【摘要】 研究迷宫密封对某一工程涡轮泵转子系统动力特性的影响,迷宫密封力采用Muszynska非线性力模型,应用有限元法建立转子系统的动力学方程,采取系统动力学方程中包含的高阶线性自由度和低阶的非线性自由度进行分块处理的方法,有效地缩短了求解时间。根据Floquet理论,判别系统的临界失稳转速,并由Floquet乘子来确定系统失稳后分岔方式。采用分块-Newmark法数值模拟了转子二涡轮盘的轴心轨迹。最后分析了涡轮泵转子二涡轮盘的质量偏心同相位和存在90度相位差时对转子系统运动特性的影响。更多还原

【Abstract】 The dynamic stability of an engineering labyrinth seal rotor system is investigated.Muszynska model is employed to describe the nonlinear force from the seals,and finite element method is adopted to evaluate the rotor system.The higher order nonlinear algebra equations are divided into lower order bulks to shorten the computational period greatly.The threshold speed can be found with Floquet theory and the unstable dynamic behaviors of the system are analyzed.The orbits of shaft are simulated via partitioned Newmark approach,and the effects of the two rotor disk unbalance on the dynamic characteristics of the rotor system are discussed in detail.更多还原