摘要
为了研究发动机整机结构的动力学特性,在各子结构——机体、曲轴、缸盖和曲轴箱正确的三维实体模型的基础上,组装成整机模型.采用实验研究和理论计算相结合的方法,对此整机的振动模态进行了研究.由于部件间结合面的刚度与阻尼特性难于理论分析和实验提取,采用了虚拟材料来模拟结合面特性,通过反复修正虚拟材料的特性常数,使得整机有限元振动模态分析结果与实验结果相吻合.从而说明所建立的整机的有限元模型是正确可靠的,为整机结构进一步的动态仿真研究奠定了基础.
For studying dynamic features of an engine, the engine model was first built based on the correct 3D solid models of four elements including a block, a crankshaft, a cylinder-head and a crankcase. The vibration modes of the engine have been researched by experiments method and finite element calculation. Virtual materials were introduced to simulate the stiffness and damping features of the joint surfaces between the four elements because those features were difficult to be obtained either theoretically or experimentally. Characteristic of the virtual materials were gradually modified until the finite element calculation result were consistent with the experimental ones. The work proves the validity of the finite element model of the engine and paves the way to further research of the engine＇s dynamic simulation.
出处
《测试技术学报》
2007年第5期382-385,共4页
Journal of Test and Measurement Technology
关键词
发动机
振动模态
有限元
模态分析
engine
vibration mode
finite element
mode analysis
