Dynamic modeling and cavitation tendency analysis of cylinder liner considering the effects of moving loads

Based on a V type highly intensified diesel engine, research on cylinder liner dynamic characteristic modeling, analysis and evaluation technology taking into the effects of moving loads were conducted. A flexible multi-body dynamics model of the engine was built and more accurate changing curve of the side thrust force on the cylinder liner was obtained. With the moving loads theory and finite element method, the three-dimensional dynamic characteristics of the cylinder liner under the effect of moving loads were calculated. Based on the research above, the correlation between the acceleration response of cylinder liner outside surface and cavitation tendency was studied to provide the guidance to the structural design of cylinder liner. The results demonstrate that this method can get more accurate results in the calculation of the moving loads on cylinder liner. The vibration acceleration amplitude on cylinder liner outside surface is more suitable to evaluate the cylinder cavitation tendency. Increasing the thickness of cylinder liner can decrease the amplitude of cylinder liner vibration acceleration and the cavitation tendency. This provides the reference for the dynamic design of cylinder liner of the highly intensified diesel engine.