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Dynamic modeling and optimization of the supporting structure of a propulsion shaft system by an FRF-based substructuring method |
HUANG Xiuchang 1,2,3 SU Zhiwei 1 NI Zhen 1 ZHANG Zhenguo 1 HUA Hongxing 1,2,3 |
1.Institute of Vibration,Shock and Noise,Shanghai Jiao Tong University,Shanghai 200240,China;
2.State Key Laboratory of Mechanical System and Vibration,Shanghai Jiao Tong University,Shanghai 200240,China;
3.Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE),Shanghai Jiao Tong University,Shanghai 200240,China |
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Abstract A FRF-based substructuring method was proposed for dynamic modeling of a propulsion shaft system.The method took into consideration of cross stiffness of oil film,the excitation of both propeller and propulsion machine.The dynamic model of the coupled system was based on two synthesis processes for substructures,i.e.,propeller- propulsion shaft,bearings,coupling,propulsion machine,isolators and hull.FRF-based substructuring sensitivity analysis was employed to evaluate the optimal stiffness of bearings,coupling and isolators under the objective function of mean-square forces and power flow transmitted to the foundation.The proposed method is of great efficiency.For the studied model,the stiffness of the bearings and the isolators should be lowered; the stiffness of coupling should be increased to obtain small vibration transmission.
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Received: 25 July 2017
Published: 15 February 2019
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