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Shock and Vibration
Volume 2017, Article ID 9135715, 13 pages
https://doi.org/10.1155/2017/9135715
Research Article

Dynamic Modeling and Characteristic Analysis of Floating Raft System with Attached Pipes

1Institute of Vibration, Shock and Noise, Shanghai Jiao Tong University, Shanghai 200240, China
2State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China
3Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai 200240, China
4Information Science and Engineering School, Shandong Agricultural University, Taian, Shandong 271018, China

Correspondence should be addressed to Longlong Ren; nc.ude.utjs@gnolgnolner

Received 18 January 2017; Accepted 3 April 2017; Published 20 April 2017

Academic Editor: Tony Murmu

Copyright © 2017 Longlong Ren et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The vibration transmission performance of a floating raft system with attached pipes is investigated in this paper. The frequency response function-based (FRF-based) substructure synthesizing method whose accuracy has been verified by numerical simulations and experiment is applied for modeling the system. The power flow through the transmission paths is used for exploring the additional vibration transmission path provided by the attached pipes. The results show that the existence of the additional transmission paths caused by the pipes breaks the symmetries of the system, which leads to the enhancement of the coupling between each substructure. Consequently, it degrades the vibration isolation performance of the raft system. Moreover, a parametric study is performed to investigate the effects on the mean-square velocity of the hull of the attached pipes, which gives a brief guideline for designing the attached pipes.