The Development Of Field Absorption Coefficient Testing System

Sound absorption coefficient of sound absorption and noise reduction material performance evaluation as an important parameter. It was widely used in various fields of auditorium acoustics and noise control engineering. At present, the testing method of material absorption coefficient mainly has the standing wave tube method and reverberation chamber method, the two kinds of methods are most mature and most widely used..However, these two methods belong to the laboratory method, because of the requirements of the testing conditions are too harsh, not suitable for field measurement. In this background, it is of great significance for the development and development of the field measurement system of the absorption coefficient.This thesis using pulse echo method theoretical basis for sound absorption coefficient test, absorption coefficient testing system developed on the existing sound absorption coefficient measurement standard method and domestic and foreign absorption coefficient measurement theory and method of research. The main work of this thesis is as follows:(1)Through the sound absorption coefficient field test theory in-depth study to determine the binding time window technique of impulse response method as sound absorption coefficient field test system development development theory method.(2) The software of the field test system of the sound absorption coefficient is developed by using G language in LabView.(3) With the development of hardware platform,the sound absorption coefficient field testing system realized in the process of sound absorption coefficient field test of the signal collection, signal analysis and processing, test results calculation and display, data storage and other functions.(4) Using the sound absorption coefficient field test system, the actual test sample is measured and the test results are analyzed.