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A seakeeping analysis method for an air-lifted vessel

Xie, N. and Vassalos, D. and Jasionowski, A. and Sayer, P. (2008) A seakeeping analysis method for an air-lifted vessel. Ocean Engineering, 35 (14-15). pp. 1512-1520. ISSN 0029-8018

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Abstract

A seakeeping analysis in the frequency domain is presented to predict the motion response of an airlifted vessel (ALV) in waves. The ALV is supported by pressurised air in two separate cushion chambers; the pressure variation in the cushions has a significant effect on the motions of the vessel. The adiabatic gas law is used to couple cushion pressure and the free-surface elevation of water inside the chamber. Attention is focused on the waves generated by the pressure, and a method is presented to compute the corresponding free-surface elevation. New numerical schemes are proposed for calculating the threedimensional free-surface elevation for the four wave numbers. Numerical results of the free-surface elevation, escape area, escape volume and motion responses of the ALV are provided. & 2008 Elsevier Ltd. All rights reserved.