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以四缸内燃机为例 ,在建立三维装配实体的基础上 ,采用有限元法对活塞 -轴系和机体进行了动特性分析。在建模中充分考虑了实际约束条件 ,并对关键部件的接触问题作了处理。计算采用系统级的动特性分析方法获得了曲轴轴系的扭转、弯曲、伸缩振动及其复合振动 ,计算结果表明油膜刚度、阻尼系数的增加会导致活塞 -轴系振动频率的增加。
Taking a four-cylinder internal combustion engine as an example, based on the establishment of three-dimensional assembly entity, the dynamic characteristics of the piston-shaft system and the body were analyzed by the finite element method. The actual constraints are fully considered in the modeling and the contact of the key components is dealt with. The torsional, flexural, telescopic vibration and composite vibration of the crankshaft are obtained by system-level dynamic characteristics analysis. The results show that the increase of the stiffness and damping coefficient will lead to the increase of vibration frequency of piston-shaft system.