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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

Active Publication Date: 2019-11-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, in order to directly separate the incident wave and the reflected wave in the time domain, the sound tube used in this method is longer than 1360mm. Due to the loss inside the sound tube, the longer the tube length, the greater the loss. Introduce errors, thereby affecting the test results of the final sound absorption coefficient; and the longer sound tube also has certain limitations in actual operation, such as some occasions that require on-site testing, too long sound tube is not convenient to carry

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

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Embodiment Construction

[0037] Embodiments of the present invention are described in detail below, and the embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0038]In this embodiment, the measurement of the vertical incidence sound absorption coefficient is carried out on the polymer material:

[0039] Such as figure 1 As shown, the portable device for measuring the sound absorption coefficient of materials based on the short sound tube pulse method proposed in this embodiment includes a speaker, a microphone, a portable air sound tube, a power amplifier, a signal generating device, and a data acquisition device;

[0040] The speaker model is Swans M3N, with a diameter of 90 mm and a flat response in the frequency range of 300-7000 Hz. The portable air acoustic tube is composed of a section of large-diameter cylindrical tube and a small-diameter cylindrical tube at one end. The acoustic tube is made of rigid mater...

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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.

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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Application Information

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IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/023
Inventor 侯宏卫政宇张萌飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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