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RESEARCH PAPERS

Blade Vibration With Nonlinear Tip Constraint: Model Development

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

Westinghouse Electric Corporation, Science and Technology Center, Pittsburgh, PA 15235

J. H. Griffin

Department of Mechanical Engineering, Carnegie-Mellon University, Pittsburgh, PA 15213-3890

J. Turbomach 112(4), 778-785 (Oct 01, 1990) (8 pages) doi:10.1115/1.2927721 History: Received February 14, 1989; Online June 09, 2008

Abstract

Turbine blades having integrally machined tip shrouds, with associated gaps between adjacent shrouds, often exhibit unusual vibratory responses with significant differences between the amplitudes and frequencies of individual blades on the same stage. These differences result from unavoidable variations in the shroud gaps causing, for large enough excitation, nonlinear constraint at the blade tips which varies from blade to blade. This study shows that the blade stresses cannot be adequately represented by the type of single-degree-of-freedom models that are often used for dynamic impact studies, but require the participation of higher frequency beam-type modes. The extension of the resulting beam model to multi-degree-of-freedom systems will allow the study of the “gap mistuning” phenomenon for practical bladed disks.

Copyright © 1990 by The American Society of Mechanical Engineers
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