用记忆合金转子系统振动的变结构主动控制研究

In the item, variable structure active control to rotor vibration with SMA is studied. The material performance of SMA , especially the coupled relation of strain, stress and temperature, is studied in nonlinear coupled thermoelasticity theory. The bifurcation and chaos behavior of nonlinear rotor system with SMA bearing is studied in bifurcation and chaos theory . the effect of system parameter on dynamic behavior and the parameter region when chaos phenomenon is appeared are obtained. The concept of fuzzy control and time-varying control are introduced to variable structure active control to solve the transient response problem caused by parameter varying with time in variable stiffness control of rotor system. Finally, the vibration control effect of active control system is proved by emulation. The emulation results show that the vibration amplitude of improved system is only 40% of the original

利用记忆合金的超弹性特性和形状记忆功能及转子刚性的非线性对转子系统的振动进行变结构主动控制，可广泛应用于发动机、风机等各种旋转机械，不仅结构简单重量轻，利用对现有机械进行改造而且减振效果达４０％－－６０％。首次用非线性动力学分岔与混沌和时变控制理论研究转子振动的主动控制，并可设计出用记忆合金制作的变结构主动控制的可控支承