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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading: Part 1—Stick-Slip Contact Kinematics

[+] 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 120(2), 410-417 (Apr 01, 1998) (8 pages) doi:10.1115/1.2818138 History: Received July 01, 1997; Online November 19, 2007

Abstract

Friction dampers are often used in turbine design to attenuate blade vibration to acceptable levels so as to prolong blades’ service life. A wedge damper, also called a self-centering, blade-to-blade damper, can provide more design flexibility to meet various needs in different operating conditions when compared with conventional platform dampers. However, direct coupling of the two inclined friction interfaces of the wedge damper often leads to very complex contact kinematics. In Part I of this two-part paper, a dual-interface friction force model is proposed to investigate the coupling contact kinematics. The key issue of the model formulation is to derive analytical criteria for the stick-slip transitions that can be used to precisely simulate the complex stick-slip motion and, thus, the induced friction force as well. When considering cyclic loading, the induced periodic friction forces can be obtained to determine the effective stiffness and damping of the interfaces over a cycle of motion. In Part II of this paper, the estimated stiffness and damping are then incorporated with the harmonic balance method to predict the forced response of a blade constrained by wedge dampers.

Copyright © 1998 by The American Society of Mechanical Engineers
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