Adaptive Noise Reduction Air Duct Device, Server, and Resonance Noise Elimination Method of Server

Abstract

The present invention provides an adaptive noise reduction air guiding device, a server, and a resonance noise elimination method for the server. The adaptive noise reduction air guiding device includes a diversion structure group and a resonance sound absorption structure. The diversion structure group is used to form a ventilation air duct communicating with an air inlet or an air outlet; the resonance sound absorption structure is movably connected to the duct wall of the ventilation air duct; wherein, the resonance sound absorption structure includes a plate body and a driving component. The plate body is arranged at a distance from the duct wall so as to form a resonance cavity between the plate body and the duct wall; the first end of the driving component is connected to the duct wall, and the second end of the driving component is connected to the plate body. The plate body is driven by the driving component to move so as to adjust the cavity depth of the resonance cavity and change the resonance noise elimination frequency of the resonance sound absorption structure to adapt to different main noise frequencies generated by a noise source. The present invention solves the problem that the control of pneumatic noise in air-cooled systems such as existing servers is limited and cannot adapt to changing noise frequencies.

Description

Technical Field

[0001] The present invention relates to the technical field of air-cooling systems for electronic devices, and more particularly, to an adaptive noise reduction air guiding device, a server, and a resonance noise elimination method for the server. Background Art

[0002] In recent years, with the rapid development of edge computing technology, devices such as edge computing servers face the dual challenges of heat dissipation and noise control while providing powerful computing power. As the main heat dissipation method, air cooling can effectively remove heat, but the problem of noise generated by the air-cooling structure is becoming increasingly prominent. Especially in the application scenarios where humans and machines coexist, the demand for noise control is more urgent. Currently, the noise sources of air-cooling systems such as servers mainly include mechanical vibration noise, aerodynamic noise, and electromagnetic noise. Among them, mechanical vibration noise and aerodynamic noise account for the main proportion. However, the existing technology has limited control over aerodynamic noise.

[0003] In the field of noise control, active noise reduction technology realizes local noise reduction by generating sound waves with opposite phases to the noise. However, this technology is limited in application in complex environments such as servers, and is difficult to implement. It is either limited to the noise reduction effect in a specific space, or limited by the complexity of the control method and space occupation, or has a limited adaptation range for noise frequencies.

[0004] Passive noise reduction technology attenuates noise through physical means. The existing passive noise reduction mainly reduces noise by designing a specific cavity structure. The noise control range of passive noise reduction is limited and the frequency is fixed, and it cannot adapt to the change of noise frequency caused by the rotation speed change of the air-cooling structure under different working conditions of the device. When the rotation speed of the air-cooling structure changes, the noise reduction effect of the passive noise reduction structure may weaken, and even in some cases, the noise may deteriorate.

[0005] In summary, the existing server noise control methods have the following deficiencies: 1. It is difficult for active noise reduction technology to achieve noise reduction in the entire space area, and the control method is relatively complex; 2. The noise control range and frequency of passive noise reduction technology are fixed, and it cannot adapt to the change of noise frequency and intensity during the operation of the device. Especially when the rotation speed of the air-cooling structure changes, its noise reduction performance cannot be automatically adjusted, which limits its application in variable working environments. Summary of the Invention

[0006] The main object of the present invention is to provide an adaptive noise reduction air guiding device, a server, and a resonance noise elimination method for the server, so as to solve the problem that the existing air-cooling systems such as servers have limited control over aerodynamic noise and cannot adapt to changing noise frequencies.

[0007] To achieve the above object, according to one aspect of the present invention, an adaptive noise reduction air guiding device is provided, which is used to be arranged at the air inlet of the air-cooling structure of the air-cooling system or the air outlet of the air-cooling structure. The adaptive noise reduction air guiding device includes a diversion structure group and a resonance sound absorption structure. The diversion structure group is used to form a ventilation air duct communicating with the air inlet or the air outlet; the resonance sound absorption structure is movably connected to the duct wall of the ventilation air duct; wherein, the resonance sound absorption structure includes a plate body and a driving component. There is a distance set between the plate body and the duct wall so as to form a resonance cavity between the plate body and the duct wall; the first end of the driving component is connected to the duct wall, and the second end of the driving component is connected to the plate body. The plate body is driven by the driving component to move so as to adjust the cavity depth of the resonance cavity and change the resonance noise reduction frequency of the resonance sound absorption structure to adapt to different main noise frequencies generated by the noise source.

[0008] In an exemplary embodiment, resonance sound absorption structures are arranged on at least two relatively arranged duct walls of the ventilation air duct.

[0009] In an exemplary embodiment, the ventilation air duct includes a first duct section and a second duct section that are connected and communicated. The first duct section is parallel to the air outlet direction of the air outlet or the air inlet direction of the air inlet. The second duct section has an included angle A with the first duct section. The resonance sound absorption structure is movably connected to the duct wall of the second duct section, and the plate body is parallel to the duct wall of the second duct section.

[0010] In an exemplary embodiment, in the air outlet direction of the air outlet or the air inlet direction of the air inlet, the value range of the included angle A between the extension line of the first duct section and the second duct section is 0 < A < 90°.

[0011] In an exemplary embodiment, the first duct section and the second duct section are smoothly transitioned.

[0012] In an exemplary embodiment, the driving component includes a first elastic member and a second elastic member. Wherein, both ends of the first elastic member are respectively connected to the plate body and the duct wall, and heating electrodes are arranged at both ends of the first elastic member. The heating electrodes are used to be connected to the control module of the server with an air-cooling system through a cable. The temperature of the first elastic member is changed through the heating electrodes to adjust the elastic force of the first elastic member; both ends of the second elastic member are respectively connected to the plate body and the duct wall, and the second elastic member is used to provide a reset elastic force for the plate body.

[0013] In an exemplary embodiment, there are at least two first elastic members, and at least two first elastic members are all located on the first diagonal line of the plate body; there are at least two second elastic members, and at least two second elastic members are all located on the second diagonal line of the plate body.

[0014] In an exemplary embodiment, the first elastic member is an SMA spring, and the second elastic member is a return spring.

[0015] In an exemplary embodiment, the driving assembly further includes a temperature sensor disposed on the first elastic member for detecting the real-time temperature of the first elastic member and converting the real-time temperature into a temperature signal for transmission to the control module of the server.

[0016] In an exemplary embodiment, a plurality of guiding holes are formed in the plate body, and the plurality of guiding holes are arranged at intervals along the circumferential direction of the plate body; a plurality of guiding columns protrude from the air duct wall, and the plurality of guiding columns correspond to the plurality of guiding holes one by one, and each guiding column passes through the corresponding guiding hole.

[0017] In an exemplary embodiment, there are multiple groups of diversion structure groups, and at least one air-cooled heat dissipation structure corresponds to one group of diversion structure groups, so that one ventilation air duct corresponds to at least one air outlet, or so that one ventilation air duct corresponds to at least one air inlet.

[0018] In an exemplary embodiment, adjacent two groups of the multiple groups of diversion structure groups are arranged with a distance therebetween, so as to form a sound insulation cavity between the adjacent two groups of diversion structure groups.

[0019] According to another aspect of the present invention, there is provided a server, including an air-cooling system, an adaptive noise reduction air guiding device, a noise sensor and a control module. Among them, the air-cooling system includes an air-cooled heat dissipation structure, and the air-cooled heat dissipation structure has an air inlet and an air outlet; the adaptive noise reduction air guiding device is disposed at the air inlet or the air outlet, and the adaptive noise reduction air guiding device is the above-mentioned adaptive noise reduction air guiding device; the noise sensor performs real-time frequency domain analysis on the noise generated by the noise source in the server to obtain the main frequency of the noise; the control module is signal-connected to the noise sensor to obtain the noise signal converted from the main frequency of the noise; wherein, the control module is control-connected to the driving assembly of the resonance absorption structure of the adaptive noise reduction air guiding device to control the driving assembly to drive the plate body to move according to the noise signal.

[0020] In an exemplary embodiment, the control module is connected to the heating electrodes at both ends of the first elastic member of the driving assembly to control the heating of the first elastic member through the two heating electrodes; wherein, the control module is signal-connected to the temperature sensor of the driving assembly to obtain the temperature signal converted from the real-time temperature of the first elastic member detected by the temperature sensor; the control module controls the heating power of the two heating electrodes on the first elastic member according to the temperature signal, and heats or cools the temperature of the first elastic member to a target temperature. Until the temperature of the first elastic member is heated or cooled to the target temperature, the control module controls the two heating electrodes to maintain the heating power to heat or cool the first elastic member.

[0021] According to another aspect of the present invention, a resonance noise elimination method for a server is provided, which is used for the above-mentioned server. The resonance noise elimination method includes detecting in real time the main noise frequency f of the noise source in the server m ; according to the change of the main noise frequency f m , the control module controls the movement of the plate body of the resonance sound absorption structure to adjust the cavity depth N of the resonance cavity to a preset size.

[0022] In an exemplary embodiment, when the main noise frequency f m increases, the control module controls the driving component of the resonance sound absorption structure of the adaptive noise reduction air guiding device to drive the plate body to move a first preset distance toward the air duct wall on the same side according to the obtained noise signal converted from the main noise frequency f m so as to reduce the cavity depth N of the resonance cavity formed between the two; wherein, when the cavity depth N is reduced to the first preset size, the control module controls the driving component to drive the plate body to stay at the first preset distance, otherwise, the control module controls the driving component to drive the plate body to continue to move toward the air duct wall on the same side until the cavity depth N is reduced to the first preset size.

[0023] In an exemplary embodiment, when the main noise frequency f m increases, the control module controls the heating electrode to increase the heating power of the first elastic member of the driving component according to the obtained noise signal converted from the main noise frequency f m so as to increase the contraction force of the first elastic member; wherein, when the contraction force of the first elastic member is greater than the stretching force of the second elastic member, the plate body moves a first preset distance toward the air duct wall on the same side to reduce the cavity depth N of the resonance cavity formed between the two; when the cavity depth N is reduced to the first preset size, the control module controls the heating electrode to maintain the current heating power so that the first elastic member maintains the current target temperature T ref , otherwise, the control module controls the heating electrode to continue to increase the heating power of the first elastic member until the cavity depth N is reduced to the first preset size.

[0024] In an exemplary embodiment, when the main noise frequency f m decreases, the control module controls the driving component of the resonance sound absorption structure of the adaptive noise reduction air guiding device to drive the plate body to move a second preset distance away from the air duct wall on the same side according to the obtained noise signal converted from the main noise frequency f m so as to increase the cavity depth N of the resonance cavity formed between the two; wherein, when the cavity depth N is increased to the second preset size, the control module controls the driving component to drive the plate body to stay at the second preset distance, otherwise, the control module controls the driving component to drive the plate body to continue to move away from the air duct wall on the same side until the cavity depth N is increased to the second preset size.

[0025] In an exemplary embodiment, when the main noise frequency f m decreases, the control module controls the heating electrode to reduce the heating power of the first elastic member of the driving assembly according to the obtained noise signal converted from the main noise frequency f m so as to reduce the contraction force of the first elastic member; wherein, when the stretching force of the second elastic member is greater than the contraction force of the first elastic member, the plate body moves a second preset distance away from the air duct wall on the same side, so as to increase the cavity depth N of the resonance cavity formed therebetween; when the cavity depth N increases to a second preset size, the control module controls the heating electrode to maintain the current heating power so that the first elastic member maintains the current target temperature T ref , otherwise, the control module controls the heating electrode to continue to reduce the heating power of the first elastic member until the cavity depth N increases to the second preset size.

[0026] In an exemplary embodiment, the method for obtaining the target temperature T ref includes determining the distance L that the plate body needs to move to adjust the cavity depth N of the resonance cavity to a preset size, and calculating the cavity depth N based on the physical relationship between the cavity depth N and the resonance noise reduction frequency f r ; calculating the shear modulus G of the first elastic member based on the mathematical relationship between the contraction force F s of the first elastic member and the first axial stretching length λ s , and the mathematical relationship between the stretching force F n of the second elastic member and the second axial stretching length λ n by using the principle of static equilibrium; and determining the target temperature T ref of the first elastic member according to the corresponding relationship between the shear modulus G of the first elastic member and the required heating temperature.

[0027] Applying the technical solution of the present invention, an adaptive noise reduction air guiding device is provided, which is used to be arranged at the air inlet of the air cooling structure of the air cooling system or the air outlet of the air cooling structure. The adaptive noise reduction air guiding device includes a diversion structure group and a resonance sound absorption structure. Among them, the diversion structure group includes two diversion structures, and a ventilation air duct is formed between the two diversion structures. The ventilation air duct is used to communicate with the air inlet or the air outlet; the resonance sound absorption structure is movably connected to the air duct wall of the ventilation air duct; the resonance sound absorption structure includes a plate body and a driving assembly. The plate body is arranged at a distance from the air duct wall so as to form a resonance cavity between the plate body and the air duct wall; the first end of the driving assembly is connected to the air duct wall, and the second end of the driving assembly is connected to the plate body. The plate body is driven to move by the driving assembly so as to adjust the cavity depth of the resonance cavity and change the resonance noise reduction frequency of the resonance sound absorption structure to adapt to different main noise frequencies generated by the noise source.

[0028] By setting a distance between the plate body of the resonance sound absorption structure and the air duct wall of the ventilation air duct, a resonance cavity with an adjustable cavity depth is formed between the plate body and the air duct wall. In addition, the plate body is driven to move by a driving component, so as to adjust the cavity depth of the resonance cavity. Due to the adjustment of the cavity depth, the resonance sound absorption frequency of the resonance sound absorption structure is changed, which is beneficial to adapting to different main noise frequencies generated by the noise source, thereby achieving the purpose of directly adaptively reducing the noise of different main noise frequencies of the pneumatic noise, and thus realizing the noise reduction of the entire space sound field.

[0029] It should be noted that the adaptive noise reduction air guiding device provided in this application directly reduces the noise of the noise source, thereby improving the sound field environment of the entire space area. It can effectively reduce the noise of noise sources with different frequencies, and improve the flexibility and efficiency of noise control. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 Shows a partial structural schematic diagram of a server according to an optional embodiment of the present invention;

[0032] Figure 2 Shows Figure 1 The relative position schematic diagram of the adaptive noise reduction air guiding device and the air cooling heat dissipation structure of the server in;

[0033] Figure 3 Shows Figure 2 The structural schematic diagram of the adaptive noise reduction air guiding device in;

[0034] Figure 4 Shows Figure 3 The partial structural schematic diagram of the adaptive noise reduction air guiding device in;

[0035] Figure 5 Shows Figure 4 The state schematic diagram of the wind direction and noise direction of the adaptive noise reduction air guiding device in;

[0036] Figure 6 Shows Figure 3 The structural schematic diagram of the resonance sound absorption structure of the adaptive noise reduction air guiding device in;

[0037] Figure 7 Shows a flow schematic diagram of a resonance noise reduction method for a server according to an optional embodiment of the present invention;

[0038] Figure 8Schematic diagram of control logic for heating power of a first elastic member according to an alternative embodiment of the present invention is shown;

[0039] Figure 9 A method for determining the target temperature of a first elastic member according to an alternative embodiment of the present invention is shown.

[0040] Wherein, the above-mentioned drawings include the following reference numerals:

[0041] 1, air-cooled heat dissipation structure; 2, adaptive noise reduction air guiding device; 3, chassis base;

[0042] 10, air guiding cover body; 11, ventilation air duct; 111, first air duct section; 112, second air duct section; 1121, guiding column;

[0043] 20, resonance sound absorption structure; 21, plate body; 211, guiding hole; 22, driving assembly; 221, first elastic member; 222, heating electrode; 223, second elastic member;

[0044] 30, diversion structure group; 31, diversion structure;

[0045] 100, resonance cavity; 200, sound insulation cavity. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0047] To solve the problem that the air-cooled systems such as servers in the prior art have limited control over aerodynamic noise and cannot adapt to changing noise frequencies, the present invention provides an adaptive noise reduction air guiding device, a server, and a resonance noise elimination method for a server.

[0048] As Figures 1 to 6As shown in the figure, the adaptive noise reduction air guiding device is used to be arranged at the air inlet of the air-cooled heat dissipation structure 1 of the air-cooling system or at the air outlet of the air-cooled heat dissipation structure 1. The adaptive noise reduction air guiding device includes a diversion structure group 30 and a resonance sound absorption structure 20. Among them, the diversion structure group 30 is used to form a ventilation air duct 11 communicating with the air inlet or the air outlet; the resonance sound absorption structure 20 is movably connected to the duct wall of the ventilation air duct 11; among them, the resonance sound absorption structure 20 includes a plate body 21 and a driving component 22. The plate body 21 is arranged at a distance from the duct wall so as to form a resonance cavity 100 between the plate body 21 and the duct wall; the first end of the driving component 22 is connected to the duct wall, and the second end of the driving component 22 is connected to the plate body 21. The plate body 21 is driven by the driving component 22 to move so as to adjust the cavity depth of the resonance cavity 100 and change the resonance noise reduction frequency of the resonance sound absorption structure 20 to adapt to different main noise frequencies generated by the noise source.

[0049] By setting a distance between the plate body 21 of the resonance sound absorption structure 20 and the duct wall of the ventilation air duct 11, a resonance cavity 100 with adjustable cavity depth is formed between the plate body 21 and the duct wall. In addition, by driving the plate body 21 to move through the driving component 22, the purpose of adjusting the cavity depth of the resonance cavity 100 is achieved. Due to the adjustment of the cavity depth, the resonance noise reduction frequency of the resonance sound absorption structure 20 is changed, which is beneficial to adapting to different main noise frequencies generated by the noise source. Thus, the purpose of directly performing adaptive noise reduction on different main noise frequencies of the pneumatic noise is achieved, and the noise reduction of the entire space sound field is realized.

[0050] It should be noted that the adaptive noise reduction air guiding device provided in this application directly reduces the noise of the noise source, thereby improving the sound field environment of the entire space area. It can effectively reduce the noise of noise sources with different frequencies, and improve the flexibility and efficiency of noise control.

[0051] It should be noted that in this application, resonance sound absorption structures 20 are arranged on at least two relatively arranged duct walls of the ventilation air duct 11. In this way, it is ensured that the resonance sound absorption structures 20 on the two relatively arranged duct walls of the ventilation air duct 11 can effectively reduce the noise.

[0052] It should be noted that in this application, taking the example of arranging the adaptive noise reduction air guiding device at the air outlet of the air-cooled heat dissipation structure 1 of the air-cooling system, the specific description is as follows:

[0053] Such as Figures 2 to 5As shown, the ventilation air duct 11 includes a first air duct section 111 and a second air duct section 112 that are connected and communicate with each other. The first air duct section 111 is parallel to the air outlet direction of the air outlet or the air inlet direction of the air inlet. The second air duct section 112 has an included angle A with the first air duct section 111. The resonance sound absorption structure 20 is movably connected to the duct wall of the second air duct section 112, and the plate body 21 is parallel to the duct wall of the second air duct section 112. In this way, by setting the ventilation air duct 11 in a structural form including a connected first air duct section 111 and a second air duct section 112, the first air duct section 111 serves to introduce as much of the air blown out from the air outlet of the air-cooled heat dissipation structure 1 into the corresponding ventilation air duct 11 as possible. In addition, by having the second air duct section 112 have an included angle A with the first air duct section 111, the sound waves of the noise can be refracted and transmitted multiple times on the plate body 21, further enhancing the noise absorption effect, so that the noise is effectively attenuated during the process of multiple reflections and transmissions, achieving the purpose of efficient noise reduction.

[0054] Further, in the air outlet direction of the air outlet or the air inlet direction of the air inlet, the value range of the included angle A between the extension line of the first air duct section 111 and the second air duct section 112 is 0 < A < 90°. In this way, by reasonably optimizing the value range of the included angle A between the extension line of the first air duct section 111 and the second air duct section 112, the sound waves of the noise can be refracted and transmitted as many times as possible on the plate body 21, which is beneficial to enhancing the noise absorption effect.

[0055] Preferably, the value of the included angle A between the extension line of the first air duct section 111 and the second air duct section 112 is 45°. In this way, it further serves to refract and transmit the noise multiple times, thereby strengthening the noise reduction effect.

[0056] As Figure 5 shown, the arrow B in the figure represents the air outlet direction of the air outlet, the arrow C represents the sound wave transmission direction of the noise, and the arrow D represents the transmission direction of the sound wave after refraction.

[0057] It should be noted that in this application, the first air duct section 111 and the second air duct section 112 are smoothly transitioned. In this way, it ensures the smoothness of the air guiding of the ventilation air duct 11, is beneficial to reducing the disturbance of the air flow, and avoids the generation of unnecessary noise.

[0058] As Figure 6As shown in the figure, the driving component 22 includes a first elastic member 221 and a second elastic member 223. The two ends of the first elastic member 221 are respectively connected to the plate body 21 and the duct wall, and heating electrodes 222 are provided at both ends of the first elastic member 221. The heating electrodes 222 are connected to the control module of the server with an air cooling system through cables. By changing the temperature of the first elastic member 221 through the heating electrodes 222, the elastic force of the first elastic member 221 is adjusted; the two ends of the second elastic member 223 are respectively connected to the plate body 21 and the duct wall, and the second elastic member 223 is used to provide a reset elastic force for the plate body 21. In this way, by setting the driving component 22 in a structural form including the first elastic member 221 and the second elastic member 223, it is ensured that the cooperation of the first elastic member 221 and the second elastic member 223 enables the plate body 21 to move a preset distance, so that the plate body 21 reaches the preset position, and further realizes the purpose of effectively reducing the noise of the noise source.

[0059] As Figure 6 shown in the figure, there are at least two first elastic members 221, and at least two first elastic members 221 are all located on the first diagonal of the plate body 21; there are at least two second elastic members 223, and at least two second elastic members 223 are all located on the second diagonal of the plate body 21. In this way, the layout of at least two first elastic members 221 and at least two second elastic members 223 can ensure the smooth movement of the plate body 21, thereby ensuring the uniformity of the cavity depth of the resonance cavity 100, and further ensuring the noise reduction reliability of the noise source.

[0060] It should be noted that in this application, the above-mentioned first elastic member 221 is a SMA spring, and the above-mentioned second elastic member 223 is a reset spring. Among them, the SMA spring is a shape memory alloy spring. The characteristic of the SMA spring is that it shrinks when heated by electricity and expands when the temperature drops. Precise heating is carried out through PWM control, so as to change the position of the plate body 21, and further adjust the cavity depth of the resonance cavity 100 to achieve the purpose of changing the resonance noise reduction frequency.

[0061] It should be noted that in this application, the driving component 22 further includes a temperature sensor. The temperature sensor is arranged on the first elastic member 221 to detect the real-time temperature of the first elastic member 221 and convert the real-time temperature into a temperature signal to be transmitted to the control module of the server. In this way, the setting of the temperature sensor ensures that the control module can obtain the real-time temperature of the first elastic member 221 in real time.

[0062] As Figures 4 to 6As shown in the figure, a plurality of guiding holes 211 are formed in the plate body 21, and the plurality of guiding holes 211 are arranged at intervals around the circumference of the plate body 21; a plurality of guiding columns 1121 protrude from the air duct wall, and the plurality of guiding columns 1121 correspond to the plurality of guiding holes 211 one by one, and each guiding column 1121 passes through the corresponding guiding hole 211. In this way, through the cooperation of the plurality of guiding holes 211 and the corresponding plurality of guiding columns 1121, while ensuring the smooth movement of the plate body 21, it can also ensure that the plate body 21 moves away from or approaches the air duct wall in a manner parallel to the air duct wall, that is, the movement of the plate body 21 is a translation.

[0063] It should be noted that in the present application, the flow guiding structure group 30 includes two flow guiding structures 31, and a ventilation air duct 11 is formed between the two flow guiding structures 31.

[0064] It should be noted that in the present application, considering that there are multiple air-cooled heat dissipation structures 1, in order to ensure that the air blown out from the air outlet of the air-cooled heat dissipation structure 1 can be introduced into the area to be cooled as much as possible, such as Figures 2 to 4 As shown in the figure, there are multiple groups of flow guiding structure groups 30, and at least one group of flow guiding structure groups 30 corresponds to one air-cooled heat dissipation structure 1, so that one ventilation air duct 11 corresponds to at least one air outlet, or so that one ventilation air duct 11 corresponds to at least one air inlet. In this way, the air blown out from the air outlets of the air-cooled heat dissipation structures 1 can be introduced into the area to be cooled through the corresponding single ventilation air duct 11 as much as possible, thereby ensuring the heat dissipation reliability of the air-cooled heat dissipation structure 1.

[0065] Such as Figures 3 to 5 As shown in the figure, the adjacent two groups of flow guiding structure groups 30 among the multiple groups of flow guiding structure groups 30 are arranged with a distance therebetween, so that a sound insulation cavity 200 is formed between the adjacent two groups of flow guiding structure groups 30. In this way, by forming the sound insulation cavity 200 between the adjacent two groups of flow guiding structure groups 30, the function of sound insulation is achieved, and new noise is avoided due to noise crosstalk.

[0066] Such as Figures 1 to 3 As shown in the figure, the adaptive noise reduction air guiding device further includes a wind guiding cover body 10, and the flow guiding structure group 30 is arranged on the wind guiding cover body 10.

[0067] It should be noted that in the embodiments not shown in the application, the server includes an air cooling system, an adaptive noise reduction air guiding device 2, a noise sensor, and a control module. Among them, the air cooling system includes an air cooling structure 1, and the air cooling structure 1 has an air inlet and an air outlet; the adaptive noise reduction air guiding device 2 is arranged at the air inlet or the air outlet, and the adaptive noise reduction air guiding device 2 is the above-mentioned and the following-mentioned adaptive noise reduction air guiding device; the noise sensor performs real-time frequency domain analysis on the noise generated by the noise source in the server to obtain the main frequency of the noise; the control module is signal-connected to the noise sensor to obtain the noise signal converted from the main frequency of the noise; among them, the control module is control-connected to the driving component 22 of the resonance absorption structure 20 of the adaptive noise reduction air guiding device 2 to control the driving component 22 to drive the plate body 21 to move according to the noise signal.

[0068] Furthermore, the control module is connected to the heating electrodes 222 at both ends of the first elastic member 221 of the driving component 22 to control the heating of the first elastic member 221 through the two heating electrodes 222; among them, the control module is signal-connected to the temperature sensor of the driving component 22 to obtain the temperature signal converted from the real-time temperature of the first elastic member 221 detected by the temperature sensor; the control module controls the heating power of the two heating electrodes 222 on the first elastic member 221 according to the temperature signal, and heats or cools the temperature of the first elastic member 221 to the target temperature. Until the temperature of the first elastic member 221 is heated or cooled to the target temperature, the control module controls the two heating electrodes 222 to maintain the heating power to heat or cool the first elastic member 221. In this way, by connecting the control module to the heating electrodes 222 at both ends of the first elastic member 221, the purpose of controlling the heating of the first elastic member 221 is achieved. When it is necessary to reduce the cavity depth of the resonance cavity 100 by contracting the first elastic member 221, the control module controls the heating power of the heating electrodes 222 on the first elastic member 221 according to the temperature signal, thereby increasing the temperature of the first elastic member 221 until it reaches the target temperature; when the target temperature is reached, the control module maintains the heating power, thereby keeping the first elastic member 221 working at the target temperature. As a result, the first elastic member 221 generates sufficient contraction force to drive the plate body 21 to move to the required position; when it is necessary to increase the cavity depth of the resonance cavity 100 by stretching the first elastic member 221, the control module reduces the heating power of the heating electrodes 222 on the first elastic member 221, resulting in a decrease in the temperature of the first elastic member 221, thereby restoring its original length and moving the plate body 21 away from the air duct wall to the required position.

[0069] It can be seen that the first elastic member 221 provided in the present application can control the first elastic member 221 to respectively perform its contraction and extension actions in two cases of increasing the heating power and decreasing the heating power, thereby dynamically adjusting the cavity depth of the resonance cavity 100 to achieve the purpose of adaptive noise reduction.

[0070] Optionally, the control module is a single-chip microcomputer (MCU) or a baseboard management controller (BMC).

[0071] As Figure 7 shown, the resonance noise elimination method of the server is used for the above-mentioned and the following servers. The resonance noise elimination method includes real-time detection of the main noise frequency f of the noise source in the server m ; according to the change of the main noise frequency f m , the control module controls the movement of the plate body 21 of the resonance absorption structure 20 to adjust the cavity depth N of the resonance cavity 100 to a preset size.

[0072] It should be noted that in the present application, the main noise frequency f of the noise source in the server is detected in real time through the noise sensor of the server m .

[0073] As Figure 7 shown, when the main noise frequency f m increases, the control module controls the driving component 22 of the resonance absorption structure 20 of the adaptive noise reduction air guiding device 2 to drive the plate body 21 to move a first preset distance toward the side of the air duct wall on the same side according to the noise signal converted from the obtained main noise frequency f m to reduce the cavity depth N of the resonance cavity 100 formed between the two; wherein, when the cavity depth N is reduced to the first preset size, the control module controls the driving component 22 to drive the plate body 21 to stay at the first preset distance, otherwise, the control module controls the driving component 22 to drive the plate body 21 to continue to move toward the side of the air duct wall on the same side until the cavity depth N is reduced to the first preset size.

[0074] Specifically, when the main noise frequency f m increases, the control module controls the heating electrode 222 to increase the heating power of the first elastic member 221 of the driving component 22 according to the noise signal converted from the obtained main noise frequency f m to increase the contraction force of the first elastic member 221; wherein, when the contraction force of the first elastic member 221 is greater than the stretching force of the second elastic member 223, the plate body 21 moves a first preset distance toward the side of the air duct wall on the same side to reduce the cavity depth N of the resonance cavity 100 formed between the two; when the cavity depth N is reduced to the first preset size, the control module controls the heating electrode 222 to maintain the current heating power so that the first elastic member 221 maintains the current target temperature T ref, otherwise, the control module controls the heating electrode 222 to continue to increase the heating power of the first elastic member 221 until the cavity depth N is reduced to the first preset size.

[0075] As Figure 7 shown, when the main noise frequency f m decreases, the control module controls the driving component 22 of the resonance sound absorption structure 20 of the adaptive noise reduction air guiding device 2 to drive the plate body 21 to move a second preset distance away from the side of the air duct wall on the same side according to the obtained noise signal converted from the main noise frequency f m , so as to increase the cavity depth N of the resonance cavity 100 formed therebetween; wherein, when the cavity depth N increases to the second preset size, the control module controls the driving component 22 to drive the plate body 21 to remain at the second preset distance, otherwise, the control module controls the driving component 22 to drive the plate body 21 to continue to move away from the side of the air duct wall on the same side until the cavity depth N increases to the second preset size.

[0076] Specifically, when the main noise frequency f m decreases, the control module controls the heating electrode 222 to reduce the heating power of the first elastic member 221 of the driving component 22 according to the obtained noise signal converted from the main noise frequency f m , so as to reduce the contraction force of the first elastic member 221; wherein, when the stretching force of the second elastic member 223 is greater than the contraction force of the first elastic member 221, the plate body 21 moves a second preset distance away from the side of the air duct wall on the same side, so as to increase the cavity depth N of the resonance cavity 100 formed therebetween; when the cavity depth N increases to the second preset size, the control module controls the heating electrode 222 to maintain the current heating power, so that the first elastic member 221 maintains the current target temperature T ref , otherwise, the control module controls the heating electrode 222 to continue to reduce the heating power of the first elastic member 221 until the cavity depth N increases to the second preset size.

[0077] Furthermore, the method for obtaining the target temperature T ref includes determining the distance L that the plate body 21 needs to move to adjust the cavity depth N of the resonance cavity 100 to the preset size, and calculating the cavity depth N based on the physical relationship between the cavity depth N and the resonance sound absorption frequency f r ; calculating the cavity depth N based on the physical relationship between the cavity depth N and the resonance sound absorption frequency f s ; based on the mathematical relationship between the contraction force F s of the first elastic member 221 and the first axial stretching length λ n , and the stretching force F nThe mathematical relationship is used to calculate the shear modulus G of the first elastic member 221 by using the principle of static equilibrium. According to the corresponding relationship between the shear modulus G of the first elastic member 221 and the required heating temperature, the target temperature T of the first elastic member 221 is determined ref .

[0078] It should be noted that in this application, the distance L that the plate body 21 needs to move is the difference between the initial cavity depth N 0 and the cavity depth N, that is, L = .

[0079] The following specifically introduces the calculation process of the method for obtaining the target temperature T ref (refer to Figure 9 ):

[0080] Based on the formula The calculation formula for the cavity depth N is obtained: N , where f r is the resonance absorption frequency of the resonance absorption structure 20, is the air density at the corresponding real-time temperature, unit: kg / m 3 , c is the speed of sound in air, unit: m / s, is the surface density of the plate body 21, unit: kg / m 2 , K is the stiffness factor of the plate body 21, unit: kg / m 2 ×s 2 ;

[0081] Furthermore, the relationship between the contraction force F s of the first elastic member 221 and the first axial tensile length λ s of the first elastic member 221 is: , where G is the shear modulus of the first elastic member 221, d is the wire diameter of the spring of the first elastic member 221, D is the spring diameter of the first elastic member 221, and n is the number of turns of the spring of the first elastic member 221;

[0082] Furthermore, the relationship between the tension force F n of the second elastic member 223 and the second axial tensile length λ n of the second elastic member 223 is: ;

[0083] Based on the first axial tensile length λ s being equal to the second axial tensile length λ n , and based on the initial cavity depth N 0 and the difference between the cavity depth N being the distance that the plate body 21 needs to move , and based on the first axial tensile length λ s being equal to the distance that the plate body 21 needs to move and based on the contraction force F of the first elastic member 221 when the board body 21 is in a stationary state s and the expansion force F of the second elastic member 223 n being two acting forces equal in magnitude and opposite in direction, the calculation formula is obtained: , where is the stiffness coefficient of the second elastic member 223, and thus the calculation formula for the shear modulus G of the first elastic member 221 is obtained: ;

[0084] According to the calculation formula the shear modulus G of the first elastic member 221 is calculated, and according to the material properties or test data of the first elastic member 221, the corresponding relationship between the shear modulus G and the required heating temperature is obtained from a table, and the target temperature T ref is obtained.

[0085] It should be noted that in this application, the calculation formula for the stiffness factor K of the above-mentioned board body 21 is , where E is the elastic modulus of the board body 21, unit: N / m 2 , is the Poisson's ratio, and a, b, and h are the first side length, the second side length, and the thickness of the board body 21 respectively.

[0086] It should be noted that in this application, the above letter N is the cavity depth of the board body 21, unit: m.

[0087] It should be noted that in this application, the shear modulus G of the first elastic member 221 is a measure of the material's resistance to shear deformation. In this application, it reflects the ability of the SMA spring to change its shape and size under specific conditions. The shear modulus G of the SMA spring has a direct relationship with temperature. At different temperatures, the crystal structure of the SMA material is different, resulting in changes in its physical properties such as elasticity and stiffness. Therefore, according to the material properties of the SMA spring, the corresponding relationship table between its shear modulus G and temperature needs to be found, and this table is established in advance through experimental data, material property descriptions, or theoretical calculations, and it provides the shear modulus G values of the SMA spring at different temperatures; after obtaining the shear modulus G value of the SMA spring, the temperature corresponding to this shear modulus G value is found through looking up the table, that is, the target temperature T ref , the target temperature T ref is the heating power required for the SMA spring to achieve the required shear modulus G, so as to realize the change of the specific cavity depth N corresponding to the current noise main frequency f m , and the control module will adjust the heating power of the SMA spring according to the target temperature T ref to ensure that its temperature reaches and maintains at the target temperature T ref, so as to control the contraction behavior of the SMA spring, and further drive the movement of the plate body 21, change the cavity depth N of the resonance cavity 100, and finally realize the adaptive control of noise.

[0088] Applying the technical solution of the present invention, an adaptive noise reduction air guiding device is provided, which is used to be arranged at the air inlet of the air cooling structure 1 of the air cooling system or the air outlet of the air cooling structure 1. The adaptive noise reduction air guiding device includes a diversion structure group 30 and a resonance sound absorption structure 20. Among them, the diversion structure group 30 includes two diversion structures 31, and a ventilation air duct 11 is formed between the two diversion structures 31. The ventilation air duct 11 is used to communicate with the air inlet or the air outlet; the resonance sound absorption structure 20 is movably connected to the duct wall of the ventilation air duct 11; the resonance sound absorption structure 20 includes a plate body 21 and a driving component 22. The plate body 21 is arranged at a distance from the duct wall, so as to form a resonance cavity 100 between the plate body 21 and the duct wall; the first end of the driving component 22 is connected to the duct wall, and the second end of the driving component 22 is connected to the plate body 21. The plate body 21 is driven to move by the driving component 22 to adjust the cavity depth of the resonance cavity 100 and change the resonance noise reduction frequency of the resonance sound absorption structure 20 to adapt to different main noise frequencies generated by the noise source.

[0089] By setting the plate body 21 of the resonance sound absorption structure 20 at a distance from the duct wall of the ventilation air duct 11, a resonance cavity 100 with adjustable cavity depth is formed between the plate body 21 and the duct wall. In addition, by driving the plate body 21 to move through the driving component 22, the purpose of adjusting the cavity depth of the resonance cavity 100 is achieved. Due to the adjustment of the cavity depth, the resonance noise reduction frequency of the resonance sound absorption structure 20 is changed, which is beneficial to adapting to different main noise frequencies generated by the noise source. Thus, the purpose of directly performing adaptive noise reduction on different main noise frequencies of the pneumatic noise is achieved, and the noise reduction of the entire space sound field is realized.

[0090] It should be noted that in this application, the SMA spring is heated by PWM control. PWM control is a method of controlling the average value of the output signal by adjusting the pulse width. In PWM control, the frequency of the pulse is usually fixed, while the width (or duty cycle) of the pulse is variable. By adjusting the width of the pulse, the average value of the output signal can be controlled, so as to realize the control of the device. When it is necessary to increase the heating power of the SMA spring, the duty cycle of the PWM signal can be increased, so as to increase the heating power output; when it is necessary to reduce the heating power of the SMA spring, the duty cycle of the PWM signal can be reduced, so as to reduce the heating power output. In this way, precise temperature control of the SMA spring can be realized, and the SMA spring involved in this application needs to have the functions of automatic current limiting and overheat protection to ensure the service life and safe operation of the components.

[0091] Further, the temperature control of the SMA spring is a PWM closed-loop control, and the closed-loop control method is PID control or PI control. The control flow chart is as Figure 8 shown, Figure 8 In it, the target temperature T ref is input. The comparator compares the real-time temperature of the first elastic member 221 obtained by the temperature sensor with the input target temperature T ref . When there is a temperature difference between the two, the temperature PID regulator adjusts the heating power of the heating electrode 222, so as to adjust the real-time temperature of the first elastic member 221. And the shear modulus of the first elastic member 221 changes with the change of temperature, so that the expansion amount of the first elastic member changes. When the first elastic member 221 is heated to the target temperature T ref , it is maintained at this temperature and heated continuously.

[0092] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, 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.

[0093] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0094] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used herein.

[0095] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0096] It should be noted that the terms "first", "second", etc. in the description, claims, and drawings of the present 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 under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0097] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adaptive noise reduction and wind guiding device, characterized in that: The adaptive noise reduction air guide device is used to be arranged at the air inlet of the air cooling and heat dissipation structure (1) of the air cooling system or the air outlet of the air cooling and heat dissipation structure (1), and comprises: A flow guiding structure group (30), the flow guiding structure group (30) comprising two oppositely arranged air duct walls for forming a ventilation air duct (11) connected to the air inlet or the air outlet; the flow guiding structure group (30) is a plurality of groups, one group of the flow guiding structure group (30) corresponds to at least one of the air-cooling heat dissipation structures (1); two adjacent groups of the flow guiding structure groups (30) in the plurality of groups of the flow guiding structure groups (30) are arranged at a distance from each other, so that a sound insulation cavity (200) is formed between the two adjacent groups of the flow guiding structure groups (30); A resonant sound absorbing structure (20), the resonant sound absorbing structure (20) being movably connected to a duct wall of the ventilation duct (11); Wherein, the resonant sound absorbing structure (20) comprises: A plate body (21), wherein a distance is set between the plate body (21) and the air duct wall so that a resonance cavity (100) is formed between the plate body (21) and the air duct wall; A driving component (22), wherein a first end of the driving component (22) is connected to the air duct wall, and a second end of the driving component (22) is connected to the plate body (21), and the driving component (22) drives the plate body (21) to move in a manner parallel to the air duct wall, so as to adjust the cavity depth of the resonant cavity (100) and change the resonant sound absorption frequency of the resonant sound absorption structure (20) to adapt to different main frequencies of noise generated by a noise source.

2. The adaptive noise reduction and wind guiding device according to claim 1, characterized in that: The resonant sound absorption structure (20) is provided on two oppositely disposed air duct walls of the ventilation air duct (11).

3. The adaptive noise reduction and wind guiding device according to claim 1, characterized in that: The ventilation duct (11) comprises a first duct section (111) and a second duct section (112) which are connected to each other; the first duct section (111) is parallel to an air outlet direction of the air outlet or an air inlet direction of the air inlet; the second duct section (112) and the first duct section (111) have an angle A formed therebetween; the resonant sound absorbing structure (20) is movably connected to an air duct wall of the second duct section (112); and the plate body (21) is parallel to the air duct wall of the second duct section (112).

4. The adaptive noise reduction and wind guiding device according to claim 3, characterized in that: In the air outlet direction of the air outlet or the air inlet direction of the air inlet, the angle A between the extension line of the first air duct section (111) and the second air duct section (112) has a value range of 0<A<90°.

5. The adaptive noise reduction and wind guiding device according to claim 3, characterized in that: The first air duct section (111) and the second air duct section (112) transition smoothly.

6. The adaptive noise reduction and wind guiding device according to claim 1, characterized in that: The driving assembly (22) comprises: a first elastic member (221), wherein two ends of the first elastic member (221) are respectively connected to the plate body (21) and the air duct wall, and heating electrodes (222) are provided at both ends of the first elastic member (221), the heating electrodes (222) being used to connect to a control module of a server having the air cooling system via a cable, and the temperature of the first elastic member (221) is changed via the heating electrodes (222) to adjust the elastic force of the first elastic member (221); A second elastic member (223), two ends of the second elastic member (223) are respectively connected to the plate body (21) and the air duct wall, and the second elastic member (223) is used to provide a restoring elastic force for the plate body (21).

7. The adaptive noise reduction and wind guiding device according to claim 6, characterized in that: There are at least two first elastic members (221), and at least two of the first elastic members (221) are located on a first diagonal line of the plate body (21); There are at least two second elastic members (223), and at least two of the second elastic members (223) are located on the second diagonal line of the plate body (21).

8. The adaptive noise reduction and wind guiding device according to claim 6, characterized in that: The first elastic member (221) is an SMA spring, and the second elastic member (223) is a return spring.

9. The adaptive noise reduction and wind guiding device according to claim 6, characterized in that: The driving assembly (22) further comprises: A temperature sensor, the temperature sensor being arranged on the first elastic member (221) for detecting the real-time temperature of the first elastic member (221) and converting the real-time temperature into a temperature signal for transmission to the control module of the server.

10. The adaptive noise reduction and wind guiding device according to claim 1, characterized in that: The plate body (21) is provided with a plurality of guide holes (211), and the plurality of guide holes (211) are arranged at intervals around the circumference of the plate body (21); A plurality of guide posts (1121) are protrudingly arranged on the air duct wall, the plurality of guide posts (1121) correspond one-to-one to the plurality of guide holes (211), and each of the guide posts (1121) is arranged to pass through a corresponding guide hole (211).

11. The adaptive noise reduction and wind guiding device according to any one of claims 1 to 10, characterized in that: One ventilation duct (11) corresponds to at least one air outlet; or one ventilation duct (11) corresponds to at least one air inlet.

12. A server, characterized in that: include: An air cooling system, the air cooling system comprising an air cooling heat dissipation structure (1), the air cooling heat dissipation structure (1) having an air inlet and an air outlet; An adaptive noise reduction air guiding device (2), the adaptive noise reduction air guiding device (2) being arranged at the air inlet or the air outlet, the adaptive noise reduction air guiding device (2) being the adaptive noise reduction air guiding device according to any one of claims 1 to 11; A noise sensor, wherein the noise sensor performs real-time frequency domain analysis on the noise generated by the noise source in the server to obtain the main noise frequency of the noise; A control module, the control module is connected to the noise sensor signal to obtain a noise signal converted from the main frequency of the noise; The control module is connected to a drive component (22) of the resonant sound absorbing structure (20) of the adaptive noise reduction and air guiding device (2) in a control manner, so as to control the drive component (22) to drive the plate body (21) to move according to the noise signal.

13. The server according to claim 12, characterized in that: The control module is connected to the heating electrodes (222) at both ends of the first elastic member (221) of the driving assembly (22), so as to control the heating of the first elastic member (221) through the two heating electrodes (222); Wherein, the control module is connected to the temperature sensor signal of the driving component (22) to obtain a temperature signal converted from the real-time temperature of the first elastic member (221) detected by the temperature sensor; The control module controls the heating power of the two heating electrodes (222) to the first elastic member (221) according to the temperature signal, and heats or cools the temperature of the first elastic member (221) to a target temperature. When the temperature of the first elastic member (221) is heated or cooled to the target temperature, the control module controls the two heating electrodes (222) to maintain the heating power to heat or cool the first elastic member (221).

14. A resonance silencing method for a server, characterized in that: For a server according to any one of claims 12 and 13, the resonance silencing method comprises: Real-time detection of the main noise frequency of the noise source in the server f m ; According to the main frequency of the noise f m The control module controls the plate body of the resonant sound absorbing structure to move so as to adjust the cavity depth N of the resonant cavity to a preset size.

15. The resonance silencing method according to claim 14, characterized in that: When the main frequency of the noise f m When the noise increases, the control module obtains the main frequency of the noise f m The converted noise signal controls the driving component of the resonance sound absorption structure of the adaptive noise reduction wind guide device to drive the plate body to move a first preset distance toward the side of the wind duct wall on the same side, so as to reduce the cavity depth N of the resonance cavity formed therebetween; Among them, when the cavity depth N is reduced to a first preset size, the control module controls the driving assembly to drive the plate body to remain at the first preset distance; otherwise, the control module controls the driving assembly to drive the plate body to continue moving toward the side of the air duct wall on the same side until the cavity depth N is reduced to the first preset size.

16. The resonance silencing method according to claim 15, characterized in that: When the main frequency of the noise f m When the noise increases, the control module obtains the main frequency of the noise f m The converted noise signal controls the heating electrode to increase the heating power of the first elastic member of the driving assembly to increase the contraction force of the first elastic member; When the contraction force of the first elastic member is greater than the relaxation force of the second elastic member, the plate body moves toward the side of the air duct wall on the same side by the first preset distance to reduce the cavity depth N of the resonance cavity formed therebetween; When the cavity depth N is reduced to the first preset size, the control module controls the heating electrode to maintain the current heating power so that the first elastic member maintains the current target temperature T ref Otherwise, the control module controls the heating electrode to continue to increase the heating power of the first elastic member until the cavity depth N is reduced to the first preset size.

17. The resonance silencing method according to claim 14, characterized in that: When the main frequency of the noise f m When the noise decreases, the control module obtains the main frequency of the noise f m The converted noise signal controls the driving component of the resonance sound absorption structure of the adaptive noise reduction wind guide device to drive the plate body to move a second preset distance away from the side of the wind duct wall on the same side, so as to increase the cavity depth N of the resonance cavity formed between the two; Among them, when the cavity depth N increases to a second preset size, the control module controls the driving assembly to drive the plate body to remain at the second preset distance; otherwise, the control module controls the driving assembly to drive the plate body to continue moving away from the side of the air duct wall on the same side until the cavity depth N increases to the second preset size.

18. The resonance silencing method according to claim 17, characterized in that: When the main frequency of the noise f m When the noise decreases, the control module obtains the main frequency of the noise f m The converted noise signal controls the heating electrode to reduce the heating power of the first elastic member of the driving assembly to reduce the contraction force of the first elastic member; When the relaxation force of the second elastic member is greater than the contraction force of the first elastic member, the plate body moves away from the side of the air duct wall on the same side by the second preset distance to increase the cavity depth N of the resonance cavity formed between the two. When the cavity depth N increases to the second preset size, the control module controls the heating electrode to maintain the current heating power so that the first elastic member maintains the current target temperature T ref Otherwise, the control module controls the heating electrode to continue to reduce the heating power to the first elastic member until the cavity depth N increases to the second preset size.

19. The resonance silencing method according to claim 16 or 18, characterized in that: The target temperature T ref The methods for obtaining include: Determine the distance L that the plate body needs to move to adjust the cavity depth N of the resonant cavity to a preset size, and based on the cavity depth N and the resonant sound-absorbing frequency f r The physical relationship of , calculates the cavity depth N; Based on the contraction force F of the first elastic member s With the first axial stretch length λ s The mathematical relationship of the second elastic member and the relaxation tension F n and the second axial tensile length λ n The shear modulus G of the first elastic member is calculated using the mathematical relationship of static equilibrium principle; According to the corresponding relationship between the shear modulus G of the first elastic member and the required heating temperature, the target temperature T of the first elastic member is determined. ref .

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