正弦泵叶轮组件转子动力学计算与仿真分析

Rotor Dynamics Calculation and Simulation Analysis of Impeller Assembly on Sine Pump

目的为了深入研究正弦泵的技术性能,对其叶轮转子进行动力学建模与仿真计算。方法在结构设计和理论分析基础之上构建转子等效力学模型,利用BEAM188,MASS21及COMBI214单元开发有限元建模程序;通过模态参数计算和多载荷步转子动力学分析,确定了基于Campbell图的前3阶临界转速;在ADAMS/View环境下建立多刚体动力学仿真模型;将泵体压力场简化为主轴之上的等效力矩,并在考虑接触特性的条件下对叶轮组件进行动力学仿真分析。结果转子实际工作转速(600~800 r/min)远小于其1阶临界转速(29 824.36 r/min);叶轮与刮板之间存在较大接触碰撞力,且支撑轴承承受了更大的动态冲击载荷。结论叶轮组件具有良好的转子动力学特性,符合正弦泵结构原理和实际工况。

The work aims to intensively study the technical performance of sine pump and carry out dynamic modeling and simulation calculation on its impeller rotor. Equivalent mechanical model of the rotor was established based on structural design and theoretical analysis, and its finite element modeling program was developed with elements BEAM188, MASS21 and COMBI214. On the basis of modal parameter calculation and rotor dynamic analysis with multi-load step, the critical speeds of the rotor from the 1st order to the 3rd order based on Campbell chart were determined. A simulation model of rigid multibody dynamics was set up by ADAMS/View software. The pressure field in the pump was simplified into an equivalent moment on the spindle, and the dynamic simulation and analysis of the rotor assembly were carried out with the contact characteristics taken into consideration. The actual working speed(600-800 r/min) of the rotor was far less than its first-order critical speed(29 824.36 r/min). Besides, there was a large contact force between impeller and scraper, and the dynamic impact load on support bearing was larger than others. With good rotor dynamic characteristics, the impeller assembly can adapt to the structural principle and actual working conditions of the sine pump.