Measuring device and measuring method for acoustic absorption coefficient and sound reduction index of sound wave oblique incidence material

Abstract

The invention relates to a measuring device and a measuring method for an acoustic absorption coefficient and a sound reduction index of a sound wave oblique incidence material and belongs to the field of acoustical measurement. A loudspeaker is connected with a sound transmission tube; the other end of the sound transmission tube is connected with a first opening of a three-way pipe fitting; a sound absorption tail end pipe A is arranged at one end of a reflection tube; the other end of the reflection tube is connected with a second opening of the three-way pipe fitting; mounting holes are formed in the sound transmission tube and the reflection tube; sound conducting apparatuses are arranged in the mounting tubes; the three-way pipe fitting is a different-diameter three-way pipe fittingor an equal-diameter three-way pipe fitting; a third opening of the different-diameter three-way pipe fitting is connected with a specimen tube; a third opening of the equal-diameter three-way pipe fitting is connected with one end of a refraction tube. The measuring device and the measuring method disclosed by the invention have the advantage that the acoustic absorption coefficient and the soundreduction index of a material with the frequency from 100 to 1600Hz can be realized; in addition, a sample required by the device is small, the equipment is simple and the operation can be realized in an ordinary laboratory.

Description

technical field [0001] The invention relates to the field of acoustic measurement, in particular to a measurement device and method for measuring the sound absorption coefficient and sound insulation of oblique sound incident materials. Background technique [0002] With the development of modern industry, transportation and urban construction, environmental noise pollution has become one of the most influential public hazards. The use of sound-absorbing materials and sound-insulating materials is the main measure taken by passive control technology to control noise. In terms of acoustics, the main parameters for evaluating the acoustic performance of materials are: sound absorption coefficient and sound insulation. The methods for measuring sound absorption coefficient and sound insulation in the laboratory mainly include: reverberation chamber method and impedance tube method. [0003] The principle of measuring the sound absorption coefficient of materials by the reverbe...

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Problems solved by technology

[0007] The object of the present invention is to provide a sound absorption coefficient and sound insulation measurement device and its measurement method for obliquely incident sound waves, which solves the problem that the impedance tube in the prior art can only measure the sound absorption coefficient and sound insulation of materials when sound waves are vertically incident. question

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