Estimation of the internal and external damping from the forward and backward spectrum of a rotor with a fatigue crack

作     者：Dipendra Kumar Roy Rajiv Tiwari 

作者机构：Department of Mechanical EngineeringIndian Institute of Technology GuwahatiAssam781039India Faculty of Mechanical EngineeringIndian Institute of Technology GuwahatiAssam781039India 

出 版 物：《Propulsion and Power Research》 (推进与动力（英文）)

年 卷 期：2020年第9卷第1期

页      面：62-74页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0827[工学-核科学与技术] 0802[工学-机械工程] 0703[理学-化学] 0825[工学-航空宇航科学与技术] 0801[工学-力学（可授工学、理学学位）] 0823[工学-交通运输工程] 080102[工学-固体力学] 

主　　题：Internal damping External damping Switching crack Unbalance Full spectrum 

摘      要：Both internal and external damping are concurrently present in a rotor ***,the internal damping that originates from various sources often leads to instability in the rotor system,and hence its accurate estimation is *** goal of the present paper is to distinctly estimate both external and internal damping in a Jeffcott rotor containing transverse *** modelling of the fatigue crack is based on the assumption of a switching crack,which additionally provides the internal damping due to rubbing on crack faces,which is hardly addressed in ***,the fatigue crack leads to the forward and backward whirls due to asymmetry in the *** the process of development of the identification procedure in the form of the regression equation for the estimation of internal damping,other important unknown rotor system parameters,like the external damping,unbalance and loss of stiffness of the shaft due to the crack,are also *** reduces the estimation error of the internal damping due to reduction in deviations of other model *** simulated responses are obtained from equations of motion of the rotor system in the form of a closed-form expression and by the Runge-Kutta integration *** full-spectrum response data(both magnitude and phase)are utilized during the testing of the proposed identification *** corrections have been incorporated in the *** noise is added in numerical responses during identification of parameters to check the robustness of the algorithm and found to be working satisfactorily.