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The hydrodynamic of zero-speed fin keeps no longer approximate ratio relationship with fin angle, but has a memory nonlinear mapping with the fin angle, angular velocity and angular acceleration, besides its nonlinearity and uncertainty of ship roll motion equation. It not only caused the traditional adversarial based PID controller can't get operation variable directly, but also severely reduced...
When the wave piercing catamaran is sailing in the ocean at a high speed, longitudinal motion might bring some adverse effects on its performance. The vertical acceleration generated makes the passengers and crew sick and the catamaran will be in a short-time failure. On general conditions, a ride control system is adopted to solve these problems. Firstly, a pitching and heaving motion model for the...
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