Dynamic characteristics of a shrouded blade with impact and friction
作者机构：School of Mechanical Engineering and AutomationNortheastern UniversityShenyang 110819China Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of EducationNortheastern UniversityShenyang 110819China
出 版 物：《Frontiers of Mechanical Engineering》 (机械工程前沿（英文版）)
年 卷 期：2020年第15卷第2期
页 面：209-226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] 0801[工学-力学（可授工学、理学学位）]
基 金：This project was supported by the National Natural Science Foundation(Grant No.11772089) the Fundamental Research Funds for the Central Universities(Grant Nos.N170306004,N170308028,N180708009,and N180306005) the Program for the Innovative Talents of Higher Learning Institutions of Liaoning(Grant No.LR2017035) Liaoning Revitalization Talents Program(Grant No.XLYC1807008)
主 题：twisted shrouded blade dynamic analysis impact friction separate-stick-slip motion
摘 要：A simplified computational model of a twisted shrouded blade with impact and friction is *** this model,the shrouded blade is simulated by a flexible Timoshenko beam with a tip-mass,and the effects of centrifugal stiffening,spin softening,and Coriolis force are *** force is simulated using a linear spring model,and friction force is generated by a tangential spring model under sticking state and a Coulomb friction model under sliding *** proposed model is validated by a finite element ***,the effects of initial gap and normal preload,coefficient of friction,and contact stiffness ratio(the ratio of tangential contact stiffness to normal contact stiffness)on system vibration responses are *** show that resonant peaks become inconspicuous and impact plays a dominant role when initial gaps are large between adjacent *** contrast,in small initial gaps or initial normal preloads condition,resonant speed increases sharply,and the optimal initial normal preloads that can minimize resonant amplitude becomes *** of friction affects the optimal initial normal preload,but it does not affect vibration responses when the contact between shrouds is under full *** resonant amplitude decreases with the increase of contact stiffness ratio,but the optimal initial normal preload is unaffected.
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