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Equivalent Viscous Damping Ratio of Steam Turbine Foundation in Nuclear Power Plants

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Abstract:

According to the complex damping theory, the formula to calculate equivalent damping ratio of composite structures is derived from damping stiffness matrix by dynamic analysis. The finite element model of a steam turbine foundation is established. The equivalent viscous damping ratio is calculated from natural frequencies, modes and structural stiffness matrix. Due to the vertical stiffness of spring vibration isolator is larger than lateral stiffness of concrete structure, most of free vibration modes of the foundation are movements of concrete structure. Therefore, the equivalent mode damping ratio is close to the one of concrete structure. The dynamic response is overestimated, if the equivalent mode damping ratio is derived from the average of spring vibration isolator and concrete structural ones.

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Info:

Periodical:

Applied Mechanics and Materials (Volumes 148-149)

Pages:

1113-1117

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.148-149.1113

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Cite this paper

Online since:

December 2011

Authors:

Xiang Yang Zhou

Keywords:

Complex Damping, Composite Structure, Equivalent Viscous Damping Ratio, Nuclear Power Plant (NPP), Vibration Mode

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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