Manufacturing method of noise reduction apron board, noise reduction apron board and vehicle

Abstract

The invention relates to a noise reduction apron board manufacturing method, a noise reduction apron board and a vehicle, the noise reduction apron board comprises at least one noise reduction area, each noise reduction area comprises a plurality of noise reduction units, and the method comprises the steps that the frequency range of noise is determined, and a plurality of frequency band intervals are divided based on the frequency range, wherein the noise reduction unit corresponds to the frequency band interval; confirming structure information of the noise reduction unit according to the corresponding frequency band interval, and setting a corresponding structure of the noise reduction unit according to the structure information; and the corresponding structures of the noise reduction units in each noise reduction area are coupled to obtain the noise reduction apron board. According to the apron board, targeted sound insulation and noise reduction can be conducted on noise of different frequency bands, broadband noise can be effectively reduced, and the sound insulation and noise reduction effect of the apron board is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle equipment, and specifically provides a method for manufacturing a noise reduction skirt, a noise reduction skirt and a vehicle. Background Art

[0002] At present, vehicles, especially rail vehicles, are prone to generate large noises due to wheel friction and collision, which can cause great trouble to nearby residents when passing through densely populated areas. Usually, skirts are added to reduce noise and sound insulation to reduce the impact.

[0003] The skirt board in the related art generally only reduces noise through a single plate-like structure, and the frequency band that can be used is narrow, making it difficult to perform targeted sound insulation and noise reduction for broadband noise. Summary of the invention

[0004] The present application is proposed to solve the above-mentioned problems. According to one aspect of the present application, a method for manufacturing a noise reduction skirt board is provided, wherein the noise reduction skirt board includes at least one noise reduction area, and each of the noise reduction areas includes a plurality of noise reduction units. The method includes: confirming the frequency range of the noise, and dividing the frequency range into a plurality of frequency band intervals, wherein the noise reduction units correspond to the frequency band intervals; confirming the structural information of the noise reduction unit according to the corresponding frequency band intervals, and setting the corresponding structure of the noise reduction unit according to the structural information; coupling the corresponding structures of the noise reduction units in each of the noise reduction areas to obtain the noise reduction skirt board.

[0005] Exemplarily, the noise reduction unit includes a plurality of cells, the cells are embedded tube structures, and the structural information of the noise reduction unit includes at least combination information of the cells.

[0006] Exemplarily, the combined information of the cell includes geometric parameters of the cell, and the geometric parameters include: an equivalent inner diameter of the cell, a depth of the cell, and a position parameter of the cell in the noise reduction unit.

[0007] Exemplarily, confirming the structural information of the noise reduction unit according to the corresponding frequency band includes: confirming the functional relationship between the sound absorption coefficient of the cell, the target frequency and the geometric parameters, wherein the target frequency belongs to the frequency band; setting multiple preset geometric parameters of the cell in the noise reduction unit; substituting the preset geometric parameters into the functional relationship, retaining the preset geometric parameters whose corresponding sound absorption parameters are higher than preset values; introducing new geometric parameters to perform multiple rounds of iterations, and confirming that the preset geometric parameters corresponding to the maximum value of the sound absorption parameters are the geometric parameters of the cell in the noise reduction unit.

[0008] Exemplarily, the noise reduction skirt panel includes a front panel and a back panel, the front panel includes a plurality of noise reduction areas, and each of the noise reduction areas includes a plurality of noise reduction units; after coupling the corresponding structures of the noise reduction units in each of the noise reduction areas, the method further includes: combining the front panel and the back panel to obtain the noise reduction skirt panel.

[0009] Exemplarily, the method further includes: forming a plurality of partition bars between the front plate and the back plate to form a hollow cavity between the back plate and the front plate; wherein at least one end of a portion of the cells is located in the hollow cavity.

[0010] Exemplarily, the back panel, the front panel and the partition strip are integrally formed.

[0011] Exemplarily, the confirming the frequency range of the noise and dividing it into a plurality of frequency bands based on the frequency range includes: confirming a limit value of the noise source and confirming the frequency range based on the limit value; dividing the frequency range into a preset number of frequency bands, wherein the noise reduction unit corresponds to the number of the frequency bands.

[0012] According to another aspect of the present application, a noise reduction skirt board is provided, which includes: a back panel; a front panel, wherein the front panel is arranged on the back panel, the front panel includes at least one noise reduction area, and the noise reduction area includes a plurality of noise reduction units; each of the noise reduction units corresponds to a frequency band interval, and the corresponding structure of the noise reduction unit is set based on the frequency band interval to reduce the noise within the frequency band interval.

[0013] Exemplarily, the noise reduction unit includes multiple cells, and the corresponding structure of the noise reduction unit includes at least combination information of the cells; the geometric parameters of the cells in the noise reduction unit are set based on the target frequency in the corresponding frequency band interval so that the cells are combined and arranged according to the frequency band interval; wherein the cells are embedded tube structures, and the combination information of the cells includes the geometric parameters of the cells, and the geometric parameters include: the equivalent inner diameter of the cells, the depth of the cells, and the position parameters of the cells in the noise reduction unit.

[0014] Exemplarily, the front panel includes a plurality of evenly arranged noise reduction areas, each of the noise reduction areas includes a plurality of the noise reduction units, and the noise reduction units in each of the noise reduction areas are coupled.

[0015] Exemplarily, a hollow cavity is further provided between the back plate and the front plate, and a plurality of partition bars are provided between the back plate and the front plate to form the hollow cavity between the back plate and the front plate.

[0016] According to another aspect of the present application, a noise reduction skirt is provided, and the noise reduction skirt is manufactured by the above method.

[0017] According to yet another aspect of the present application, a vehicle is provided, comprising the above-mentioned noise reduction skirt.

[0018] The noise reduction skirt board obtained by the manufacturing method in the present application will carry out targeted design of the structure of the noise reduction unit for different frequency bands, so that targeted sound insulation and noise reduction can be carried out for noises in different frequency bands, which can effectively reduce broadband noise and enhance the sound insulation and noise reduction effect of the skirt board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0020] Figure 1 A front schematic diagram of the noise reduction skirt in an embodiment of the present application is shown.

[0021] Figure 2 Shows Figure 1 Enlarged view of part A.

[0022] Figure 3 A schematic diagram of a method for manufacturing a noise reduction skirt panel in an embodiment of the present application is shown.

[0023] Figure 4 A flowchart of a method for manufacturing a noise reduction skirt panel in an embodiment of the present application is shown.

[0024] Figure 5 A comparison diagram of the effects of the noise reduction skirt board in the embodiment of the present application and the traditional skirt board is shown.

[0025] Figure numerals: 1, back panel; 2, front panel; 20, noise reduction area; 21, noise reduction unit; 22, cell. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0027] like Figure 1 As shown, an embodiment of the present application provides a noise reduction skirt plate, comprising a back plate 1 and a front plate 2 , wherein the front plate 2 is arranged on the back plate 1 , and the front plate 2 comprises a plurality of noise reduction units 21 .

[0028] Each noise reduction unit 21 corresponds to a frequency band interval, and the corresponding structure of the noise reduction unit 21 is set based on the frequency band interval to reduce the noise in the frequency band interval.

[0029] The noise reduction skirt board in the embodiment of the present application is arranged as a structure in which a front panel 2 and a back panel 1 cooperate with each other. The noise reduction unit 21 on the front panel 2 is specifically designed for different frequency bands, and targeted sound insulation and noise reduction can be performed for noises in different frequency bands, which can effectively reduce broadband noise and enhance the sound insulation and noise reduction effect of the skirt board.

[0030] like Figure 1-Figure 2 As shown, illustratively, the noise reduction unit 21 includes a plurality of cells 22, and the corresponding structure of the noise reduction unit at least includes a combination arrangement of cells, and the cells 22 in the noise reduction unit 21 are combined and arranged based on frequency band intervals.

[0031] The front plate 2 in the embodiment of the present application includes a plurality of noise reduction areas 20, and each noise reduction area 20 includes a plurality of the noise reduction units 21. The noise reduction units 21 in the same noise reduction area 20 are coupled to form a whole. For example, the noise reduction units 21 can be coupled in a uniform arrangement, such as arranged in a rectangular array. In some embodiments, the noise reduction units 21 in a noise reduction area 20 can also be coupled in other arrangements.

[0032] Exemplarily, a plurality of noise reduction units 21 in a noise reduction area 20 correspond to different frequency bands. The frequency bands are divided by the limit value of the noise source frequency, and the frequency range of the noise to be handled by the noise reduction skirt is determined according to the limit value of the noise source, and the frequency range is divided into a preset number of frequency bands. The number of frequency bands is consistent with the number of noise reduction units 21, and both are preset numbers. Figure 2 The number of noise reduction units 21 in a noise reduction area 20 shown is four. When dividing the frequency band, the number of frequency band intervals is also four. The division of the frequency range by multiple frequency band intervals can be uniform, or can be adjusted according to actual conditions.

[0033] Exemplarily, the noise reduction skirt in the embodiment of the present application also includes a partition bar (not shown in the figure), which is located between the back plate 1 and the front plate 2. The partition bar is closed all around, and a hollow cavity is formed between the front plate 2 and the back plate 1 by the front plate 2, the back plate 1 and a plurality of partition bars, wherein one end of some cells 22 is located in the hollow cavity. In the process of sound insulation and noise reduction, the hollow cavity can have a resonance effect, thereby further enhancing the overall sound insulation effect. Exemplarily, the structure of the front plate 2, the back plate 1 and the partition bar can be integrally formed. In some embodiments, the front plate 2, the back plate 1 and the partition bar can also be manufactured separately and then combined, such as being connected to each other by welding.

[0034] The cell 22 in the noise reduction unit 21 is an embedded tube structure, one end of the embedded tube is in the noise reduction unit 21, and the other end of part of the embedded tube is located in the hollow cavity. The geometric parameters of the cell 22 in the noise reduction unit 21 are set based on the target frequency in the corresponding frequency band interval, so that the cell 22 is arranged in combination according to the frequency band interval. Figure 2 As shown, multiple embedded tubes of different sizes form a noise reduction unit 21 through a set arrangement, and a noise reduction area 20 is formed through the coupling of multiple noise reduction units 21. Exemplarily, for the embedded tubes as cells 22, different structures of the embedded tubes and their arrangement determine the noise frequencies that can be reduced, and different embedded tubes have different structures, including but not limited to: different embedded tubes have different size parameters and installation positions.

[0035] Specifically, the geometric parameters include: the equivalent inner diameter of the cell 22, the depth of the cell 22, and the position parameters of the cell 22 in the noise reduction unit 21. For the embedded tube, the hole in the middle (such as Figure 2 (as shown) are not necessarily all circular holes, so the inner diameter of the hole will be regarded as an equivalent radius. Because part of the embedded tube is located in the hollow cavity, its depth is not the same. The depth of the inner wall tube can be considered as the length between its two ends, which also represents the depth of the hole in the middle of the embedded tube. The position parameters of the cell 22 in the noise reduction unit 21 can be expressed by three-dimensional coordinates, which respectively represent the positions of its center position in three directions in the coordinate system. Each cell 22 can be constrained by the above-mentioned geometric parameters, so that the layout of each cell 22 can be obtained, so as to arrange them to form the final noise reduction unit 21, and then the noise reduction unit 21 is coupled (evenly arranged), so that a noise reduction area 20 that can cope with noise in the entire frequency range can be obtained. A plurality of identical noise reduction areas 20 form a front plate 2, which is finally used to form an overall noise reduction skirt.

[0036] like Figure 2As shown, a noise reduction area 20 in the figure includes four different noise reduction units 21, each noise reduction unit 21 is provided with a plurality of cells 22, i.e., embedded tubes, and the four noise reduction units 21 (represented by ① to ④ in the figure) are evenly arranged, wherein the even arrangement is one of the coupling arrangement modes of the plurality of noise reduction units 21, and the arrangement modes of the cells 22 in different noise reduction units 21 are not the same, and the difference in the arrangement modes is the manifestation of the different geometric parameters. Exemplarily, the equivalent inner diameters of the cells 22 in these noise reduction units 21 from ① to ④ gradually increase, and the embedded tubes with larger equivalent inner diameters are more suitable for dealing with noises with lower frequencies. Exemplarily, different noise reduction units 21 have the same number of cells 22 (assuming that the number is M), but the same number of cells 22 have different arrangements, and the plurality of noise reduction units 21 deal with noises of different frequencies respectively, so that the overall structure can play an effective sound insulation effect under wide-band noise.

[0037] The noise reduction skirt in the present application, on the one hand, the noise reduction unit 21 on the front plate 2 is specifically designed for noises of different frequencies, which can effectively reduce noises of different frequencies. On the other hand, the front plate 2, the back plate 1 and the hollow cavity in the middle are manufactured in an integrated manner, which is convenient for installation, maintenance and replacement. In addition, the structure of the hollow cavity can not only reduce noise by resonance, but also contribute to the lightweight of the overall structure, which can reduce weight and reduce material consumption. The noise reduction skirt in the present application is not fixed in the range of noise. Before manufacturing, the noise frequency can be sampled according to the application scenario, so that the cell 22 can be flexibly designed to cope with a variety of usage scenarios.

[0038] When the noise reduction skirt is used, the noise reduction skirt is usually arranged on the vehicle, the back plate 1 in the noise reduction skirt is located on the outside of the vehicle, and the front plate 2 is close to the inside of the vehicle. Other non-protruding parts of the back plate 1 can be used to install auxiliary devices such as suspension components.

[0039] like Figure 3 As shown, the embodiment of the present application also provides a method for manufacturing a noise reduction skirt board, wherein the noise reduction skirt board includes a plurality of noise reduction units, and the method includes the following steps:

[0040] S310: confirming a frequency range of noise, and dividing the frequency range into a plurality of frequency bands, wherein the noise reduction units correspond to the frequency bands.

[0041] S320: Confirm the structural information of the noise reduction unit according to the corresponding frequency band interval, and set the corresponding structure of the noise reduction unit according to the structural information.

[0042] S330, coupling the corresponding structures of the noise reduction units in each noise reduction area to obtain a noise reduction skirt.

[0043] The manufacturing method in the embodiment of the present application divides the noise source by frequency to obtain different frequency bands. For the noise in different frequency bands, the structure of the noise reduction unit will be designed in a targeted manner. Therefore, targeted sound insulation and noise reduction can be performed for noise in different frequency bands, which can effectively reduce broadband noise and enhance the sound insulation and noise reduction effect of the skirt panel.

[0044] Exemplarily, the noise reduction unit includes a plurality of cells, the cells include embedded tubes, and the structural information of the noise reduction unit includes at least combination information of the cells.

[0045] like Figure 4 The figure is a flowchart of the process of preparing the noise reduction skirt board in the embodiment of the present application. The steps are as follows:

[0046] First, we need to confirm the frequency range of the noise source. We can analyze the noise source and obtain the sound pressure level of the noise. Then, we can deduce the frequency range through the function of sound pressure level and frequency. As shown in the figure, the function can be expressed by the following formula:

[0047] SPL=g(f),f lower ≤f≤f upper

[0048] Where SPL represents the sound pressure level of the noise, and f represents the frequency. Thus, the frequency range of the noise can be determined by knowing the sound pressure level. Then, the frequency range required in the present application method is determined based on the frequency range of the noise and actual needs, that is, f0-f N , where the frequency range required in this application is within the frequency limit value of the noise. Because some limit values ​​may appear under extreme circumstances, the frequency range in this application can be selected and confirmed according to actual needs.

[0049] Next, the frequency range is divided to obtain a plurality of narrower frequency bands. For example, N in the present application is a preset number of frequency band intervals, and N may be 4. The frequency band intervals and the number thereof correspond to the number of noise reduction units in a noise reduction area.

[0050] Afterwards, for the above-mentioned four frequency bands, the corresponding noise reduction units will be structurally optimized to obtain four metamaterial structures. It should be noted that the metamaterial structure here is the noise reduction unit mentioned above. Because the cellular structures in the noise reduction unit are different, it has acoustic properties that conventional materials do not have, so it is used as a metamaterial structure. Exemplarily, the base material of the metamaterial structure can be selected according to actual conditions, such as metal materials: copper, iron, aluminum and metal alloys, or polymer materials: such as resin materials. It can be selected according to actual use requirements, and the base material is not limited here. However, after confirming the type of base material, the overall material used will no longer change to facilitate manufacturing and subsequent structural design.

[0051] Finally, the four metamaterial structures that have been combined and designed are coupled to form a complete noise reduction area, and multiple identical noise reduction areas together form the structure of the front plate, and then the front plate and the back plate are combined to form a noise reduction skirt. Exemplarily, the front plate and the back plate of the noise reduction skirt can also be formed in one piece. While the front plate is formed by the method described above, the structure of the back plate is also formed to obtain the final noise reduction skirt.

[0052] Exemplarily, the superstructure material is a noise reduction unit, each noise reduction area includes 4 noise reduction units (assuming that N in the previous text is 4), each noise reduction unit includes multiple cells, and the cell is an embedded tube. The optimal design of the noise reduction unit is to design the combination information of multiple cells, where the combination information includes geometric parameters, and the geometric parameters include the equivalent inner diameter of the cell, the depth of the cell, and the position parameters of the cell in the noise reduction unit.

[0053] The following describes the specific process of obtaining geometric parameters:

[0054] First, the functional relationship between the sound absorption coefficient, target frequency and geometric parameters of the cell is confirmed, where the target frequency belongs to the frequency band.

[0055] Afterwards, a plurality of preset geometric parameters of the cells in the noise reduction unit are set, the preset geometric parameters are substituted into the functional relationship, and the preset geometric parameters whose corresponding sound absorption parameters are higher than the preset values ​​are retained.

[0056] New geometric parameters are introduced to perform multiple rounds of iterations to confirm that the preset geometric parameters corresponding to the maximum values ​​of the sound absorption parameters are the geometric parameters of the cells in the noise reduction unit.

[0057] The following first explains the relevant functional relationship of the geometric parameters. For a single cell, the relationship between its geometric parameters and acoustic impedance can be confirmed:

[0058] Z=g(f0,r,d,a,b,c)

[0059] In the above formula, f0 represents the target frequency, r represents the equivalent inner diameter of the cell, d represents the depth of the cell, a, b and c represent the position parameters of the cell in the noise reduction unit, and the position parameters here can be considered as the coordinate values ​​in x, y, and z in the three-dimensional coordinates, thereby indicating the setting position of the cell in the noise reduction unit.

[0060] The noise reduction module includes multiple cells, and the total acoustic impedance can be determined based on the acoustic impedance of a single cell, as shown in the following formula:

[0061]

[0062] Among them, M represents the number of cells, and Z represents the acoustic impedance. The total acoustic impedance of the noise reduction module can be determined by summing them up. The acoustic impedance and the absorption coefficient correspond to each other and can be expressed by the following formula:

[0063]

[0064] in, S0 is the total area of ​​M cells, ρ0 and c0 are the density and speed of sound of air respectively. Combining the above functional relationship, the relationship between the sound absorption coefficient and the geometric parameters can be confirmed:

[0065] α=h(f0,R,D,A,B,C)

[0066] It should be noted that RC here represents the geometric parameter group of all cells. If the number of M is 25 ( Figure 2 The number of cells in a single denoising unit), then there should be 25 sets of geometric parameters in the above function.

[0067] After the geometric parameters and sound absorption parameters are confirmed, the geometric parameters can be substituted and the optimization can be performed with the highest sound absorption parameter as the optimization target. The target frequency f0 is the frequency within the frequency band corresponding to the current noise reduction unit.

[0068] For this optimization process, several groups of geometric parameters (i.e., several groups of cells, each group has M cells, and each group contains the geometric parameters of all M cells in the group) can be randomly set at the beginning. In each round of optimization, several forward calculations are actually performed, and the parameter groups with higher sound absorption coefficients in this round are selected to enter the next round of calculations. In the iterative process, the number of parameter groups calculated each time is the same. In the current calculation, because some parameter groups with lower sound absorption coefficients are eliminated, new parameters will be introduced, and these newly introduced parameters are closer to the retained parameters than the deleted parameter groups.

[0069] After the above multiple rounds of calculations, the parameter group with the highest sound absorption coefficient in the last round is selected, which is the parameter group obtained in the reverse optimization process, and the geometric parameters in this parameter group correspond to the geometric parameters of each cell we need. When the geometric parameters are confirmed, the layout of each cell in the current noise reduction module is confirmed, and the layout of each cell (embedded tube) is carried out based on this, completing the design and preparation of the current noise reduction unit.

[0070] Each noise reduction unit can be designed and prepared in the above manner, and finally a complete noise reduction area is formed. It should be noted that for different noise reduction units, the target frequency f0 is different because it corresponds to different frequency bands.

[0071] Regarding the above step S330, because the front panel in the present application includes a noise reduction area, the noise reduction area includes a plurality of noise reduction units.

[0072] Therefore, this step is specifically as follows: arrange the cells according to the combination information to form a noise reduction unit; then couple the multiple noise reduction units in each noise reduction area, and form the front panel through multiple identical noise reduction areas, and combine the front panel and the back panel to obtain a noise reduction skirt panel.

[0073] Among them, the front plate and the back plate can be integrally formed, or they can be processed separately and then connected together. In addition, there are multiple partition bars between the front plate and the back plate, and the edges of the partition bars are closed. The front plate, the back plate and the partition bars form a hollow cavity. One end of the embedded tube as part of the cell will enter the hollow cavity. This is also due to the difference in the depth d of the embedded tube in the geometric parameters in the previous article. In the process of sound insulation and noise reduction, the hollow cavity can have a resonance effect, thereby further enhancing the overall sound insulation effect.

[0074] The noise reduction skirt board obtained by the manufacturing method in the present application will carry out targeted design of the combination of cells in the noise reduction unit for different frequency bands. Therefore, targeted sound insulation and noise reduction can be carried out for noises in different frequency bands, which can effectively reduce broadband noise and enhance the sound insulation and noise reduction effect of the skirt board.

[0075] like Figure 5 As shown, it is a comparison diagram of the noise reduction skirt board in the present application and the traditional skirt board facing broadband noise, the horizontal axis represents the noise frequency, and the vertical axis represents the overall sound pressure level (its size represents the sound insulation effect on noise). The dotted line and the solid line in the figure respectively represent the change in sound pressure level when the skirt board in the present application is used and the traditional skirt board is used. It can be seen from the figure that the skirt board in the present application has a better effect of sound insulation and noise reduction.

[0076] The embodiment of the present application also provides a vehicle, wherein the vehicle includes the noise reduction skirt described above. Exemplarily, the vehicle is a rail vehicle. By setting the above-mentioned noise reduction skirt on the vehicle, the combination of cells in the noise reduction unit will be designed specifically for different frequency bands, so that targeted sound insulation and noise reduction can be performed for noises in different frequency bands, which can effectively reduce broadband noise. In addition, the noise reduction skirt uses a hollow structure, which can resonate with the noise, further reducing the impact of the noise and effectively improving the sound insulation effect.

[0077] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0078] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0079] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0080] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0081] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0082] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for manufacturing a noise reduction skirt, characterized in that: The noise reduction skirt comprises at least one noise reduction area, each of the noise reduction areas comprises a plurality of noise reduction units, and the method comprises: Determine the frequency range of the noise, and divide the noise into a plurality of frequency bands based on the frequency range, wherein the noise reduction unit corresponds to the frequency bands; Confirming structural information of the noise reduction unit according to the corresponding frequency band interval, and setting a corresponding structure of the noise reduction unit according to the structural information; The corresponding structures of the noise reduction units in each of the noise reduction areas are coupled to obtain the noise reduction skirt.

2. The method according to claim 1, characterized in that The noise reduction unit includes a plurality of cells, each of which is an embedded tube structure, and the structural information of the noise reduction unit includes at least combination information of the cells.

3. The method according to claim 2, characterized in that The combined information of the cells includes geometric parameters of the cells, and the geometric parameters include: an equivalent inner diameter of the cells, a depth of the cells, and position parameters of the cells in the noise reduction unit.

4. The method according to claim 3, characterized in that The confirming the structural information of the noise reduction unit according to the corresponding frequency band interval includes: confirming a functional relationship between the sound absorption coefficient of the cell, a target frequency, and the geometric parameters, wherein the target frequency belongs to the frequency band; Setting a plurality of preset geometric parameters of the cell in the noise reduction unit; Substituting the preset geometric parameters into the functional relationship, and retaining the preset geometric parameters whose corresponding sound absorption parameters are higher than the preset values; New geometric parameters are introduced to perform multiple rounds of iterations to confirm that the preset geometric parameters corresponding to the maximum values ​​of the sound absorption parameters are the geometric parameters of the cells in the noise reduction unit.

5. The method according to claim 1, characterized in that The noise reduction skirt plate comprises a front plate and a back plate, the front plate comprises a plurality of noise reduction areas, and each of the noise reduction areas comprises a plurality of noise reduction units; After coupling the corresponding structures of the noise reduction units in each of the noise reduction areas, the method further includes: combining the front plate and the back plate to obtain the noise reduction skirt plate.

6. The method according to claim 5, characterized in that The method further includes: forming a plurality of partition bars between the front plate and the back plate to form a hollow cavity between the back plate and the front plate; wherein at least one end of a portion of the cells is located in the hollow cavity.

7. The method according to claim 6, characterized in that The back plate, the front plate and the partition strip are integrally formed.

8. The method according to any one of claims 1 to 7, characterized in that: The confirming the frequency range of the noise and dividing the frequency range into a plurality of frequency bands based on the frequency range includes: determining a limit value of a noise source, and determining the frequency range based on the limit value; The frequency range is divided into a preset number of frequency band intervals, wherein the noise reduction units correspond to the number of the frequency band intervals.

9. A noise reduction skirt, characterized in that: The noise reduction skirt comprises: Back panel; A front plate, the front plate is arranged on the back plate, the front plate includes at least one noise reduction area, and the noise reduction area includes a plurality of noise reduction units: Each of the noise reduction units corresponds to a frequency band interval, and the corresponding structure of the noise reduction unit is set based on the frequency band interval to reduce the noise in the frequency band interval.

10. The noise reduction skirt according to claim 9, characterized in that: The noise reduction unit includes a plurality of cells, and the corresponding structure of the noise reduction unit includes at least combination information of the cells; the geometric parameters of the cells in the noise reduction unit are set based on the target frequency in the corresponding frequency band interval, so that the cells are combined and arranged according to the frequency band interval; The cell is an embedded tube structure, and the combination information of the cell includes geometric parameters of the cell, and the geometric parameters include: an equivalent inner diameter of the cell, a depth of the cell, and a position parameter of the cell in the noise reduction unit.

11. The noise reduction skirt according to claim 9, characterized in that: The front plate includes a plurality of evenly arranged noise reduction areas, each of the noise reduction areas includes a plurality of the noise reduction units, and the noise reduction units in each of the noise reduction areas are coupled.

12. The noise reduction skirt according to any one of claims 9 to 11, characterized in that: A hollow cavity is further provided between the back plate and the front plate, and a plurality of partition bars are provided between the back plate and the front plate to form the hollow cavity between the back plate and the front plate.

13. A noise reduction skirt, characterized in that: The noise reduction skirt is manufactured by the method according to any one of claims 1-8.

14. A vehicle, characterized in that: The vehicle includes the noise reduction skirt of claim 13.

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