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Research Papers

Reduced-Order Model of a Bladed Rotor With Geometric Mistuning

[+] Author and Article Information
Alok Sinha

Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802

J. Turbomach 131(3), 031007 (Apr 08, 2009) (7 pages) doi:10.1115/1.2987237 History: Received July 22, 2007; Revised February 22, 2008; Published April 08, 2009

This paper deals with the development of an accurate reduced-order model of a bladed disk with geometric mistuning. The method is based on vibratory modes of various tuned systems and proper orthogonal decomposition of coordinate measurement machine data on blade geometries. Results for an academic rotor are presented to establish the validity of the technique.

FIGURES IN THIS ARTICLE
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Copyright © 2009 by American Society of Mechanical Engineers
Topics: Rotors , Disks , Blades
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References

Figures

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Figure 9

Steady state response to nine nodal diameter excitation (mistuning pattern No. 1)

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Figure 10

Comparison between frequencies from MMDA via sector and full rotor ANSYS analyses

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Figure 8

Comparison between frequencies from MMDA with r=120 and r=24

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Figure 7

Difference between modal vectors from MMDA and full rotor ANSYS analysis (mistuning pattern No. 2)

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Figure 6

A mistuned modal vector from MMDA (mistuning pattern No. 2)

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Figure 5

Mistuned natural frequencies from MMDA (mistuning pattern No. 2)

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Figure 4

Mistuned natural frequencies from MMDA (mistuning pattern No. 1)

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Figure 3

Blade thickness for each POD feature

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Figure 2

Discretization of a blade by finite elements

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Figure 1

An academic rotor with 24 blades

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