柴油机活塞和连杆运动的有限元分析

The Analysis with Finite Element Method to Piston-Linkage Mechanism of Diesel Engine

本课题基于运动弹性动力学理论以及有限元分析方法 ,利用美国SDRC公司的I DEAS软件 ,对含运动副间隙的XN2 110柴油机的活塞、连杆机构建立了动力学模型 ;运用KED分析中的“瞬时结构”假定 ,计算出了柴油机膨胀冲程 19个瞬时结构条件下的位移、应力、应变 ,求出了机构的动态响应 ,得到了用KED法求出的活塞弹性变形值 ,从而为柴油机实现精确控制提供了可靠的理论依据。

On the basis of modern theories of vibration,KED analysis and finite element method, a kinetic model of piston-linkage mechanism of XN2110 diesel engine was set up by I-DEAS software of SDRC USA. By the presumption of 'transient structure' in KED analysis, the mechanism's stress,displacement ,strain, modes ,frequency and the dynamic responses in nineteen transient structure conditions during the expanding stroke are calculated, and the difference of piston elastic deformation between KED or KES value are also gotten.