Transfer-Function-Based Criteria for Decoupling of Secondary Systems
Publication: Journal of Engineering Mechanics
Volume 125, Issue 3
Abstract
New criteria for decoupling of primary-secondary systems have been recently proposed by the first writer. They are defined by a limited variation of the maximum transfer function of a secondary system that is connected to a single-degree-of-freedom primary-secondary system. In this paper, their sufficiency for decoupling is investigated when the two-degree-of-freedom primary-secondary system is subjected to a filtered white noise process of the Kanai-Tajimi power spectrum. Verifications for sufficiency of the new criteria are extended to a secondary system mounted to a multi-degree-of-freedom primary system. Effects of site condition on the criteria are also studied, by varying the characteristic frequency of the Kanai-Tajimi spectrum. The upper-bound mass ratios resulting from the criteria, above which a coupled analysis is required, are compared with the current decoupling criteria mainly used in the design of nuclear facilities. Revisions of the current decoupling criteria are suggested as a result of this study. A simple procedure is recommended and illustrated by an example to apply the new criteria into the analysis and design of secondary systems.
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References
1.
Chen, G. ( 1998). “Sufficient conditions for decoupled analysis and design of in-building equipment.” Proc., 6th Nat. Conf. on Earthquake Engrg., Earthquake Engineering Research Institute, Seattle, Wash.
2.
Crandall, S. H., and Mark, W. D. ( 1963). Random vibration in mechanical systems. Academic, New York.
3.
Division of Reactor Research and Development. ( 1974). “Seismic requirements for design of nuclear power plants and test facilities.” RDT D9-2T(1-74), U.S. Atomic Energy Commission, Washington, D.C.
4.
Gupta, A. K., and Tembulkar, J. M. ( 1984). “Dynamic decoupling of secondary systems.” Nuclear Engrg. and Des., 81, 359–373.
5.
Hadjian, A. H. ( 1977). “On the decoupling of secondary systems for seismic analysis.” Proc., 6th World Conf. on Earthquake Engrg., New Delhi, India, 3, 3286–3291.
6.
Igusa, T., and Der Kiureghian, A. (1985). “Dynamic characterization of two-degree-of-freedom equipment-structure system.”J. Engrg. Mech., 111, 1, 1–19.
7.
Lai, S. S. ( 1982). “Statistical characterization of strong ground motion using power spectral density function.” Bull. Seismological Soc. of Am., 72(1), 259–276.
8.
Lin, W. L., and Liu, T. H. ( 1975). “A discussion of coupling and resonance effects for integrated systems.” Proc., 3rd Struct. Mech. in Reactor Technol. Conf., Paper K5/2, London.
9.
Sackman, J. L., and Kelly, J. M. ( 1980). “Equipment response spectra for nuclear power plant problems.” Nuclear Engrg. and Des., 57, 277–294.
10.
“Standard review plan section 3.7.2, seismic system analysis.” (1975). U.S. Nuclear Regulatory Commission, Washington, D.C.
Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 125 • Issue 3 • March 1999
Pages: 340 - 346
History
Received: Apr 13, 1998
Published online: Mar 1, 1999
Published in print: Mar 1999
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