Acoustic characteristic of microperforated panel in altering temperature

Based on the acoustic absorption theory of microperforated panel and by the means of the theoretical analysis and emulation, the paper focuses on the acoustic characteristic including acoustic impedance, frequency and acoustic absorption coefficient of microperforated panel working in the combustion chamber which has high temperature and great temperature gradient. Changing laws affected by temperature changing are analyzed, and the changing laws of the effect on sound absorption due to the temperature changing and their emulation results are obtained. The analysis indicates that when the temperature rises, the relative acoustic resistance increases, the relative acoustic mass diminishes, the resonance frequency increases, the bandwidth broadens, and the absorption coefficient can get a maximum 1 in some temperature, and it decreases if the temperature falls away.