International Journal of Ocean Engineering and Technology Speciallssue:Selected Papers

Korean Society of Ocean Engineers (한국해양공학회)
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Design and Analysis of Dynamic Positioning System Using a Nonlinear Robust Observer

  • Published : 2002.12.01
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Abstract

A robust nonlinear observer, utilizing the sliding mode concept, is developed for the dynamic positioning of ships. The observer provides the estimates of linear velocities of the ship and bias from slowly varying environmental loads. It also filters out wave frequency motion to avoid wear of actuators and excessive fuel consumption. The main advantage of the proposed observer is in its robustness. Especially, the observer structure with a saturation function makes the proposed observer robust against neglected nonlinearties, disturbances and uncertainties. Since the mathematical model of DP ships is difficult to obtain and includes uncertainties and disturbances, it is very important for the observer to be robust. A nonlinear output feedback controller is derives based on the developed observer using the observer backstepping technique, and the global stability of the observer and control law is shown by Lyapunov stability theory.. A set of simulation was carried out to investigate the performance of the proposed observer for dynamic positioning of ships.

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References

  1. Proc. of the IFAC Conference on Control Application in Marine Systems(CAMS'98) Nonlinear Vectorial Observer Backstepping with Intergral Action and Wave Filtering for Ships Aarset, M.F;Strand, J.P;Fossen T.I
  2. IEEE Transactions on robotics and automation v.8 no.6 A Passivity Approach to controller-observer Design for Robots Berghuis, H;Nijmeijer, H
  3. Guidance and Control of Ocean Vehicles Fossen, T.I
  4. Automatica v.35 no.1 Passive Nonlinear Observer Design for Ships using Lyapunov Methods Fossen, T.I;Strand, J.P
  5. Nonlinear Systems Khalil, H.K
  6. Proc. ASME Design and Engineering Tehnical Conferences Application of a Sliding Mode Observer for Dynamic Positioning of Ships Kim, M.H;Inman, D.J
  7. Ph.D. Thesis, Massachusetts Institute of Technology Nonlinear State Estimation using Sliding Observers Misawa, E.A
  8. IEEE Transactions on automatic control v.35 Robot Control by using only Joint Position Measurements Nicosia, S;Tomei, P
  9. Journal of Dynamic Systems, Measurement and Control v.109 On Sliding Mode Observers for Nonlinear Systems Slotine, J.J;Hedrick, J.K;Misawa, E.A