Comprehensive test instrument for performance of acoustic material

Abstract

The invention relates to acoustical material performance synthesis tester. It includes computer, double-microphone standing wave tube, four-microphone standing wave tube, and four-microphone sets. The double-microphone standing wave tube is made up of front and back standing wave tubes, loudspeaker, two microphone clams, piston rod lid support, piston rod, piston, and handle nut. The four-microphone standing wave tube is made up of front and back standing wave tubes, front and back end cover, loudspeaker, and microphone clam. The audio frequency output of the computer is connected with the loudspeaker. And the four-microphone sets are respectively connected with the signal input of the computer.

Description

technical field [0001] The invention particularly relates to an acoustic material performance comprehensive tester. Background technique [0002] With the development of society, the problem of noise pollution has become more and more prominent. In order to protect the environment and strengthen the control of noise pollution, acoustic materials have been widely used. According to their characteristics, these acoustic materials can be roughly divided into: sound-absorbing materials, sound-insulating materials and vibration-isolating materials. Vibration-isolating materials achieve sound insulation by reducing vibration. The most common acoustic materials are glass wool, foam, felt, glass, and rubber. etc. Obviously, vigorously promoting and using high-performance acoustic materials is of great significance to improving the noise environment and improving the quality of human life, and the development and production of high-performance acoustic materials is firstly based on ...

AI Technical Summary

Problems solved by technology

In terms of the theory of acoustic material performance testing, some international scholars have successively proposed a series of methods such as direct method, dual-microphone method, transfer matrix method, standing wave separation method, double-resistance method, and dual-carrier method. Each has its own strengths, but its accuracy depends on some specific assumptions, and it is difficult to directly apply it to the test instrument. In-depth research on the feasibility of this method

So far, there are only a few such test instruments in the world, but most of them adopt a three-microphone standing wave separation dynamic test structure similar to B&K's standing wave acoustic resistance tube (the split pipes move relatively, and one of the microphones is dedicated It is used for system calibration), which has the disadvantages of complex structure, large volume, narrow test range, high price, etc., and it is difficult to be widely promoted.

For a long time, due to the lack of direct testing methods and unified testing standards, the testing of material acoustic resistance characteristics has mostly been done indirectly by using some alternative equipment, resulting in low testing efficiency, large errors, complicated data processing, and difficult selection.

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