多缸柴油机机体试验模态研究  

Experimental model analysis of CZ480 engine body

作　　者：王忠[1] 王小哲[1] 袁银南[1] 李健康[1] 

机构地区：[1]江苏大学

出　　处：《农业工程学报》2003年第2期126-129,共4页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目 (50 2 760 2 6)

摘　　要：用试验模态分析方法确定了 CZ480柴油机机体各阶振动频率 ,运用动态分析软件对机体在各阶振动频率下的变形进行了计算。结果表明 :第一、四阶模态的振型以机体的扭转振动为主要特征 ;第二、三、五、六阶模态以机体弯曲、弯曲与扭转相结合振动为主要振型特征 ,这几阶振型对发动机的正常工作影响较大。振动频率较高时 ,在机体的上部 (即活塞在缸套内的运动位置处 )平面会产生沿机体轴向的振动 ,表现为椭圆振型特征。机体在该处的振动变形会导致气缸漏气、窜机油等现象 。Experimental model analysis was used to determine the different frequencies of the CZ480 diesel engine body and the deformation of the body was calculated by software STAR 5.0. The results show that there is a torsion formation of the engine body in the first and the fourth models, and there is also a bend torsion deformation in the second, third, fifth and sixth stage models. These deformations have sighificant effects on engine performance. There is also a vibration along the axes of the engine body, and the shape of the vibration is elliptical. This causes the leakage of gas and lubricating oil from cylinder. This is also the main reason that damage to the cylinder line and the engine body occurs. This provides a basis for analysis of the vibration of engine body by FIM model analysis. It also provides a theoretical basis for desigh improvement of the engine body.

关 键 词：机体 试验模态分析 频率 

分 类 号：TK427[动力工程及工程热物理—动力机械及工程]