Abstract:
A new model for
a raft isolation system is proposed, in which the raft supports
two machines on a flexible foundation via a series of isolators.
The interaction between the flexible floating raft and the
non-rigid foundation is studied by the novel approach of power
flow. The power flow input and transmitted in the complicated
compound system are then formulated in closed forms, in which
the coupling between the raft and the foundation is considered.
The effect of the raft flexibility on power flow spectra is also
revealed. This study shows that it may lead to an overoptimistic
evaluation to the effectiveness of the raft isolation when
simplifying the raft to an ideal rigid structure. Thereby, the
reliable estimation and effective design for raft isolation
system are provided.
Key words:
Power flow Flexible Floating raft
Isolation
* This project is supported by National Natural Science Foundation of
China. Manuscript received on October 24, 1995; revised
manuscript March 28, 1996
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