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Development of a FPSO Motion Simulator

[+] Author Affiliations
Dexin Zhan, Worakanok Thanyamanta, Jason McDonald, David Molyneux

Oceanic Consulting Corporation, St. John’s, NL, Canada

Paper No. OMAE2015-41970, pp. V007T06A021; 8 pages
doi:10.1115/OMAE2015-41970
From:
  • ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 7: Ocean Engineering
  • St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5655-0
  • Copyright © 2015 by ASME

abstract

This paper presents the development of a motion simulator for a moored FPSO, which includes numerical prediction of the FPSO motions in wind, waves and current. It also presents the resulting mooring line tension, 3-dimensional visualization of the FPSO motion, and summary analysis of the resulting motion parameters. The FPSO motion in waves was simulated using an in-house seakeeping code, MOTSIM. A spread mooring line routine, based on catenary theory, was developed and added to MOTSIM to calculate the restoring force of each mooring line. The visualizer (or animator) was developed in-house from open source software, including Ogre, Hydrax and Skyx. It can playback a 3-dimensional view of the simulation (above and below water). The user can view the results in a movie-like format, and change viewing position during the play-back. The user can also run a new simulation from the animator by inputting the required parameters.

The program for analyzing the time dependent responses generated by MOTSIM was developed as a stand-alone program using MATLAB. The analyzer can conduct statistical analysis of time-domain response signals.

A heading control system and a DP control system were also developed in the simulator and can be activated to help control the FPSO motion if required.

A validation of the ship motion prediction and mooring tension was conducted against model experiments using 100-year return period environments with different combinations of wave, wind and current directions.

The simulator was developed as a forecasting tool to help operators predict platform performance based of forecast weather conditions.

Copyright © 2015 by ASME
Topics: FPSO

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