Server fan silencer design method, device, equipment and fan silencer

Abstract

The present invention discloses a method, device, equipment and fan muffler design for a server fan, including: determining a target insertion loss spectrum after the muffler is installed at a preset position according to the characteristic frequency of the server hard disk; the muffler includes a sound cavity; obtaining a correction curve, the correction curve being an insertion loss spectrum curve after a shell without a sound cavity is installed at a preset position; obtaining a target transmission loss spectrum of the muffler according to the target insertion loss spectrum and the correction curve; obtaining the size parameters of the muffler according to the target transmission loss spectrum. The size parameters of the designed muffler can accurately match the noise component of the hard disk resonance frequency, effectively solve the impact of noise resonance on hard disk performance, enable the hard disk to operate in a low-noise environment, and avoid the influence of resonance on the normal operation of the precision components in the server hard disk.

Description

Technical Field

[0001] The present invention relates to the technical field of silencer devices, and more specifically, to a server fan silencer design method, device, equipment, computer-readable non-volatile storage device, computer program product and fan silencer. Background Art

[0002] With the development of information technology, the types of servers are becoming more and more diverse, the data processed by servers are becoming more and more massive, the computing tasks are becoming more and more complex, and the heat generated by electronic devices in servers is becoming more and more significant.

[0003] In order to effectively dissipate the heat of the server, the fan-driven air flow is currently mainly used to remove the heat emitted by the electronic devices in the server. During the high-speed rotation of the fan, noise with multiple frequency components will be generated, such as aerodynamic noise, electromagnetic noise and vibration noise, etc. These noises not only affect the working environment of the server, but may also have an adverse effect on other precision devices inside the server. In particular, the mechanical hard disk of the server includes precision devices such as magnetic heads, magnetic arms, bearings and motors. These precision devices are extremely sensitive to external vibration and noise, and are easily affected by resonance to affect normal operation, thereby affecting the read and write performance of the mechanical hard disk, and even causing the hard disk to be scrapped prematurely.

[0004] In the related art, a fan muffler is provided to eliminate the noise component of the hard disk resonance frequency, so that the hard disk can operate in a low-noise environment. However, the fan muffler in the related art cannot accurately match the noise component of the hard disk resonance frequency, and thus cannot effectively solve the impact of noise resonance on hard disk performance.

[0005] Therefore, how to effectively eliminate the noise component of the hard disk resonance frequency is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In view of this, the object of the present invention is to provide a server fan muffler design method, a server fan muffler design device, a server fan muffler design equipment, a computer readable non-volatile storage device and a computer program product, which can effectively eliminate the noise component of the hard disk resonance frequency.

[0007] Another object of the present invention is to provide a fan muffler obtained by the above-mentioned server fan muffler design method, which fan muffler can effectively eliminate the noise component of the hard disk resonance frequency.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A server fan muffler design method, comprising:

[0010] Determining a target insertion loss spectrum after the silencer is installed at a preset position according to the characteristic frequency of the server hard disk; the silencer includes a sound cavity;

[0011] Obtaining a correction curve, wherein the correction curve is an insertion loss spectrum curve after the housing without the acoustic cavity is installed in the preset position;

[0012] Obtaining a target transmission loss spectrum of the muffler according to the target insertion loss spectrum and the correction curve;

[0013] The size parameters of the silencer are obtained according to the target transmission loss spectrum.

[0014] On the one hand, according to the target transmission loss spectrum, the size parameters of the muffler are obtained, including:

[0015] Obtaining the resonance frequency of the acoustic cavity according to the target transmission loss spectrum;

[0016] According to the resonant frequency, the size parameters of the muffler are obtained.

[0017] On the other hand, after obtaining the target transmission loss spectrum, the method further includes:

[0018] Obtaining the bandwidth of the acoustic cavity according to the target transmission loss spectrum;

[0019] According to the resonant frequency, the size parameters of the muffler are obtained, including:

[0020] According to the resonant frequency and the bandwidth, the size parameters of the silencer are obtained.

[0021] On the other hand, according to the resonant frequency and the bandwidth, the size parameters of the muffler are obtained, including:

[0022] Obtaining an influence factor of the acoustic cavity according to the resonant frequency and the bandwidth;

[0023] According to the resonant frequency and the influencing factor, the size parameters of the muffler are obtained.

[0024] On the other hand, before obtaining the size parameters of the muffler according to the resonant frequency and the influencing factor, the method further includes:

[0025] Determining the aperture ratio of the acoustic cavity;

[0026] According to the resonant frequency and the influencing factor, the size parameters of the muffler are obtained, including:

[0027] The size parameters of the muffler are obtained according to the resonant frequency, the influence factor and the opening ratio.

[0028] On the other hand, the silencer includes an outer shell, an inner shell arranged in the outer shell, and a sound cavity wall connected between the outer shell and the inner shell, the sound cavity wall is used to divide the space between the outer shell and the inner shell into the sound cavity, and the inner shell is provided with an opening connecting the sound cavity and the inner hole of the inner shell.

[0029] On the other hand, the porosity ranges from 0.05 to 0.9.

[0030] On the other hand, the thickness of the inner shell, the thickness of the outer shell and the thickness of the acoustic cavity wall are all in the range of 1.5 mm to 2 mm.

[0031] On the other hand, according to the resonant frequency, the influence factor and the opening ratio, the size parameters of the muffler are obtained, including:

[0032] The radial dimension of the air duct of the server fan is used as the inner diameter of the inner shell.

[0033] On the other hand, the resonant frequency includes a first resonant frequency and a second resonant frequency, the first resonant frequency is greater than the second resonant frequency, and the outer diameter of the housing corresponding to the first resonant frequency is smaller than the outer diameter of the housing corresponding to the second resonant frequency.

[0034] On the other hand, the total length of the outer shell and the inner shell is equal and is L; the sum of the length of all the acoustic cavities and the length of all the acoustic cavity walls is equal to L.

[0035] On the other hand, before obtaining the size parameters of the silencer according to the target transmission loss spectrum, the method further includes:

[0036] Determining a minimum value of an inner contour dimension of the acoustic cavity, and determining a maximum value of an outer contour dimension of the acoustic cavity;

[0037] When the size parameters of the muffler are obtained according to the target transmission loss spectrum, the size parameters of the radial cross section of the muffler are designed between the minimum value and the maximum value.

[0038] On the other hand, determining the minimum value of the inner contour dimension of the acoustic cavity includes:

[0039] The side length of the inscribed square of the air duct of the server fan is taken as the minimum value.

[0040] On the other hand, determining the maximum value of the outer contour dimension of the acoustic cavity includes:

[0041] The distance between the centers of two adjacent server fans is taken as the maximum value.

[0042] On the other hand, a correction curve is obtained, where the correction curve is an insertion loss spectrum curve after the housing without the acoustic cavity is installed in the preset position, including:

[0043] After the manufactured housing is installed at the preset position, the server fan is started to obtain an insertion loss spectrum curve of the housing to the server fan noise;

[0044] The insertion loss spectrum curve is used as the correction curve.

[0045] On the other hand, the shell is printed by 3D printing equipment, or obtained by CNC machining.

[0046] On the other hand, the shell includes a cylindrical shell without the sound cavity and a support member, the number and distribution of the cylindrical shells are the same as the number and distribution of the server fans, the cylindrical shells are integrated with the support member, and the shell is an integrated structure.

[0047] On the other hand, according to the target insertion loss spectrum and the correction curve, the target transmission loss spectrum of the muffler is obtained, including:

[0048] Sampling the correction curve to obtain sampling points with the same frequency as the target insertion loss spectrum;

[0049] The target insertion loss spectrum is subtracted from the corresponding sampling point to obtain the target transmission loss spectrum.

[0050] On the other hand, obtaining the resonant frequency of the acoustic cavity according to the target transmission loss spectrum includes:

[0051] When the distance between the peak point in the target transmission loss spectrum and the center of the bandwidth of the target transmission loss spectrum is within a preset range, the frequency of the peak point is used as the resonant frequency.

[0052] On the other hand, obtaining the resonant frequency of the acoustic cavity according to the target transmission loss spectrum includes:

[0053] When the distance between the peak point in the target transmission loss spectrum and the center of the bandwidth of the target transmission loss spectrum exceeds a preset range, the frequency of the center point of the bandwidth is used as the resonant frequency.

[0054] A fan muffler, wherein the size parameters of the fan muffler are obtained by any of the above-mentioned server fan muffler design methods.

[0055] A server fan muffler design device, comprising:

[0056] A target insertion loss spectrum determination device is used to determine a target insertion loss spectrum after the muffler is installed at a preset position according to the characteristic frequency of the server hard disk; the muffler includes a sound cavity;

[0057] A correction curve acquisition device, used for acquiring a correction curve, wherein the correction curve is an insertion loss spectrum curve after the housing without the acoustic cavity is installed in the preset position;

[0058] a target transmission loss spectrum determining device, for obtaining a target transmission loss spectrum of the muffler according to the target insertion loss spectrum and the correction curve;

[0059] The muffler size parameter design device is used to obtain the size parameters of the muffler according to the target transmission loss spectrum.

[0060] A server fan muffler design device, comprising:

[0061] Memory for storing computer programs;

[0062] A processor is used to implement the steps of any one of the above-mentioned server fan muffler design methods when executing the computer program.

[0063] A computer-readable non-volatile storage device stores a computer program, and when the computer program is executed by a processor, the steps of any one of the above-mentioned server fan muffler design methods are implemented.

[0064] A computer program product includes a computer program / instruction, wherein when the computer program / instruction is executed by a processor, the steps of any one of the above-mentioned server fan muffler design methods are implemented.

[0065] The server fan muffler design method provided by the present invention has the following beneficial effects:

[0066] According to the characteristic frequency of the server hard disk, after determining the target insertion loss spectrum after the muffler is installed at the preset position, the insertion loss spectrum curve after the shell without the sound cavity is installed at the preset position is used as a correction curve, and the target insertion loss spectrum is corrected using the correction curve, so that the target transmission loss spectrum of the muffler is obtained according to the target insertion loss spectrum and the correction curve. The corrected target transmission loss spectrum deviates from the target insertion loss spectrum, but it is conducive to more accurately determining the design target of the muffler, so that the size parameters of the designed muffler can accurately match the noise component of the hard disk resonance frequency, thereby effectively solving the impact of noise resonance on the hard disk performance, allowing the server hard disk to operate in a low-noise environment, and avoiding the influence of the precision components in the server hard disk on normal operation due to resonance, thereby reducing the impact of fan noise on the server hard disk, so that the read and write accuracy of the server hard disk is guaranteed, the performance of the server hard disk is improved, and the service life of the server hard disk is extended. The optimization of the read and write performance of the server hard disk directly increases the bandwidth of data transmission and enhances the data processing capability of the server. In addition, the life of the server hard disk is extended, and the maintenance and replacement costs caused by equipment failure are reduced, thereby reducing the operating costs of the data center.

[0067] The fan muffler provided by the present invention has size parameters obtained by any of the above-mentioned server fan muffler design methods, and has the same beneficial effects as the server fan muffler design method.

[0068] The server fan muffler design device provided by the present invention corresponds to the server fan muffler design method and has the same beneficial effects as the server fan muffler design method.

[0069] The server fan muffler design device provided by the present invention corresponds to the server fan muffler design method and has the same beneficial effects as the server fan muffler design method.

[0070] The computer-readable non-volatile storage device provided by the present invention corresponds to the server fan muffler design method and has the same beneficial effects as the server fan muffler design method.

[0071] The computer program product provided by the present invention corresponds to the server fan muffler design method and has the same beneficial effects as the server fan muffler design method. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0073] Figure 1 A flow chart of a server fan muffler design method provided by a specific embodiment of the present invention;

[0074] Figure 2 Schematic diagram of target insertion loss spectrum, correction curve and target transfer loss spectrum;

[0075] Figure 3 is a schematic structural diagram of a muffler shown in an embodiment;

[0076] Figure 4 for Figure 3 Plane development diagram after the middle shell is unfolded;

[0077] Figure 5 for Figure 3 Plane development diagram after the middle inner shell is unfolded;

[0078] Figure 6 for Figure 3 A cross-sectional view of the middle acoustic cavity wall;

[0079] Figure 7 It is a schematic diagram of the curve of the effect of the cavity opening rate on the cavity resonance frequency and bandwidth;

[0080] Figure 8 A schematic diagram of the structure of a muffler shown in another embodiment;

[0081] Fig. 9 for Figure 8 Plane development diagram after the middle shell is unfolded;

[0082] Fig.10 for Figure 8 Plane development diagram after the middle inner shell is unfolded;

[0083] Fig.11 for Figure 8 A cross-sectional view of the middle acoustic cavity wall;

[0084] Fig.12 It is a schematic diagram of the influence of the outer diameter of the muffler shell on the resonance frequency and bandwidth of the sound cavity;

[0085] Fig.13 It is a schematic diagram of the inner and outer contour size range of the acoustic cavity;

[0086] Fig.14is a schematic diagram of a first shape of the inner and outer contours of the acoustic cavity;

[0087] Fig.15 is a schematic diagram of a second shape of the inner and outer contours of the acoustic cavity;

[0088] Fig.16 is a schematic diagram of a third shape of the inner and outer contours of the vocal cavity;

[0089] Fig.17 is a schematic diagram of a fourth shape of the inner and outer contours of the vocal cavity;

[0090] Fig.18 This is a structural diagram of the installation of the muffler on the fan frame;

[0091] Fig.19 A structural frame of a server fan muffler design device provided by a specific embodiment of the present invention;

[0092] Fig. 20 This is a structural block diagram of the server fan muffler design device provided by the present invention.

[0093] Reference numerals:

[0094] 11-outer shell; 12-inner shell; 13-sound cavity wall; 111-outer contour; 121-inner contour; 21-fan frame; 22-fan air duct. DETAILED DESCRIPTION

[0095] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0096] The core of the present invention is to provide a server fan muffler design method, a server fan muffler design device, a server fan muffler design equipment, a computer-readable non-volatile storage device and a computer program product, which can effectively eliminate the noise component of the hard disk resonance frequency. Another core of the present invention is to provide a fan muffler obtained by the above-mentioned server fan muffler design method, which can effectively eliminate the noise component of the hard disk resonance frequency.

[0097] Please refer to Figure 1 , an embodiment of the present invention provides a method for designing a server fan muffler, comprising steps S1-S4:

[0098] S1: Determine a target insertion loss spectrum after the silencer is installed at a preset position according to a characteristic frequency of the server hard disk; the silencer includes a sound cavity.

[0099] That is to say, in this embodiment, the target insertion loss spectrum that the acoustic cavity needs to consume is determined based on the characteristic frequency of the server hard disk, so as to achieve the purpose of reducing the server fan noise, especially eliminating the noise components that have a resonant frequency with the server hard disk, so that the server hard disk can operate in a low-noise environment, avoiding the precision components in the server hard disk from being affected by resonance and affecting normal operation, thereby ensuring the performance of the server hard disk and improving the service life of the server hard disk.

[0100] In this embodiment, two arrays are used to express the relationship between the characteristic frequency of the server hard disk and the target insertion loss of the muffler, that is, the target insertion loss spectrum of the muffler is: f1, L1; f2, L2; f3, L3..., such as Figure 2 Shown by the dashed line.

[0101] It should be noted that Insertion Loss (IL) refers to the change in system sound pressure level or electrical signal strength before and after the installation of a device (e.g., a muffler) in the field of acoustics and electroacoustics. In the field of acoustics, insertion loss is often used to measure the noise reduction effect of a muffler or sound insulation material. The greater the insertion loss, the better the noise suppression effect of the device (e.g., a muffler) is.

[0102] Resonant frequency refers to the frequency at which an object reaches maximum amplitude when subjected to periodic external forces. In acoustics, resonant frequency can refer to the natural vibration frequency of a sound cavity or structure at a specific frequency. When the sound wave frequency approaches the resonant frequency, the system sound pressure level will increase significantly. Therefore, the resonant frequency is an important parameter to consider when designing a silencer.

[0103] S2: Obtain a correction curve, where the correction curve is an insertion loss spectrum curve after the housing without the acoustic cavity is installed in a preset position.

[0104] That is, a shell without a sound cavity is manufactured, and the shell without a sound cavity is installed at a preset position where the muffler is to be installed. Then, the fan is started, and the insertion loss of the shell to the server fan noise is tested to obtain an insertion loss spectrum curve (such as Figure 2 The insertion loss spectrum curve is used as the correction curve.

[0105] That is to say, this step can correct the influence of the silencer housing 11 on the sound source, so that the noise reduction frequency of the silencer sound cavity can be more accurately matched with the resonance frequency of the corresponding server hard disk, so that the overall silencer effect of the silencer is better.

[0106] S3: Obtain the target transmission loss spectrum of the muffler according to the target insertion loss spectrum and the correction curve.

[0107] That is to say, this embodiment obtains the target transmission loss spectrum of the muffler according to the target insertion loss spectrum and the correction curve, that is, the noise reduction frequency required by the muffler sound cavity. The target transmission loss spectrum is expressed by two arrays: f1, λ1; f2, λ2; f3, λ3..., such as Figure 2 Shown by the medium thick solid line.

[0108] S4: Obtain the size parameters of the silencer based on the target transmission loss spectrum.

[0109] This embodiment obtains the size parameters of the silencer according to the target transmission loss spectrum, that is, the size parameters of the silencer are matched with the target transmission loss spectrum. Therefore, the silencer designed by this method can effectively eliminate the resonance frequency of the server hard disk, thereby achieving a better noise reduction effect.

[0110] It can be seen from this that the server fan muffler design method provided by the embodiment of the present invention determines the target insertion loss spectrum after the muffler is installed at the preset position according to the characteristic frequency of the server hard disk, and uses the insertion loss spectrum curve after the shell without the sound cavity is installed at the preset position as the correction curve, and uses the correction curve to correct the target insertion loss spectrum, so as to obtain the target transmission loss spectrum of the muffler according to the target insertion loss spectrum and the correction curve. The corrected target transmission loss spectrum deviates from the target insertion loss spectrum, but it is conducive to more accurately determining the design target of the muffler, so that the size parameters of the designed muffler can accurately match the noise component of the hard disk resonance frequency, so as to effectively solve the impact of noise resonance on the hard disk performance, so that the server hard disk can run in a low-noise environment, and avoid the precision components in the server hard disk from affecting normal operation due to resonance, so as to reduce the impact of fan noise on the server hard disk, so that the read and write accuracy of the server hard disk is guaranteed, the performance of the server hard disk is improved, and the service life of the server hard disk is extended. The optimization of the read and write performance of the server hard disk directly improves the bandwidth of data transmission and enhances the data processing capability of the server. In addition, the life of the server hard disk is extended, and the maintenance and replacement costs caused by equipment failure are reduced, thereby reducing the operating costs of the data center.

[0111] It should be noted that the above embodiment does not limit the specific implementation method of obtaining the size parameters of the silencer according to the target transmission loss spectrum, as long as the size parameters of the silencer are associated with the target transmission loss spectrum.

[0112] In some embodiments, according to the target transmission loss spectrum, the size parameters of the muffler are obtained, and step S4 includes:

[0113] The resonant frequency of the acoustic cavity is obtained according to the target transmission loss spectrum.

[0114] According to the resonant frequency of the sound cavity, the size parameters of the silencer are obtained.

[0115] That is to say, in this embodiment, the resonant frequency of the sound cavity can be obtained according to the target transmission loss spectrum, and the resonant frequency of the sound cavity is then used as the design target of the silencer. The size parameters of the silencer are obtained according to the resonant frequency of the sound cavity so that the sound cavity of the designed silencer has the desired resonant frequency.

[0116] Furthermore, in some embodiments, after obtaining the target transmission loss spectrum, the method further includes:

[0117] Based on the target transmission loss spectrum, the bandwidth of the acoustic cavity is obtained.

[0118] At this time, according to the resonant frequency of the acoustic cavity, the size parameters of the muffler are obtained, including:

[0119] The size parameters of the silencer are obtained according to the resonance frequency and bandwidth of the acoustic cavity.

[0120] That is to say, this embodiment takes the resonant frequency of the sound cavity and the bandwidth of the sound cavity as the two target parameters for the design of the silencer, and then obtains the size parameters of the silencer based on the resonant frequency of the sound cavity and the bandwidth of the sound cavity, so that the sound cavity of the designed silencer has the required resonant frequency and the required bandwidth, making the size parameters of the designed silencer more accurate.

[0121] Further, in order to facilitate obtaining the size parameters of the muffler according to the resonant frequency of the acoustic cavity and the bandwidth of the acoustic cavity, in some embodiments, the size parameters of the muffler are obtained according to the resonant frequency of the acoustic cavity and the bandwidth of the acoustic cavity, including:

[0122] According to the resonance frequency of the acoustic cavity and the bandwidth of the acoustic cavity, the influence factor of the acoustic cavity is obtained.

[0123] The size parameters of the silencer are obtained according to the resonance frequency of the acoustic cavity and the influence factor of the acoustic cavity.

[0124] That is to say, this embodiment obtains the influence factor of the acoustic cavity according to the resonant frequency of the acoustic cavity and the bandwidth of the acoustic cavity, and then obtains the size parameters of the muffler according to the resonant frequency and the influence factor of the acoustic cavity. That is to say, this embodiment uses the resonant frequency of the acoustic cavity and the influence factor of the acoustic cavity as two target parameters for the design of the muffler, and then obtains the size parameters of the muffler according to the resonant frequency of the acoustic cavity and the influence factor of the acoustic cavity, so that the acoustic cavity of the designed muffler has the required resonant frequency and the required influence factor, making the size parameters of the designed muffler more accurate.

[0125] Furthermore, in some embodiments, before obtaining the size parameters of the muffler according to the resonant frequency of the acoustic cavity and the influence factor of the acoustic cavity, the method further includes:

[0126] Determine the openness of the acoustic cavity.

[0127] According to the resonance frequency of the acoustic cavity and the influencing factor of the acoustic cavity, the size parameters of the muffler are obtained, including:

[0128] The size parameters of the silencer are obtained according to the resonance frequency of the acoustic cavity, the influence factor of the acoustic cavity and the opening ratio of the acoustic cavity.

[0129] It is understandable that the opening ratio of the sound cavity will also affect the size parameters of the silencer. Therefore, before obtaining the size parameters of the silencer based on the resonant frequency of the sound cavity and the influencing factor of the sound cavity, the opening ratio of the sound cavity is first determined to better determine the size parameters of the silencer.

[0130] For further information, please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, the muffler includes an outer shell 11, an inner shell 12 arranged in the outer shell 11, and a sound cavity wall 13 connected between the outer shell 11 and the inner shell 12. The outer shell 11 and the inner shell 12 are both cylindrical structures. The sound cavity wall 13 is used to divide the space between the outer shell 11 and the inner shell 12 into a sound cavity. The inner shell 12 is provided with an opening connecting the sound cavity and the inner hole of the inner shell 12; at least one sound cavity is provided along the length direction of the muffler, and the sound cavity is numbered i, i is a positive integer greater than or equal to 1; the i-th sound cavity is provided with N i Openings, N i is a positive integer greater than or equal to 1; the area of ​​the jth opening of the ith acoustic cavity is S ij , j is a positive integer greater than or equal to 1; the inner diameter of the inner shell 12 corresponding to the i-th sound cavity is D 1i , the outer diameter of the shell 11 corresponding to the i-th acoustic cavity is D 2i , the length of the i-th acoustic cavity is L i , the thickness of the inner shell 12 corresponding to the i-th acoustic cavity is T pi ; The opening rate of the i-th acoustic cavity is n i , n i The expression is as follows:

[0131]

[0132] The resonant frequency F of the i-th acoustic cavity pi and the opening ratio n i , the inner diameter D of the inner shell 12 1i , the outer diameter D of the housing 11 2i , the thickness T of the inner shell 12 piThe relationship between them is:

[0133]

[0134] The influence factor K of the i-th vocal cavity i and the opening ratio n i , the inner diameter D of the inner shell 12 1i , the outer diameter D of the housing 11 2i , the thickness T of the inner shell 12 pi , the length of the vocal cavity L i The relationship between them is:

[0135]

[0136] The bandwidth of the i-th cavity and impact factor K i , resonant frequency F pi The relationship between them is:

[0137]

[0138] Where c is the speed of sound waves in air, c=343 m / s.

[0139] That is to say, the shape of the silencer in this embodiment is a concentric cylindrical ring (such as Figure 3 As shown in FIG. 1 , there is a gap between the inner shell 12 and the outer shell 11, and the sound cavity wall 13 is provided between the inner shell 12 and the outer shell 11, and the gap between the inner shell 12 and the outer shell 11 is divided into at least one sound cavity along the axial direction, and the part of the outer shell 11 corresponding to the single sound cavity is unfolded into a rectangle with a length of L. i , with a width of πD 2i ,like Figure 4 As shown, it is a plan view of the outer shell 11 after it is unfolded; the part of the inner shell 12 corresponding to a single sound cavity is unfolded into a rectangular shape with a hole, such as Figure 5 As shown in FIG. 1 , it is a plan view of the inner shell 12 after it is unfolded. The white area is the opening area. The shape of the opening can be any closed geometric shape, that is, the opening can be a circular hole, a rectangular hole or a hole of other shapes, for example, Figure 5 As shown, the opening shape is rectangular, and the length dimension of the jth opening of the i-th acoustic cavity is Lp ij , the width dimension is W ij , then the area of ​​the jth opening of the ith acoustic cavity is , at this time, the opening rate n of the i-th acoustic cavity i The expression is:

[0140]

[0141] It should be noted that the number of acoustic cavities can be one or at least two, and any two adjacent acoustic cavities are separated by an acoustic cavity wall 13 to form mutually independent acoustic cavities. In addition, the number of openings on a single acoustic cavity can be one or at least two, and when the number of openings on a single acoustic cavity is at least two, the shapes and sizes of different openings can be the same or different.

[0142] In some embodiments, all openings of a sound cavity have the same shape and size. In this case, the length of the opening of the i-th sound cavity is Lp. i , the width dimension is W i , for example, Figure 5 As shown, there are three sound cavities. The length dimension of the opening of the first sound cavity is Lp1, and the width dimension is W1. The length dimension of the opening of the second sound cavity is Lp2, and the width dimension is W2. The length dimension of the opening of the third sound cavity is Lp3, and the width dimension is W3.

[0143] In addition, if Figure 6 As shown, the cross-sectional shape of the sound cavity wall 13 is determined by the shapes and sizes of the inner shell 12 and the outer shell 11 .

[0144] In addition, when the size parameters of the muffler are obtained according to the resonance frequency of the acoustic cavity, the influence factor of the acoustic cavity and the aperture ratio of the acoustic cavity, the aperture ratio of the acoustic cavity can be determined first, and the thickness of the inner shell 12 corresponding to the i-th acoustic cavity can be determined as T pi Then, the inner diameter D of the inner shell 12 corresponding to the i-th acoustic cavity is determined according to the following three formulas: 1i , the outer diameter D of the housing 11 corresponding to the i-th acoustic cavity 2i .

[0145]

[0146]

[0147]

[0148] That is, this embodiment provides a specific calculation formula between the size parameters of the silencer and the resonant frequency, influencing factor and bandwidth of the sound cavity, and provides a quantitative design method in the application scenario of the server, which is conducive to the customized design of different silencers. In addition, it can be understood that the design of the sound cavity significantly improves the sound absorption rate at a specified frequency. The sound absorption coefficient is an indicator to measure the sound absorption ability of a material, which indicates the proportion of sound waves absorbed after being incident on the surface of the material. The value of the sound absorption coefficient ranges from 0 (no absorption at all) to 1 (complete absorption). It is usually used to describe the performance of acoustic materials such as sound-absorbing panels, sound-absorbing cotton, etc. Moreover, multiple sound cavities form multiple main peaks, which effectively increases the sound absorption bandwidth.

[0149] It should be noted that the above embodiments do not limit the porosity of the acoustic cavity. Taking into account structural strength, etc., in some embodiments, the porosity does not exceed 0.9.

[0150] For example, in some embodiments, the aperture ratio of the acoustic cavity ranges from 0.05 to 0.9. It should be noted that when other parameters of the muffler remain unchanged and only the aperture ratio is adjusted to adapt to the resonant frequency of the acoustic cavity, the resonant frequency and bandwidth of the acoustic cavity increase with the increase of the aperture ratio. Figure 7 shown.

[0151] In addition, in some embodiments, before obtaining the size parameters of the muffler according to the resonant frequency and the influence factor of the sound cavity, the method further includes:

[0152] The thickness of the inner shell 12 is determined.

[0153] It is understandable that, considering the complex structure of the inner wall of the muffler as well as the requirements of processing technology, strength, material, etc., before determining the size parameters of the muffler according to the above formula, the thickness of the inner shell 12 can be determined first.

[0154] For example, in some embodiments, the thickness of the inner shell 12, the thickness of the outer shell 11, and the thickness of the acoustic cavity wall 13 are all in the range of 1.5 mm to 2 mm, and this thickness range is particularly suitable for the case where the material of the inner shell 12, the outer shell 11, and the acoustic cavity wall 13 is plastic. Further, in some embodiments, the thickness of the inner shell 12, the thickness of the outer shell 11, and the thickness of the acoustic cavity wall 13 are all 2 mm.

[0155] by Figure 3-Figure 6 As shown, the outer shell 11 and the inner shell 12 are both cylindrical structures, and the muffler includes three sound cavities. In one embodiment, the opening ratio of the three sound cavities is n i , resonant frequency F pi ,bandwidth , the thickness T of the inner shell 12 pi , the inner diameter D of the inner shell 12 1i , the outer diameter D of the housing 11 2i and the length L of the i-th acoustic cavity i The values ​​are shown in Table 1 below:

[0156] Table 1

[0157]

[0158] Among them, the only difference between the design parameters of the first acoustic cavity and the second acoustic cavity is the opening ratio, which will form the main peaks of 4030 Hz and 7400 Hz in the target insertion loss spectrum respectively. 2iThe outer diameter D of the shell 11 of the other two sound cavities is 2i Appropriately narrow it down to form a main peak of 8550Hz in the target insertion loss spectrum.

[0159] In another embodiment, Figure 8-Figure 11 As shown, the outer shell 11 and the inner shell 12 are both in the shape of square tubes, and the muffler includes two sound cavities. In one embodiment, the opening ratio of the two sound cavities is n i , resonant frequency F pi ,bandwidth , the thickness T of the inner shell 12 pi , the inner diameter D of the inner shell 12 1i , the outer diameter D of the housing 11 2i and the length L of the i-th acoustic cavity i The values ​​are shown in Table 2 below:

[0160] Table 2

[0161]

[0162] The two acoustic cavities will form main peaks at 5330 Hz and 6150 Hz respectively in the target insertion loss spectrum, and the bandwidth of the two main peaks is relatively wide, which can form continuous higher target insertion loss spectrum peaks in the range of 4800 Hz to 6800 Hz.

[0163] In addition, when designing the size of the muffler, in order to prevent the muffler from affecting the airflow of the air duct of the server fan, in some embodiments, the size parameters of the muffler are obtained according to the resonant frequency of the acoustic cavity, the influence factor of the acoustic cavity, and the opening rate of the acoustic cavity, including:

[0164] The radial dimension of the air duct of the server fan is used as the inner diameter of the inner shell 12 .

[0165] That is to say, in this embodiment, the radial dimension of the air duct of the server fan is directly used as the inner diameter of the inner shell 12, that is, the radial dimension of the inner contour 121 of each sound cavity can be equal, and is the radial dimension of the air duct of the server fan. For example, taking a fan with a diameter of 60 mm commonly used in a server as an example, the diameter of its air duct is 44 mm. In order to ensure the ventilation area, the diameter of the inner shell 12 of the muffler to which it is adapted should not be less than 44 mm; and in order to make the sound cavity have a sufficient volume, the inner diameter D of the inner shell 12 1i The smaller the better, therefore, in order to achieve a better overall effect, the inner diameter D of the inner shell 12 1i The value is 44mm.

[0166] In addition, in order to avoid structural interference, the outer diameter D of the housing 11 2iThe value should not exceed the fan diameter plus half of the installation gap. That is, taking a 60mm diameter fan commonly used in a server as an example, the installation gap between adjacent fans is generally 4mm on one side. Therefore, the outer diameter D of the housing 11 is 2i The value should not exceed 62 mm. In addition, the outer diameter D of the housing 11 2i The value will directly affect the influence factor K of the vocal cavity. i The calculation result of the acoustic cavity is K i The larger the outer diameter D of the housing 11 is, the more intense the resonance of the muffler is, and the higher the amplitude of the target insertion loss spectrum of the acoustic cavity is. Therefore, theoretically, the outer diameter D of the housing 11 is 2i On the other hand, the resonance frequency of the silencer cavity will change with the outer diameter D of the housing 11. 2i Increase and decrease, such as Fig.12 shown.

[0167] Therefore, in some embodiments, the resonant frequency includes a first resonant frequency and a second resonant frequency, the first resonant frequency is greater than the second resonant frequency, and the outer diameter of the housing 11 corresponding to the first resonant frequency is smaller than the outer diameter of the housing 11 corresponding to the second resonant frequency. That is, if a muffler with a high-frequency resonant frequency needs to be designed, the outer diameter D of the housing 11 needs to be appropriately reduced. 2i .

[0168] In addition, in some embodiments, the total length of the outer shell 11 and the inner shell 12 is equal to L; the sum of the lengths of all the acoustic cavities and the lengths of all the acoustic cavity walls 13 is equal to L. It should be noted that the length of the acoustic cavity L i Any value can be used as needed, as long as the sum of the lengths of all acoustic cavities and the lengths of all acoustic cavity walls 13 is equal to L and meets the design goals of the resonant frequency and bandwidth of each acoustic cavity. The total length L of the inner shell 12 and the outer shell 11 can be defined according to the available space in the server chassis, as long as it is guaranteed not to interfere with other components. For example, in some embodiments, the total lengths of the outer shell 11 and the inner shell 12 are L=0.108m, respectively, and the muffler includes three acoustic cavities, the length of the first acoustic cavity is L1=0.04m, the length of the second acoustic cavity is L2=0.04m, and the length of the third acoustic cavity is L3=0.04m. At this time, the thickness of the acoustic cavity wall 13 is four, and the thickness of the four acoustic cavity walls 13 is the same, which is 0.002m respectively.

[0169] In addition, it can be understood that the size of the inner contour 121 and the outer contour 111 of the acoustic cavity determines the size of the muffler housing. In order to obtain the size parameters of the muffler, in some embodiments, before obtaining the size parameters of the muffler according to the target transmission loss spectrum, the following is also included:

[0170] Determine a minimum value of the size of the inner contour 121 of the acoustic cavity, and determine a maximum value of the size of the outer contour 111 of the acoustic cavity;

[0171] When the size parameters of the muffler are obtained according to the target transmission loss spectrum, the size parameters of the radial cross section of the muffler are designed between the minimum value and the maximum value.

[0172] That is to say, before obtaining the size parameters of the silencer according to the target transmission loss spectrum, this embodiment preferentially determines the size range of the sound cavity, so as to determine the size parameters of the silencer within the size range to ensure a suitable sound cavity and achieve a better noise reduction effect.

[0173] Further, in some embodiments, determining the minimum value of the size of the inner contour 121 of the acoustic cavity includes:

[0174] The side length of the inscribed square of the air duct of the server fan is taken as the minimum value of the inner contour 121 size of the acoustic cavity.

[0175] That is, the size of the inner contour 121 of the acoustic cavity is greater than or equal to the side length of the inscribed square of the air duct of the server fan. Fig.13 As shown, the diameter of the air duct of the server fan is D fan , then the inner contour 121 dimension D1 of the acoustic cavity is: It is understandable that when When the sound cavity is provided with a plurality of air passages, the influence of the inner contour 121 of the sound cavity (such as the inner wall of the inner shell 12) on the air supply of the air duct can be reduced as much as possible, and at the same time, the sound cavity can be ensured to have a larger volume and a better noise reduction effect.

[0176] In addition, in some embodiments, determining the maximum value of the size of the outer contour 111 of the acoustic cavity includes:

[0177] The distance between the centers of two adjacent server fans is taken as the maximum value of the outer contour 111 of the acoustic cavity.

[0178] That is, the size of the outer contour 111 of the acoustic cavity is less than or equal to the distance between the centers of two adjacent server fans. Fig.13 As shown, the distance between the centers of two adjacent server fans is D cage , then the outer contour 111 dimension D2 of the acoustic cavity is: It is understandable that when This can avoid structural interference when two adjacent silencers are installed, thereby ensuring the normal installation of the silencers.

[0179] In addition, it should be noted that the embodiment of the present invention does not limit the specific shapes of the inner contour 121 of the acoustic cavity and the outer contour 111 of the acoustic cavity. The inner contour 121 of the acoustic cavity and the outer contour 111 of the acoustic cavity can be any closed geometric shape, such as Figure 14-17 As shown. For example, the inner contour 121 of the acoustic cavity can be circular, quadrilateral or hexagonal, etc. When the inner contour 121 of the acoustic cavity is a polygon, the corners of any two adjacent sides can be arc transitions. The outer contour 111 of the acoustic cavity can be circular, quadrilateral or hexagonal, etc. When the outer contour 111 of the acoustic cavity is a polygon, the corners of any two adjacent sides can be arc transitions. The shapes of the inner contour 121 of the acoustic cavity and the outer contour 111 of the acoustic cavity can be the same or different.

[0180] like Fig.18 As shown, it is a schematic diagram of the structure of the designed silencer installed on the fan frame 21. The number of silencers is the same as the number of fans, and the distribution of silencers is the same as the distribution of fans. For ease of installation, multiple silencers can be integrated on a supporting structure for overall installation.

[0181] In addition, in order to facilitate obtaining a correction curve, in some embodiments, a correction curve is obtained, and the correction curve is an insertion loss spectrum curve after the housing without a sound cavity is installed in a preset position, including:

[0182] After the manufactured housing is installed at a preset position, the insertion loss spectrum curve of the test housing to the server fan noise is obtained by starting the server fan;

[0183] The insertion loss spectrum curve is used as the correction curve.

[0184] That is to say, in order to obtain the correction curve, a shell similar to a muffler is made, but the shell does not have a sound cavity. The shell is installed at the preset position where the muffler in this article is to be installed, and then the server fan is started. The insertion loss of the shell to the server fan noise is tested to obtain an insertion loss spectrum curve, which is used as the correction curve.

[0185] It should be noted that this embodiment does not limit the specific method of processing the shell. In some embodiments, the shell is printed by a 3D printing device, or obtained by CNC machining. It should be noted that CNC (Computer Numerical Control) is a technology that uses computer-controlled machine tools (such as milling machines, lathes, etc.) for processing. CNC machining can accurately manufacture complex parts and components, and is widely used in mechanical manufacturing, mold manufacturing and other fields. In the design of silencers, CNC can be used to make high-precision prototypes and final products. 3D printing equipment can also accurately manufacture complex parts and components, and is widely used in mechanical manufacturing, mold manufacturing and other fields.

[0186] In addition, since there are usually multiple server fans, in order to facilitate the installation of the shell, in some embodiments, the shell includes a cylindrical shell without a sound cavity and a support member. The number and distribution of the cylindrical shells are the same as the number and distribution of the server fans. The cylindrical shells are integrated with the support member, and the shell is an integrated structure. In other words, a group of cylindrical shells are integrated into one by the support member. The so-called group refers to the number of cylindrical shells to be installed in a chassis. During installation, the overall installation of the cylindrical shell is achieved by connecting the support member to the server chassis, which is convenient for installation. It should be noted that in the embodiment of the present invention, in addition to not having a sound cavity, the other structural dimensions of the shell without a sound cavity can be the same as the structural dimensions of the muffler. For example, the inner diameter of the cylindrical shell without a sound cavity can be the same as the inner diameter of the inner shell of the muffler, the outer diameter of the cylindrical shell without a sound cavity can be the same as the outer diameter of the outer shell of the muffler, and the overall structural layout of the cylindrical shell without a sound cavity can be the same as the overall structural layout of the muffler. For example, Fig.18 As shown in FIG. 1 , it is a schematic diagram of the structure of the silencer with a sound cavity installed on the fan frame 21. The schematic diagram of the structure after the shell without a sound cavity is installed on the fan frame 21 can also be as shown in FIG. Fig.18 As shown, except that in this case the shell does not have a sound cavity.

[0187] In addition, in order to facilitate obtaining the target transmission loss spectrum of the muffler, in some embodiments, the target transmission loss spectrum of the muffler is obtained according to the target insertion loss spectrum and the correction curve, including:

[0188] Sampling the correction curve to obtain sampling points with the same frequency as the target insertion loss spectrum;

[0189] The target insertion loss spectrum is subtracted from the corresponding sampling point to obtain the target transmission loss spectrum.

[0190] That is, the present embodiment obtains the target transmission loss spectrum by subtracting the target insertion loss spectrum from the correction curve. It is understandable that when the target insertion loss spectrum and the correction curve are subtracted, the horizontal coordinates of the two need to be consistent. The present embodiment samples the correction curve to obtain sampling points with the same frequency as the target insertion loss spectrum. In this process, when the horizontal coordinates of the target insertion loss spectrum and the sampling points are inconsistent, the differential method is used for resampling so as to make a difference between the target insertion loss spectrum and the vertical coordinates of the sampling points when the horizontal coordinates are the same.

[0191] like Figure 2 As shown, the correction curve is sampled and the sampling points are obtained as follows: ,but: , i=1, 2, 3….

[0192] Further, in some embodiments, obtaining the resonant frequency of the acoustic cavity according to the target transmission loss spectrum includes:

[0193] When the distance between the peak point in the target transmission loss spectrum and the center of the bandwidth of the target transmission loss spectrum is within a preset range, the frequency of the peak point is taken as the resonance frequency.

[0194] That is, after obtaining the target transmission loss spectrum, the coordinates of each peak point of the target transmission loss spectrum are extracted, for example, Figure 2 shown .

[0195] When the distance between the peak point in the target transmission loss spectrum and the center of the bandwidth of the target transmission loss spectrum is within a preset range, that is, the distance between the abscissa of the peak point and the center of the bandwidth of the target transmission loss spectrum is close, and the abscissa of the peak point is close to the center of the bandwidth of the target transmission loss spectrum, the peak point can be directly used as the resonant frequency of the acoustic cavity, for example, Figure 2 In .

[0196] In some other embodiments, obtaining the resonant frequency of the acoustic cavity according to the target transmission loss spectrum includes:

[0197] When the distance between the peak point in the target transmission loss spectrum and the center of the bandwidth of the target transmission loss spectrum exceeds a preset range, the frequency of the center point of the acoustic cavity bandwidth is used as the resonant frequency.

[0198] That is, when the abscissa of the peak point deviates far from the center point of the bandwidth of the target transmission loss spectrum, such as Figure 2 In At this time, the frequency of the center point of the acoustic cavity bandwidth can be used as the resonant frequency.

[0199] In addition to the above-mentioned server fan muffler design method, the present invention also provides a fan muffler, the size parameters of which are obtained by any of the above-mentioned server fan muffler design methods. The structure of each part of the fan muffler can be referred to in the relevant technology, which will not be described in detail in this article.

[0200] The key point of this embodiment is that the server fan muffler design method disclosed in any one of the above embodiments has the same beneficial effects as the above server fan muffler design method.

[0201] Furthermore, in some embodiments, the fan muffler includes an outer shell 11, an inner shell 12 arranged in the outer shell 11, and a sound cavity wall 13 connected between the outer shell 11 and the inner shell 12, the sound cavity wall 13 is used to divide the space between the outer shell 11 and the inner shell 12 into a sound cavity, and the inner shell 12 is provided with an opening connecting the sound cavity and the inner hole of the inner shell 12.

[0202] This embodiment does not limit the cross-sectional shape of the inner shell 12 and the outer shell 11, and the cross-sectional shapes of the inner shell 12 and the outer shell 11 can be any closed geometric shape. The shape of the sound cavity wall 13 is determined by the contour shape of the inner shell 12 and the outer shell 11. The determination or calculation of the various parameters of the fan muffler can refer to the above, and will not be repeated here.

[0203] Corresponding to the above server fan muffler design method embodiment, the embodiment of the present invention also provides a server fan muffler design device. The server fan muffler design device described below and the server fan muffler design method described above can be referenced to each other.

[0204] Please refer to Fig.19 , is a structural frame of a server fan muffler design device provided in a specific embodiment of the present invention. The server fan muffler design device comprises:

[0205] The target insertion loss spectrum determining device 31 is used to determine the target insertion loss spectrum after the muffler is installed at a preset position according to the characteristic frequency of the server hard disk; the muffler includes a sound cavity;

[0206] A correction curve acquisition device 32, used to acquire a correction curve, the correction curve being an insertion loss spectrum curve after the housing without the acoustic cavity is installed in a preset position;

[0207] The target transmission loss spectrum determining device 33 is used to obtain the target transmission loss spectrum of the muffler according to the target insertion loss spectrum and the correction curve;

[0208] The silencer size parameter design device 34 is used to obtain the size parameters of the silencer according to the target transmission loss spectrum.

[0209] During operation, the target insertion loss spectrum determining device 31 is used to determine the target insertion loss spectrum after the silencer is installed in the preset position according to the characteristic frequency of the server hard disk; the silencer includes a sound cavity; and the correction curve obtaining device 32 is used to obtain the correction curve, which is the insertion loss spectrum curve after the shell without the sound cavity is installed in the preset position; then, the target transmission loss spectrum of the silencer is obtained according to the target insertion loss spectrum and the correction curve by the target transmission loss spectrum determining device 33; and then, the size parameters of the silencer are obtained according to the target transmission loss spectrum by the silencer size parameter design device 34.

[0210] The server fan muffler design device has the same beneficial effects as the above-mentioned server fan muffler design method, which will not be repeated here.

[0211] Corresponding to the above server fan silencer design method embodiment, please refer to Fig. 20, which is a structural block diagram of the server fan muffler design device provided by the present invention, and the server fan muffler design device includes a memory 41 and a processor 42, the memory 41 is used to store computer programs; the processor 42 is used to implement the steps of the server fan muffler design method disclosed in any one of the above embodiments when executing the computer program.

[0212] For an introduction to the server fan muffler design device provided by the present invention, please refer to the above-mentioned server fan muffler design method embodiment, and the present invention will not be elaborated here.

[0213] Corresponding to the above server fan muffler design method embodiments, the present invention also provides a computer-readable non-volatile storage device, on which a computer program is stored. When the computer program is executed by a processor, the steps of the server fan muffler design method disclosed in any one of the above embodiments can be implemented.

[0214] The computer-readable non-volatile storage device may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0215] For an introduction to the computer-readable non-volatile storage device provided by the present invention, please refer to the above-mentioned server fan muffler design method embodiment, and the present invention will not be elaborated here.

[0216] Corresponding to the above server fan muffler design method embodiments, the present invention also provides a computer program product, which includes a computer program / instructions, and when the computer program / instructions are executed by a processor, the steps of the server fan muffler design method disclosed in any one of the above embodiments are implemented.

[0217] For an introduction to the computer program product provided by the present invention, please refer to the above-mentioned server fan muffler design method embodiment, and the present invention will not be elaborated here.

[0218] It should be noted that the embodiment of the present invention introduces a design method for a server fan muffler. Of course, the muffler can also be applied to other scenarios where fans are required for ventilation and heat dissipation and noise control is required, such as cars, airplanes, range hoods, air conditioners, PCs, etc. The design method of the muffler can refer to the design method of the above-mentioned server fan muffler.

[0219] It should also be noted that, in this specification, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0220] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0221] The above is a detailed introduction to the server fan muffler design method, device, equipment, computer-readable non-volatile storage device, computer program product and fan muffler provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A method for designing a server fan muffler, characterized in that: include: According to the characteristic frequency of the server hard disk, determine the target insertion loss spectrum after the muffler is installed in the preset position; The muffler includes a sound cavity; Obtaining a correction curve, wherein the correction curve is an insertion loss spectrum curve after the housing without the acoustic cavity is installed in the preset position; Obtaining a target transmission loss spectrum of the muffler according to the target insertion loss spectrum and the correction curve; The size parameters of the silencer are obtained according to the target transmission loss spectrum.

2. The server fan muffler design method according to claim 1, characterized in that: According to the target transmission loss spectrum, the size parameters of the muffler are obtained, including: Obtaining the resonance frequency of the acoustic cavity according to the target transmission loss spectrum; According to the resonant frequency, the size parameters of the muffler are obtained.

3. The server fan muffler design method according to claim 2, characterized in that: After obtaining the target transmission loss spectrum, the method further includes: Obtaining the bandwidth of the acoustic cavity according to the target transmission loss spectrum; According to the resonant frequency, the size parameters of the muffler are obtained, including: According to the resonant frequency and the bandwidth, the size parameters of the silencer are obtained.

4. The server fan muffler design method according to claim 3, characterized in that: According to the resonant frequency and the bandwidth, the size parameters of the muffler are obtained, including: Obtaining an influence factor of the acoustic cavity according to the resonant frequency and the bandwidth; According to the resonant frequency and the influencing factor, the size parameters of the muffler are obtained.

5. The server fan muffler design method according to claim 4, characterized in that: Before obtaining the size parameters of the muffler according to the resonant frequency and the influencing factor, the method further includes: Determining the aperture ratio of the acoustic cavity; According to the resonant frequency and the influencing factor, the size parameters of the muffler are obtained, including: The size parameters of the muffler are obtained according to the resonant frequency, the influence factor and the opening ratio.

6. The server fan muffler design method according to claim 5, characterized in that: The silencer includes an outer shell, an inner shell arranged in the outer shell, and a sound cavity wall connected between the outer shell and the inner shell, the sound cavity wall is used to divide the space between the outer shell and the inner shell into the sound cavity, and the inner shell is provided with an opening connecting the sound cavity and the inner hole of the inner shell.

7. The server fan muffler design method according to claim 5, characterized in that: The porosity ranges from 0.05 to 0.

9.

8. The server fan muffler design method according to claim 6, characterized in that: The thickness of the inner shell, the thickness of the outer shell and the thickness of the acoustic cavity wall are all in the range of 1.5 mm to 2 mm.

9. The server fan muffler design method according to claim 6, characterized in that: According to the resonant frequency, the influencing factor and the opening ratio, the size parameters of the muffler are obtained, including: The radial dimension of the air duct of the server fan is used as the inner diameter of the inner shell.

10. The method for designing a server fan muffler according to claim 6, characterized in that: The resonant frequency includes a first resonant frequency and a second resonant frequency, the first resonant frequency is greater than the second resonant frequency, and an outer diameter of the housing corresponding to the first resonant frequency is smaller than an outer diameter of the housing corresponding to the second resonant frequency.

11. The method for designing a server fan muffler according to claim 6, characterized in that: The total length of the outer shell and the inner shell is equal and is L; the sum of the length of all the acoustic cavities and the length of all the acoustic cavity walls is equal to L.

12. The method for designing a server fan muffler according to any one of claims 1 to 11, characterized in that: Before obtaining the size parameters of the muffler according to the target transmission loss spectrum, the method further includes: Determine the minimum value of the inner contour dimension of the acoustic cavity, and determine the maximum value of the outer contour dimension of the acoustic cavity; When the size parameters of the muffler are obtained according to the target transmission loss spectrum, the size parameters of the radial cross section of the muffler are designed between the minimum value and the maximum value.

13. The server fan muffler design method according to claim 12, characterized in that: Determining a minimum value of the inner contour dimension of the acoustic cavity comprises: The side length of the inscribed square of the air duct of the server fan is taken as the minimum value.

14. The server fan muffler design method according to claim 12, characterized in that: Determining the maximum value of the outer contour dimension of the acoustic cavity includes: The distance between the centers of two adjacent server fans is taken as the maximum value.

15. The method for designing a server fan muffler according to any one of claims 1 to 11, characterized in that: Obtaining a correction curve, the correction curve being an insertion loss spectrum curve after the housing without the acoustic cavity is installed in the preset position, including: After the manufactured housing is installed at the preset position, the server fan is started to obtain an insertion loss spectrum curve of the housing to the server fan noise; The insertion loss spectrum curve is used as the correction curve.

16. The method for designing a server fan muffler according to claim 15, characterized in that: The shell is printed by 3D printing equipment or obtained by CNC machining.

17. The method for designing a server fan muffler according to claim 15, characterized in that: The shell includes a cylindrical shell without the sound cavity and a support member. The number and distribution of the cylindrical shells are the same as the number and distribution of the server fans. The cylindrical shells are integrated with the support member, and the shell is an integrated structure.

18. The method for designing a server fan muffler according to any one of claims 1 to 11, characterized in that: According to the target insertion loss spectrum and the correction curve, a target transmission loss spectrum of the muffler is obtained, including: Sampling the correction curve to obtain sampling points with the same frequency as the target insertion loss spectrum; The target insertion loss spectrum is subtracted from the corresponding sampling point to obtain the target transmission loss spectrum.

19. The method for designing a server fan muffler according to any one of claims 2 to 11, characterized in that: Obtaining the resonance frequency of the acoustic cavity according to the target transmission loss spectrum includes: When the distance between the peak point in the target transmission loss spectrum and the center of the bandwidth of the target transmission loss spectrum is within a preset range, the frequency of the peak point is used as the resonant frequency.

20. The method for designing a server fan muffler according to any one of claims 2 to 11, characterized in that: Obtaining the resonance frequency of the acoustic cavity according to the target transmission loss spectrum includes: When the distance between the peak point in the target transmission loss spectrum and the center of the bandwidth of the target transmission loss spectrum exceeds a preset range, the frequency of the center point of the bandwidth is used as the resonant frequency.

21. A fan muffler, characterized in that: The size parameters of the fan silencer are obtained by the server fan silencer design method according to any one of claims 1-20.

22. A server fan muffler design device, characterized in that: include: A target insertion loss spectrum determining device, used to determine a target insertion loss spectrum after the muffler is installed at a preset position according to the characteristic frequency of the server hard disk; The muffler includes a sound cavity; A correction curve acquisition device, used for acquiring a correction curve, wherein the correction curve is an insertion loss spectrum curve after the housing without the acoustic cavity is installed in the preset position; a target transmission loss spectrum determining device, for obtaining a target transmission loss spectrum of the muffler according to the target insertion loss spectrum and the correction curve; The muffler size parameter design device is used to obtain the size parameters of the muffler according to the target transmission loss spectrum.

23. A server fan muffler design device, characterized in that: include: Memory for storing computer programs; A processor, configured to implement the steps of the server fan muffler design method as described in any one of claims 1 to 20 when executing the computer program.

24. A computer-readable non-volatile storage device, characterized in that: The computer-readable non-volatile storage device stores a computer program, and when the computer program is executed by a processor, the steps of the server fan muffler design method according to any one of claims 1 to 20 are implemented.

25. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the server fan muffler design method according to any one of claims 1 to 20 are implemented.

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