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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Modeling of Friction Contact and Its Application to the Design of Shroud Contact

[+] Author and Article Information
B.-D. Yang, C.-H. Menq

Department of Mechanical Engineering, The Ohio State University, Columbus, OH 43210

J. Eng. Gas Turbines Power 119(4), 958-963 (Oct 01, 1997) (6 pages) doi:10.1115/1.2817082 History: Received February 01, 1996; Online November 19, 2007

Abstract

Designers of aircraft engines frequently employ shrouds in turbine design. In this paper, a variable normal load friction force model is proposed to investigate the influence of shroudlike contact kinematics on the forced response of frictionally constrained turbine blades. Analytical criteria are formulated to predict the transitions between stick, slip, and separation of the interface so as to assess the induced friction forces. When considering cyclic loading, the induced friction forces are combined with the variable normal load so as to determine the effective stiffness and damping of the friction joint over a cycle of motion. The harmonic balance method is then used to impose the effective stiffness and damping of the friction joint on the linear structure. The solution procedure for the nonlinear response of a two-degree-of-freedom oscillator is demonstrated. As an application, this procedure is used to study the coupling effect of two constrained forces, friction force and variable normal load, on the optimization of the shroud contact design.

Copyright © 1997 by The American Society of Mechanical Engineers
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