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Analysis and Experiment on Vibration Isolation Characteristics of a Periodic Truss Raft System
CHENG Shi-xiang;ZHANG Zhi-yi;HUA Hong-Xing
2011, 31 (6):
5-9.
DOI: 10.3969/j.issn.1006-1355-2011.06.002
Utilizing the characteristics of periodic structures and waveform conversion function, a new floating raft with periodic truss structures is proposed. Frequency response functions of the new floating raft are calculated by the finite element method (FEM) and used in the FRF-based substructure method, which establishes a model of the assembled system involving the periodic truss raft as well as a base structure and equipment to evaluate the performance of the raft in an isolation system. Experiment is conducted to verify the simulation results. It is found that the floating raft with periodic truss structures has a better performance in suppressing vibration transmission than the traditional floating raft. When the new rafting system is composed of the floating raft and vibration isolators, the entire isolation system can reduce vibration transmission over a wider frequency band.
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