瞬态传递矩阵法分析热弯转子系统的热碰摩故障

为了揭示热弯转子系统的瞬态热碰摩动力特性,采用Riccati传递矩阵和Wilson-θ法相结合的方法,建立了瞬态传递矩阵法的非稳态热碰摩动力学方程.对多盘转子热启动过程中的非稳态热碰摩进行了数值计算与分析,模拟了稳态温度场下热弯转子的点碰摩与偏摩故障,发现了在不同动、静件间隙下由于不平衡力作用和热弯曲引起的非稳态热碰摩的一些动力特性.为避免和克服这种危险工况,改进转子系统运动稳定性提供理论与计算依据.

Transient Transfer Matrix Method for Thermal Rub-Impact Faults in Hot Bending Rotor System

In order to reveal the dynamical characteristics of transient thermal rub impact in a hot bending rotor system, the transient transfer matrix method was used to develop the dynamical equations of unsteady thermal rub impact through combining Riccati transfer matrix method with Wilson-θ method. The unsteady thermal rub impact was numerically computed and analyzed in the warm starting process of a multi-disk rotor, and the point rub impact and one-side wear-out faults of the hot bending rotor were simulated in steady-state temperature field. Some dynamical characteristics of unsteady thermal rub impact owing to the imbalance force and hot bending were therefore found. As a result, a theoretic and computational foundation is laid down for improving the stability of the rotor system to avoid or overcome such dangerous condition.