Identification of Vibration of Cooler Tubes With Tube-to-Baffle Impacts

[+] Author and Article Information
S. C. N. Wong

Department of Mechanical Engineering, Hong Kong University of Science & Technology, Kowloon, Hong Kong

J. K. T. Chan

Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong

J. Vib. Acoust 120(2), 419-425 (Apr 01, 1998) (7 pages) doi:10.1115/1.2893846 History: Received April 01, 1995; Online February 26, 2008


A random series of impacts method was introduced for vibration test on tube bundles of coolers. A non-normal Poisson process was employed to establish a model for the method. Experimental analysis of the forcing functions showed good agreement with the model. The method was found to be appropriate for extracting modal parameters of such tube structure. Site investigation on power station coolers proved this method to be convenient and reliable. Tube-to-baffle impactions created nonlinear effects which were shown to be of hard-spring type. A piecewise linear system method was used to handle such situation. The theoretical results were closely correlated with the experimental results.

Copyright © 1998 by The American Society of Mechanical Engineers
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