W型压缩机曲轴-滚动轴承系统动力学分析与优化设计

Dynamic Simulation and Optimum Design for the Crankshaft-Rolling-Bearing System of a W-Type Reciprocating Compressor

以某W型压缩机的曲轴-滚动轴承系统为研究对象,利用ADAMS动力学仿真软件,研究了额定工况作用下曲轴-滚动轴承系统动力学行为和动力学优化设计问题。根据滚动轴承受力与变形的非线性关系,以整个曲轴-滚动轴承系统为研究对象,在ADAMS中建立弹性曲轴-滚动轴承动力学仿真模型并求解,得到了额定工况下主轴承反力和曲轴轴颈中心径向振动响应。以此基础上,建立曲轴-滚动轴承系统动力学优化设计数学模型,该模型以2个主轴承曲轴轴颈中心径向振动响应振幅为目标函数,以压缩机气缸中心线夹角为设计变量。最后利用参数化建模技术建立ADAMS优化模型并进行设计研究,得到了设计变量与目标函数之间的关系和最优解。所得到的结论对压缩机动力学设计有指导意义。

Two problems about a crankshaft - rolling bearing system in a W-type reciprocating compressor, are studied by ADAMS, a special software for dynamical simulation. One is the dynamic pe^ormance of the system and the other is the dynamic optimization. The nonlinear formula between the applying load and the displacement of crankshaft journal center in the main rolling bearings is used to build the dynomical simulating model of the system in ADAMS and the crankshaft was treated as a flexible one. The dynamic response of the crankshaft journal center and dynamic reacting forces of the two rolling bearings are obtained on rated operating conditiorL The mathematical model for dynamic optimization is presented, and its objective function is weighted sum of the amplitude of the crankshaft journal center in the two bearings and the design variable is the angle of cylinder lines. The parametric simulating model is constructed in ADAMS to search the optimum solution. The relation between the design variable and objective value is disclosed through ＂design study＇, which is a function module in the design evaluation tools of ADAMS. Numerical results are available for the dynamic design of reciprocating compressor.