Abstract
For random vibration control in environmental vibration test it is desired that the spectra at the specimen attachment points coincide with the specified reference spectrum. However, this goal is seldom achieved because of the dynamic characteristics of shaker, fixture, and specimen and of the interactions between them in the test frequency ranges. This paper proposes a method for the determination of the optimal reference spectrum which minimizes the spectral deviations between the specified reference spectrum and spectra at the specimen attachment points. The least square method is used for this purpose. This method requires only the measured FRFs at the control point and specimen attachment points in pre-vibration test and is shown through theoretical and experimental results to be effective.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Brown, D. L. and Allemang, R. J., 1989, “Experimental Study of Active Vibration Control of Flexible Structures subject to Forced Vibration,”Proceedings of 7th IMAC, pp. 926–933.
Ewins, D. J., 1984, Modal Testing: Theory and Practice, Research Studies Press, Great Britain, pp. 95–97.
Harris, C. M. and Crede, C. E., 1976,Shock and Vibration Handbook, 2nd Ed., McGraw-Hill, New York, pp. 27-1–27-14.
Klee, B. J., Kimball, D. V. and Tustin, Wayne, 1971, Vibration and Shock Test Fixture Design,Tustin Institute of Technology, California, pp. 12-1–12-6.
Olson, N. L., 1986, “Using and Understanding Electrodynamic Shakers in Modal Application,”Proceedings of 4th IMAC, pp. 1160–1167.
Rao, D. K., 1987, “Electrodynamic Interaction between a Resonating Structure and an Exciter,”Proceedings of 5th IMAC, pp. 1142–1150.
Sweitzer, K. A., 1987, “A Mechanical Impedance Correction Technique for Vibration Tests”,Sound and Vibration, April, pp. 30–34.
Tomlinson, G. R., 1979, “Force Distortion in Resonance Testing of Structures with Electrodynamic Vibration Exciter,”J. of Sound and Vibration, Vol. 63, No. 3, pp. 337–350.
Tomlinson, G. R., 1987, “A Simple Theoretical and Experimental Study of the Force Characteristics from Electrodynamic Exciters on Linear and Nonlinar System,”Proceedings of 5th IMAC, pp. 1479–1486.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kim, J.Y., Yoon, E.J., Chang, S.J. et al. A study on the determination of optimal reference spectrum for random vibration control in environmental vibration test. KSME Journal 10, 246–254 (1996). https://doi.org/10.1007/BF02953663
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02953663