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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

A Reduced Order Approach for the Vibration of Mistuned Bladed Disk Assemblies

[+] Author and Article Information
M.-T. Yang, J. H. Griffin

Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA

J. Eng. Gas Turbines Power 119(1), 161-167 (Jan 01, 1997) (7 pages) doi:10.1115/1.2815542 History: Received March 31, 1995; Online November 19, 2007

Abstract

A reduced order approach is introduced in this paper that can be used to predict the steady-state response of mistuned bladed disks. This approach takes results directly from a finite element analysis of a tuned system and, based on the assumption of rigid blade base motion, constructs a computationally efficient mistuned model with a reduced number of degrees of freedom. Based on a comparison of results predicted by different approaches, it is concluded that: The reduced order model displays structural fidelity comparable to that of a finite element model of the entire bladed disk system with significantly improved computational efficiency; and under certain circumstances both the finite element model and the reduced order model predict quite different response from simple spring-mass models.

Copyright © 1997 by The American Society of Mechanical Engineers
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