Sound-absorbing material impedance characteristics and capacity expansion performance test device and test method

Abstract

The invention discloses a sound-absorbing material impedance characteristic and expansion performance testing device and testing method, relating to the technical field of material performance testing, including: a first cavity and a second cavity both of which are sealed cavities, the first cavity The body and the second cavity are communicated through a slit channel; the acoustic excitation source, the sound emitting surface of the acoustic excitation source is located in the first cavity; two pickup sensors, the two pickup sensors are respectively arranged In the first cavity and the second cavity, respectively used to detect the sound pressure in the first cavity and the second cavity; enclosing the first cavity and the second cavity The materials of the body are all soundproof materials. The invention solves the technical problem of difficult selection of sound-absorbing materials in the prior art. The invention realizes the performance test of sound-absorbing materials, provides technical indicators for the selection of sound-absorbing materials, reduces the production cost of acoustic products, and creates greater economic benefits.

Description

Technical field [0001] The invention relates to the technical field of material performance detection, in particular to a test device and a test method for the impedance characteristic and capacity expansion performance of a sound-absorbing material. Background technique [0002] Sound-absorbing materials are materials that have strong ability to absorb sound energy and reduce noise. The sound-absorbing material is placed in a cavity. When the cavity is full of sound pressure, the sound-absorbing material will absorb part of the sound energy, which is equivalent to expanding the capacity of the cavity. Due to the expansion characteristics of sound-absorbing materials, those skilled in the field of acoustics place the sound-absorbing materials in the cavity of some acoustic products to expand the volume of the product cavity without increasing the external volume of the product. Improve the performance of acoustic products. [0003] There are many types of materials that can absor...

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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