Measuring system for material normal direction incidence acoustical absorption coefficient and acoustic impedance

Abstract

The invention relates to a measuring system for material normal direction incidence acoustical absorption coefficient and acoustic impedance. The measuring system comprises a signal transmitter module, an impedance tube, a signal acquisition module, a signal processing module, a signal display module and a report generation module, wherein the signal transmitter module, the impedance tube and the signal acquisition module are connected in sequence, the signal processing module is respectively connected with the signal acquisition module, the signal display module and the report generation module, the signal transmitter module sends out single frequency sinusoidal acoustical signals to the impedance tube, the signal acquisition module acquires the acoustic pressure signal in the impedance tube in real time, and transmits to the signal processing module, the signal processing module displays the received real time acoustic pressure signal through the signal display module, the material normal direction incidence acoustical absorption coefficient and acoustic impedance are calculated through the adoption of a standing wave ratio method, finally the calculated result is generated through the report generation module, and a testing report is stored. Compared with the prior art, the measuring system has the advantages that the measuring process is straightforward, and the measuring accuracy and efficiency are high.

Description

technical field [0001] The invention relates to a measurement technology in the field of acoustics, in particular to a measurement system for the normal incident sound absorption coefficient and acoustic impedance of materials. Background technique [0002] When a sound wave is incident on a sound-absorbing material, part of the sound wave is absorbed and the other part is reflected. Therefore, the sound absorption coefficient is defined as the ratio of the sound energy absorbed by the sound-absorbing material to the incident sound energy, reflecting the strength of the sound-absorbing ability of the material. The standing wave ratio method measures the normal incident sound absorption coefficient and acoustic impedance of the material, which is usually used for the comparison of the sound absorption performance of materials and the modeling of the finite element / boundary element sound field prediction model. The measurement principle of the standing wave ratio method is: t...

AI Technical Summary

Problems solved by technology

[0003] The traditional test method is limited by the display accuracy of the analog measurement system. When measuring the position of the maximum value, the minimum value and the first minimum value of the sound pressure, the accuracy is poor and the efficiency is low; the test results and test reports must be manually calculated and edited Can only be obtained, low efficiency, error-prone

Images