RESEARCH PAPERS: Gas Turbines: Structures & Dynamics

Mode Localization of a Cracked Blade Disk

[+] Author and Article Information
J. H. Kuang, B. W. Huang

Department of Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China

J. Eng. Gas Turbines Power 121(2), 335-341 (Apr 01, 1999) (7 pages) doi:10.1115/1.2817125 History: Received April 01, 1998; Online December 03, 2007


In this paper, the effect of blade crack on the mode localization of a rotating blade disk is studied. Pretwisted taper beams are used to simulate blades of a blade disk. The crack on the blade can be regarded as a local disorder of this periodically coupled blades system. An application of Hamilton’s principle and Galerkin’s method is used to formulate the equations of motion of the mistuned system. Effects of pretwisted angle, rotating speed, and crack depth of the blade on the in-plane and off-plane mode localizations of a rotating system are investigated. Numerical results indicate that the increase of rotating speed, pretwisted angle, and crack depth could enhance the localization phenomenon significantly.

Copyright © 1999 by The American Society of Mechanical Engineers
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