【作者】 李自强； 季振林；

【Author】 Li Ziqiang;Ji Zhenlin;

【机构】 哈尔滨工程大学动力与能源工程学院；

【摘要】 消声器传递损失的计算往往局限于截止频率以下,难以考虑进出口管内高阶模态对消声器声学性能的影响。本文采用三维有限元法分析消声器内部声场,用声波分解法分离高阶模态波,用离散单元的入射声功率和透射声功率来评价传递损失,从而能考虑进出口管内高阶模态对消声器传递损失的影响。更多还原

【Abstract】 The calculation of transmission loss of silencer is usually restricted to the below of cut-off frequency and it is difficult to consider the impacts of the high order mode in inlet and outlet tubes on the acoustic performance of silencer.This thesis uses 3-D Finite Element Method to analyze the acoustic field inside the silencer and employes the wave decomposition method to separate the higher order modes.The incident sound power and transmited sound power through discrete elements on the inlet on outlet are used to evaluate the transmission loss,thereby,the effect of higher order modes in inlet tube and outlet tube on the transmission loss of silencer may be considered.更多还原