Control of seismic and operational vibrations of rotating machines using semi-active mounts |
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Authors: | R Rana T T Soong |
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Institution: | 1. Ove Arup & partners, Los Angeles, CA, USA 2. Department of Civil, Structural, and Environmental Engineering, State University of New York, Buffa lo, NY, USA |
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Abstract: | A dual isolation problem for rotating machines consists of isolation of housing structures from the machine vibrations and
protection of machines during an earthquake to maintain their functionality. Desirable characteristics of machine mounts for
the above two purposes can differ significantly due to difference in nature of the excitation and performance criteria in
the two situations. In this paper, relevant response quantities are identified that may be used to quantify performance and
simplified models of rotating machines are presented using which these relevant response quantities may be calculated. Using
random vibration approach with a stationary excitation, it is shown that significant improvement in seismic performance is
achievable by proper mount design. Results of shaking table experiments performed with a realistic setup using a centrifugal
pump are presented. It is concluded that a solution to this dual isolation problem lies in a semi-active mount capable switching
its properties from ‘operation-optimum’ to ‘seismic-optimum’ at the onset of a seismic event. |
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Keywords: | rotating machines simple modeling seismic control operational control semi-active control |
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