用形状记忆合金对转子振动进行变结构主动控制

运用现代控制理论中的最优控制方法，引入时变控制和输出反馈控制，研究利用形状记忆合金对转子振动进行变结构变动控制，特别是抑制转子振动的瞬态响应的方法，得出了最优控制力和控制电流的强度变化规律；通过分析形状记忆合金动作器的结构，探讨了变刚度支承对系统总体刚度的影响，指出了传统设计方法的不足之处，特别是由压杆稳定性不足引起的失稳现象，并提出了改进的方法和在设计中值得注意的问题。

STUDY ON VARIABLE STRUCTURE ACTIVE CONTROL OVER ROTOR VIBRATION WITH SMA

Using the optimization control method of the moderm control theories,the time-varying control and output-feedback control the authors study the variable structure active control over the rotor vibration with SMA,especially the method of restraining the transient response of the rotor vibration.They get the rule of the optimum control force and the optimum control electric current and discuss the influence of variable stiffness on the total system stiffness through analyzing the structure of SMA controller.They also indicate the shortcoming of the orthodox design method of a controller,especially the imbalance phenomenon caused by the lack of the rod stability,and propose a new method for improvement and items which ought to be paid attention to in the design stage.