A Reduced Order Modeling Technique for Mistuned Bladed Disks

[+] Author and Article Information
M. P. Castanier, C. Pierre

Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109-2125

G. Óttarsson

Mechanical Dynamics Inc. Ann Arbor, MI 48109

J. Vib. Acoust 119(3), 439-447 (Jul 01, 1997) (9 pages) doi:10.1115/1.2889743 History: Received December 01, 1995; Online February 26, 2008


The analysis of the response statistics of mistuned turbomachinery rotors requires an expensive Monte Carlo simulation approach. Simple lumped parameter models capture basic localization effects but do not represent well actual engineering structures without a difficult parameter identification. Current component mode analysis techniques generally require a minimum number of degrees of freedom which is too large for running Monte Carlo simulations at a reasonable cost. In the present work, an order reduction method is introduced which is capable of generating reasonably accurate, very low order models of tuned or mistuned bladed disks. This technique is based on component modes of vibration found from a finite element analysis of a single disk-blade sector. It is shown that the phenomenon of mode localization is well captured by the reduced order modeling technique.

Copyright © 1997 by The American Society of Mechanical Engineers
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