Server having automatic noise reduction function and noise reduction method

Abstract

Provided in the present application are a server having automatic noise reduction function and a noise reduction method. The server comprises a hard disk module, a fan module and a fan noise reduction device. The fan noise reduction device is arranged on a fan wall bracket. A housing of the fan noise reduction device is provided with a plurality of through hole structures; the hole wall surface of each through hole structure is provided with an annular noise reduction cavity and two annular limiting grooves; two movable annular electromagnets are provided in each through hole structure; and two elastic members are provided in each through hole structure, the two elastic members being respectively located at the end faces of first axial ends of the two annular electromagnets and respectively located in the corresponding two annular limiting grooves, and the end faces of two axial ends of each elastic member respectively abutting against the groove wall surface of the annular limiting groove and the end face of a stop flange. Two noise sensors are respectively arranged on two hard disks. The present application solves the problem of the ways to achieve server noise reduction in the related art being limited to attaching sound-absorbing cotton or providing a passive noise reduction device on a noise transmission path.

Description

Servers with automatic noise reduction function and noise reduction methods

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411024990.2, filed on July 29, 2024, entitled "Server with Automatic Noise Reduction Function and Noise Reduction Method", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of server technology, and more specifically, to a server with automatic noise reduction function and a noise reduction method. Background Technology

[0004] HDD (Hard Disk Drive), also known as mechanical hard drive, mainly consists of several parts: platters, platter spindle, control motor, read / write heads, head arm, head controller, data converter, interface, cache, etc.

[0005] The read / write head can move along the radius of the disk platter. With the platter rotating at a high speed of several thousand revolutions per minute, the head can be positioned at a specific location on the platter to perform data read / write operations. Information is written to the disk by an electromagnetic current through the head, which is very close to the magnetic surface, by changing the polarity of the current. Information can also be read in the reverse manner.

[0006] As precision devices, hard disk drives (HDDs) are particularly sensitive to vibration. When external vibrations are transmitted to the HDD, the read / write head arm will vibrate slightly, causing seek errors and affecting the read / write speed of the HDD. In severe cases, the drive may even fail to load.

[0007] Numerous studies have shown that the main vibration excitation that causes the degraded read and write performance of mechanical hard drives comes from the high-frequency noise generated by the server fan. The fan noise radiates to the surface of the mechanical hard drive and induces acoustic-vibration coupling vibration.

[0008] Currently, the main solution to the hard drive read / write speed degradation problem is to reduce noise along the noise transmission path, specifically by applying sound-absorbing cotton along the fan noise radiation propagation path. For example, inside a server chassis, sound-absorbing cotton is applied to the space between the fan module and the hard drive module, such as the chassis base, side walls, and hard drive backplate. However, different chassis have different noise transmission paths, requiring different locations and thicknesses of sound-absorbing cotton, necessitating repeated experimentation and adjustments, which consumes a significant amount of time.

[0009] In addition, some related technologies achieve sound insulation and noise reduction by installing a silencer at the front end of the fan frame. However, this type of silencer is a reactive silencer, which requires specific dimensional design to prevent noise of a specific frequency from passing through. On the other hand, once the size of a passive silencer is determined, it can only silence specific frequencies, and will lose its silencing effect if the noise frequency changes. Summary of the Invention

[0010] The main objective of this application is to provide a server with automatic noise reduction function and a noise reduction method, so as to solve the problem that the noise reduction of servers in related technologies can only be achieved by pasting sound-absorbing cotton or setting up passive noise reduction devices in the noise transmission path.

[0011] To achieve the above objectives, according to the first aspect of this application, a server with automatic noise reduction function is provided, including a hard disk module, a fan module, and a fan noise reduction device. The hard disk module has multiple hard disks; the fan module is arranged opposite to the hard disk module, and the fan module includes a fan wall bracket and multiple fans, which are arranged on the fan wall bracket and correspond one-to-one with the multiple hard disks; the fan noise reduction device is arranged on the fan wall bracket and located between the fan module and the hard disk module; wherein, the fan noise reduction device includes a housing, two noise sensors, and a control system, the housing has multiple through-hole structures, which correspond one-to-one with the multiple fans, and the wall surface of each through-hole structure has an annular noise reduction cavity and two annular limiting grooves, which are located at the two axial ends of the annular noise reduction cavity respectively; each through-hole structure is provided with two annular electromagnets, which are arranged opposite to each other along the axial direction of the through-hole structure, and each annular electromagnet has a stop at its first axial end. The system includes a stop flange, with each stop flange correspondingly positioned within its respective annular limiting groove. An annular connecting groove is formed between the axial second ends of two annular electromagnets, located at the opening of the annular silencing cavity, connecting the annular silencing cavity to the through-hole of the annular electromagnet. Each via structure contains two elastic elements, each located at the end face of the axial first end of one of the two annular electromagnets and within its corresponding annular limiting groove. The end faces of both axial ends of each elastic element abut against the groove wall of the annular limiting groove and the end face of the stop flange, respectively. Two noise sensors are respectively mounted on two hard drives to acquire real-time noise signals at their respective locations. The control system has a main control program, including an inference model and a control algorithm. The inference model calculates the real-time noise signals at the remaining hard drives based on the two real-time noise signals, while the control algorithm calculates the required current I to be supplied to the two annular electromagnets within each via structure based on the real-time noise signals. r When a current I is passed through two annular electromagnets within the same via structure... rSubsequently, the two annular electromagnets move a distance w / 2 away from each other, and simultaneously, the elastic element on the corresponding side contracts a distance w / 2. This allows the natural frequency f of the annular silencing cavity to be changed by adjusting the width w of the annular connecting groove, thus addressing different fan noise frequencies f. HDD Eliminate it.

[0012] In some implementations, the two noise sensors are located on the hard drives at opposite corners of the hard drive module.

[0013] In some implementations, the two annular limiting grooves are symmetrically arranged about the annular silencing cavity.

[0014] In some embodiments, each through-hole structure has two annular limiting bosses protruding from its hole wall, and an annular silencing cavity is formed between the two annular limiting bosses.

[0015] In some embodiments, the via structure sequentially includes a first via segment, a silencing via segment, and a second via segment, wherein the diameter of the first via segment and the diameter of the second via segment are both smaller than the diameter of the silencing via segment, so that a first stop annular surface is formed at the connection between the first via segment and the silencing via segment, and a second stop annular surface is formed at the connection between the second via segment and the silencing via segment; a first annular limiting boss is formed between the first stop annular surface and the first stop annular surface, and a second annular limiting boss is formed between the second stop annular surface and the second stop annular surface.

[0016] In some implementations, the diameter of the first aperture segment is equal to the diameter of the second aperture segment.

[0017] In some embodiments, the inner diameter of the elastic element is equal to the diameter of the through hole of the annular electromagnet.

[0018] In some embodiments, the inner ring diameter of the elastic element is equal to the diameter of the first hole segment.

[0019] In some embodiments, the diameter of the first hole segment is equal to the diameter of the second hole segment; the inner ring diameter of the elastic element is equal to the diameter of the through hole of the annular electromagnet; and the inner ring diameter of the elastic element is equal to the diameter of the first hole segment.

[0020] In some implementations, the elastic element is a rubber ring.

[0021] In some implementations, the enclosure is detachably connected to the fan wall bracket.

[0022] In some embodiments, the side of the enclosure facing the fan wall bracket also has a flange structure with a first mounting hole on the flange structure. The fan wall bracket has a second mounting hole at the position opposite to the first mounting hole. The server also includes fasteners that pass through the first mounting hole and the second mounting hole in sequence to connect the enclosure and the fan wall bracket.

[0023] In some implementations, the inference model is a neural network-based AI inference model with 2 inputs and N outputs, where the 2 inputs are two real-time noise signals acquired by two noise sensors, and N depends on the number of hard drives.

[0024] In some implementations, the noise sensor is a miniature microphone.

[0025] According to a second aspect of this application, a noise reduction method for a server is provided. The server is the aforementioned server. The noise reduction method includes step S1, where two noise sensors located on the hard disk module acquire real-time noise signals at two corresponding hard disks, and the server's main control program calls an inference model based on the real-time noise signals, and calculates the real-time noise signals at the remaining hard disks in the hard disk module based on the inference model; step S2, where the control algorithm in the main control program calculates the current I that needs to be passed through the two annular electromagnets in each corresponding via structure based on each real-time noise signal. r Among them, when a current I is passed through two annular electromagnets within the same through-hole structure... r Subsequently, the two annular electromagnets move a distance w / 2 away from each other, and simultaneously, the elastic element on the corresponding side contracts a distance w / 2. This allows the natural frequency f of the annular silencing cavity to be changed by adjusting the width w of the annular connecting groove, thus addressing different fan noise frequencies f. HDD Eliminate it.

[0026] In some implementations, in step S2, the control algorithm includes:

[0027] Step S20: Perform Fourier transform on each real-time noise signal to obtain the PSD spectrum p0(f) of the real-time noise signal. Look up the noise sensitivity parameters P0(f) and K(f) of the hard disk module. Within the frequency range [fl, fu], apply the formula... The index of hard drive read / write performance degradation within each frequency band is obtained, and the maximum sensitive frequency f that causes the hard drive read / write performance degradation is found based on Δ(f). max And the maximum sensitive frequency f max The fan noise frequency f that needs to be eliminated HDD ;

[0028] Step S21, based on the natural frequency f of the annular anechoic cavity and the fan noise frequency f HDD The condition for equality, according to the formula If the width w of the annular connecting groove between the two annular electromagnets is calculated, then the contraction distance of the elastic element on the corresponding side of the two annular electromagnets is w / 2.

[0029] Among them, C b The acoustic volume of the annular anechoic cavity. V is the volume of the annular anechoic chamber, ρ0 is the air density, and c0 is the speed of sound;

[0030] M b Let M be the equivalent acoustic mass of the annular anechoic cavity. b =ρ0a / S h , where a is the thickness of the wall of the annular connecting groove, and S h Let be the cross-sectional area of ​​the annular connecting groove;

[0031] According to the formula w = S h The groove width w is obtained by calculating / 2πR, where R is the groove radius of the annular connected groove;

[0032] Step S22: Based on the contraction distance w / 2 and the formula Fg=K×w / 2, where K is the stiffness of the elastic element, calculate the electromagnetic force F required for the annular electromagnet. g Then, according to the magnetic induction intensity formula Fg=Bn 2 ×S / μ0, Bn=μ0×N×I r / L, where μ0 is the free permeability, N is the number of turns of the coil, L is the length of the coil, and S is the cross-sectional area of ​​the toroidal electromagnet in the direction of movement. The required current I for the toroidal electromagnet is then calculated. r ;

[0033] Step S23, the main control program calculates the current I based on step S22. r After being converted from digital to analog, the circular electromagnet moves to the corresponding position according to the signal, causing a change in the slot width w in step S21. This further causes a corresponding change in the natural frequency f of the circular silencing cavity to adapt to different fan noise frequencies. HDD .

[0034] In some implementations, before step S1, the noise reduction method further includes step S0: determining the noise transmission path H(jw) of the fan based on the overall height and width of the server, and the distance between the fan wall bracket and the backplane of the hard drive module; determining the noise source P(x,y,z,t) based on the fan's brand, specifications, and speed; determining the noise at the far-field location based on the formula p=P(x,y,z,t)×H(jw); training the inference model using multiple test data; and after completing the training of the inference model, embedding the inference model into the main control program for use by the main control program.

[0035] By applying the technical solution of this application, the fan silencing device is installed on the fan wall bracket and located between the fan module and the hard drive module. At the same time, the enclosure has multiple through-hole structures, which are arranged one-to-one with multiple fans. The hole wall of each through-hole structure has an annular silencing cavity and two annular limiting grooves. The two annular limiting grooves are located at the two axial ends of the annular silencing cavity. Two annular electromagnets are installed in each through-hole structure. The two annular electromagnets are arranged opposite each other along the axial direction of the through-hole structure. The first axial end of each annular electromagnet has a stop flange, which is correspondingly set in each annular limiting groove. An annular connecting groove is formed between the second axial ends of the two annular electromagnets. The annular connecting groove is located at the cavity opening of the annular silencing cavity, so that the annular connecting groove connects the annular silencing cavity and the through hole of the annular electromagnet.

[0036] Each through-hole structure is equipped with two elastic elements. The two elastic elements are located at the end faces of the first axial end of the two annular electromagnets, and are respectively located in the two corresponding annular limiting grooves. The end faces of the two ends of each elastic element abut against the groove wall of the annular limiting groove and the end face of the stop flange, respectively.

[0037] In some implementations, two noise sensors are respectively mounted on two hard drives to acquire real-time noise signals at the corresponding two hard drives.

[0038] In some implementations, the control system has a master control program, which includes an inference model and a control algorithm. The inference model calculates the real-time noise signals at the remaining hard drives based on two real-time noise signals, and the control algorithm calculates the required current I to be supplied to the two annular electromagnets in each corresponding via structure based on each real-time noise signal. r ;

[0039] Specifically, when a current I is passed through two annular electromagnets within the same via structure... r Subsequently, the two annular electromagnets move a distance w / 2 away from each other, and simultaneously, the elastic element on the corresponding side contracts a distance w / 2. This allows the natural frequency f of the annular silencing cavity to be changed by adjusting the width w of the annular connecting groove, thus addressing different fan noise frequencies f. HDD Eliminate it.

[0040] In summary, this application, without changing the overall dimensions of the fan silencing device, achieves the purpose of altering the natural frequency f of the annular silencing cavity by setting two movable annular electromagnets, thereby changing the groove width w of the annular connecting slot between the two annular electromagnets. This allows for the control of different fan noise frequencies f. HDD Eliminate it. Attached Figure Description

[0041] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0042] Figure 1 shows a schematic diagram of a server fan silencing device located between a fan module and a hard disk module according to an optional embodiment of the present application;

[0043] Figure 2 shows a schematic diagram of the housing of the fan silencer in Figure 1;

[0044] Figure 3 shows a schematic diagram of the fan silencing device in Figure 2 from a frontal view.

[0045] Figure 4 shows a schematic cross-sectional view of the structure at point AA in Figure 3;

[0046] Figure 5 shows a flowchart of the server noise reduction method.

[0047] The above-mentioned figures include the following reference numerals: 10, hard disk module; 11, hard disk; 20, fan module; 21, fan wall bracket; 30, fan silencing device; 31, housing; 311, flange structure; 312, first mounting hole; 32, through hole structure; 321, annular silencing cavity; 322, annular limiting groove; 323, annular limiting boss; 324, first hole segment; 325, silencing hole segment; 326, second hole segment; 33, annular electromagnet; 331, stop flange; 100, annular connecting groove; 34, elastic element; 35, noise sensor. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0049] To address the issue that server noise reduction in related technologies can only be achieved by attaching sound-absorbing cotton or setting up passive noise reduction devices along the noise transmission path, this application provides a server with automatic noise reduction function and a noise reduction method.

[0050] As shown in Figures 1 to 4, the server with automatic noise reduction function includes a hard disk module 10, a fan module 20, and a fan noise reduction device 30. The hard disk module 10 has multiple hard disks 11. The fan module 20 is arranged opposite to the hard disk module 10. The fan module 20 includes a fan wall bracket 21 and multiple fans. The multiple fans are arranged on the fan wall bracket 21, and each fan corresponds to one of the multiple hard disks 11. The fan noise reduction device 30 is arranged on the fan wall bracket 21 and is located between the fan module 20 and the hard disk module 10.

[0051] The fan noise reduction device 30 includes a housing 31, two noise sensors 35, and a control system. The housing 31 has multiple through-hole structures 32, each corresponding to a fan. Each through-hole structure 32 has an annular noise reduction cavity 321 and two annular limiting grooves 322 on its wall surface. The two annular limiting grooves 322 are located at opposite ends of the annular noise reduction cavity 321. Two annular electromagnets 33 are installed within each through-hole structure 32, positioned opposite each other along the axial direction of the through-hole structure 32. Each annular electromagnet 33 has a stop flange 331 at its first axial end, which is correspondingly located within each annular limiting groove 322. An annular connecting groove 100 is formed between the second axial ends of the two annular electromagnets 33. The annular connecting groove 100 is located at the opening of the annular noise reduction cavity 321, allowing the annular connecting groove 100 to... A through hole connects the annular silencing cavity 321 and the annular electromagnet 33; each through hole structure 32 is provided with two elastic elements 34, which are located at the end faces of the first axial ends of the two annular electromagnets 33, and are respectively located in the two corresponding annular limiting grooves 322. The end faces of the two axial ends of each elastic element 34 abut against the groove wall surface of the annular limiting groove 322 and the end face of the stop flange 331, respectively; two noise sensors 35 are respectively installed on the two hard disks 11 to acquire the real-time noise signals at the corresponding two hard disks 11; the control system has a main control program, which includes an inference model and a control algorithm. The inference model calculates the real-time noise signals at the other hard disks 11 based on the two real-time noise signals, and the control algorithm calculates the current I that needs to be passed through the two annular electromagnets 33 in each through hole structure 32 based on each real-time noise signal. r When a current I is passed through the two annular electromagnets 33 within the same through-hole structure 32 r Subsequently, the two annular electromagnets 33 move away from each other by a distance w / 2, and simultaneously, the corresponding elastic element 34 contracts by a distance w / 2. This changes the natural frequency f of the annular silencing cavity 321 by adjusting the width w of the annular connecting groove 100, thereby addressing different fan noise frequencies f. HDD Eliminate it.

[0052] By setting the fan silencing device 30 on the fan wall bracket 21 and between the fan module 20 and the hard disk module 10, and the enclosure 31 having multiple through-hole structures 32, each of which corresponds to a fan, the wall surface of each through-hole structure 32 has an annular silencing cavity 321 and two annular limiting grooves 322. The two annular limiting grooves 322 are located at the two axial ends of the annular silencing cavity 321, and two annular electromagnets 33 are set in each through-hole structure 32. The two annular electromagnets 33 are arranged opposite each other along the axial direction of the through-hole structure 32, and each annular electromagnet 33 has a stop flange 331 at its first axial end. Each stop flange 331 is correspondingly set in each annular limiting groove 322. An annular connecting groove 100 is formed between the second axial ends of the two annular electromagnets 33. The annular connecting groove 100 is located at the cavity opening of the annular silencing cavity 321, so that the annular connecting groove 100 connects the annular silencing cavity 321 and the through hole of the annular electromagnet 33.

[0053] Each through hole structure 32 is provided with two elastic elements 34. The two elastic elements 34 are located at the end face of the first axial end of the two annular electromagnets 33, and are located in the corresponding two annular limiting grooves 322. The end faces of the two ends of each elastic element 34 abut against the groove wall surface of the annular limiting groove 322 and the end face of the stop flange 331, respectively.

[0054] Furthermore, two noise sensors 35 are respectively installed on the two hard disks 11 to acquire the real-time noise signals at the corresponding two hard disks 11.

[0055] Furthermore, the control system has a main control program, which includes an inference model and a control algorithm. The inference model calculates the real-time noise signals at the remaining hard disks 11 based on two real-time noise signals. The control algorithm calculates the current I that needs to be supplied to the two annular electromagnets 33 in each corresponding via structure 32 based on each real-time noise signal. r ;

[0056] Specifically, when a current I is passed into the two annular electromagnets 33 within the same through-hole structure 32 r Subsequently, the two annular electromagnets 33 move away from each other by a distance w / 2, and simultaneously, the corresponding elastic element 34 contracts by a distance w / 2. This changes the natural frequency f of the annular silencing cavity 321 by adjusting the width w of the annular connecting groove 100, thereby addressing different fan noise frequencies f. HDD Eliminate it.

[0057] In summary, this application, without changing the overall dimensions of the fan silencing device 30, achieves the purpose of changing the natural frequency f of the annular silencing cavity 321 by setting two movable annular electromagnets 33, thereby altering the groove width w of the annular connecting groove 100 between the two annular electromagnets 33. This allows for the control of different fan noise frequencies f. HDD Eliminate it.

[0058] It should be noted that in this application, the natural frequency f of the annular anechoic cavity 321 and the fan noise frequency f are used. HDD Under equal conditions, when fan noise passes through the annular silencing cavity 321, the fan noise to be eliminated and the air inside the annular silencing cavity 321 resonate. This resonance causes the amplitude of the air vibration inside the annular silencing cavity 321 to reach its maximum, thus forming an air wall. This air wall can impede the frequency f of the fan noise to be eliminated. HDD The sound waves pass through, and the natural frequency f of the annular anechoic cavity 321 in this application can be determined based on the fan noise frequency f. HDD The system then adapts accordingly, thereby achieving the goal of eliminating noise at different frequencies.

[0059] Furthermore, the fan silencing device 30 provided in this application only needs to be connected to the fan wall bracket 21. There is no need to use sound-absorbing cotton, nor is it necessary to repeatedly experiment and adjust the pasting position and thickness of the sound-absorbing cotton on the noise transmission path. The fan silencing device 30 provided in this application can accurately silencing noise, greatly improving the silencing efficiency of the fan silencing device 30, which is beneficial to improving the read and write performance of the hard drive 11.

[0060] It should be noted that, in this application, in order to consider the economic efficiency of the server provided by this application and to save costs, the two noise sensors 35 are respectively located on the hard disks 11 at two opposite corners of the hard disk module 10.

[0061] In some embodiments, one of the two noise sensors 35 is located on the first hard disk 11 at the upper right of the first row in Figure 1, and the other of the two noise sensors 35 is located on the first hard disk 11 at the lower left of the second row in Figure 1.

[0062] In some embodiments, the two annular limiting grooves 322 are symmetrically arranged about the annular silencing cavity 321.

[0063] As shown in Figure 4, each through hole structure 32 has two annular limiting bosses 323 protruding from the hole wall, and an annular silencing cavity 321 is formed between the two annular limiting bosses 323.

[0064] As shown in Figure 4, the through-hole structure 32 sequentially includes a first through-hole section 324, a sound-absorbing through-hole section 325, and a second through-hole section 326. The diameters of the first through-hole section 324 and the second through-hole section 326 are both smaller than the diameter of the sound-absorbing through-hole section 325, so that a first stop annular surface is formed at the connection between the first through-hole section 324 and the sound-absorbing through-hole section 325, and a second stop annular surface is formed at the connection between the second through-hole section 326 and the sound-absorbing through-hole section 325. A first annular limiting boss 323 forms a first annular limiting groove 322 between itself and the first stop annular surface, and a second annular limiting boss 323 forms a second annular limiting groove 322 between itself and the second stop annular surface. In this way, by setting the through-hole structure 32 to include the first through-hole section 324, the sound-absorbing through-hole section 325, and the second through-hole section 326 sequentially, the ease of processing of the housing 31 and the reliability of the sound absorption of the housing 31 are ensured.

[0065] As shown in Figure 4, Figure 4 is a cross-sectional view of the structure from the perspective of AA in Figure 3. In order to clearly show the specific structure of the through hole structure 32, the two elastic elements 34 and the two annular electromagnets 33 in the upper through hole structure 32 are omitted in the figure, while the two elastic elements 34 and the two annular electromagnets 33 in the lower through hole structure 32 are still retained for comparison.

[0066] In some embodiments, the aperture of the first aperture segment 324 is equal to the aperture of the second aperture segment 326.

[0067] In some embodiments, the inner diameter of the elastic element 34 is equal to the diameter of the through hole of the annular electromagnet 33.

[0068] In some embodiments, the inner ring diameter of the elastic element 34 is equal to the diameter of the first hole segment 324.

[0069] It should be noted that, in one embodiment of this application, the diameter of the first hole segment 324 is equal to the diameter of the second hole segment 326; the inner ring diameter of the elastic element 34 is equal to the diameter of the through hole of the annular electromagnet 33; and the inner ring diameter of the elastic element 34 is equal to the diameter of the first hole segment 324.

[0070] In some embodiments, the elastic element 34 is a rubber ring.

[0071] In some embodiments, the housing 31 is detachably connected to the fan wall bracket 21. This ensures that the housing 31 is easy to assemble and disassemble.

[0072] As shown in Figures 1 to 3, the side of the enclosure 31 facing the fan wall bracket 21 also has a flange structure 311. The flange structure 311 has a first mounting hole 312. The fan wall bracket 21 has a second mounting hole at the position opposite to the first mounting hole 312. The server also includes fasteners. The fasteners pass through the first mounting hole 312 and the second mounting hole in sequence to connect the enclosure 31 and the fan wall bracket 21.

[0073] In some embodiments, the inference model is a neural network-based AI inference model with 2 inputs and N outputs, wherein the 2 inputs are two real-time noise signals acquired by two noise sensors 35, and N depends on the number of hard disks 11.

[0074] In some embodiments, the noise sensor 35 is a miniature microphone.

[0075] As shown in Figure 5, the noise reduction methods for the server are as described above and below. The noise reduction methods include:

[0076] In step S1, the two noise sensors 35 located on the hard disk module 10 acquire the real-time noise signals at the corresponding two hard disks 11. The server's main control program calls the inference model based on the real-time noise signals and calculates the real-time noise signals at the remaining hard disks 11 of the hard disk module 10 based on the inference model.

[0077] Step S2: The control algorithm in the main control program calculates the current I that needs to be supplied to the two annular electromagnets 33 in each via structure 32 based on the real-time noise signals. r ;

[0078] When a current I is passed through the two annular electromagnets 33 within the same through-hole structure 32, r Subsequently, the two annular electromagnets 33 move away from each other by a distance w / 2, and simultaneously, the corresponding elastic element 34 contracts by a distance w / 2. This changes the natural frequency f of the annular silencing cavity 321 by adjusting the width w of the annular connecting groove 100, thereby addressing different fan noise frequencies f. HDD Eliminate it.

[0079] Further, in step S2, the control algorithm includes:

[0080] Step S20: Perform Fourier transform on each real-time noise signal to obtain the PSD spectrum p0(f) of the real-time noise signal. Query the noise sensitivity parameters P0(f) and K(f) of the hard disk module 10. Within the frequency range [fl, fu], apply the formula... The performance degradation index of hard drive 11 in each frequency band was obtained, and the maximum sensitive frequency f that caused the performance degradation of hard drive 11 was found based on Δ(f). max And the maximum sensitive frequency fmax The fan noise frequency f that needs to be eliminated HDD ;

[0081] Step S21, based on the natural frequency f of the annular anechoic cavity 321 and the fan noise frequency f HDD The condition for equality, according to the formula If the groove width w of the annular connecting groove 100 between the two annular electromagnets 33 is calculated, then the contraction distance of the elastic element 34 on the corresponding side of the two annular electromagnets 33 is w / 2.

[0082] Among them, C b The acoustic volume of the annular anechoic cavity 321 V is the volume of the annular anechoic cavity 321, ρ0 is the air density, and c0 is the speed of sound;

[0083] M b The equivalent acoustic mass of the annular anechoic cavity 321 is M. b =ρ0a / S h , where a is the thickness of the wall of the annular connecting groove 100, and S h Let be the cross-sectional area of ​​the annular connecting groove 100;

[0084] According to the formula w = S h The groove width w is obtained by calculating / 2πR, where R is the groove radius of the annular connecting groove 100;

[0085] Step S22: Based on the contraction distance w / 2 and the formula Fg=K×w / 2, where K is the stiffness of the elastic element 34, the electromagnetic force F required for the annular electromagnet 33 is calculated. g Then, according to the magnetic induction intensity formula Fg=Bn 2 ×S / μ0, Bn=μ0×N×I r / L, where μ0 is the free permeability, N is the number of turns of the coil, L is the length of the coil, and S is the cross-sectional area of ​​the toroidal electromagnet 33 in the direction of movement. The required current I for the toroidal electromagnet 33 is calculated. r ;

[0086] Step S23, the main control program calculates the current I based on step S22. r After being converted from digital to analog, the annular electromagnet 33 moves to the corresponding position according to the movement signal, causing a change in the slot width w in step S21, which in turn causes a corresponding change in the natural frequency f of the annular silencing cavity 321 to adapt to different fan noise frequencies f. HDD .

[0087] Furthermore, prior to step S1, the noise reduction method also includes:

[0088] Step S0: Determine the noise transmission path H(jw) of the fan based on the overall height and width of the server, as well as the distance between the fan wall bracket 21 and the backplate of the hard disk module 10.

[0089] The source of the noise, P(x,y,z,t), is determined based on the fan's brand, specifications, and speed.

[0090] The noise at the far-field position is determined using the formula p = P(x,y,z,t) × H(jw);

[0091] The inference model is trained using multiple test data sets. After training, the inference model is embedded into the main control program for use by the main control program.

[0092] It should be noted that the PSD (Power Spectral Density) in the PSD spectrum p0(f) of the real-time noise signal mentioned above represents the signal power density at each frequency point in the noise signal, and its integration can be represented as the power of that segment of the noise signal.

[0093] It should be noted that R mentioned above is the groove radius of the annular connecting groove 100, and the groove radius here does not take into account the thickness a of the groove wall of the annular connecting groove 100.

[0094] It should be noted that, in this application, the specifications in the aforementioned fan brand, specifications, and speed can be the fan size, current, voltage, number of blades, etc.

[0095] It should be noted that, in this application, the test data mentioned above, in the phrase "training the inference model using multiple test data sets, and then embedding the inference model into the main control program for the main control program to call," refers to model training data. Its purpose is to determine the various parameters of the model through training, which can be understood as the constant terms of a function. Once the function is determined, inputting another piece of data (which can be considered the independent variable) to the function will automatically calculate the other data (which can be considered the dependent variable).

[0096] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0097] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0098] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0099] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0100] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0101] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A server having an automatic muting function, characterized by comprising: The application relates to a hard disk module (10) and a fan module (20) for the hard disk module (10). The fan module (20) is arranged opposite to the hard disk module (10), and comprises a fan wall support (21) and a plurality of fans arranged on the fan wall support (21) and corresponding to the plurality of hard disks (11). A fan noise elimination device (30) is arranged on the fan wall support (21) and between the fan module (20) and the hard disk module (10). The fan noise elimination device (30) comprises a box body (31) with a plurality of through-hole structures (32) corresponding to the plurality of fans. Each through-hole structure (32) is provided with two annular limit grooves (322) at the axial two ends of the annular noise elimination cavity (321). Each through-hole structure (32) is provided with two annular electromagnets (33) arranged opposite along the axial direction of the through-hole structure (32), and the axial first end of each annular electromagnet (33) is provided with a stopper flange (331) arranged in the corresponding annular limit groove (322). The axial second ends of the two annular electromagnets (33) form an annular communication groove (100) at the cavity opening of the annular noise elimination cavity (321), so that the annular communication groove (100) communicates the annular noise elimination cavity (321) and the through hole of the annular electromagnet (33). Each through-hole structure (32) is provided with two elastic members (34) arranged at the end faces of the axial first ends of the two annular electromagnets (33) and in the corresponding two annular limit grooves (322). Two noise sensors (35) are arranged on the two hard disks (11) respectively to acquire real-time noise signals at the two hard disks (11) respectively. A control system has a main program, which includes an inference model and a control algorithm, the inference model calculates the real-time noise signals at the rest of the hard disks (11) according to two of the real-time noise signals, and the control algorithm calculates the current I required to be passed through the two annular electromagnets (33) in each of the via structures (32) according to each of the real-time noise signals r ; When the electric current I is passed to two said annular electromagnets (33) in the same said via hole structure (32) r After that, the two said annular electromagnets (33) move away from each other by a distance of w / 2, and the corresponding side said elastic member (34) is contracted by a distance of w / 2, so as to change the self-vibration frequency f of the annular sound elimination cavity (321) by adjusting the slot width w of the annular communication slot (100), so as to eliminate different fan noise frequencies f HDD .

2. The server of claim 1, wherein, The two noise sensors (35) are arranged on the hard disks (11) at the two opposite corners of the hard disk module (10) respectively.

3. The server of claim 1, wherein, The two annular limit grooves (322) are symmetrically arranged about the annular noise elimination cavity (321).

4. The server of claim 1, wherein, The hole wall surface of each through-hole structure (32) is provided with two annular limit bosses (323) protruding therefrom, and the annular noise elimination cavity (321) is formed between the two annular limit bosses (323).

5. The server of claim 4, wherein, The via structure (32) comprises a first hole section (324), a sound hole section (325) and a second hole section (326) in sequence, the hole diameter of the first hole section (324) and the hole diameter of the second hole section (326) are both smaller than the hole diameter of the sound hole section (325), so that a first stop annular surface is formed at the connection between the first hole section (324) and the sound hole section (325), and a second stop annular surface is formed at the connection between the second hole section (326) and the sound hole section (325). A first annular limiting groove (322) is formed between the first annular limiting boss (323) and the first stop annular surface, and a second annular limiting groove (322) is formed between the second annular limiting boss (323) and the second stop annular surface.

6. The server of claim 5, wherein, The hole diameter of the first hole section (324) is equal to the hole diameter of the second hole section (326).

7. The server of claim 5, wherein, The inner ring hole diameter of the elastic member (34) is equal to the hole diameter of the through hole of the annular electromagnet (33).

8. The server of claim 5, wherein, The inner ring hole diameter of the elastic member (34) is equal to the hole diameter of the first hole section (324).

9. The server of claim 5, wherein The hole diameter of the first hole section (324) is equal to the hole diameter of the second hole section (326). The inner ring hole diameter of the elastic member (34) is equal to the hole diameter of the through hole of the annular electromagnet (33). The inner ring hole diameter of the elastic member (34) is equal to the hole diameter of the first hole section (324).

10. The server of claim 5, wherein The hole diameter of the first hole section (324) is equal to the hole diameter of the second hole section (326). The inner ring hole diameter of the elastic member (34) is equal to the hole diameter of the through hole of the annular electromagnet (33).

11. The server of claim 5, wherein The hole diameter of the first hole section (324) is equal to the hole diameter of the second hole section (326). The inner ring hole diameter of the elastic member (34) is equal to the hole diameter of the first hole section (324).

12. The server of claim 5, wherein The inner ring hole diameter of the elastic member (34) is equal to the hole diameter of the through hole of the annular electromagnet (33). The inner ring hole diameter of the elastic member (34) is equal to the hole diameter of the first hole section (324).

13. The server of any one of claims 1 to 12, wherein, The elastic member (34) is a rubber ring.

14. The server of any one of claims 1 to 12, wherein, The box body (31) is detachably connected with the fan wall support (21).

15. The server of claim 14, wherein, The side of the box body (31) facing the fan wall support (21) further has a flanging structure (311) with a first assembly hole (312) formed thereon, the fan wall support (21) has a second assembly hole at a position opposite to the first assembly hole (312), and the server further comprises a fastener which passes through the first assembly hole (312) and the second assembly hole in sequence to connect the box body (31) and the fan wall support (21).

16. The server of any one of claims 1 to 12, wherein, The inference model is a neural network-based AI inference model with 2 inputs and N outputs, wherein the 2 inputs are two real-time noise signals obtained by two noise sensors (35), and N depends on the number of hard disks (11).

17. The server of any one of claims 1 to 12, wherein, The noise sensor (35) is a micro microphone.

18. A method of muting a server, the method comprising: The server is the server of any one of claims 1 to 17, and the noise elimination method comprises: Step S1, two noise sensors (35) located on the hard disk module (10) obtain real-time noise signals at the corresponding two hard disks (11), and the main control program of the server calls an inference model according to the real-time noise signals and calculates real-time noise signals at the remaining hard disks (11) of the hard disk module (10) according to the inference model; Step S2, the control algorithm in the host program calculates the current I required to be passed through the two annular electromagnets (33) in each of the via structures (32) according to each of the real-time noise signals r ; Wherein, when the electric current I is passed to two said annular electromagnets (33) in the same said via structure (32) r After that, the two said annular electromagnets (33) move away from each other by a distance of w / 2, and the corresponding side said elastic member (34) is contracted by a distance of w / 2, so as to change the self-vibration frequency f of the annular sound elimination cavity (321) by adjusting the slot width w of the annular communication slot (100), so as to eliminate different fan noise frequencies f HDD ​ 19. The method of claim 18, wherein, In the step S2, the control algorithm comprises: Step S20, Fourier transform is respectively carried out to each real-time noise signal, and the PSD spectrum p0 (f) of the real-time noise signal is obtained, the noise sensitivity parameters P0 (f) and K (f) of the hard disk module (10) are inquired, and in the frequency band interval range [fl, fu] according to the formula an index of the read / write performance of the hard disk (11) in each frequency band is derived, and the maximum sensitive frequency f causing the read / write performance of the hard disk (11) to decrease is found based on Δ(f) max , and the maximum sensitive frequency f max is set as the fan noise frequency f HDD to be eliminated Step S21, based on the ring-shaped sound-absorbing cavity (321) of the natural frequency f and the fan noise frequency f HDD Equal conditions, according to the formula The slot width w of the annular communication slot (100) between the two annular electromagnets (33) is calculated, and the contraction distance of the elastic member (34) corresponding to the two annular electromagnets (33) is w / 2; wherein C b is the acoustic volume of the annular sound deadening chamber (321), V is the volume of the annular noise elimination cavity (321), ρ0 is the air density, and c0 is the sound speed; M b M is the equivalent acoustic mass of the annular muffling cavity (321) b = p0a / S h , a is the thickness of the slot wall of the annular communication slot (100), S h is the slot cross-sectional area of the annular communication slot (100); According to the formula w = S h / 2πR, where R is the slot radius of the annular communication slot (100), the slot width w is calculated. Step S22, according to the contraction distance w / 2, and combined with the formula Fg=K×w / 2, wherein K is the stiffness of the elastic member (34), the electromagnetic force F required by the annular electromagnet (33) is calculated g , and according to the magnetic induction intensity formula Fg=Bn 2 ×S / μ0, Bn=μ0×N×I r / L, wherein μ0 is the vacuum permeability, N is the number of turns of the coil, L is the length of the coil, and S is the cross-sectional area of the annular electromagnet (33) in the moving direction, the current I required by the annular electromagnet (33) is calculated r ; Step S23, the host program according to the step S22 calculated the current I r Through digital-analog conversion into the moving signal of the ring-shaped electromagnet (33), the ring-shaped electromagnet (33) moves to the corresponding position according to the moving signal, so that the slot width w in the step S21 changes, further makes the natural frequency f of the ring-shaped muffling cavity (321) correspondingly change to adapt to different fan noise frequency f HDD .

20. The method of claim 18, wherein, Before the step S1, the noise elimination method further comprises: Step S0, determining the noise transmission path H(jw) of the fan according to the overall height, overall width of the server, and the distance between the fan wall support (21) and the back plate of the hard disk module (10); Determining the source of noise P(x, y, z, t) according to the brand, specification and rotating speed of the fan; Determining the noise at the far field position according to the formula p=P(x, y, z, t)×H(jw); Through a plurality of test data, the inference model is trained, and after the training of the inference model is completed, the inference model is embedded into the main control program for calling by the main control program.

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