Fourier Series Analysis of Epicyclic Gearbox Vibration

[+] Author and Article Information
James McNames

Department of Electrical & Computer Engineering, Portland State University, Post Office Box 751, Portland, OR 97207-0751e-mail: mcnames@pdx.edu.

J. Vib. Acoust 124(1), 150-153 (Jun 01, 2001) (4 pages) doi:10.1115/1.1403735 History: Received March 01, 2000; Revised June 01, 2001
Copyright © 2002 by ASME
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Dousis, Dimitri A., 1992, “A Vibration Monitoring Acquisition and Diagnostic System for Helicopter Drive Train Bench Tests,” 48th Annual Forum Proceedings of the American Helicopter Society, Vol. 1, pp. 355–369.
Ma,  J., and Li,  C. J., 1996, “Gear Defect Detection Through Model-Based Wideband Demodulation of Vibrations,” Mech. Syst. Signal Process., 10, No. 5, pp. 653–665.
McFadden,  P. D., and Smith,  J. D., 1985, “An Explanation for the Asymmetry of the Modulation Sidebands About the Tooth Meshing Frequency in Epicyclic Gear Vibration,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., 199, No. 1, pp. 65–70.


Grahic Jump Location
The stem plot shows the amplitude of continuous-time Fourier series (CTFS) coefficients for the total vibration. The solid curve represents the CTFS coefficients for a single planet multiplied by P.
Grahic Jump Location
DFT approximation of continuous-time Fourier series coefficients for the first harmonic of a vibration signal recorded from the upper planetary system of a Cobra AH-1S helicopter gearbox



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