Time Domain Simulation of SWATH Ship Motions

Arthur, Erik K (1988) Time Domain Simulation of SWATH Ship Motions. MSc(R) thesis, University of Glasgow.

Abstract

This thesis presents a technique for predicting the coupled heave and pitch motions of SWATH vessels in the time domain. The emphasis is on completing the essential foundation work required for developing a fully comprehensive, non-linear time domain model. A procedure for solving the coupled motion equations is developed for linear motions and then validated using predictions obtained from equivalent frequency domain analysis. Hydrodynamic quantities are calculated using a two dimensional strip theory method which involves solving source distribution boundary value conditions using the Frank Close-Fit technique. The methods employed for introducing some nonlinear effects caused by the time dependency of motion coefficients and wave exciting forces and moments are described. Results from a computer program written to perform the time domain calculations are used to illustrate the non-linear phenomena and to demonstrate the improved correlation with model test data that can be achieved using non-linear time domain analysis. Further development work is proposed. The influence of motion control fins and the occurrence of cross-structure slamming require careful consideration in SWATH ship design. Suitable approaches to introducing these non-linear effects into the simulation are suggested.

• Item Type: Thesis (MSc(R))
• Qualification Level: Masters
• Keywords: Naval engineering
• Date of Award: 1988
• Depositing User: Enlighten Team
• Unique ID: glathesis:1988-77700
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 14 Jan 2020 11:53
• Last Modified: 14 Jan 2020 11:53
• URI: https://theses.gla.ac.uk/id/eprint/77700