Dynamic Characteristics of Rotor System with a Slant Crack Based on Fractional Damping

作     者：Zhinong Li Yunlong Li Dong Wang Zhike Peng Haifeng Wang Zhinong Li;Yunlong Li;Dong Wang;Zhike Peng;Haifeng Wang

作者机构：Key Laboratory of Nondestructive TestingMinistry of EducationNanchang Hangkong UniversityNanchang 330063China Laboratory of Science and Technology on Integrated Logistics SupportNational University of Defense TechnologyChangsha 410073China State Key Laboratory of Mechanical Systems and VibrationShanghai Jiaotong UniversityShanghai 200240China 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2021年第34卷第2期

页      面：79-96页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 

基　　金：supported by National Natural Science Foundation of China(Grant Nos.51675258,51261024,51265039) State Key Laboratory of Mechani-cal System and Vibration(Grant No.MSV201914) Laboratory of Science and Technology on Integrated Logistics Support,National University of Defense Technology(Grant No.6142003190210) 

主　　题：Fractional calculus Slant crack Rotor system Dynamic characteristics 

摘      要：The traditional modeling method of rotor system with a slant crack considers only integer-order ***,the model of rotor system based on integer-order calculus can merely describe local characteristics,not historical dependent *** occur of fractional order calculus just makes up for the deficiency in integer-order ***,a new dynamic model with a slant crack based on fractional damping is ***,the stiffness of rotor system with a slant crack is solved by zero stress intensity factor *** proposed model is simulated by Runge-Kutta method and continued fraction Euler *** influence of the fractional order,rotating speed,and crack depth on the dynamic characteristics of rotor system is *** simulation results show that the amplitude of torsional excitation frequency increases significantly with the increase of the fractional *** the increase of the rotating speed,the amplitude of first harmonic component becomes gradually larger,the amplitude of the second harmonic becomes smaller,while the amplitude of the other frequency components is almost *** shaft orbit changes gradually from an internal 8-type shape to an ellipse-type shape without *** the increase of the slant crack depth,the amplitude of the transverse response frequency in the rotor system with a slant crack increases,and the amplitude in the second harmonic component also increases *** addition,the torsional excitation frequency and other coupling frequency components also *** proposed model is further verified by the *** valuable conclusion can provide an important guideline for the fault diagnosis of rotor system with a slant crack.