Analysis of the Worst Mistuning Patterns in Bladed Disk Assemblies

[+] Author and Article Information
E. P. Petrov, D. J. Ewins

Imperial College of Science, Technology & Medicine, Center of Vibration Engineering, Mechanical Engineering Department, Exhibition Road, London SW7 2BX, UK

J. Turbomach 125(4), 623-631 (Dec 01, 2003) (9 pages) doi:10.1115/1.1622710 History: Received December 01, 2000; Revised March 01, 2001; Online December 01, 2003
Copyright © 2003 by ASME
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Dependence the envelope of maximum response M on mistuning parameter variation for two blades of the assembly
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Finite element model and active nodes: (a) a bladed disk; (b) a sector of the bladed disk
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Correspondence calculated between the mistuning coefficient and frequency mistuning
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Natural frequencies of a tuned bladed fan disk and the analyzed frequency range
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Forced response of each from 26 blades of the fan bladed disk: (a) the case of tuned blades; (b) the case of mistuned blades
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Increase of the maximum amplitude with the number of iteration for the optimization search starting from different initial configurations and for random search
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Comparison of initial and worst mistuning patterns (circles) and amplitude distributions (triangles) for two of the optimization searches
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Initial and found worst mistuning patterns, (a); maximum amplitude distributions corresponding to these patterns, (b); sensitivity coefficients, (c); an envelope of maximum amplitudes calculated for the patterns, (d).
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A quarter of the high-pressure turbine bladed disk analyzed (a); and the active nodes chosen (b)
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Natural frequencies of a tuned bladed high-pressure turbine disk and the analyzed frequency range
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Increase of the maximum amplitude with the number of iteration for the optimization and random search
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Comparison of amplitude distributions (a); mistuning patterns (b); and sensitivity coefficients for initial and the found worst mistuning pattern (c)
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Comparison of results obtained with different numbers of active nodes: (a) increase of the maximum amplitude with the number of iteration; (b) worst amplitude distribution; (c) worst mistuning pattern



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