As having increased engine power, torsional and bending vibrations have become the point at issue. In the design of combustion engine, it is important to predict precisely the dynamic behavior of crankshaft for control of noise, vibration and reduction of engine weight.
In this paper, the modelling techniques about dynamic analysis of a crankshaft is used by transfer matrix method (using Finite element method).
First, a crankshaft is divided into some straight parts and some arm parts. In order to get transfer matrix of these substructure. Analytic solution is used for the former parts, and Finite element method is used for the latter ones, and the transfer matrix is obtained in both parts. Therefore, transfer matrix in crank throw is composed. With this transfer matrix and coordinate transformation matrix, total transfer matrix is obtained.
Next, from this transfer matrix and Boundary condition, the dynamic behavior of crankshaft is known.
