Abstract：A modal and forced vibration analysis of the exhaust system of a car is carried out by using of Finite element software and AVL-Excite. First, a free modal analysis on the exhaust system is carried out by using of Finite element software; a preliminary analysis of reasonableness of the drop zone layout of the exhaust system is carried out. Then the Finite element software is used to reduce degrees of freedom, to extract the mass matrix, stiffness matrix, the main node degree of freedom of information and mode information of the exhaust system, and integrate these into the internal combustion engine - the exhaust system multi-body dynamic model, carry out the forced vibration analysis of the exhaust system, the impaction of the elastic deformation and modal resonance on vibration is fully considered. Vibration at any point of the exhaust system and the vibration transmissibility on the length of exhaust pipe is obtained, and its vibration coupling characteristics is studied; then a strong basis for space direction and structural design of the exhaust system can be provide.
2011, Vol. 30 
