车用柴油机机体振动信号采集与分析

Acquisition and Analysis of Vibration Signal of Vehicle Diesel Engine

车用柴油机工作时的激振力最终都汇集到柴油机的机体上,采用压电式加速度传感器对机体振动信号进行采集与分析,对柴油机在不同的进气门间隙、排气门间隙及喷油压力下的机体振动状态进行分析。采用小波分析法使得不太强的频率信号特征以显著的能量变化形式表现出来,可为柴油机不同工作状态的分析提供参考。

The exciting force of vehicle diesel engine is collected on the body of the diesel engine.This thesis uses the piezoelectric acceleration sensor to acquire the vibration signal of the diesel engine and analyses its vibration status under the different intake valve clearance,exhaust valve clearance and injection pressure.The wavelet analysis method is used to change the characteristics of the energy.The reference is given to analyzing the working condition of the diesel engine.