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DP Capability Analysis by Time Domain Simulation Approach

Lookup NU author(s): Dr Arun Dev

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Abstract

Traditional DP capability calculation (DPCap) described in IMCA M140 [1] is the industry standard for DP vessel's station-keeping capability calculation. In DpCap plots, static environmental mean forces are considered only. For dynamic effects, normally a constant percentage is taken into account, e.g. 20% to dynamic allowance. Response times of thruster and controller are not taken into account. DPCap calculation is very suitable for DP vessel design stage, comparing different designs. But in operation planning stage, it cannot answer positioning accuracy or if the vessel will actually maintain position in a limited sea state.DP time-domain simulations is more appropriate to determine DP performance. Vessel mathematical model is used and the equations of motion are solved in time-domain. Normally low frequency model in 3DOF is used and expended to 6DOF to include wave frequency loads and motions. DP controller, state observer and thrust allocation module are designed accordingly to maintain vessel position and heading against environmental disturbance.This paper gives DP performance calculation by a time-domain approach for two different OSV vessel in selected weather condition. Passive nonlinear wave filter, linear quadratic optimal controller and general thrust allocation module are designed for the calculation.


Publication metadata

Author(s): Jinlong M, Krishnan G, Dev AK

Editor(s): Arun Kr Dev

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 6th International Conference on Technology and Operation of Offshore Support Vessels

Year of Conference: 2016

Pages: 131

Print publication date: 08/09/2016

Online publication date: 08/09/2016

Acceptance date: 08/08/2016

Publisher: Research Publishing

URL: .www.osvsingapore.com

Library holdings: Search Newcastle University Library for this item

Series Title: OSV Singapore

Series Editor(s): Arun Kr Dev

Sponsor(s): Keppel Singmarine and Wartsila

ISBN: 9789811107467


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