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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

A Reduced-Order Model for Evaluating the Effect of Rotational Speed on the Natural Frequencies and Mode Shapes of Blades

[+] Author and Article Information
P. Marugabandhu, J. H. Griffin

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

J. Eng. Gas Turbines Power 125(3), 772-776 (Aug 15, 2003) (5 pages) doi:10.1115/1.1448327 History: Received November 01, 1999; Revised February 01, 2000; Online August 15, 2003
Copyright © 2003 by ASME
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References

Yang,  M.-T., and Griffin,  J. H., 1997, “A Normalized Modal Eigenvalue Approach for Resolving Modal Interaction,” ASME J. Eng. Gas Turbines Power, 119, pp. 647–650.
Kim,  N., and Griffin,  J. H., 1994, “Sensitivity of Bonded and Composite Beams,” J. Sound Vib., 177, pp. 71–92.
Perkins,  N. C., and Mote,  C. D., 1985, “Comments on Curve Veering in Eigenvalue Problems,” J. Sound Vib., 106, pp. 451–463.
Pierre,  C., 1988, “Mode Localization and Eigenvalue Loci Veering Phenomena in Disordered Structures,” J. Sound Vib., 126, pp. 485–502.
Balmes,  E., 1992, “High Modal Density Curve Veering, Localization: A Different Perspective on the Structural Response,” J. Sound Vib., 161, pp. 358–363.
Nair,  P. S., and Durvasula,  S., 1972, “On Quasi-Degeneracies in Plate Vibration Problems,” Journal of Mechanical Science, 15 , pp. 987–992.
Kenyon, J., 1999, “Investigation of Curve Veering Using Computational and Experimental Techniques,” Proceedings of the 40th AIAA/ASME/ASCE/AHS Structures, Structural Dynamics and Materials Conference and Exhibit, AIAA, Apr., pp. 1550–1558.
Yang, M.-T., and Griffin, J. H., 1999, “A Reduced Order Model of Mistuning Using a Subset of Nominal System Modes,” ASME Paper No. 99-GT-288.

Figures

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Geometry of cantilevered tapered plate
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Frequencies of first five modes versus rotational speed
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Frequency veering and mode shape changes
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Comparison of frequencies
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Comparison of modal content

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