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RESEARCH PAPERS: Gas Turbines: Combustion and Fuels

Forced Harmonic Response of Grouped Blade Systems: Part II—Application

[+] Author and Article Information
L. F. Wagner

Power Generation Technology Division, Westinghouse Electric Corporation, Pittsburgh, PA 15213

J. H. Griffin

Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213

J. Eng. Gas Turbines Power 118(1), 137-145 (Jan 01, 1996) (9 pages) doi:10.1115/1.2816529 History: Received February 15, 1994; Online November 19, 2007

Abstract

The vibration of grouped blades on a flexible disk should, for purposes of economy and clarity of modal identification, be analyzed using procedures developed for cyclically symmetric structures. In this paper, a numerical model, based on the theory of cyclically symmetric structures, is applied to the vibration analysis, and in particular, the harmonic response, of a flexible disk supporting a number of groups, or packets, of turbine blades. Results are presented to show variations in the modal participation factors as a function of such parameters as disk flexibility, blade density, and the total number of assembled groups. It is also shown that many characteristics of the system spectra of natural frequencies are strongly dependent on the number of blade groups.

Copyright © 1996 by The American Society of Mechanical Engineers
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