改变195柴油机的转矩、转速及供油时刻，测量分析各工况的缸盖振动加速度信号，分析结果表明，同样转速时，缸盖振动加速度时域最大波动量及2kHz以下各频带能量与缸内燃烧状况相对应；当转速发生改变时，加速度信号时域最大波动量及各频带能量与缸内燃烧状况间无对应关系。建立有限元分析模型，研究缸盖联接螺栓预紧力及材料刚度对缸盖振动加速度信号的影响规律，结果表明当材料的杨氏模量或联接螺栓预紧力减小时，系统的固有频率降低，使得缸盖振动加速度信号时域最大波动量及2kHz以下各频带能量呈增大的趋势。

Cylinder head vibration acceleration signals are measured from a 195 type diesel engine by changing torque, speed and injection timing. The signals are analyzed and results show that amplitude of maximum fluctuation and frequency components under 2kHz of acceleration are related with combustion status in the same speed, while both the amplitude of maximum fluctuation and frequency components under 2kHz of acceleration have no corresponding relation with combustion status in different speed. The influence of pretightening forces and material stiffness is studied using a finite element modal of the engine. Results show that the oscillation frequency of the engine will reduce along with decrease of stiffness and pretightening forces, this will increase the amplitude of maximum fluctuation and frequency components under 2kHz of vibration acceleration.