缸套-活塞间隙与振动信号关联维数的关系评价

利用发动机气缸套振动信号特征评价气缸套-活塞组件磨损状态,建立了发动机气缸套、活塞、曲柄和连杆机构的动力学模型并进行了动力学仿真.然后又进行了气缸套表面振动分析,并对所得到的振动模拟信号进行了基于关联维数的信号特征评价.结果表明,随气缸套-活塞组件磨损间隙的增加,振动信号幅值增大,气缸套表面振动加速度信号的自相关程度变大,气缸套表面振动信号的关联维数有下降的趋势,这些关联性可以作为发动机气缸套-活塞组件磨损状态评价的特征量.

Evaluation of Correlation Dimensions of Engine Cylinder-Piston Clearance and Vibration Signal

In order to evaluate the wear status of cylinder liner-piston components by using engine cylinder liners’ vibration signal features， this study established a dynamic model of cylinder liner， piston， crank and connecting rod of the engine and carried out its dynamic simulation. Then the vibration analysis of the cylinder liner surfaces was conducted， and the correlation dimension-based signal features of the simulated vibration signals were evaluated. The analytical results showed that when the cylinder-piston wear clearance increases， the vibration signal amplitude increases， the self-correlation degree also increases， and the correlation dimension of the cylinder liner surfaces’ vibration signal decreases. These correlation dimensions can serve as feature indexes to evaluate the wear status of engine cylinder liner-piston components.