杨 溶，左承基   

    摘要：本文通过实验获得原消声器的插入损失数据，分析了消声器消声后的声音频谱特征，识别出未被消声器抑制的噪声源频段。利用建模软件和网格划分软件，分别建立了该消声器的三维模型和有限元模型，通过声学分析软件对消声器的声结构进行了声场分析，获得了该消声器的消声频谱特征。基于实验和数据分析结果，根据抗性消声理论改进了该消声器的结构参数及布置形式，设计出一种新型抗性消声器。仿真结果表明：新结构消声器的主要性能明显优于与原结构消声器，满足总噪声小于90dB的工程要求。

    关键词：消声器；抗性消声；声场分析；模型

    Abstract: According to the noise loss of the original muffler obtained by the experimental research, this paper analyzed the noise frequency character through the muffler and identified the noise band which has not been restrained by the muffler. The three-dimensional and finite element model of the muffler was built respectively by the modeling software and the mesh dividing software. The analysis for the acoustic field of muffler was carried out using the acoustic analysis software and the noise frequency character of the muffler was obtained meanwhile. On the basis of experimental and numerical investment, the structural parameters and the arrangement form of the muffler were improved according to the Resistance Muffler theory. A novel type of resistance muffler was designed. The simulation result indicates that the main performance of the new one was superior to the original one and that it meets the project requirements that the total noise is less than 90dB.

     Key words: Muffler; The Resistance Muffler; Analysis of Acoustic Field; Model