磁悬浮挠性转子系统模型复合辨识方法

针对磁悬浮挠性转子的纯有限元分析模型精度低的问题,提出一种磁悬浮挠性转子系统模型复合辨识方法。该方法首先采用有限元方法把磁悬浮挠性转子划分为多个Timoshenko梁单元,建立磁悬浮挠性转子系统模型,并对其挠性临界频率、阻尼、刚度和振型等关键参数进行分析,进而得到磁悬浮挠性转子的等效降阶数学模型;然后采用鲁棒自适应方法分析磁悬浮挠性转子系统的动态特性;最后,采用变LEVY方法从动态特性分析数据中对磁悬浮挠性转子进行系统辨识,校正有限元分析得到的降阶数学模型。实验结果表明,本方法可以得到磁悬浮挠性转子较为准确的系统模型。

Compound identification method of magnetic flexible rotor model

Aiming at the problem of low accuracy of the pure finite element analysis model for the magnetic flexible rotor,a new compound identification method of magnetic flexible rotor model is proposed.First,a finite element method is used to divide the magnetic flexible rotor into a plurality of Timoshenko beam elements.Then,a magnetic flexible rotor system model is built,the key parameters of the flexible rotor such as critical frequency,damping,stiffness and vibration mode are analyzed,and then the equivalent reducedorder mathematical model is obtained.Based on this,the dynamic characteristics of the flexible rotor system are analyzed using a robust adaptive method.At last,a correction LEVY method is used to identify the magnetic flexible rotor system by analyzing the dynamic characteristics data of the rotor,and the equivalent reduced-order mathematical model obtained by the finite element method is calibrated.Experimental results show that this method can obtain a more accurate system model of the magnetic flexible rotor.