Two-Channel Laser Vibrometer Techniques for Vibrational Intensity Measurements: Part 2—Longitudinal Intensity

[+] Author and Article Information
T. E. McDevitt, C. B. Burroughs

Applied Research Laboratory, The Pennsylvania State University, P.O. Box 30, State College, PA 16804

G. H. Koopmann

Department of Mechanical Engineering, The Pennsylvania State University, 157A Hammond Building, University Park, PA 16802

J. Vib. Acoust 116(1), 100-104 (Jan 01, 1994) (5 pages) doi:10.1115/1.2930384 History: Received November 01, 1991; Online June 17, 2008


This paper extends the application of a two-channel vibrometer technique from the measurement of flexural energy flow (detailed in Part 1) to the measurement of longitudinal energy flow. The two-channel longitudinal energy flow equations and two one-dimensional validation methods are presented along with a discussion of how laser vibrometry functions for the measurement of in-plane vibratory motion. Adaptations of the energy flow equations to laser vibrometry are also presented. Experimental results are illustrated which contain the influence of a bending-induced longitudinal component of motion. Through a mathematical model, the measurement of the longitudinal energy flow is shown to be accurate if the influence of bending-induced longitudinal motion is removed.

Copyright © 1994 by The American Society of Mechanical Engineers
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