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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Grahic Jump Location
(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
Grahic Jump Location
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
Grahic Jump Location
(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
Grahic Jump Location
(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
Grahic Jump Location
(a) Photograph of experiment test rig; (b) experiment setup for oil whirl testing
Grahic Jump Location
(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
Grahic Jump Location
(a) Nonoctave AHWC for the second harmonic of oil whirl; (b) nonoctave AHWC for synchronous vibration




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