中文摘要：

为了改善听小骨消声器的消声性能，并减轻质量，以消声器低频和宽频的平均传递损失作为优化目标，以消声器的结构参数（进出口管道宽度、封闭腔深度、封闭腔长度）作为优化变量，消声器的质量作为约束条件，对其结构参数进行优化．建立了听小骨消声器的有限元模型，采用中心组合试验设计获得样本点，利用响应面法构造二次多项式响应面模型，并检验了响应面模型的拟合精度．将响应面模型和NSGA-Ⅱ遗传算法相结合对消声器的结构参数进行了优化．优化后消声器低频和宽频的消声性能得到改善，质量减轻，表明了响应面法和遗传算法相结合的消声器结构参数优化方法的有效性．

英文摘要：

In order to improve the performance and reduce mass of an ossicular silencer, the average transmission losses （TL） in the low frequency range and the broadband were chosen as optimization goals, several structural parameters （width of the main duct,depth of the enclosed cavity, and length of the en- closed cavity） were chosen as optimization variables, and the mass of the silencer was taken as the con- strain condition. The finite element model was also established for the silencer, sample points were ob- tained by central composite design （CCD）, the quadratic polynomial model was constructed based on re- sponse surface methodology （RSM）, and the fitting accuracy was tested. Response surface methodology combined with genetic algorithm II （NSGA-Ⅱ） was applied to optimize the structural parameters of the si- lencer. The optimized ossicular silencer shows better performance and lighter weight. The optimization re- sults indicate that the structural parameters of the silencer are optimized by combining the response surface methodology with genetic algorithm.