Portable device and measurement method for measuring sound absorption coefficient of material based on short sound tube pulse method

A technology of sound absorption coefficient and portable device, applied in the direction of analyzing materials, analyzing solids using sonic/ultrasonic/infrasonic waves, instruments, etc., can solve the problems of large loss, sound pressure error, and inconvenient portability of the sound tube, and shorten the sound tube. Length, reduce impact, remove the effect of limiting the test frequency range
CN110501427AActive Publication Date: 2019-11-26NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2019-11-26

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Abstract

The invention provides a portable device and a measurement method for measuring the sound absorption coefficient of a material based on short sound tube and superimposed pulse extraction. According tothe propagation characteristics of a plane wave in a sound tube, direct and incident waves superimposed in the short sound tube are extracted through operations such as proper shift addition, and thevertical incident sound absorption coefficient of the material is calculated. The physical meaning is clear and the operation is simple. The length of the tube used by the method is short, which avoids the problem of frequency limitation of a transfer function method and the problem of sound attenuation of a pulse separation method. The convenience of the experimental operation is improved, and conditions are provided for the portable pulse method.
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Description

technical field

[0001] The invention relates to the field of measuring the sound absorption coefficient of materials at vertical incidence, in particular to a portable device and a measurement method for measuring the sound absorption coefficient of materials based on short sound tubes and superimposed pulse extraction. Background technique

[0002] In the field of material acoustic parameter measurement, the commonly used measurement techniques for vertical incidence sound absorption coefficient of materials mainly include standing wave ratio method, transfer function method and time domain pulse separation method.

[0003] Among them, the standing wave ratio method uses the ratio of the maximum value to the minimum value of the standing wave amplitude formed by the plane wave in the impedance tube and the location of the minimum value to determine the reflection coefficient, surface acoustic impedance or acoustic admittance of the sample and Normal incidence sound absorpti...

Claims

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