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.

1.
Bond, J. H., “Impulse Testing Validation of a Mathematical Model,” Proceedings of 1st I.M.A.C, pp. 238–242, 1982.
2.
Chang, T. C., and Craig, R. R., “Normal Modes of Uniform Beams,” J. Eng. Mech. Div., ASCE 95, pp. 1027–1031, 1969.
3.
Coliinson and Warneford, “Vibration Tests of Single Heat Exchanger Tubes in Air and Static Water,” B.N.E.S. Vibration in Nuclear Plant, May 1978.
4.
Falsone
G.
, “
Cumulants and Correlations for Linear Systems Under Non-stationary Delta Correlated Processes
,”
Proh. Engg. Mech.
, Vol.
9
, 1994, pp.
157
165
.
5.
Huo and Zhang, “Application of Impact Testing in the Modal Analysis of a Large Structure,” Journal of Moral Analysis, April 1988.
6.
Lin, Y. K., Probabilistic Theory of Structural Dynamics, McGraw-Hill, New York, 1967.
7.
Lutes
L. D.
, and
Hu
S. L. J.
, “
Non-normal Stochastic Response of Linear Systems
,”
J. Engg. Mech. Div.
, ASCE, Vol.
112
, 1986, pp.
1062
1075
.
8.
Pettigrew and Gorman, “Vibration of Heat-exchanger Components in Liquid and Two Phase Flow,” Proceedings of BNES Symposium on Vibration in Nuclear Plant, Keswick, U.K. 1978.
9.
Rogers
and
Pick
, “
Factors Associated with Support Plate Forces due to Heat-Exchanger Tube Vibratory Contact
,”
Nuclear Engg. and Design
, Vol.
44
, 1977, pp.
247
253
.
10.
Singh and Soler, Mechanical Design of Heat-exchangers and Pressure Vessel Components, Arcturus Publishers, 1984, pp. 735, 740–749.
11.
Stratonovich, R. L., Topics in the Theory of Random Noise, Gordon and Breach, New York, 1963.
12.
Timoshenko, Young, and Weaver, Vibration Problems in Engineering, pp. 432–435, 4th ed., John Wiley, New York, 1974.
13.
Wong, C. N., “Vibration Analysis of Heat-Exchanger Tube,” B. Eng (Rons) Degree Project Report, Mechanical Engineering Department, The Hong Kong Polytechnic University. Hong Kong.
This content is only available via PDF.
You do not currently have access to this content.