大型活塞压缩机曲轴扭振分析(二)——瞬态应力分析  

Torsional Vibration Analysis of the Crankshaft of Large Type Piston Compressor——Transient Stress Analysis(Ⅱ)

作　　者：詹科[1] 余宾宴[1] 余小玲[1] 冯全科[1] 

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《压缩机技术》2013年第4期21-23,42,共4页Compressor Technology

摘　　要：介绍了一种结合多体系统动力学和有限元分析对大型活塞压缩机曲轴进行瞬态应力计算的方法。该方法首先运用多体动力学方法对曲轴、连杆、活塞等运动部件的动力学过程进行仿真,得到作用在曲轴上的真实载荷,再将此载荷作为边界条件应用到曲轴的有限元模型中,最后求解得到曲轴的瞬时应力。与传统的扭振当量系统计算方法,以及单一的曲轴应力有限元分析方法相比,该方法考虑了往复质量的转动惯量随曲柄转角的变化,并能计算曲轴扭转、横向、轴向3个振动方向的综合应力,因而计算结果更为精确。A new method combined multi-body dynamics theory and finite element analysis was presented to calculate transient stress of the crankshaft of large type piston compressor.Firstly,a simulation on foundation of multi-body dynamics theory was done to get dynamic behaviors of the crankshaft, the connecting rod, the piston and so on, and thus to get the real loads acting on the crankshaft. Then these loads served as the boundary conditions were applied to the finite element model of the crankshaft.Finally,transient stress of the crankshaft is obtained by solving this finite element model.Comparing to traditional methods, such as the equivalent torsional vibration method and the only finite element method for the stress calculation, this new method not only considers the inertia of re- ciprocating mass varying with the crank angle, but also can calculate the integrated vibration stress of three directions including torsion,lateral and axial.Therefore, the results of the new method will be more precise.

关 键 词：曲轴 扭转振动 变惯量 多体动力学 大型往复式压缩机 

分 类 号：TH457[机械工程—机械制造及自动化]