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| Design sensitivity analysis and optimization of a floating raft system using an FRF-based substructuring method |
Huang Xiu-chang;Xu Shi-yin;Zhang Zhi-yi;Hua Hong-Xing
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| The State Key Laboratory of Mechanical System and Vibration, Shanghai JiaoTong University, Shanghai 200240，China |
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Abstract Abstract: A general method for the design sensitivity analysis of forces on and power transmission to the base in a typical floating raft system is presented using the FRF-based substructuring formulation. The proposed method gives an expression of design sensitivity in terms of the partial derivatives of the physical parameters of upper and lower isolators as well as the transfer functions of the substructures. An optimization scheme involving the derived sensitivity formula is applied to obtain the optimal physical parameters of isolators of the floating raft system to minimize the mean-square forces transmitted to the base and the time-averaged power transmission to the base, respectively. The simulation results have demonstrated that the proposed method is efficient and accurate, and that the minimization of force transmissibility does not necessarily provide a minimum power transmission.
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Received: 15 December 2009
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2011, Vol. 30 
