CN211061479U

CN211061479U - Material acoustics evaluation device

Info

Publication number: CN211061479U
Application number: CN201921964951.5U
Authority: CN
Inventors: 郑冠崔; 熊凌鹏; 王险峰
Original assignee: Guangzhou Linjun Co ltd
Current assignee: Guangzhou Linjun Co ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2020-07-21
Anticipated expiration: 2029-11-14

Abstract

The utility model relates to a material acoustics evaluation device, last test box including bottom open-ended, open-top's lower test box, a sample layer board for placing the sample that awaits measuring, the storage has the mobile terminal and the data storage of test noise to read the terminal, lower test box, the sample layer board, it stacks from up in proper order down to go up the test box, upward install the excitation source in the test box, install down the excitation source in the test box down, go up the top of test box and install wireless sound collector, wireless sound collector passes through signal communication transmission data to data storage and reads the terminal, mobile terminal respectively with last excitation source and excitation source signal communication hookup down. The utility model realizes the evaluation of the sound absorption and sound insulation of the material through a set of device; the device has the advantages of simple structure, small volume, small occupied area, portability, convenient movement and carrying and good portability; the required size of the test sample is small, and small test samples are easy to flatten; the testing method is simple, and testing evaluation can be completed by simple training of measuring personnel.

Description

Material acoustics evaluation device

Technical Field

The utility model relates to a material acoustics appraises technical field, especially relates to a material acoustics appraises device.

Background

The noise in the automobile is a key performance index of the automobile, the noise level is influenced by the active noise control of an engine of the whole automobile and the airtightness of the whole automobile, and a key control technology is to utilize the sound absorption and insulation characteristics of an acoustic part in the automobile to achieve the isolation of the noise at the bottom of the automobile and the absorption of the noise in the automobile, so that the noise in the automobile is reduced, and the riding experience of a user is improved.

Therefore, the sound absorption and insulation characteristics of the acoustic component in the vehicle are particularly important, and the sound absorption and insulation characteristics of the acoustic component in the vehicle are mainly influenced by the material of the acoustic component, so that the sound absorption and insulation characteristics of the material for manufacturing the acoustic component in the vehicle need to be tested and judged.

Generally speaking, requirements for acoustic properties of materials are divided into sound absorption and sound insulation, two different systems are required to be used for testing respectively, and quality judgment is performed according to each performance index of the systems. Such as the sound absorption rate at normal incidence, the sound absorption rate at the upper test box, the transmission loss, the insertion loss and other performance indexes. Although the test result is accurate and credible, the following problems exist: 1. sound absorption and sound insulation properties need different equipment to be correspondingly tested and are difficult to prepare; 2. the corresponding test analysis equipment has large investment, large floor area, heavy weight and poor mobility and portability; 3. the testing process is complicated and lengthy, and the requirement on professional quality of a measuring staff is high; 4. the test sample is required to be large in size and good in flatness.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above problem that prior art exists, provide a material acoustics evaluation device.

For realizing above-mentioned technical purpose, reach above-mentioned technological effect, the utility model discloses a following technical scheme realizes:

the utility model provides a material acoustics evaluation device, includes bottom open-ended test box, open-top's lower test box, is used for placing the sample layer board and the data storage reading terminal of the sample that awaits measuring, test box, sample layer board, last test box stack from up in proper order down, just the sample layer board will go up test box and test box down separate into two inclosed cavitys, and the sound propagation environment in two cavitys is unanimous, install the excitation source in going up the test box, install down the excitation source in the test box down, go up the top of test box and install wireless sound collector, wireless sound collector passes through signal communication transmission data extremely the data storage reading terminal.

Furthermore, the inner walls of the upper test box and the lower test box are uniformly distributed with sound reflection material layers or sound attenuation material layers.

Furthermore, a clamping groove is formed in the bottom of the upper test box, and the sample supporting plate is clamped in the clamping groove.

Further, the upper excitation source and the lower excitation source are bluetooth speakers.

Preferably, the wireless sound collector is a bluetooth microphone.

Preferably, the upper and lower test boxes are rectangular.

Preferably, the outer walls of the lower test chamber and the lower test chamber are coated with an acoustic felt.

The utility model has the advantages that: the utility model realizes the evaluation of the sound absorption and sound insulation of the material through a set of device; the device has simple structure, small volume, small occupied area, portability, convenient movement and transportation and good portability; the required size of the test sample is small, and small test samples are easy to flatten; the testing method is simple, and the testing evaluation can be completed by the measuring personnel only through simple training.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a perspective view of a material acoustic evaluation device in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an upper test box in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a lower testing box in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a sample support plate in an embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In the description of the present invention, it is to be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", and the like, indicate positional or positional relationships, are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

As shown in fig. 1 to 4, a material acoustic evaluation device includes an upper test box 1 with an opening at the bottom, a lower test box 3 with an opening at the top, and a sample supporting plate 2, wherein the lower test box 3, the sample supporting plate 2, and the upper test box 1 are sequentially stacked from bottom to top, the sample supporting plate 2 separates the upper test box 1 and the lower test box 3 into two closed areas, an upper excitation source 4 and a wireless sound collector 6 are arranged in the upper test box 1, a lower excitation source 3 is arranged in the lower test box, and sound propagation environments in the upper test box 1 and the lower test box 3 are consistent.

Go up test box 1 and include the first cavity 12 of bottom open-ended cuboid box-type, fixedly mounted has sound-proof felt 11 on each lateral surface of sound reflection material layer 13 first cavity 12 on each inside wall of first cavity 12.

As another preferred embodiment, a sound damping material layer can be fixedly mounted on each inner side wall of the first cavity 12, since the device adopts a comparative evaluation, and the sound absorption comparative evaluation can also be carried out in a sound damping environment.

Lower test box 3 includes second cavity 32 of bottom open-ended cuboid box type, and fixed mounting has amortization material layer 33 on each inside wall of second cavity 32, and fixed mounting has deadening felt 31 on each lateral surface of second cavity 32.

The bottom of the upper test box 1 is provided with a clamping groove 14, and the sample supporting plate 2 is clamped in the clamping groove 14, so that the sample supporting plate is aligned with the upper test box 1 and the lower test box 3 conveniently.

The upper excitation source 4 and the lower excitation source 5 are both Bluetooth sound devices so as to realize Bluetooth communication connection with the mobile terminal with the stored test noise. The wireless sound collector 6 is a Bluetooth microphone to realize Bluetooth communication connection with a data storage and reading terminal with a Bluetooth communication module, wherein sound pressure level monitoring software is preset in the data storage and reading terminal, so that sound pressure data collected by the wireless sound collector can be read out visually.

The upper test box 1 and the lower test box 2 are cuboid, and each side length is less than 40 cm.

A material acoustic evaluation method using the material acoustic evaluation device comprises the following steps:

step S10, device connection preparation: a data storage reading terminal with a Bluetooth communication module and a mobile terminal with test noise are installed, the wireless sound collector 6 is connected with the data storage reading terminal through Bluetooth communication, and the mobile terminal is respectively connected with the upper excitation source 4 and the lower excitation source 5 through Bluetooth communication;

s21, sound absorption testing of the first sample to be tested, namely, flatly paving the first sample to be tested on a sample supporting plate, opening an upper excitation source positioned in an upper testing box, stacking a lower testing box, the sample supporting plate and the upper testing box from bottom to top in sequence, clicking and playing white noise stored on a mobile terminal to enable the upper excitation source to emit the white noise, and analyzing by using a data storage and reading terminal to obtain sound pressure data SP L1 of the first sample to be tested;

step S22, sound absorption testing of a second sample to be tested, namely, flatly paving the second sample to be tested on a sample supporting plate, opening an upper excitation source positioned in an upper testing box, stacking a lower testing box, the sample supporting plate and the upper testing box from bottom to top in sequence, clicking and playing white noise stored on a mobile terminal to enable the upper excitation source to emit white noise, and analyzing by using a data storage and reading terminal to obtain sound pressure data SP L2 of the second sample to be tested;

step S23, comparing the sound pressure data of the first sample to be tested with the sound pressure data of the second sample to be tested, if SP L1 is more than SP L2, the sound absorption of the first sample to be tested is poorer than that of the second sample to be tested, if SP L1 = SP L2, the sound absorption of the first sample to be tested is the same as that of the second sample to be tested, and if SP L1 is less than SP L2, the sound absorption of the first sample to be tested is better than that of the second sample to be tested;

s31, performing sound insulation test on the first sample to be tested, namely directly paving the first sample to be tested on a sample supporting plate, opening a lower excitation source positioned in a lower test box, sequentially stacking the lower test box, the sample supporting plate and an upper test box from bottom to top, clicking and playing 1/3 frequency multiplication or full-band white noise stored on a mobile terminal, enabling the lower excitation source to send 1/3 frequency multiplication or full-band white noise, and analyzing by using a data storage reading terminal to obtain sound pressure data SP L3 of the first sample to be tested;

s32, performing sound insulation test on a second sample to be tested, namely directly paving the second sample to be tested on a sample supporting plate, opening a lower excitation source positioned in a lower test box, sequentially stacking the lower test box, the sample supporting plate and an upper test box from bottom to top, clicking to play 1/3 frequency doubling or full-band white noise stored on a mobile terminal, enabling the lower excitation source to send 1/3 frequency doubling or full-band white noise, and analyzing by using a data storage reading terminal to obtain sound pressure data SP L4 of the second sample to be tested;

step S33, comparing the sound pressure data of the first sample to be tested with the sound pressure data of the second sample to be tested, if SP L3 is larger than SP L4, the sound insulation of the first sample to be tested is lower than that of the second sample to be tested, if SP L3 = SP L4, the sound insulation of the first sample to be tested is the same as that of the second sample to be tested, and if SP L3 is smaller than SP L4, the sound insulation of the first sample to be tested is good as that of the second sample to be tested.

In the above embodiment, the test box can be simulated into an environment in an automobile, such as a reverberation chamber, each test box can be selectively placed with a plurality of excitation sources according to actual conditions, so as to test the sound absorption characteristics and the sound insulation characteristics of acoustic components in the automobile, but analysis of different properties of the same set of sample can be realized only by technical means of arranging two sets of sound production systems in two spaces, corresponding test analysis equipment has small investment, required resources are easy to obtain, the floor area of the test equipment is small, desktop placement can be realized, staff can complete test evaluation after simple training by optimizing the design and test flow of the test equipment, the sample installation is convenient, the test is simple and quick, the whole test can be completed within 2 minutes, the conclusion of the noise reduction effect of the material can be directly obtained by the test, and different materials have different noise reduction effects, its numerical value can directly compare and judge, the utility model discloses the device is comparatively light, can dismantle, make up, and the mobility is better.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A material acoustic evaluation apparatus characterized by: including bottom open-ended last test box, open-top's lower test box, be used for placing the sample layer board of the sample that awaits measuring, the mobile terminal and the data storage reading terminal that the storage has the test noise, test box, sample layer board, last test box stack from up in proper order down, just the sample layer board will last test box separates into two inclosed cavitys with lower test box, and the sound propagation environment in two cavitys is unanimous, install the excitation source in going up the test box, install down the excitation source in the test box down, go up the top of test box and install wireless sound collector, wireless sound collector passes through signal communication transmission data extremely data storage reading terminal, mobile terminal respectively with go up excitation source and excitation source signal communication hookup down.

2. The material acoustic evaluation apparatus according to claim 1, characterized in that: and sound reflection material layers or sound attenuation material layers are uniformly distributed on the inner walls of the upper test box and the lower test box.

3. The material acoustic evaluation apparatus according to claim 1, characterized in that: the bottom of going up the test box is provided with the draw-in groove, the sample layer board card is in the draw-in groove.

4. The material acoustic evaluation apparatus according to claim 1, characterized in that: the upper excitation source and the lower excitation source are Bluetooth sound devices.

5. The material acoustic evaluation apparatus according to claim 1, characterized in that: the wireless sound collector is a Bluetooth microphone.

6. The material acoustic evaluation apparatus according to claim 1, characterized in that: the upper test box and the lower test box are cuboid.

7. The material acoustic evaluation apparatus according to claim 1, characterized in that: the outer walls of the lower test box and the lower test box are coated with sound insulation felts.