穿孔板吸声结构的吸声性能及其应用

对穿孔板吸声结构的声学特性进行了理论分析与计算。讨论了穿孔板吸声结构的共振吸声原理，基于对穿孔板吸声结构声阻抗的讨论，分析了穿孔率、空腔深度、板厚、孔径等参数对吸声性能的影响，为穿孔板吸声结构的工程应用提供了依据。针对某工程机械风冷系统噪声突出这一现象，专门为风冷系统设计了穿孔板吸声结构，大幅度降低了该机风冷系统的噪声，也使该机的驾驶环境噪声得到了有效控制。

Sound Absorptivity and Application of Perforated Panel Structure

Theoretical analysis and calculation on the acoustic properties of perforated panel absorber were described herein. The resonance absorbing principle of perforated panel absorber was discussed. Based on the discussion about the acoustic impedance of perforated panel absorber, the analysis was conducted about the effects of the parameters, such as perforation area ratio, the depth of the cavity, the thickness of perforated panel absorber and the perforation-aperture, on its absorption characteristics. Some useful conclusions are obtained which can be a good reference for the application of perforated panel absorber in noise control engineering. Aimed at the situation that the noise of wind -cooling system was very outstanding in the noise of an engineering machinery, perforated panel absorbers were designed separately at the wind inlet and outlet. Noise of the wind-cooling system has been reduced obviously, and the noise in the driver environment is controlled effectively.