RESEARCH PAPERS: Offshore Mechanics

Adaptive Prediction of the Motion of Marine Vehicles

[+] Author and Article Information
E. R. Jefferys, B. S. Samra

Department of Mechanical Engineering, University College, Torrington Place, London, U.K.

J. Energy Resour. Technol 107(4), 450-454 (Dec 01, 1985) (5 pages) doi:10.1115/1.3231217 History: Received June 25, 1984; Revised May 02, 1985; Online October 22, 2009


A predictor of the future motion of a vessel subject to random wave and wind forces, would have a variety of applications in ocean engineering. Most previous work has assumed that the wave spectrum is known and that the vessel is modeled accurately; both factors affect the predictor performance strongly. In practice, the relevant data is difficult to measure on a manoeuvering vessel and can change significantly with operating conditions. Here were describe the application of an adaptive algorithm which predicts the future of a signal from its history. The predictor adapts to the signal and varies its parameters to optimise the prediction. Operating on a signal with a stationary spectrum, the predictor tends to a steady performance; if the spectrum changes, the predictor quickly adjusts to the new situation. We illustrate the performance of the system with examples.

Copyright © 1985 by ASME
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