考虑透射噪声的内燃机薄壁件声学预测方法  

Acoustic prediction method of engine thin-walled parts considering transmission noise

作　　者：郑康[1] 郝志勇[1] 毛杰[1] 王连生[1] 

机构地区：[1]浙江大学能源工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2013年第4期692-697,共6页Journal of Zhejiang University：Engineering Science

摘　　要：为了准确地预测内燃机薄壁件的声学性能,利用多体动力学方法获得某柴油机齿轮室罩的螺栓激励,通过有限元法计算得到该齿轮室罩的表面振动速度.结合声辐射效率计算该件的辐射声功率.通过研究该齿轮室罩装配状态下的隔声量后发现,在某几个频率下隔声量会迅速减小,透射量与混响声源的声压成正比且非线性关系.将实验测得的齿轮室罩声压作为边界条件,计算该齿轮室罩的透射噪声,将透射噪声和螺栓激励引起的表面辐射噪声耦合获得的总声功率更接近实际情况.The multi-body dynamic method was used to obtain excitations from joints of gear case in order to predict the acoustic performance of engine thin-walled parts. The vibration speed on surface of the gear case was calculated with finite element method （FEM） under the excitations. Acoustic power of the part was predicted based on the vibration speed and acoustic radiation efficiency. Research on the sound transmission loss under constrained condition shows its loss rapidly decreases on certain frequencies and the loss has direct ratio and nonlinear relations with acoustic pressure value of reverberation source. The transmission transmission power of the power predic noise was calculated using the acoustic pressure from sound intensity test of the engine. The noise results coupled with acoustic power excited through joints made up the total acoustic thin-walled part. Considering the effect of the transmission noise made the total acoustic tion more credible.

关 键 词：薄壁件 多体动力学 透射噪声 声功率 

分 类 号：U263.14[机械工程—车辆工程]