Stick-Slip Motion of Frictionally Damped Turbine Airfoils: A Finite Element in Time (FET) Approach

[+] Author and Article Information
Yu Wang

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

J. Vib. Acoust 119(2), 236-242 (Apr 01, 1997) (7 pages) doi:10.1115/1.2889709 History: Received July 01, 1994; Revised June 01, 1995; Online February 26, 2008


A method is proposed for analyzing the periodic stick-slip motion of a single degree of freedom model of frictionally damped turbine blades. The method of finite elements in the time domain (FET) is based on a Hamilton’s weak principle, paralleling the variational methods in elastostatics. It permits a complete determination of the hysteretic friction force, and results in a set of highly structured system equations. The method has a number of unique features, which are utilized to provide a simple yet efficient approach for predicting the steady-state response. When applied to a number of example problems, including systems with static friction and the excitation of multiple discrete frequencies, the FET method is demonstrated to be an efficient and reliable alternative technique for nonlinear dynamic response analysis.

Copyright © 1997 by The American Society of Mechanical Engineers
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