Vibration Analysis Of An Automotive Silencer

Automotive silencer plays an important role in dynamic performance of the exhaust system. As silencer is located at the tail end of the exhaust system with minimum support, it is subjected to intense vibrations. These vibrations cause localized stresses in silencer. The vibrations and stresses are analyzed by finite element method. Modal analysis is performed to evaluate dynamic characteristics of the silencer. It is observed that natural frequencies are away from excitation frequency. Further, dynamic frequency response analysis is performed with 3G acceleration in all directions varying with frequency. It is noticed that the stresses are concentrated at a joint between inlet pipe and flange and these stresses are above the material yield stress limit in X and Y directions. Hence, in order to reduce the induced stresses, the structural modification in silencer is proposed and subsequent analysis is carried out. The obtained stresses are below the yield stress limit in X as well as Y direction. The FEM results are verified by experimental results