Sound absorption coefficient field measurement apparatus and method

Abstract

The invention relates to a sound absorption coefficient field measuring device. The device is characterized by comprising a measuring probe and a fixed handle. The measuring probe comprises a probe substrate, a microphone measuring probe and a material space measuring probe; one end and the middle part of the probe substrate are respectively provided with a chute, and a position measuring scale is arranged on the probe substrate between the two chutes; the other end of the probe substrate is articulated with the fixed handle; the microphone measuring probe comprises a microphone fixing tube which is arranged in a chute arranged at the upper part of the probe substrate in a sliding way by a guide block; a BNC joint is arranged at the front end of the microphone fixing tube, a microphone position staff is arranged at the rear end, a tip of the microphone position staff is coincident with the axis of a microphone and points at the position measuring scale; and the material space measuring probe is transversely arranged on the chute arranged at the middle part of the probe substrate in a sliding way by the guide block, and the center of the material space measuring probe is provided with a material space position staff which also points at the position measuring scale. The measuring device has the advantages of simple and compact structure, convenient use and low cost, and can be widely applied to sound absorption coefficient measurement of various sound absorption materials.

Description

technical field [0001] The invention relates to a sound absorption coefficient measuring device and method, in particular to a sound absorption coefficient on-site measuring device and method which can be used for on-site measurement of the sound absorption coefficient of a sound-absorbing material. Background technique [0002] At present, sound-absorbing materials are used more and more in the fields of industry and construction, and their sound absorption coefficient directly affects the effect of sound-absorbing materials, and fast and accurate measurement of the sound-absorbing coefficient of sound-absorbing materials is important for rational selection of materials and control of noise. has an important role. The commonly used measurement methods of sound absorption coefficient are the reverberation chamber method and the standing wave tube method, and the standing wave tube method is further divided into the standing wave ratio method and the transfer function method....

AI Technical Summary

Problems solved by technology

The reverberation chamber method measures the sound absorption coefficient of random incidence, but the construction cost of the reverberation chamber is quite expensive, which is not conducive to large-scale use

The standing wave tube method measures the sound absorption coefficient of vertical incidence and the surface normal acoustic impedance of the sound-absorbing material, but the standing wave tube can only measure small specimens, and the obtained sound absorption numbers often cannot match the application conditions , so how to measure the sound absorption coefficient of sound-absorbing materials on-site is an important issue to improve the level of noise control

Both French scholar J.F.Allard and Japanese scholar Y.Takahashi have conducted some research on the on-site measurement method of sound absorption coefficient (Journal of Noise Control Engineering, 32(1), 1989; Applied Acoustics Vol.66), but have not designed a special test device

At the same time, due to the influence of factors such as the experimental environment, experimental equipment, and frequency limitations, it is difficult to test sound-absorbing materials in actual working conditions.

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