Device and method for testing impedance characteristic and expansion performance of sound absorption material

Abstract

The invention discloses a device and a method for testing the impedance characteristic and the expansion performance of a sound absorption material, and relates to the technical field of material performance detection. The device comprises a first cavity and a second cavity which are sealed cavities, a sound excitation source and two pickup sensors, wherein the first cavity is communicated with the second cavity through a narrow channel; the sounding surface of the sound excitation source is positioned in the first cavity; the two pickup sensors are respectively arranged in the first cavity and the second cavity and are respectively used for detecting sound pressures in the first cavity and the second cavity; materials for encircling the first cavity and the second cavity are sound isolation materials. According to device and the method, the technical problem that the sound absorption material is difficultly selected in the prior art is solved; performance test on the sound absorption material is realized; a technical index is provided for the selection of the sound absorption material; the production cost of an acoustic product is reduced, and higher economic benefits are created for the enterprise.

Description

technical field [0001] The invention relates to the technical field of material performance testing, in particular to a testing device and testing method for the impedance characteristics and expansion performance of sound-absorbing materials. Background technique [0002] The sound-absorbing material is a material that has a strong ability to absorb sound energy and reduce noise. The sound-absorbing material is placed in a cavity. When the cavity is filled with sound pressure, the sound-absorbing material will absorb part of the sound energy, which is equivalent to expanding the capacity of the cavity. Because the sound-absorbing material has such expansion characteristics, the technicians in the field of acoustics put the sound-absorbing material into the cavity of some acoustic products to expand the capacity of the product cavity without increasing the external volume of the product, so as to Improve the performance of acoustic products. [0003] There are many types o...

AI Technical Summary

Problems solved by technology

However, there is currently no device and method for testing the impedance characteristics and expansion performance of sound-absorbing materials. Technicians can only install each sound-absorbing material into the acoustic product in turn, and then test whether the performance of the acoustic product has changed, so as to judge Which sound-absorbing material is most suitable for this acoustic product

This kind of testing method for sound-absorbing materials is quite backward, causing a lot of waste of manpower and material resources to the enterprise, and prolonging the product development cycle, thereby increasing the production cost of the product

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