Six-microphone three-dimensional sound intensity method sound absorption coefficient measurement system and measurement method thereof

Abstract

The invention discloses a six-microphone three-dimensional sound intensity method sound absorption coefficient measurement system and a measurement method thereof. The system comprises a PC, a sound card, a power amplifier, a regular dodecahedron loudspeaker, a sound absorption coefficient measurement device, a six-microphone three-dimensional sound intensity probe, a display, a to-be-measured material or component, a total reflection plate and a sound-proof baffle. The PC, the power amplifier and the regular dodecahedron loudspeaker are connected in sequence to form a sound production module to generate a non-directional sound wave signal; the sound absorption coefficient measuring device is respectively connected with the six-microphone three-dimensional sound intensity probe and the display to form a sound receiving module; the sound production module and the sound receiving module are located on the two sides of a to-be-tested material or component respectively, and the sound-tight baffle is arranged between the sound production module and the sound receiving module and shields direct sound of the regular dodecahedron loudspeaker; and the total reflection plate is vertical to the sound-proof baffle. According to the invention, measurement can be carried out according to the actual installation condition of the material, and measurement can be carried out in an anechoic chamber and also can be carried out in places with general conditions.

Description

technical field [0001] The invention relates to the technical field of sound absorption coefficient measurement, in particular to a six-microphone three-dimensional sound intensity method sound absorption coefficient measurement system and a measurement method thereof. Background technique [0002] The sound absorption coefficient is an important parameter to measure the acoustic properties of materials. Therefore, accurate measurement of the sound absorption coefficient of materials at each frequency has an important impact on the rational use of various sound-absorbing materials or sound-absorbing structures in architectural spaces. At present, the laboratory methods for measuring the sound absorption coefficient mainly include the impedance tube method and the reverberation chamber method. Both of these two methods need to measure the sound absorption coefficient of the material or structure in the laboratory, but in actual application, the on-site environmental condition...

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Problems solved by technology

[0004] In order to overcome the defects and deficiencies of the existing sound absorption coefficient measurement methods, which have high requirements on materials and cannot measure the sound absorption coefficient of materials under actual installation conditions, the present invention provides a six-microphone three-dimensional sound intensity method sound absorption coefficient measurement system and its measurement Method, the present invention is based on the three-dimensional sound intensity method, utilizes the vector characteristic of sound intensity, by respectively measuring the incident sound intensity and reflected sound intensity at the six-microphone three-dimensional sound intensity probe and their vector information, calculates the sound intensity reflection coefficient, and then According to the relationship between the sound absorption coefficient and the sound intensity reflection coefficient, the sound absorption coefficient of the material is obtained, and at the same time, the incident angle of the sound source is calculated by using the vector information of the three-dimensional sound intensity, and the measurement frequency of the material can be obtained immediately after the signal collection is completed. The sound absorption coefficient and the incident angle of the sound source can measure the sound absorption coefficient of the material under the oblique incident angle, and the measurement is simple

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