基于最优极点配置的混合轴承-转子系统振动控制

针对电液伺服控制的主动混合滑动轴承,研究了基于最优极点配置的转子振动控制方法和策略.根据扰动压力法求解非线性Reynolds方程及流量平衡方程得到轴承和伺服控制系统线性化的动态特性系数,用以建立系统线性状态空间模型;给出了极点配置和最优控制相结合的状态空间反馈控制策略,以克服多输入系统常规极点配置方法状态反馈不唯一的缺陷.计算结果表明,由于转子不平衡或同步激励引起的转子振动得到了有效抑制,在外部突发激励作用下,转子也具有优越的动态响应特性,验证了控制方法的有效性.

VIBRATION CONTROL OF AN ACTIVE HYBRID BEARING-ROTOR SYSTEM BASED ON OPTIMAL POLE ASSIGNMENT METHOD

The vibration control method and strategy of an active hybrid sliding bearing-rotor system incorporating an electro-hydraulic servo control system is studied. The control strategy is based on an optimal pole assignment method.The linearized dynamic coefficients associated with the bearing and the servo control system are obtained by solving the nonlinear Reynolds equation and the flow continuity equation.A linear stat-space feedback control model is then constructed using these dynamic coefficients.The control model combines the pole assignment and the optimal theory,thus the drawback of the conventional pole placement method for multi-input systems,that the state feedback control is not unique,will be overcome.Numerical results show that the proposed method can effectively reduce the vibration amplitude excited by mass imbalance or external synchronous forces,and the system also has a superior dynamic response characteristic when subjected to step excitation.