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Abstract

To meet the demand for real-time calculation of time-domain motion equations, a state-space model was established to replace the convolution integral method to improve computational efficiency. On the basis of the HYSY201 vessel, the impulse response curve fitting method and the realization theory method based on the time-domain identification theory were compared to establish the state-space model. The results of roll decay simulation conducted using the state-space model and the convolution integral method were verified against decay test results. The simulation results for retardation function, radiation forces, and motion time histories calculated using the state-space model and the convolution integral method were compared and analyzed. The roll decay simulation results agreed with the model experiment results. The simulation results demonstrated that the retardation function, radiation forces, and motion time histories calculated using the state-space model agreed adequately with those calculated using the convolution integral method. Moreover, the simulation based on the state-space model ran approximately 28 times faster than that based on the convolution integral method. Thus, replacing the convolution integral method with the state-space model improves computational efficiency, while maintaining calculation accuracy.

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