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Device and method for testing sound absorbing performance of material

A testing method and testing device technology, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as large volume and limited test results, and achieve the effects of small size, wide application, and high testing accuracy

Inactive Publication Date: 2012-03-14
刘铁军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the test results are limited by the test conditions due to the large volume of the existing material sound absorption performance testing device. The present invention provides a material sound absorption performance test device and a testing method

Method used

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  • Device and method for testing sound absorbing performance of material
  • Device and method for testing sound absorbing performance of material
  • Device and method for testing sound absorbing performance of material

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Experimental program
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specific Embodiment approach 1

[0018] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, material sound-absorbing performance testing device, it comprises signal generator 1, power amplifier 2, sound insulation container 3, loudspeaker 4, sub-sound source partition 5, microphone 6, dynamic data acquisition instrument 8 and computer 9 ;

[0019] The inner wall of the sound insulation container 3 is provided with a shoulder, and the sub-sound source partition 5 is fixed on the shoulder, and the sound insulation container 3 is divided into upper and lower spaces, and the sub-sound source partition 5 and the sound insulation container 3 are parallel to the bottom surface, the test piece 7 is arranged on the bottom surface in the lower space of the sound insulation container 3, the microphone 6 is arranged between the sub-sound source partition 5 and the test piece 7, and the microphone 6 penetrates the side of the sound insulation container 3 The wall is fixed on the side w...

specific Embodiment approach 2

[0022] Embodiment 2. The difference between this embodiment and the device for testing the sound absorption performance of materials described in Embodiment 1 is that the sub-sound source partition 5 is a perforated steel plate with a thickness of 20 mm to 30 mm.

[0023] This embodiment is a small-volume diffuse-incidence sound absorption coefficient measuring device. In this embodiment, in order to generate a diffuse sound field in a small space, a porous thin steel plate is arranged under the sound source, and the diffraction effect of sound waves is used to transform one sound source into multiple irregular sound sources after being diffracted by the thin plate. The sound field generated by the superposition of multiple sound sources is a diffuse field, and the sound absorption performance test of the material is realized under the action of the diffuse field.

[0024] In this embodiment, steel with relatively high rigidity and specific gravity is used as the main material...

specific Embodiment approach 3

[0025] Embodiment 3. Based on the method for testing the sound absorption performance of materials described in Embodiment 1, it is realized by the following steps:

[0026] Step 1, using the signal generator 1 to generate a simple harmonic voltage signal of 50 Hz to 20000 Hz;

[0027] Step 2, the signal generated in step 1 is amplified by power amplifier 2, and the amplified signal is output through speaker 4;

[0028] Step 3, using the data acquisition instrument 8 to collect the time T used for the sound intensity in the sound insulation container 3 to attenuate by 10dB 10 , via the formula:

[0029] A 1 = Sα = 0.02677 V T 10

[0030] Calculate the sound absorption A of the sound insulation container 3 in the state of no test piece 1 ;

[0031] Among them: V is the volume of the sound insulation container...

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Abstract

The invention relates to a method for testing the sound absorbing performance of a material, which are used for solving the problem of the limit of the test condition on the test result caused by the large size of the conventional device for testing the sound absorbing performance of a material. The device comprises a sound source system and a sound intensity test system, wherein the sound source system consists of a signal generator, a power amplifier and a loudspeaker, and is used for generating a sound signal for testing; and the measuring system consists of a sensor and a data acquisition unit, and is used for acquiring test data and computing a test result. The method comprises the following step of: calculating the sound absorbing coefficients of a test piece by testing the sound absorbing amounts A2 and A1 in the presence and absence of the test piece. The method is suitable for testing the sound absorbing performance of a material.

Description

technical field [0001] The invention relates to a sound absorption performance test device and a test method. Background technique [0002] At present, there are mainly two kinds of measurement devices for sound absorption coefficient, impedance tube method and coagulation chamber method. The experimental devices of these two methods are relatively large in volume and relatively high in cost, so that the test results are limited by the test conditions. At present, there is a lack of small-volume sound absorption coefficient measuring devices. Contents of the invention [0003] The purpose of the invention is to solve the problem that the test results are limited by test conditions due to the large volume of the existing material sound absorption performance testing device, and the invention provides a material sound absorption performance test device and a testing method. [0004] Material sound absorption performance testing device, which includes a signal generator, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/11
Inventor 刘铁军钟坤周笃建
Owner 刘铁军
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