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Test method for measuring sound absorption coefficient of sound absorption or sound insulation material by use of reverberation chamber

A technology of sound absorption coefficient and test method, which is applied in the analysis of solids by using sonic/ultrasonic/infrasonic waves, to reduce the test area, improve the test efficiency, and save the production cost.

Inactive Publication Date: 2012-04-25
WUXI GISSING AUTO ACOUSTIC PARTS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the measurement of the sound absorption coefficient of materials by the reverberation chamber method generally requires the area of ​​the material to be tested to be 10m2. 2 , the special area requirements lead to the limitations of the experimental method

Method used

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  • Test method for measuring sound absorption coefficient of sound absorption or sound insulation material by use of reverberation chamber
  • Test method for measuring sound absorption coefficient of sound absorption or sound insulation material by use of reverberation chamber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The reverberation box is R-Cabin reverberation box with a volume of 9m 3 , The cut-off frequency of the reverberation box is 400Hz, and the measurement frequency range is 400-10000Hz. The test sample is a car carpet.

[0018] (1) Connecting equipment: the equipment is placed in the reverberation room, and four microphones are installed in the reverberation box, and the microphones are respectively connected to the four channels of the four-channel test system. The distance is greater than or equal to 1m, and the distance from the reverberation box wall is greater than or equal to 50cm. The four-channel test system is connected to the power amplifier, and the power amplifier is connected to the computer. The connection between the four-channel test system and the microphone uses a BNC connector.

[0019] (2) Test preparation: turn on the signal generator, power amplifier and computer located on the four-channel test system, enter the software test interface in the com...

Embodiment 2

[0024] The reverberation box is R-Cabin reverberation box with a volume of 9m 3 , the cut-off frequency of the reverberation box is 400Hz, the measurement frequency range is 400-10000Hz, and the test sample is a vehicle cabin sound insulation pad.

[0025] (1) Connecting equipment: the equipment is placed in the reverberation room, and four microphones are installed in the reverberation box, and the microphones are respectively connected to the four channels of the four-channel test system. The distance is greater than or equal to 1m, and the distance from the reverberation box wall is greater than or equal to 50cm. The four-channel test system is connected to the power amplifier, and the power amplifier is connected to the computer. The connection between the four-channel test system and the microphone uses a BNC connector.

[0026] (2) Test preparation: turn on the signal generator, power amplifier and computer located on the four-channel test system, enter the software te...

Embodiment 3

[0032] The reverberation box is R-Cabin reverberation box with a volume of 9m 3 , the cut-off frequency of the reverberation box is 400Hz, the measurement frequency range is 400-10000Hz, and the test sample is a car hood sound insulation pad.

[0033] (1) Connecting equipment: the equipment is placed in the reverberation room, and four microphones are installed in the reverberation box, and the microphones are respectively connected to the four channels of the four-channel test system. The distance is greater than or equal to 1m, and the distance from the reverberation box wall is greater than or equal to 50cm. The four-channel test system is connected to the power amplifier, and the power amplifier is connected to the computer. The connection between the four-channel test system and the microphone uses a BNC connector.

[0034] (2) Test preparation: turn on the signal generator, power amplifier and computer located on the four-channel test system, enter the software test in...

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Abstract

The invention relates to a test method for measuring the sound absorption coefficient of a sound absorption or sound insulation material by the use of a reverberation chamber and belongs to the technical field of noise control. All equipment is firstly placed in the reverberation chamber. Four microphones are installed inside the reverberation chamber and are respectively connected with four channels of a four-channel test system, which is connected with a power amplifier. The power amplifier is connected with a computer. Then, a signal-generator, the power amplifier and the computer which are positioned on the four-channel test system are turned on so as to enter a software test interface of the computer and calibrate each microphone. Finally, vacant auditoria and reverberation time after the material to be measured is put into the reverberation chamber are measured and recorded, and the sound absorption coefficient of the material to be measured can be obtained after software processing. The test method is simple and easy to operate. By the adoption of the test method, the measurement result consists with the sound absorption effect of the material in practical construction projects, the cost for making test samples is greatly saved, and simultaneously the test efficiency is raised.

Description

technical field [0001] The present invention uses a reverberation box to measure the test method of the sound absorption coefficient of sound absorption or sound insulation materials, and is applicable to an area of ​​0.49-1.5m 2 The invention relates to the measurement of the sound absorption coefficient of any flat film material or sound-absorbing body, belonging to the technical field of noise control. Background technique [0002] At present, there are mainly two methods for sound absorption measurement of materials, namely standing wave tube method and reverberation time method. Limited by the measurement principle, the sound absorption coefficient of the material measured by the standing wave tube method is different from the sound absorption coefficient of the material in the actual project, while the sound absorption coefficient of the material measured by the reverberation time method is different from the sound absorption coefficient of the material in the actual p...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 王洁
Owner WUXI GISSING AUTO ACOUSTIC PARTS TECH CO LTD
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