质量慢变转子系统的碰摩分析

根据离心机转子质量慢变以及偏心量大的特点,对其在线性碰撞力和线性摩擦力作用下的碰摩动力学特性进行了理论研究,建立了相应的质量慢变碰摩运动微分方程,并应用数值方法分析了转子转速及不平衡量的变化对碰摩转子系统的振动特性的影响,分别从不同侧面描述和揭示了质量慢变转子系统的周期运动、拟周期运动,以及这些运动形式的转化与演变过程·结果表明质量慢变转子系统相当于一个具有时变阻尼和时变刚度的转子系统,该系统的显著特点是在碰摩过程中转子呈现为拟周期运动,并非像相应的恒定质量转子系统那样出现混沌运动·

Rub-Impact Analysis of Rotor System with Slow-Varying Mass

A differential equation is developed expressing the motion of a rotor system with slow-varying mass, based on a theoretical study on the rub-impact dynamic characteristics of a rotor system with slow-varying mass in a centrifuger with large eccentricity under the action of linear collisional/frictional forces. The effects of changes in rotor speed and unbalance on the vibration of a rubbed/impacted rotor system are analyzed through numerical method. Thus, the periodical and quasi-periodical motions of rotor system with slow-varying mass are revealed and described at different aspects, and how their forms evolved and transformed are discussed. The results indicate that the rotor system with slow-varying mass is equivalent to a rotor system with time-dependent damping and stiffness, which has obvious quasi-periodical motion features in its rubbed/impacted process without a chaotic motion arising from the constant mass of rotor system.