CN211505342U - Noise reduction effect test assembly of noise reduction assembly - Google Patents
Noise reduction effect test assembly of noise reduction assembly Download PDFInfo
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- CN211505342U CN211505342U CN202021654800.2U CN202021654800U CN211505342U CN 211505342 U CN211505342 U CN 211505342U CN 202021654800 U CN202021654800 U CN 202021654800U CN 211505342 U CN211505342 U CN 211505342U
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Abstract
The utility model relates to the technical field of automobiles, and discloses a testing component for the noise reduction effect of a noise reduction component, which comprises a transmitting chamber (10), a receiving chamber (20) adjacent to the transmitting chamber, a sound generating device (11) arranged in the transmitting chamber, a partition wall (30) arranged between the receiving chamber and the transmitting chamber, an adjusting device arranged in the receiving chamber and a sound pressure measuring device (40) arranged in the transmitting chamber and the receiving chamber; the partition wall is used for installing the noise reduction assembly, the sound production device is used for producing a diffusion sound field, the adjusting device is used for adjusting the sound absorption quantity of the receiving chamber, and the sound pressure measuring device is used for measuring the sound field sound pressure level of the transmitting chamber and the sound field sound pressure level of the receiving chamber. The utility model provides a test assembly can accomplish the measurement to the noise reduction effect of the subassembly of making an uproar under the condition that does not use the sample car when measuring the noise reduction effect of car acoustics package.
Description
Technical Field
The utility model relates to the field of automotive technology, specifically relate to a test component of noise reduction effect of subassembly of making an uproar falls.
Background
For promoting the endurance mileage, the electric vehicle often adopts lightweight acoustic package, such as before enclosing in the interior sound insulation parts such as pad and carpet. The lightweight acoustic package is different from the traditional double-wall sound insulation performance of 'metal plate and sound absorption layer and heavy layer', but adopts a lightweight structure without a heavy layer, such as double-component sound absorption cotton. The sound insulation performance is made up by improving the surface sound absorption coefficient of the part structure, so that the comprehensive noise reduction effect of the part is basically unchanged.
In the development process, the comprehensive actual noise reduction effect of the part can be measured only by being installed in an engineering sample car, and the sound insulation performance and the sound absorption performance of the part can be measured only in an acoustic test room (a sound attenuation room and a transmitting room) in the early stage. The early evaluation of the actual comprehensive effect of the lightweight acoustic package is seriously influenced, so that the optimization of the noise reduction performance of parts is influenced.
Disclosure of Invention
The utility model aims at providing a test component of the noise reduction effect of the subassembly of making an uproar falls in order to overcome the inconvenient problem of the test of making an uproar falls of the subassembly of making an uproar that prior art exists to the car.
In order to achieve the above object, an aspect of the present invention provides a testing assembly for noise reduction effect of a noise reduction assembly, the testing assembly including a transmitting chamber, a receiving chamber adjacent to the transmitting chamber, a sound generating device disposed in the transmitting chamber, a partition wall disposed between the receiving chamber and the transmitting chamber, an adjusting device disposed in the receiving chamber, and a sound pressure measuring device disposed in the transmitting chamber and the receiving chamber; the partition wall is used for installing the noise reduction assembly, the sound production device is used for producing a diffused sound field, the adjusting device is used for adjusting the sound absorption quantity of the receiving chamber, and the sound pressure measuring device is used for measuring the sound field sound pressure level of the transmitting chamber and the sound field sound pressure level of the receiving chamber
By the technical proposal, the testing component provided by the utility model can test the noise reduction effect of the automobile acoustic bag, the sound production device is arranged in the transmitting chamber so as to generate a diffused sound field, the receiving chamber is used for simulating the structure of the passenger compartment of the automobile, the adjusting device arranged in the receiving chamber can adjust the sound absorption capacity of the receiving chamber, so that the reverberation time in the receiving room is consistent with the reverberation time of the target in the vehicle, the sound wave generated in the transmitting room can be transmitted to the receiving room through the partition wall, the method comprises the steps that an automobile acoustic bag to be tested is arranged on a partition wall, the sound absorption side face of the automobile acoustic bag faces the direction of a receiving chamber, the sound pressure measuring devices arranged in a transmitting chamber and the sound pressure measuring devices arranged in the receiving chamber are used for measuring the sound field sound pressure level of the transmitting chamber and the sound field sound pressure level of the receiving chamber respectively, the sound pressure extreme difference between the transmitting chamber and the receiving chamber is the comprehensive noise reduction effect of the tested automobile acoustic bag, and the sound pressure extreme difference is equivalent to the sound pressure level change of the front automobile and the rear automobile of the parts of the acoustic bag arranged on. The utility model provides a test assembly can accomplish the measurement to the noise reduction effect of the subassembly of making an uproar under the condition that does not use the sample car when measuring the noise reduction effect of car acoustics package.
Optionally, the adjusting device comprises a diffuser plate and a connecting rod, a first end of the connecting rod is disposed on an inner wall of the receiving chamber, and the diffuser plate is rotatably mounted at the other end of the connecting rod.
Optionally, the test assembly includes the round pin axle, the diffuser plate includes the otic placode, the otic placode setting is in on the face of diffuser plate, be formed with the through-hole on the connecting rod, the round pin axle runs through the through-hole with the otic placode is so that the diffuser plate can wind the round pin axle takes place to rotate.
Optionally, the receiving chamber and the side of the launching chamber are contiguous, the first end of the connecting rod being disposed on an inner wall of the top of the receiving chamber.
Optionally, the connecting rod is arranged along a vertical direction, the pin shaft is arranged along a horizontal direction, and the surface of the diffusion plate is parallel to the pin shaft.
Optionally, the diffuser plate and the ear plate are an integrally formed piece.
Optionally, the surface of the diffusion plate is square, and the ear plate is disposed at the center of the surface of the diffusion plate.
Optionally, a plurality of the connecting rods are uniformly arranged on the inner wall of the top of the receiving chamber.
Optionally, the emission chamber is a cuboid.
Optionally, the diffuser plate is an acrylic plate.
Drawings
FIG. 1 is a schematic view of a noise reduction assembly testing the noise reduction effect of a noise reduction assembly according to a preferred embodiment of the present invention;
FIGS. 2-3 are schematic illustrations of a diffuser plate of a tuning device of a test assembly of the noise reduction effect of the noise reduction assembly of FIG. 1 in different rotational positions.
Description of the reference numerals
10-emitting room 11-sounding device
20-receiving chamber 21-diffuser plate 22-connecting rod
30-partition wall 40-sound pressure measuring device 50-pin shaft.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
As shown in fig. 1, the present invention provides a testing assembly for noise reduction effect of a noise reduction assembly, which comprises a transmitting chamber 10, a receiving chamber 20 adjacent to the transmitting chamber 10, a sound generating device 11 disposed in the transmitting chamber 10, a partition wall 30 disposed between the receiving chamber 20 and the transmitting chamber 10, an adjusting device disposed in the receiving chamber 20, and a sound pressure measuring device 40 disposed in the transmitting chamber 10 and the receiving chamber 20; the partition wall 30 is used for mounting the noise reduction assembly, the sound generating device 11 is used for generating a diffuse sound field, the adjusting device is used for adjusting the sound absorption amount of the receiving chamber 20, and the sound pressure measuring device 40 is used for measuring the sound field sound pressure level of the transmitting chamber 10 and the sound field sound pressure level of the receiving chamber 20.
The utility model provides a test assembly can test the noise reduction effect of car acoustics package, sound generating mechanism 11 sets up in launching room 10 so as to produce the diffusion sound field, receiving room 20 is used for simulating the structure in vehicle passenger cabin, the adjusting device who sets up in receiving room 20 can adjust the sound absorption capacity of receiving room 20, thereby make reverberation time in the receiving room 20 unanimous with the target reverberation time in the car, the sound wave that produces in launching room 10 can pass through the division wall 30 and transmit to receiving room 20 in, the car acoustics package that will carry out the test sets up on division wall 30 and the sound absorption side of car acoustics package is towards receiving room 20 direction, utilize the sound pressure measuring device 40 that sets up in launching room 10 and receiving room 20 to measure the sound pressure level of launching room 10 and the sound pressure level of receiving room 20 respectively, the sound pressure range of both sound fields is the comprehensive effect of the car acoustics package that tests, the acoustic bag component is equal to the sound pressure level change in the front and the back of the engineering sample vehicle. The utility model provides a noise reduction assembly's noise reduction's test assembly can accomplish the measurement to the comprehensive noise reduction effect of car acoustics package under the condition that does not use the sample car. It is certainly required to explain, the utility model provides a test assembly is not limited to the noise reduction effect of test car acoustics package, also can test the noise reduction effect of the noise reduction assembly in building field or other fields.
Under the condition of testing the noise reduction effect of car acoustics package, before engineering sample car is accomplished, utilize the utility model provides a test assembly just can once only accomplish each acoustics spare part, for example before enclose the test of the comprehensive noise reduction effect of pad, carpet.
Wherein, seted up the opening on the division wall 30, car acoustics package can set up on the opening, and the sound absorption side of acoustics package is towards receiving chamber 20, specifically, can adopt the wooden frame to fill in on the opening that sets up on division wall 30, then set up the installing port of equipping in car acoustics package on the wooden frame, for example the installing port of enclosing the panel beating before the adaptation, will before enclose metal sheet and sound insulation pad set up jointly in the wooden frame can. A plurality of different wood frames can be manufactured, on one hand, the wood frames can be plugged into the opening in the partition wall 30, and on the other hand, the different wood frames can be respectively matched with floor metal plates, ceiling metal plates, plane steel plates and the like.
The adjusting device can be selected to have a proper structure, and in the preferred embodiment of the present invention, as shown in fig. 1, the adjusting device includes a diffusion plate 21 and a connection rod 22, the first end of the connection rod 22 is disposed on the inner wall of the receiving chamber 20, the diffusion plate 21 is rotatably mounted at the other end of the connection rod 22, and the diffusion area of the sound wave in the receiving chamber 20 can be adjusted by rotating the diffusion plate 21, so that the reverberation time of the receiving chamber 20 is consistent with the target reverberation time in the vehicle. Specifically, by rotating the diffuser plate 21 and measuring the reverberation time of the receiving chamber 20 at this time, the rotational position of the diffuser plate 21 may be adjusted a plurality of times so that the reverberation time of the receiving chamber 20 coincides with the in-vehicle target reverberation time.
As shown in fig. 2 and 3, the diffusion plate 21 includes an ear plate, the ear plate is disposed on the surface of the diffusion plate 21, a through hole corresponding to the hole on the ear plate is formed on the connection rod 22, and the test assembly further includes a pin 50, the pin 50 penetrates through the through holes on the ear plate and the connection rod 22, so that the diffusion plate 21 and the connection rod 22 can be rotatably connected, and the diffusion plate 21 can rotate.
The diffuser plate 21 may be an acrylic plate, on one hand, the sound absorption coefficient of the acrylic plate is low; on the other hand, the plate of the diffuser plate 21 and the ear plate thereon may be made of acrylic material and configured as an integrally formed part, so that the connection of the ear plate is more secure. In a more preferred embodiment, the diffusion plate 21 has a square plate surface, and the lug plate is provided at the center of the square plate surface.
Referring to the structure shown in fig. 1, the sides of the receiving chamber 20 and the emitting chamber 10 are abutted, the first end of the connection rod 22 is disposed on the inner wall of the top of the receiving chamber 20, and the diffusion plate 21 is disposed on the connection rod 22 in a suspended form. Wherein, an interference connection is formed between the ear plate of the diffusion plate 21 made of an acrylic material and the pin 50, so that the diffusion plate 21 can rotate and be positioned at each desired position without shaking or dropping due to the gravity of the diffusion plate 21 itself.
When the diffusion plate 21 rotates, the angle between the diffusion plate 21 and the inner wall of the receiving chamber 20 changes, so that the area of the diffusion plate 21 directly facing the sound field in the receiving chamber 20 changes, and since the sound absorption coefficient of the diffusion plate 21 is low, the rotation of the diffusion plate 21 is equivalent to adjusting the sound absorption amount of the receiving chamber 20, so that the reverberation time of the receiving chamber 20 is consistent with the target reverberation time in the vehicle.
In addition, as shown in fig. 1, a plurality of connection rods 22 and a diffusion plate 21 at a second end of the connection rods 22 are disposed on the inner wall of the top of the receiving chamber 20, and the connection rods 22 are uniformly distributed on the inner wall of the top of the receiving chamber 20, so that the adjustment of the diffusion area of the sound field is more convenient and regular.
In a preferred embodiment of the present invention, the volume of the receiving chamber 20 may be in the range of 11.5 cubic meters to 12.5 cubic meters, more preferably 12 cubic meters, and configured to simulate the shape of a cab, the launching chamber 10 is a cuboid, 3 meters high, 4 meters wide, 5 meters long, and the launching chamber 10 has an area of 3 × 4 square meters facing the receiving chamber 20.
The following describes a specific method of using the test assembly provided by the present invention. Taking the noise reduction effect of the test automobile acoustic bag as an example, firstly, the automobile acoustic bag is arranged in a window formed in the partition wall 30, and the sound absorption side surface of the acoustic bag faces the receiving chamber 20; rotating the diffusion plate 21 and measuring the reverberation time of the receiving chamber 20 at this time so that the in-vehicle target reverberation time of the receiving chamber 20 is uniform; determining the frequency spectrum characteristics of the main sound source outside the vehicle and adjusting the sound production characteristics of the sound production device 11 according to the characteristics to ensure that the frequency spectrum distribution of the sound field of the emission chamber 10 is consistent with the frequency spectrum characteristics of the main sound source outside the vehicle; then, the sound field sound pressure level of the transmitting chamber 10 and the sound field sound pressure level of the receiving chamber 20 are measured by the sound pressure measuring means 40; the sound pressure level difference at the two sides is the comprehensive noise reduction effect of the automobile acoustic package parts, and is equal to the sound pressure level change in the front and the back of the automobile acoustic package arranged on the engineering sample vehicle.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical scheme of the utility model in the technical conception scope, can be right carry out multiple simple variant. Including each of the specific features, are combined in any suitable manner. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.
Claims (10)
1. A test assembly for testing the noise reduction effect of a noise reduction assembly, characterized in that the test assembly comprises a transmission chamber (10), a receiving chamber (20) adjoining the transmission chamber (10), a sound generating device (11) arranged in the transmission chamber (10), a partition wall (30) arranged between the receiving chamber (20) and the transmission chamber (10), an adjusting device arranged in the receiving chamber (20), and a sound pressure measuring device (40) arranged in the transmission chamber (10) and the receiving chamber (20); the partition wall (30) is used for mounting the noise reduction assembly, the sound production device (11) is used for producing a diffused sound field, the adjusting device is used for adjusting the sound absorption amount of the receiving chamber (20), and the sound pressure measuring device (40) is used for measuring the sound field sound pressure level of the transmitting chamber (10) and the sound field sound pressure level of the receiving chamber (20).
2. Assembly for testing the noise reduction effect of a noise reduction assembly according to claim 1, characterized in that said adjustment means comprise a diffuser plate (21) and a connecting rod (22), a first end of said connecting rod (22) being arranged on the inner wall of said receiving chamber (20), said diffuser plate (21) being rotatably mounted at the other end of said connecting rod (22).
3. The noise reduction assembly of claim 2, wherein the testing assembly comprises a pin (50), the diffuser plate (21) comprises an ear plate, the ear plate is disposed on the plate surface of the diffuser plate (21), a through hole is formed on the connecting rod (22), and the pin (50) penetrates through the through hole and the ear plate to enable the diffuser plate (21) to rotate around the pin (50).
4. Assembly for testing the noise reduction effect of a noise reduction assembly according to claim 3, characterized in that the sides of the receiving chamber (20) and the emission chamber (10) are contiguous, the first end of the connecting rod (22) being arranged on the inner wall of the top of the receiving chamber (20).
5. Assembly for testing the noise reduction effect of a noise reduction assembly according to claim 3, characterized in that said connecting rod (22) is arranged in a vertical direction, said pin (50) is arranged in a horizontal direction, and the plate surface of said diffuser plate (21) is parallel to said pin (50).
6. Assembly for testing the noise reduction effect of a noise reduction assembly according to claim 3, characterized in that the diffuser plate (21) and the ear plate are an integral piece.
7. The noise reduction assembly of claim 3, wherein the plate surface of the diffuser plate (21) is square, and the lug plate is disposed at the center of the plate surface of the diffuser plate (21).
8. Assembly for testing the noise reduction effect of a noise reduction assembly according to claim 4, characterized in that a plurality of said connecting rods (22) are arranged uniformly on the inner wall of the top of said receiving chamber (20).
9. Assembly for testing the noise reduction effect of a noise reduction assembly according to claim 8, characterized in that said emission chamber (10) is a cuboid.
10. Assembly according to any of claims 2-9, wherein the diffuser plate (21) is an acrylic plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021654800.2U CN211505342U (en) | 2020-08-11 | 2020-08-11 | Noise reduction effect test assembly of noise reduction assembly |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021654800.2U CN211505342U (en) | 2020-08-11 | 2020-08-11 | Noise reduction effect test assembly of noise reduction assembly |
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| CN211505342U true CN211505342U (en) | 2020-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112802441A (en) * | 2020-12-29 | 2021-05-14 | 盈普声学（惠州）有限公司 | Method and system for detecting noise reduction effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112802441A (en) * | 2020-12-29 | 2021-05-14 | 盈普声学（惠州）有限公司 | Method and system for detecting noise reduction effect |
| CN112802441B (en) * | 2020-12-29 | 2024-04-19 | 盈普声学（惠州）有限公司 | Method and system for detecting noise reduction effect |
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