变支承磁悬浮转子超临界运行仿真研究

Simulation of magnetic bearings rotor's critical characteristics by active variable supports

针对工业中转子系统在跨越一阶临界转速时,振动幅度过大及失稳的问题,通过对转子系统平稳跨越一阶临界转速方法的归纳和研究,提出了一种基于主动控制下的磁悬浮轴承—转子系统变支承跨越一阶临界转速的方法。首先建立了主动控制下的变支承磁悬浮转子系统数学模型,并分析了两支承转子系统和三支承转子系统跨越一阶临界转速时的响应特性;然后利用ADAMS和Matlab联合仿真了主动控制下的变支承磁悬浮转子系统跨越一阶临界转速时的振动特性。仿真研究结果表明:变支承磁悬浮转子系统在超临界运行时具有良好的减振效果,与传统两支承转子系统相比,其最大振幅减小了52.6%。

Aiming at the excessive amplitude vibration and instability when rotor pass through the critical speed,and the method of the rotor system smoothly pass through the first critical speed were researched.Anew method of active variable support magnetic bearings rotor system for passing through the first critical speed was described in this paper.Firstly,the mathematical model of variable support magnetic bearings rotor system were established,and the response characteristics of the rotor supported by two and three magnetic bearings were analysed.Then,the simulation model was established by ADAMS,and the model co-simulation was accomplished by using ADAMS and Matlab.The results indicate that when pass through the first critical speed the damping effect of variable support magnetic suspension rotor system is obvious,and the response amplitude can be reduced by 52.3%comparing with the traditional two-bearing rotor system.