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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

A Harmonic Wavelets Approach for Extracting Transient Patterns From Measured Rotor Vibration Data

[+] Author and Article Information
V. C. Chancey

Department of Biomedical Engineering, Duke University, Durham, NC 27708-0281

G. T. Flowers, C. L. Howard

Department of Mechanical Engineering, Auburn University, Auburn, AL 36849-5341

J. Eng. Gas Turbines Power 125(1), 81-89 (Dec 27, 2002) (9 pages) doi:10.1115/1.1520156 History: Received December 01, 2000; Revised March 01, 2001; Online December 27, 2002
Copyright © 2003 by ASME
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Figures

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(a) Absolute Fourier coefficients for x(t)=e−0.5t cos([10+2t]πt) over a 25-sec time interval; (b) absolute Fourier coefficients for x(t)=e−0.5t cos([10+2t]πt) over a 25-sec time interval shifted as described above; (c) absolute Fourier coefficients for x(t)=e−0.5t cos(10⋆2πt) over a 25-sec time interval
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AHWC for x(t)=e−0.5t cos([10+2t]2pt) calculated as described from the shifted spectrum (Fig. 1(b)) compared to AHWX from the unshifted spectrum (Fig. 1(a)) for an initial eight-second interval
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(a) Case 1 time response with d1=0.01,bs=1,c1s=30,ms=1,ks=4π2,cs=0.01,msω2u=0; (b) Case 1 time response superimposed with absolute harmonic wavelet coefficients in the transient response region
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(a) Case 2 time response with d2=0.005,ω=2π,ms=1,ks=4π2,cs=0.01,msω2u=1; (b) Case 2 time response superimposed with absolute harmonic wavelet coefficients in the transient response region
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(a) Photograph of experiment test rig; (b) experiment setup for oil whirl testing
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(a) Oil whirl vibration data, (b) the frequency spectrum during oil whirl of vibration at the journal bearing end and of the motor speed at 1448 rpm (magnified ×10) allows the correlation of supersynchronous vibrations present during oil whirl; (c) overlaid AHWC from levels associated with oil whirl and synchronous when compared to the time response reflect amplitude variation associated with changing conditions of the onset of oil whirl
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(a) Nonoctave AHWC for the second harmonic of oil whirl; (b) nonoctave AHWC for synchronous vibration

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