Study on Wave Loads Characteristic of Pentamaran and the Influence of Sponsons’ Layout

Abstract

Abstract: Based on the threedimensional potential theory, the waveinduced loads response RAO of the pentamaran, including the vertical shear force, vertical bending moment and torsion moment at the main hull and the crossstructure sections, was studied. The dangerous sections were derived by the analyses of the distribution of the RAO’s maximum value and the influence of the wave direction. Considering the nonlinear factors, the time history of the wave loads at the dangerous sections with respect to different sponsons’ layouts in irregular wave was calculated, then the significant values of the wave loads amplitude were compared to analyze the influence of the sponsons’ layouts on the wave loads at the dangerous sections, and the optimal arrangement of the sponsons was achieved. Meanwhile, the wave loads were compared with Trimaran. The results demonstrate that the wave loads both on the main hull and crossstructure are smaller when the after sponsons lying at aft quarter length, while the transverse location of the sponsons and the vertical location of the front sopnsons mainly affect the wave loads on the crossstructure, and the existence of the front sponsons can efficiently decrease the wave loads on the crossstructure of the after sponsons.

Key words: pentamaran, three-dimensional potential theory, sponsons&rsquo, layout, wave loads, nonlinear

CLC Number:

U 674.951

WEN Jun-Hua, CHEN Zhen. Study on Wave Loads Characteristic of Pentamaran and the Influence of Sponsons’ Layout[J]. Journal of Shanghai Jiaotong University, 2012, 46(08): 1230-1237.

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