A Method Recognizing Parameters of a Cracked Rotor with Vibration Response

SHI Hong-hao;FENG Chang-shui;School of Mechanical Engineering/Hangzhou Dianzi University;

SHI Hong-hao%FENG Chang-shui%School of Mechanical Engineering/Hangzhou Dianzi University

Cracked rotor;;Runge-Kutta;;parameter identification;;genetic algorithm

Aiming at dynamic characteristics and parameter identification of a kind of cracked rotor, the stiffness model of the cracked rotor-neutral axis model was choosed to propose a numerical solution method for differential equations of cracked rotor under neutral axis model and study on the influence of parameters on dynamic characteristics of cracked rotor system. Then follow the inverse problem solution, the motion differential equation of cracked rotor was dismantled and iterated by using the Runge-Kutta method. The fitness function in genetic algorithm was obtained by using the average value method. Thus the transformation from the parameter identification problem of crack rotor to the optimal problem solving the minimization of the dynamic response difference value so as to realize the cracked rotor parameter identification problem solving the dynamic response to the most value optimization problem of minimizing the value difference. Finally, the genetic algorithm was used to solve the optimal problem and the example was used to verify the method. The relative error from parameter identification of the cracked rotor was realized below 0.6%.