阻抗复合吸声结构的理论与声学特性研究

研究了由穿孔板、吸声材料及空腔构成的阻抗复合吸声结构理论，建立了其吸声性能预测模型，在实验验证理论正确性的基础上，分析了吸声结构参数与吸声性能的关系，从而为噪声控制中吸声结构的优化设计提供了依据

A Study of the Acoustical Properties of Compound Impedance in Sound Absorbing Structure

Based on the acoustic theory, a formula to calculate the specific acoustic impedance of sound absorbing structure composed by a perforated board and the porous fibrous absorbing materials is deduced, and a model predicting the characteristics of the compound impedance structure is established. The influence is analyzed which the structure parameters and physics parameters imposed on the absorption characteristics. Measurements of the absorption coefficient of the compound structure are used to evaluate the accuracy of the model. A law is developed to conclude the influence of various parameters exerted on the absorption performances of the compound structure. This model has been developed a predictive method and a tool to solve various problems in noise control engineering, and its accuracy and flexibility has been confirmed to be of practical use.