Identifying the main noise source of I.C.Engine is the important precondition of noise control. The vibration and noise radiation from engine is very complicated for there are too many internal excitations of engine, and the excitations are also time variable. The digital signal processing(DSP) technique have got great achievement in recent years. And the achievement of DSP offers great means in analyzing the vibration and noise signal of I.C.Engine.
The acceleration of 4102 diesel was tested....