转子-支承耦合结构的模型修正研究

在转子-支承耦合结构的动力学分析过程中,结构模态参数计算结果与实验测试结果往往存在较大差异。针对此问题,应用优化算法对结构动力学模型进行修正,使计算模型能更准确地反映结构特性。建立由梁单元、盘单元、弹性支承单元组成的结构动力学有限元模型;选择优化目标函数、设计参数,并对各参数进行灵敏度分析。应用粒子群算法对选取的设计参数进行优化,得到最优模型。利用转子-滚动轴承实验器进行验证,结果表明,方法能够有效地实现转子-支承耦合结构的动力学模型修正,修正后模型更接近实际结构。

Study on Model Updating of A Rotor-support Coupling Structure

For rotor-support coupling system ,the calculated structural modal parameters usually cannot be close to the modal test results very well .To solve this problem ,the particle swarm optimization method is used to update the rotor-support coupling dynamic system model .Firstly, the dynamic finite element method （ FEM） model is established including the beam element ,disc element and support element .Sec-ondly,the objective function is constructed ,the design parameters are selected and the sensitivity of each parameter is analyzed.Finally,the particle swarm optimization method is used to calculate the objective function,and the best model is obtained .A rotor-bearing tester is used to verify the method proposed in this paper ,and the results prove the validity of the method , the updated FEM simulation model can be more close to the practical structural characteristics .