【摘要】 由联轴器联结的多跨转子—轴承系统 ,整个轴系的扭转振动临界转速较低 ,为避免在工作转速范围内 ,常需要计算和进行结构修改。本文基于结构动力修改 ,提供了修改的思路和方法。通过对叠片联轴器联结的结构进行分析 ,利用有限元方法建立系统的力学模型以及系统扭转振动微分方程。在此基础上 ,计算由叠片联轴器联结的多缸串联机组扭转振动临界转速 ,推导叠片联轴器的结构几何参数对于多缸串联机组扭转振动临界转速的灵敏度 ,计算出叠片联轴器的结构几何参数修改后多缸串联机组扭转振动临界转速 ,并且结合结构特征灵敏度分析对计算结果进行分析和讨论。更多还原

【Abstract】 The critical speeds of twisting vibration of multiple rotor bearing system connected by coupling are often low. Some critical speeds are close to the working speeds. So structure parameters are needed to modify. This paper provides a good idea and effective methods based on the theory of structural dynamic modification to solve the problem. The mechanical model of the system connected by diaphgram couplings and the system motional differential equations of twisting vibration is established by finite element method. Then the critical speed of the system is calculated. The sensitivity of couplings’ structural parameter to system’s critical speed is derived. The system’s critical speeds are computed after modifing the structural parameter of diaphgram couplings. By using the eigen sensitivity method, the results are discussed and conclusions are obtained.更多还原