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Technical Briefs

A Numerical Study on Ground-Based Vibration Response of a Spinning Cyclic Symmetric Rotor With Cracks

[+] Author and Article Information
Hyunchul Kim

Department of Mechanical Engineering,  University of Washington, Box 352600, Seattle, WA 98195

I. Y. Shen1

Department of Mechanical Engineering,  University of Washington, Box 352600, Seattle, WA 98195ishen@u.washington.edu

1

Corresponding author.

J. Vib. Acoust 133(6), 064504 (Nov 28, 2011) (7 pages) doi:10.1115/1.4005016 History: Received March 31, 2010; Revised July 16, 2011; Published November 28, 2011; Online November 28, 2011

This paper is to study how presence of cracks affects ground-based vibration response of a spinning cyclic symmetric rotor via a numerical simulation. A reference system used in this study is a spinning disk with four pairs of brackets, representing a fourfold cyclic symmetric rotor. A crack with a variable depth is introduced at one of the eight disk-bracket interfaces. Both radial and circumferential cracks are simulated. The ground-based vibration response of the spinning disk-bracket system is simulated using an algorithm introduced by Shen and Kim published in 2006. Compared with a perfectly cyclic symmetric rotor, the crack introduces additional resonances when the crack size is large enough. Frequencies of these additional resonances can be predicted accurately and may be used as a way to detect presence of cracks.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Mode shape of disk-bracket rotor with no cracks: low-frequency modes

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Figure 2

Mode shape of disk-bracket rotor with no cracks: high-frequency modes

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Figure 3

FEA model with a radial crack

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Figure 4

Mode shapes of the rotor with a radial crack

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Figure 5

Evolution of FRF for rotor with a radial crack: (0,4)L and (0,4)H modes

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Figure 6

Evolution of FRF for rotor with a radial crack: (0,0) mode

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Figure 7

Evolution of FRF for rotor with a radial crack: (0,2)H mode

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Figure 8

Evolution of FRF for rotor with a radial crack: 10th and 11th modes

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Figure 9

Evolution of FRF for rotor with a radial crack: (0,1) repeated modes

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