: X_f(t)5=\approx X_f(t)4+R(t)X_f(t)4^2;

[0104] Where X_f(t)5 represents the filtered electrical signal, R(t) is the Fourier transform denoiser, approx is the approximation function, and X_f(t)4 is the electrical signal after combining the unfiltered waves.

[0105] Both the first filtering submodule 21 and the second filtering submodule 24 are bilateral filters located in the integrated processor.

[0106] The vibration module 3 analyzes the filtered electrical signal sent by the second filtering submodule 24, reconstructs the second digital signal from the filtered electrical signal, then reconstructs the first digital signal from the reconstructed second digital signal, and generates a second vibration signal from the reconstructed first digital signal. This second vibration signal cancels out the first vibration signal when they are superimposed, thereby reducing noise. The specific analysis process corresponds to the signal processing process described above, and will not be elaborated upon here.

[0107] Preferably, when the vibration acquisition module 1 includes multiple vibration sensors 11, the signal processing module 2 (i.e., the signal processing submodule 23) will calculate the average value of the frequency, amplitude, phase and other characteristic information of the first vibration signal of the multiple vibration sensors 11 to ensure the reliability of noise reduction.

[0108] The vibration module 3 is located on both sides inside the chassis (perpendicular to the fan distribution direction of the fan module). A soft wrapping layer is attached below the vibration module 3 (between the vibrator and the chassis) to prevent the vibration module 3 and the server chassis from resonating. The vibration module 3 converts the received electrical signal into a second vibration signal and transmits it to the chassis environment in a timely manner to achieve active noise reduction of the server.

[0109] Specifically, the vibration module 3 includes a plurality of evenly distributed vibrators 31 (vibration emitters), each vibrator 31 corresponding to a vibration sensor 11.

[0110] Correspondingly, when the vibration module 3 includes multiple vibrators 31, the signal processing module 2 (i.e., the signal processing submodule 23) will generate an electrical signal corresponding to the second digital signal, and then uniformly send the generated electrical signal corresponding to the second digital signal to the multiple vibration sensors 31 to ensure the reliability of noise reduction.

[0111] As the server experiences increased ambient temperature or excessive performance pressure during normal operation, it will automatically adjust its rotation speed based on the internal temperature, resulting in changes in noise levels. The vibration acquisition module 1 will detect these changes in real time and adjust the electrical signal corresponding to the second vibration signal through the signal processing module 2 to adapt to the constantly changing noise environment.

[0112] It should be noted that the technical solution of this invention only has a significant effect on regular and stable noise generated by the server, and will not reduce noise for daily staff communication and interaction.

[0113] An apparatus for active noise reduction in servers according to the present invention includes: a vibration acquisition module, a signal processing module, and a vibration module. The vibration acquisition module is used to acquire a first vibration signal that generates noise during the operation of the server fan module and send the first vibration signal to the signal processing module. The signal processing module converts the first vibration signal into a first digital signal based on the characteristic information of the first vibration signal, obtains the frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, generates a second digital signal based on the obtained frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, converts the second digital signal into a corresponding electrical signal, and outputs the corresponding electrical signal to the vibration module. The vibration module generates a second vibration signal, which cancels out the first vibration signal when the second vibration signal is superimposed, thereby reducing noise. The second vibration signal has the same frequency and amplitude as the first vibration signal but the opposite waveform, effectively solving the problem of low reliability or high cost of server fan noise reduction caused by existing technologies, effectively improving the reliability of server fan noise reduction and reducing the cost of server fan noise reduction.

[0114] In the technical solution of this invention, the vibration acquisition module is set at the bottom of the fan in the fan frame of the server fan module to ensure that the first vibration signal acquired is forwarded to the signal processing module; the vibration acquisition module includes multiple vibration sensors, and the position of each vibration sensor corresponds one-to-one with the position of the fan in the fan module to ensure accurate acquisition of the vibration signal that generates noise when the fan is running.

[0115] The signal processing module in this invention includes a first filtering submodule, a signal conversion submodule, a signal processing submodule, and a second filtering submodule that are connected in sequence. It can not only filter the first vibration signal acquired by the vibration acquisition module, but also filter the converted electrical signal, ensuring the comprehensiveness of the signal information, thereby improving the accuracy and reliability of the second vibration signal.

[0116] In the technical solution of this invention, the amplitude information of the filtered first vibration signal is the sum of the initial amplitude of the filtered first vibration signal and the amplitude difference between the two periods of the filtered first vibration signal. Compared with the vibration amplitude value in the traditional solution, the advantage is that it can capture the amplitude information and periodic information in the first vibration signal, that is, including amplitude and period, while the traditional solution only considers amplitude, ensuring the comprehensiveness of signal information and further improving the accuracy and reliability of the second vibration signal.

[0117] The vibration module described in the technical solution of this invention is disposed on both sides inside the chassis, and a soft wrapping layer is attached below the vibration module to avoid resonance between the vibration module and the server chassis. The vibration module converts the received electrical signal into a second vibration signal and transmits it to the chassis environment in a timely manner to achieve active noise reduction of the server. This not only does not affect the existing layout of the server, but also avoids resonance between the vibration module and the server chassis, thus effectively achieving active noise reduction of the server.

[0118] The technical solution of this invention can reduce noise pollution through active noise reduction, effectively reduce the frequency and intensity of sound, reduce noise interference, and help create a healthy and comfortable working environment for staff, facilitate easy and accurate communication, and improve work efficiency; moreover, it has a simple structure and low cost.

[0119] Example 2

[0120] like Figure 4 As shown, the present invention also provides a method for implementing active noise reduction for servers, which is based on a device for implementing active noise reduction for servers in Embodiment 1, and includes:

[0121] S1, the vibration acquisition module acquires the first vibration signal of the noise generated by the server fan module during operation, and sends the first vibration signal to the signal processing module;

[0122] S2, the signal processing module converts the first vibration signal into a first digital signal based on the characteristic information of the first vibration signal, obtains the frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, generates a second digital signal based on the obtained frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, converts the second digital signal into a corresponding electrical signal, and outputs the corresponding electrical signal to the vibration module.

[0123] S3, the vibration module is used to generate a second vibration signal based on the analyzed electrical signal, which is used to cancel each other out when the second vibration signal is superimposed on the first vibration signal, thereby reducing noise; wherein, the second vibration signal has the same frequency and amplitude as the first vibration signal but the opposite waveform, and the second digital signal has the same frequency and amplitude as the first digital signal but the opposite waveform.

[0124] As servers experience increased ambient temperature or excessive performance pressure during normal operation, they automatically adjust their rotation speed based on internal temperature conditions, resulting in changes in noise levels. The vibration acquisition module detects these changes in real time and uses the signal processing module to adjust the electrical signal corresponding to the second vibration signal to adapt to the constantly changing noise environment.

[0125] It should be noted that the technical solution of this invention only has a significant effect on regular and stable noise generated by the server, and will not reduce noise for daily staff communication and interaction.

[0126] An apparatus for active noise reduction in servers according to the present invention includes: a vibration acquisition module, a signal processing module, and a vibration module. The vibration acquisition module is used to acquire a first vibration signal that generates noise during the operation of the server fan module and send the first vibration signal to the signal processing module. The signal processing module converts the first vibration signal into a first digital signal based on the characteristic information of the first vibration signal, obtains the frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, generates a second digital signal based on the obtained frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, converts the second digital signal into a corresponding electrical signal, and outputs the corresponding electrical signal to the vibration module. The vibration module generates a second vibration signal, which cancels out the first vibration signal when the second vibration signal is superimposed, thereby reducing noise. The second vibration signal has the same frequency and amplitude as the first vibration signal but the opposite waveform, effectively solving the problem of low reliability or high cost of server fan noise reduction caused by existing technologies, effectively improving the reliability of server fan noise reduction and reducing the cost of server fan noise reduction.

[0127] In the technical solution of this invention, the vibration acquisition module is set at the bottom of the fan in the fan frame of the server fan module to ensure that the first vibration signal acquired is forwarded to the signal processing module; the vibration acquisition module includes multiple vibration sensors, and the position of each vibration sensor corresponds one-to-one with the position of the fan in the fan module to ensure accurate acquisition of the vibration signal that generates noise when the fan is running.

[0128] The signal processing module in this invention includes a first filtering submodule, a signal conversion submodule, a signal processing submodule, and a second filtering submodule that are connected in sequence. It can not only filter the first vibration signal acquired by the vibration acquisition module, but also filter the converted electrical signal, ensuring the comprehensiveness of the signal information, thereby improving the accuracy and reliability of the second vibration signal.

[0129] In the technical solution of this invention, the amplitude information of the filtered first vibration signal is the sum of the initial amplitude of the filtered first vibration signal and the amplitude difference between the two periods of the filtered first vibration signal. Compared with the vibration amplitude value in the traditional solution, the advantage is that it can capture the amplitude information and periodic information in the first vibration signal, that is, including amplitude and period, while the traditional solution only considers amplitude, ensuring the comprehensiveness of signal information and further improving the accuracy and reliability of the second vibration signal.

[0130] The vibration module described in the technical solution of this invention is disposed on both sides inside the chassis, and a soft wrapping layer is attached below the vibration module to avoid resonance between the vibration module and the server chassis. The vibration module converts the received electrical signal into a second vibration signal and transmits it to the chassis environment in a timely manner to achieve active noise reduction of the server. This not only does not affect the existing layout of the server, but also avoids resonance between the vibration module and the server chassis, thus effectively achieving active noise reduction of the server.

[0131] The technical solution of this invention can reduce noise pollution through active noise reduction, effectively reduce the frequency and intensity of sound, reduce noise interference, and help create a healthy and comfortable working environment for staff, facilitate easy and accurate communication, and improve work efficiency; moreover, it has a simple structure and low cost.

[0132] Example 3

[0133] The present invention also provides a server, including a device for active noise reduction of the server as described in Embodiment 1, that is, based on the existing server structure, the device for active noise reduction of the server as described in Embodiment 1 is added.

[0134] It should be noted that the technical solution of this invention only has a significant effect on regular and stable noise generated by the server, and will not reduce noise for daily staff communication and interaction.

[0135] An apparatus for active noise reduction in servers according to the present invention includes: a vibration acquisition module, a signal processing module, and a vibration module. The vibration acquisition module is used to acquire a first vibration signal that generates noise during the operation of the server fan module and send the first vibration signal to the signal processing module. The signal processing module converts the first vibration signal into a first digital signal based on the characteristic information of the first vibration signal, obtains the frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, generates a second digital signal based on the obtained frequency characteristics, amplitude characteristics, and phase characteristics of the first digital signal, converts the second digital signal into a corresponding electrical signal, and outputs the corresponding electrical signal to the vibration module. The vibration module generates a second vibration signal, which cancels out the first vibration signal when the second vibration signal is superimposed, thereby reducing noise. The second vibration signal has the same frequency and amplitude as the first vibration signal but the opposite waveform, effectively solving the problem of low reliability or high cost of server fan noise reduction caused by existing technologies, effectively improving the reliability of server fan noise reduction and reducing the cost of server fan noise reduction.

[0136] In the technical solution of this invention, the vibration acquisition module is set at the bottom of the fan in the fan frame of the server fan module to ensure that the first vibration signal acquired is forwarded to the signal processing module; the vibration acquisition module includes multiple vibration sensors, and the position of each vibration sensor corresponds one-to-one with the position of the fan in the fan module to ensure accurate acquisition of the vibration signal that generates noise when the fan is running.

[0137] The signal processing module in this invention includes a first filtering submodule, a signal conversion submodule, a signal processing submodule, and a second filtering submodule that are connected in sequence. It can not only filter the first vibration signal acquired by the vibration acquisition module, but also filter the converted electrical signal, ensuring the comprehensiveness of the signal information, thereby improving the accuracy and reliability of the second vibration signal.

[0138] In the technical solution of this invention, the amplitude information of the filtered first vibration signal is the sum of the initial amplitude of the filtered first vibration signal and the amplitude difference between the two periods of the filtered first vibration signal. Compared with the vibration amplitude value in the traditional solution, the advantage is that it can capture the amplitude information and periodic information in the first vibration signal, that is, including amplitude and period, while the traditional solution only considers amplitude, ensuring the comprehensiveness of signal information and further improving the accuracy and reliability of the second vibration signal.

[0139] The vibration module described in the technical solution of this invention is disposed on both sides inside the chassis, and a soft wrapping layer is attached below the vibration module to avoid resonance between the vibration module and the server chassis. The vibration module converts the received electrical signal into a second vibration signal and transmits it to the chassis environment in a timely manner to achieve active noise reduction of the server. This not only does not affect the existing layout of the server, but also avoids resonance between the vibration module and the server chassis, thus effectively achieving active noise reduction of the server.

[0140] The technical solution of this invention can reduce noise pollution through active noise reduction, effectively reduce the frequency and intensity of sound, reduce noise interference, and help create a healthy and comfortable working environment for staff, facilitate easy and accurate communication, and improve work efficiency; moreover, it has a simple structure and low cost.

[0141] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A device for active noise reduction on a server, characterized in that, The application relates to a server fan noise reduction device, which comprises a vibration collection module, a signal processing module and a vibration module. The vibration collection module is used for collecting a first vibration signal generated by noise of a server fan module during operation and transmitting the first vibration signal to the signal processing module; the signal processing module converts the first vibration signal into a first digital signal according to characteristic information of the first vibration signal, acquires frequency characteristics, amplitude characteristics and phase characteristics of the first digital signal, generates a second digital signal according to the frequency characteristics, the amplitude characteristics and the phase characteristics of the first digital signal, converts the second digital signal into a corresponding electric signal and outputs the corresponding electric signal to the vibration module; the vibration module is used for generating a second vibration signal according to the electric signal, and the second vibration signal and the first vibration signal are mutually offset when the second vibration signal and the first vibration signal are superimposed, so that noise is reduced; wherein the second vibration signal and the first vibration signal have the same frequency and amplitude but opposite waveforms, and the second digital signal and the first digital signal have the same frequency and amplitude but opposite waveforms. The signal processing module comprises a first filtering sub-module, a signal conversion sub-module and a second filtering sub-module which are sequentially connected in communication. The first filtering sub-module is connected in communication with the vibration collection module and is used for filtering the first vibration signal, specifically including: decomposing the input first vibration signal into a group of sine waves with different frequencies, combining the decomposed sine waves and filtering the combined first vibration signal. The signal conversion sub-module generates the first digital signal according to amplitude information, frequency information and phase information of the filtered first vibration signal, specifically including: The amplitude information of the filtered first vibration signal is the sum of an initial amplitude of the filtered first vibration signal and an amplitude difference of two periods before and after the filtered first vibration signal, which is used for capturing amplitude information and periodic information in the first vibration signal to ensure comprehensiveness of the first vibration signal information. The second filtering sub-module is used for filtering the converted electric signal and outputting the filtered electric signal to the vibration module.

2. The device for implementing server active noise reduction according to claim 1, characterized in that, The vibration collection module is arranged at the bottom of a fan frame of the server fan module to ensure that the first vibration signal collected is forwarded to the signal processing module. The vibration collection module comprises a plurality of vibration sensors, and the position of each vibration sensor corresponds to the position of a fan in the fan module.

3. The device for implementing server active noise reduction according to claim 1, characterized in that, The signal processing module further comprises a signal processing sub-module arranged between the signal conversion sub-module and the second filtering sub-module. The signal processing sub-module is used for acquiring the frequency characteristics, the amplitude characteristics and the phase characteristics of the first digital signal and generating the second digital signal according to the frequency characteristics, the amplitude characteristics and the phase characteristics of the first digital signal, and converting the second digital signal into the corresponding electric signal.

4. The device for implementing server active noise reduction according to claim 3, characterized in that, The signal processing sub-module is used for acquiring the frequency characteristics, the amplitude characteristics and the phase characteristics of the first digital signal and generating the second digital signal according to the frequency characteristics, the amplitude characteristics and the phase characteristics of the first digital signal, and converting the second digital signal into the corresponding electric signal. The signal processing submodule obtains the frequency characteristic, amplitude characteristic and phase characteristic of the first digital signal, and then shifts the waveform of the first digital signal B(t) to the right by one period while keeping the amplitude unchanged, so that the waveform obtained is the second digital signal C(t); The second digital signal C(t) is converted into a corresponding electrical signal D(t) according to the sampling rate and sampling interval of the second digital signal.

5. The device for implementing server active noise reduction according to claim 4, characterized in that, The vibration module analyzes the filtered electrical signal sent by the second filtering submodule, restores the second digital signal according to the filtered electrical signal, then restores the first digital signal according to the restored second digital signal, and generates a second vibration signal according to the restored first digital signal, which is used to cancel each other out when the second vibration signal and the first vibration signal are superimposed, thereby reducing noise.

6. The device for implementing server active noise reduction according to any one of claims 1-5, characterized in that, The vibration module includes a plurality of uniformly distributed vibrators, each of which corresponds to a vibration sensor, and the vibrators are arranged on both sides of the case inside the server cabinet, and a soft wrapping layer is attached below the vibrators to avoid resonance between the vibrators and the server cabinet.

7. A method for enabling active noise reduction by a server, the method comprising: Based on the device for actively reducing noise of a server according to any one of claims 1-6, comprising: The vibration acquisition module acquires the first vibration signal generated by the server fan module when running, and sends the first vibration signal to the signal processing module; The signal processing module converts the first vibration signal into a first digital signal according to the characteristic information of the first vibration signal, obtains the frequency characteristic, amplitude characteristic and phase characteristic of the first digital signal, and generates a second digital signal according to the frequency characteristic, amplitude characteristic and phase characteristic of the first digital signal, converts the second digital signal into a corresponding electrical signal, and outputs the corresponding electrical signal to the vibration module; The vibration module is used to finally generate a second vibration signal according to the analysis of the electrical signal, which is used to cancel each other out when the second vibration signal and the first vibration signal are superimposed, thereby reducing noise; wherein the frequency and amplitude of the second vibration signal and the first vibration signal are the same but the waveforms are opposite, and the frequency and amplitude of the second digital signal and the first digital signal are the same but the waveforms are opposite.

8. A server, characterized by The device for actively reducing noise of a server according to any one of claims 1-6.

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