Method and device for measuring random incidence sound-absorbing coefficient/sound-absorbing quantity of material

A technology of sound absorption coefficient and measurement method, which is applied in the field of acoustics, can solve the problems of low test efficiency and poor precision, and achieve the effects of avoiding errors and errors, improving precision and efficiency, and improving the level of automation

Active Publication Date: 2014-03-26
TONGJI UNIV +1
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Problems solved by technology

These problems have led to the disadvantages of low test eff

Method used

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  • Method and device for measuring random incidence sound-absorbing coefficient/sound-absorbing quantity of material
  • Method and device for measuring random incidence sound-absorbing coefficient/sound-absorbing quantity of material
  • Method and device for measuring random incidence sound-absorbing coefficient/sound-absorbing quantity of material

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Embodiment

[0038] Such as figure 1As shown, the measurement device for random incident sound absorption coefficient of materials includes a signal transmitting module 11 , a signal collecting module 12 , a signal processing module 13 , a result display module 14 , a storage and report generating module 15 and an offline analysis module 16 . Described signal transmitting module 11 is responsible for sending frequency-sweeping sound signal to the reverberation chamber, and described signal processing module 13 is respectively connected with signal transmitting module 11, signal acquisition module 12, result display module 14, storage and report generation module 15, The offline analysis module 16 is connected with the signal processing module 13 , and the signal processing module 13 is connected with the result display module 14 and the storage and report generation module 15 .

[0039] The signal transmitting module 11 includes a digital signal generating unit, a digital-to-analog convers...

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Abstract

The invention relates to a method and device for measuring random incidence sound-absorbing coefficient/sound-absorbing quantity of a material. The method comprises the following steps: 1) a signal transmitter module sends out a frequency sweeping sound signal into a reverberation room; 2) a signal acquisition module acquires sound pressure signals of the reverberation room before and after the placing of a test piece respectively; 3) a signal processing module calculates the impulse responses of the reverberation room before and after the placing of the test piece respectively, the sound pressure level attenuation and fitting data of each frequency band, and reverberation time, and calculates the sound-absorbing coefficient/sound-absorbing quantity of the frequency band of the test piece and the noise reduction index NRC; 4) a result display module displays the sound pressure level attenuation and the matched curve of the frequency band, a reverberation time list, and a sound-absorbing coefficient/sound-absorbing quantity list and curve; 5) a storage and statement generation module stores the impulse responses and the results, and generates a test report; 6) an off-line analysis module can perform in-depth signal analysis by invoking the stored impulse responses. The method and device have the advantages of high precision, high speed, integrated data processing and the like.

Description

technical field [0001] The invention relates to a measurement technology in the field of acoustics, in particular to a method for measuring the random incident sound absorption coefficient or sound absorption of a material and a measurement device thereof. Background technique [0002] The sound absorption performance of materials in the actual sound field is often expressed by random incident sound absorption coefficient or sound absorption. The reverberation chamber method uses the relationship between reverberation time and sound absorption to measure the random incident sound absorption coefficient or sound absorption of materials. The measured sound field is relatively close to the actual sound field, so the sound absorption coefficient or sound absorption measured by this method is often used as the basis for hall acoustic design and environmental noise control design. Accurately measuring the random incidence sound absorption coefficient or sound absorption of materi...

Claims

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Application Information

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IPC IPC(8): G01N29/14
Inventor 刘海生杨春庄李文婷
Owner TONGJI UNIV
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