A method and a module for testing the sound insulation of a vehicle

Abstract

The application relates to an NVH sound insulation test method and a sound insulation test module, which comprises the following steps: splicing sound insulation modules with different sizes, so that multiple sound insulation modules with different sizes are spliced into a test module with a measured part fixing cavity; fixing a measured part in the measured part fixing cavity through the test module, and testing the NVH performance of the measured part. By splicing sound insulation modules with different sizes into a test module with a measured part fixing cavity, the size of the spliced measured part fixing cavity can be conveniently adjusted. When the NVH sound insulation performance of a certain part of a vehicle body needs to be tested, the number of sound insulation modules spliced into the test module can be adjusted according to the size and shape of the measured part, thereby solving the technical problems that, in the related art, a single clamp is used to detect each part of the vehicle body, a long preparation period is required, the trial production cost of the clamp is high, and the clamp is heavy.

Description

Technical Field

[0001] This application relates to the field of sound insulation testing technology, specifically to an NVH sound insulation testing method and a sound insulation testing module. Background Technology

[0002] With the development of automotive technology, consumers have increasingly higher demands for the sensory quality of automobiles. In-vehicle NVH (Noise, Vibration, and Harshness) is a comprehensive issue that measures the quality of automobile manufacturing, and it provides the most direct and superficial experience for car users. Vehicle NVH is one of the key concerns for major international automotive manufacturers and parts suppliers. Statistics show that approximately one-third of vehicle malfunctions are related to NVH issues, and major automakers spend nearly 20% of their R&D budget on solving NVH problems. Therefore, NVH performance testing at the factory is particularly important. Given the large size of the vehicle body and its direct coverage of the passenger compartment, NVH performance testing of the vehicle body is of paramount importance.

[0003] In related technologies, to avoid mutual interference between different parts of the vehicle body, the NVH performance of the vehicle body is often tested by disassembling each part into sections and conducting tests separately. During the testing process, each part requires a separate fixture, and concrete is poured inside the fixture to increase the surface density of the fixture to complete the test. The above testing method not only requires a long preparation period, but also has high fixture manufacturing costs, and the fixture as a whole is quite bulky. Summary of the Invention

[0004] This application provides an NVH sound insulation test method and a sound insulation test module, which can solve the technical problems in related technologies that require a long preparation period, high trial production cost of the fixture, and bulky overall fixture when using separate fixtures to test various parts of the vehicle body.

[0005] In a first aspect, embodiments of this application provide an NVH sound insulation testing method, which includes the following steps: splicing sound insulation modules of different sizes to form a test module with a fixing cavity for the test component; fixing the test component in the fixing cavity for the test component through the test module, and performing NVH performance testing on the test component.

[0006] In conjunction with the first aspect, in one embodiment, the step of splicing together sound insulation modules of different sizes to form a test module with a cavity for fixing the test component includes: splicing sound insulation modules of different sizes into a complete sound insulation wall, and removing some sound insulation modules from the sound insulation wall according to the shape of the test component to form a test module with a cavity for fixing the test component.

[0007] In conjunction with the first aspect, in one embodiment, fixing the test piece to the test piece cavity via the test module includes: fixing the periphery of the test piece to the test module, such that at least a portion of the test piece is located within the test piece cavity.

[0008] In conjunction with the first aspect, in one embodiment, fixing the test piece (UTP) within the test piece fixing cavity using the test module includes: placing the UTP within the test piece fixing cavity of the test module and fixing the perimeter of the UTP to the test module; fixing a sound insulation module of appropriate size to the inner wall of the test piece fixing cavity, such that the sound insulation module covers the entire UTP along a direction perpendicular to the surface of the UTP.

[0009] In conjunction with the first aspect, in one embodiment, after fixing a sound insulation module of a corresponding size to the inner wall of the cavity for fixing the test piece, the method includes: filling the gap between the sound insulation module and the test piece with sound insulation material.

[0010] Secondly, this application provides an NVH sound insulation test module, characterized in that it includes: multiple sets of sound insulation modules, the multiple sets of sound insulation modules having different sizes; the multiple sets of sound insulation modules of different sizes are assembled to form a fixed cavity for the test piece.

[0011] In conjunction with the second aspect, in one embodiment, each set of sound insulation modules includes at least two sound insulation blocks of the same size, the at least two sound insulation blocks are fixed to each other, and each sound insulation block is filled with sound insulation material.

[0012] In conjunction with the second aspect, in one embodiment, the sound insulation blocks in all groups of sound insulation modules have the same thickness; the two sound insulation blocks in each group of sound insulation modules are arranged to overlap and interleave each other, and the distance between the sidewalls of the two sound insulation blocks on the same side is the same as the thickness of the sound insulation block.

[0013] In conjunction with the second aspect, in one embodiment, each of the sound insulation blocks is provided with two side seals, each side seal is provided around adjacent sides of the sound insulation block, the two side seals are installed on different sides of the sound insulation block, and the two side seals have a height difference along the thickness direction of the sound insulation block.

[0014] In conjunction with the second aspect, in one embodiment, each of the two sound insulation blocks in each set of sound insulation modules has a face seal on one side facing each other. The face seal of each sound insulation block is spaced apart from the other sound insulation block, and the face seal of one sound insulation block is located on the side close to the sound insulation block it mates with, while the face seal of the other sound insulation block is located on the side away from the sound insulation block it mates with.

[0015] The beneficial effects of the technical solutions provided in this application include:

[0016] By using sound insulation modules of different sizes to splice together a test module with a cavity for fixing the part under test, the size of the assembled cavity can be easily adjusted. When it is necessary to test the NVH sound insulation performance of a certain part of the vehicle body, the number of sound insulation modules spliced ​​together into a test module can be adjusted in time according to the size and shape of the part under test to form a cavity for fixing the part under test that matches the size and shape of the part under test. This solves the technical problems of using separate fixtures to test various parts of the vehicle body in related technologies, which requires a long preparation period, has high fixture trial production costs, and the fixtures are also relatively bulky. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic flowchart of the NVH sound insulation test method provided in the embodiments of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the test piece fixed in the test module according to an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of two sound insulation modules spliced ​​together according to an embodiment of this application;

[0021] Figure 4 A structural schematic diagram showing the arrangement of side seals and face seals in the sound insulation module provided in this embodiment of the application;

[0022] Figure 5 A schematic diagram of the structure of the test piece fixed to the test module from another perspective, as provided in an embodiment of this application;

[0023] Figure 6 This application provides a schematic diagram of the structure of multiple sound insulation modules spliced ​​together in different ways in its embodiments.

[0024] Figure 7 This is a side view of the sound insulation module provided in an embodiment of this application.

[0025] In the picture:

[0026] 1. Sound insulation module; 11. Sound insulation block; 111. Side sealing strip; 112. Face sealing strip; 113. Bolt mounting holes;

[0027] 2. Test module;

[0028] 3. The cavity for fixing the test piece;

[0029] 4. Test piece;

[0030] 6. Fixed railing. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0032] This application provides an NVH sound insulation test method that can solve the technical problems in related technologies, such as the need for a long preparation period, high trial production cost of the fixture, and bulky overall fixture, when using separate fixtures to test various parts of the vehicle body.

[0033] See Figure 1 The image shows an NVH (Noise, Vibration, and Harshness) insulation testing method provided in an embodiment of this application, which may include the following steps:

[0034] S1: The sound insulation modules 1 of different sizes are spliced ​​together to form a test module 2 with a test component fixing cavity 3. It should be understood that by adjusting the number and arrangement of the sound insulation modules 1, the size of the test component fixing cavity 3 can be changed to accommodate test components 4 of different sizes.

[0035] S2: The test piece 4 is fixed in the test piece fixing cavity 3 through the test module 2, and the NVH performance test is performed on the test piece 4. In this embodiment, the test piece 4 is fixed to the test module 2 by bolt fixing, which makes it easy to remove the test piece 4 from the test module 2 and to replace different test pieces 4 in the future. Before the test piece 4 is fixed to the test module 2, a certain arrangement can be installed in the test piece 4 to pre-open bolt mounting holes 113. In some other embodiments, the test piece 4 can also be fixed to the test module 2 by other methods such as adhesive.

[0036] This embodiment of the application utilizes sound insulation modules 1 of different sizes to splice together a test module 2 with a test component fixing cavity 3. This allows for convenient adjustment of the size of the assembled test component fixing cavity 3. When it is necessary to test the NVH sound insulation performance of a certain component of the vehicle body, the number of sound insulation modules 1 spliced ​​together to form the test component fixing cavity 3 that matches the size and shape of the test component 4 can be adjusted in a timely manner. Furthermore, the sound insulation modules 1 can be reused multiple times, further saving the cost of NVH performance testing. The sound insulation module 1 has multiple The different sizes of the sound insulation modules 1 allow the test component fixing cavity 3, which is spliced ​​from different sizes of sound insulation modules 1, to fit the size of the test component 4 as closely as possible, so that the test component 4 can be fixed in the test module 2. Moreover, the method of splicing the sound insulation modules 1 can be operated by a single person. The individual weight of the sound insulation module 1 is usually relatively light. Each sound insulation module 1 can be spliced ​​separately without the need for lifting equipment. This solves the technical problems in related technologies where using separate fixtures to test various parts of the vehicle body requires a long preparation period, the trial production cost of the fixtures is also high, and the fixtures as a whole are also relatively bulky.

[0037] In some optional embodiments, the step of splicing together sound insulation modules 1 of different sizes to form a test module 2 with a test component fixing cavity 3 includes: splicing sound insulation modules 1 of different sizes into a complete soundproof wall, and removing part of the sound insulation modules 1 from the soundproof wall according to the shape of the test component 4 to form a test module 2 with a test component fixing cavity 3. It should be understood that the soundproof wall mentioned above can be a soundproof window fixed on one of the walls in the anechoic chamber. When the test component 4 does not need to be monitored, the soundproof wall is in a sealed state in the anechoic chamber, and the anechoic chamber can be used normally in other tests. In this embodiment, the soundproof wall can be installed on one of the walls in the anechoic chamber by opening a pre-set window on the wall and installing a fixed railing 6 on the outer perimeter of the window. The soundproof module 1 is then spliced ​​from the fixed railing 6 towards the center point of the fixed railing 6 until the size of the test piece fixing cavity 3 spliced ​​by the soundproof module 1 is close to the size of the test piece 4. When the size of the fixed railing 6 is different, different numbers of soundproof modules 1 can be used to splice them to achieve universality between multiple fixed railings 6 of different sizes.

[0038] In some optional embodiments, fixing the test piece 4 into the test piece fixing cavity 3 via the test module 2 may include: fixing the periphery of the test piece 4 to the test module 2, so that at least a portion of the test piece is located within the test piece fixing cavity 3. See [link to relevant documentation]. Figure 2As shown in the embodiments of this application, in order to make the NVH performance test structure more accurate, in addition to fixing the periphery of the test piece 4 to the test module 2 with bolts, it is also necessary to ensure that at least a portion of the test piece 4 is located in the test piece fixing cavity 3. Each side of the test piece 4 usually has a certain width, which is used to fix a portion of each side of the test piece 4 to the test module 2, while the other portion is in the test piece fixing cavity 3. In some other embodiments, the test piece 4 can also be directly fixed to a position of the test module 2 where there is no test piece fixing cavity 3, that is, the orthographic projection of the test piece 4 is entirely located on the test module 2.

[0039] In some optional embodiments, fixing the test piece 4 to the test piece fixing cavity 3 via the test module 2 may include: placing the test piece 4 in the test piece fixing cavity 3 of the test module 2 and fixing the periphery of the test piece 4 to the test module 2. That is, in this embodiment, fixing the outer periphery of the test piece 4 to the test module 2 can ensure the stability of the fixation of the test piece 4 and minimize gaps between the outer periphery of the test piece 4 and the test module 2; fixing a sound insulation module 1 of a corresponding size to the inner wall of the test piece fixing cavity 3, so that the sound insulation module 1 covers the entire test piece 4 along the direction perpendicular to the plate surface of the test piece 4. It should be understood that the test piece 4 may be irregular in shape, see [reference]. Figure 5 As shown, the test part 4 is a car door frame. The car door frame not only has an irregular shape on its outer periphery, but its thickness direction may also have different thicknesses. The thickness direction is also... Figure 5 In the X direction shown, the thickness of the outer perimeter of the door frame is typically thinner than its thickness near the center of the door. That is, along the Y or Z direction, the thickness of the door frame may vary at different locations. To make it easier to insert the door frame into the test cavity 3, when partially removing the sound insulation module 1 from the sound insulation wall, the size of the test cavity 3 can be slightly larger than the outer perimeter of the thicker part of the door frame. It can even be made slightly larger than the outer perimeter of the door frame in some directions. However, it is still necessary to ensure that at least part of the outer perimeter of the door frame can be aligned with the test module. 2. After the outer periphery of the door frame is fixed to the test module 2, the thicker part of the door frame can be successfully placed into the test component fixing cavity 3. There may be a certain gap between the outer periphery of the thicker part of the door frame and the inner wall of the test component fixing cavity 3. In this embodiment, by installing a sound insulation module 1 of appropriate size at this gap, the subsequently fixed sound insulation module 1 ultimately covers the entire test component 4 along the direction perpendicular to the plate surface of the test component 4 to complete the final test. It should be understood that the sound insulation module 1 can at this time completely overlap or at least partially overlap with the test component 4 along the X direction. In some other embodiments, a portion of the test component 4 may be covered by the subsequently fixed sound insulation module 1 along the direction perpendicular to the plate surface of the test component 4, meaning that a portion of the test component 4 along the Z direction does not overlap with the sound insulation module 1.

[0040] In some optional embodiments, after fixing the sound insulation module 1 of the corresponding size to the inner wall of the test piece fixing cavity 3, the method includes: filling the gap between the sound insulation module 1 and the test piece 4 with sound insulation material. That is, since the test piece 4 has a certain thickness, when the outer periphery of the test piece 4 is fixed to the test module 2 and part of it extends into the test piece fixing cavity 3, the part of the test piece 4 extending into the test piece fixing cavity can overlap with the part of the sound insulation module 1 along the direction perpendicular to the plate surface of the test piece 4. At this time, although the part of the test piece 4 and the part of the sound insulation module 1 overlap with each other along the direction perpendicular to the plate surface of the test piece 4, there may still be some gaps between the test piece 4 and the sound insulation module 1 along the direction perpendicular to the plate surface of the test piece 4. In this embodiment, filling the gap with sound insulation material can make the test results more accurate. The sound insulation material can be fireproof putty or other sound insulation materials with a certain hardness.

[0041] This application embodiment also provides an NVH sound insulation test module, which may include: multiple sets of sound insulation modules 1, the multiple sets of sound insulation modules 1 having different sizes; the multiple sets of sound insulation modules 1 of different sizes are assembled to form a test component fixing cavity 3, each set of sound insulation modules 1 may have the same size, setting multiple sets of sound insulation modules 1 of different sizes can make the test component fixing cavity 3 formed by assembling the sound insulation modules 1 as close as possible to the outer periphery of the test component. In this application embodiment, the sound insulation modules 1 are provided with three sets of different sizes, and the size of each set of sound insulation modules 1 can be set in a certain proportion.

[0042] In some optional embodiments, each group of sound insulation modules 1 includes at least two sound insulation blocks 11 with the same size. The at least two sound insulation blocks 11 are fixed to each other. The two sound insulation blocks 11 in each group can be fixed by welding or by other methods such as adhesive bonding. Each sound insulation block 11 is filled with sound insulation material. That is, the different sizes formed by different groups of sound insulation modules 1 are set according to the size of the sound insulation blocks 11. In the embodiments of this application, each sound insulation block 11 has a cavity, and the sound insulation block 11 also has an injection hole. The staff can inject sound insulation material into the cavity through the injection hole to increase the surface density of the sound insulation block 11, so as to make the NVH sound insulation test results more realistic. In this embodiment, the sound insulation block 11 is designed with a cavity structure, which makes it more convenient to transport during actual use. It is also lighter, saving labor in both transportation and handling. When the sound insulation block 11 is needed for initial use, the worker fills the cavity with sound-insulating material, and subsequent uses do not require repeated filling. It should be understood that the sound-insulating material can be butyl rubber or other materials with sound-insulating properties. In some other embodiments, the sound insulation block 11 can also be designed without a cavity, such as being manufactured as a solid lead plate in the factory.

[0043] In some optional embodiments, the sound insulation blocks 11 in all groups of sound insulation modules 1 have the same thickness; the two sound insulation blocks 11 in each group of sound insulation modules 1 are arranged to overlap and interleave, and the distance between the sidewalls of the two sound insulation blocks 11 on the same side of the sound insulation module 1 is the same as the thickness of the sound insulation block 11, see [link to relevant documentation]. Figure 6 As shown, this arrangement minimizes the gap at the joint when two adjacent sound insulation modules 1 are spliced ​​together. Furthermore, when splicing the sound insulation modules 1, depending on the size of the test piece 4, to ensure that the size of the test piece 4 is as similar as possible to the size of the test piece's fixing cavity 3, two adjacent sound insulation modules 1 may be spliced ​​perpendicularly to each other, meaning the surfaces of two adjacent sound insulation modules 1 are perpendicular to each other. Therefore, setting the thickness of the sound insulation block 11 to be the same as the distance between the sidewalls on the same side of the two sound insulation blocks 11 minimizes the gap at the joint even when the surfaces of two adjacent sound insulation modules 1 are spliced ​​perpendicularly. It should be understood that under the above splicing method, the assembled test module 2 may not have a through seam along the direction perpendicular to the surface of the sound insulation test module 2, thereby reducing the influence of the test module 2 itself on the NVH sound insulation test results, and allowing the assembled test module 2 to be used without further sound insulation reinforcement.

[0044] In some alternative embodiments, see Figure 4 and Figure 7 As shown, each sound insulation block 11 is provided with two side sealing strips 111. Each side sealing strip 111 surrounds adjacent sides of the sound insulation block 11, and the two side sealing strips 111 are installed on different sides of the sound insulation block 11. The two side sealing strips 111 have a height difference along the thickness direction of the sound insulation block 11. It should be understood that the side sealing strips 111 can be a rubber material with certain sealing performance. When two adjacent sound insulation modules 1 are spliced, see... Figure 3 As shown, the side sealing strips 111 of the two sound insulation blocks 11 that are attached to each other in the two adjacent sound insulation modules 1 should have a height difference. That is, when splicing, care should be taken to avoid the side sealing strips 111 of the two sound insulation blocks 11 from overlapping each other. Since the side sealing strips 111 are made of adhesive material, pressing the two adjacent sound insulation modules 1 tightly during splicing can seal the joint of the two sound insulation modules 1 as much as possible.

[0045] In some optional embodiments, each of the two sound insulation blocks 11 in each group of sound insulation modules 1 has a face seal 112 on one side facing each other. Preferably, the face seal 112 can also be a rubber material with certain sealing performance, and the face seal 112 can be set in an "L" shape. The face seal 112 in each sound insulation block 11 is spaced apart from the other sound insulation block 11, that is, the face seal 112 does not contact the side wall of the sound insulation block 11. The face seal 112 of one sound insulation block 11 is located on the side close to the sound insulation block 11 it mates with, and the face seal 112 of the other sound insulation block 11 is located on the side away from the sound insulation block 11 it mates with. In this embodiment, in order to enable the test piece 4 to be bolted to the test module 2, bolt mounting holes 113 are provided in each sound insulation block 11. See Figure 7 As shown, the bolt mounting hole 113 can be located near the side edge of the sound insulation block 11. The two sound insulation blocks 11 in each sound insulation module 1 can be regarded as the first sound insulation block 11 and the second sound insulation block 11. In this case, the face seal 112 in the first sound insulation block 11 can be located on the side of the bolt mounting hole 113 in the first sound insulation block 11 that is close to the second sound insulation block 11. The face seal 112 in the second sound insulation block 11 is located on the side of the bolt mounting hole 113 in the second sound insulation block 11 that is far away from the first sound insulation block 11. When two adjacent sound insulation modules 1 are assembled, it is necessary to ensure that the face seals 112 in the two adjacent sound insulation modules 1 do not overlap. Under the action of the face seal 112, the sealing performance between the two adjacent sound insulation modules 1 can be further enhanced. In addition, when the panel of one sound insulation module 1 is spliced ​​perpendicularly to the panel of another sound insulation module 1, it should be ensured that the side seal 111 of one sound insulation module 1 does not overlap with the face seal 112 of another sound insulation module 1.

[0046] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0047] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An NVH (Noise, Vibration, and Harshness) insulation test method, characterized in that, It includes the following steps: Multiple sound insulation modules (1) of different sizes are spliced ​​together to form a test module (2) with a test component fixing cavity (3), including: Sound insulation modules (1) of different sizes are spliced ​​together to form a complete sound insulation wall, and some sound insulation modules (1) are removed from the sound insulation wall according to the shape of the test piece (4) to form a test module (2) with a test piece fixing cavity (3); Each of the sound insulation modules (1) includes at least two sound insulation blocks (11) of the same size, the at least two sound insulation blocks (11) are fixed to each other, and each sound insulation block (11) is filled with sound insulation material; The sound insulation blocks (11) in all groups of the sound insulation modules (1) have the same thickness; In each set of sound insulation modules (1), the two sound insulation blocks (11) are arranged to overlap and interleave each other, and the distance between the sidewalls on the same side of the two sound insulation blocks (11) is the same as the thickness of the sound insulation block (11); Each of the sound insulation blocks (11) is provided with two side seals (111), each of the side seals (111) is surrounded on the adjacent two sides of the sound insulation block (11), the two side seals (111) are installed on different sides of the sound insulation block (11), and the two side seals (111) have a height difference along the thickness direction of the sound insulation block (11); Each of the two sound insulation blocks (11) in each sound insulation module (1) has a face seal (112) on one side facing each other. The face seal (112) of each sound insulation block (11) is spaced apart from the other sound insulation block (11). The face seal (112) of one of the sound insulation blocks (11) is located on the side close to the sound insulation block (11) it cooperates with, and the face seal (112) of the other sound insulation block (11) is located on the side away from the sound insulation block (11) it cooperates with. The test piece (4) is fixed in the test piece fixing cavity (3) through the test module (2), and the NVH performance of the test piece (4) is tested.

2. The NVH sound insulation test method as described in claim 1, characterized in that, The step of fixing the test piece (4) into the test piece fixing cavity (3) via the test module (2) includes: The periphery of the test piece (4) is fixed to the test module (2), so that at least a part of the test piece (4) is located in the test piece fixing cavity (3).

3. The NVH sound insulation test method as described in claim 1, characterized in that, The step of fixing the test piece (4) into the test piece fixing cavity (3) via the test module (2) includes: Place the test piece (4) into the test piece fixing cavity (3) of the test module (2), and fix the test piece (4) around the test module (2); A sound insulation module (1) of the corresponding size is fixed on the inner wall of the cavity (3) of the test piece, so that the sound insulation module (1) covers the entire test piece (4) in a direction perpendicular to the plate surface of the test piece (4).

4. The NVH sound insulation test method as described in claim 3, characterized in that, After fixing the sound insulation module (1) of the corresponding size to the inner wall of the test piece fixing cavity (3), the following steps are included: Sound insulation material is filled in the gap between the sound insulation module (1) and the test piece (4).

5. An NVH (Noise, Vibration, and Harshness) insulation test module, characterized in that, It includes: Multiple sound insulation modules (1), the multiple sound insulation modules (1) having different sizes; Multiple sets of sound insulation modules (1) of different sizes are assembled to form a fixed cavity (3) for the test piece; Each of the sound insulation modules (1) includes at least two sound insulation blocks (11) of the same size, the at least two sound insulation blocks (11) are fixed to each other, and each sound insulation block (11) is filled with sound insulation material; The sound insulation blocks (11) in all groups of the sound insulation modules (1) have the same thickness; In each set of sound insulation modules (1), the two sound insulation blocks (11) are arranged to overlap and interleave each other, and the distance between the sidewalls on the same side of the two sound insulation blocks (11) is the same as the thickness of the sound insulation block (11); Each of the sound insulation blocks (11) is provided with two side seals (111), each of the side seals (111) is surrounded on the adjacent two sides of the sound insulation block (11), the two side seals (111) are installed on different sides of the sound insulation block (11), and the two side seals (111) have a height difference along the thickness direction of the sound insulation block (11); Each of the two sound insulation blocks (11) in each sound insulation module (1) has a face seal (112) on one side facing each other. The face seal (112) of each sound insulation block (11) is spaced apart from the other sound insulation block (11). The face seal (112) of one of the sound insulation blocks (11) is located on the side close to the sound insulation block (11) it cooperates with, and the face seal (112) of the other sound insulation block (11) is located on the side away from the sound insulation block (11) it cooperates with.

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