Simulative Analysis of Structure Vibration of Diesel Engine Based on Finite Element Method

The simulated prediction of the structural vibration of diesel engine has been made in this paper. The displacement maps on different frequencies were obtained by using finite element model. The FFT (Fast Fourier Transform Algorithm) was used to the displacement data of the parts where the vibration is strong. So, the displacement spectrum was obtained on those points. The study shows that response displacements between 60~500Hz are bigger than others. This is due to the rigid displacement of the diesel engine. There are some other big response displacements around 800Hz, 1400Hz and 1800Hz.This is the result of local vibration of the oil pan, flywheel shell and gear room cover. Improve the three parts structure can effectively reduce vibration of the diesel engine.