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Abstract
ABSTRACT The harsh ocean environment and complex operating conditions require high dynamic positioning (DP) capability of offshore vessel. The design, development, and performance evaluation of DP systems are generally carried out through numerical simulations or scale-model experiments. Simulations are a convenient and inexpensive alternative to experiments, but may not be practical due to the simplicity of the model. Thus, this paper presents a hybrid simulation and experiment test platform for DP vessels. For realistic calculating environmental loads and kinematic responses in hydrodynamic simulations, the 6DoF model is used to describe the dynamic response of DP vessels, considering fluid-memory effects and frequency-dependent hydrodynamic parameters. In the experiments, similarity theory based on the same Froude number is used to ensure consistency of the control parameters with the simulations, reducing the time for experimental tuning. Finally, a case study of a DP shuttle tanker is used to verify the credibility of the test platform.
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