基于有限元的转子动力学建模仿真与不平衡响应分析

Dynamic simulation and unbalance response analysis of the rotor based on finite element method

为了快速确定转子试验器不平衡测点位置,完成转子系统动平衡,借助有限元分析软件建立了地面转子试验器动力学仿真模型,可用于分析转子系统的不平衡响应特性,进而分析出各转速区间内转子各截面不平衡载荷的分布规律。仿真结果表明在一阶临界转速附近,转子前端的不平衡响应较大,在二阶临界转速附近转子后端的不平衡响应较大。最终,动平衡试验结果表明在一阶临界转速内转子前轴承截面对风扇盘不平衡量的变化较为敏感,而后轴承截面无法有效地反映出不平衡量的变化,证明了所采用的转子动力学仿真分析方法的有效性。

In order to rapidly determine the unbalance point of the rotor tester,and to reach dynamic balance of the rotor system,we established the dynamic simulation model of the rotor tester by using finite element analysis software,applied it to analyzing the unbalance response characteristics of the rotor system,and further obtained the distribution rules of the unbalance load of each section of the rotor in each speed range.The simulation results showed that around the first-order critical speed,the unbalance response at the front end of the rotor was bigger;around the second-order critical speed,the unbalance response at the rear end of the rotor was bigger.Dynamic balance test results showed that within the range of the first-order critical speed,the front bearing section of the rotor was most sensitive to the unbalance change of the fan,while the rear bearing section could not reflect the unbalance change.The results have proved the efficiency of the rotor dynamic simulation method.