Ren Junsheng

An H/sub /spl infin// fuzzy controller design via T-S fuzzy model and its application to hydrofoil catamaran

A less conservative LMI-based fuzzy H/sub /spl infin// controller via T-S (Tagaki-Sugeno) fuzzy model is proposed, and applied to attitude control for hydrofoil catamaran throughout its entire operating range. Firstly, a nonlinear system is represented by a T-S fuzzy model. Fuzzy robust control strategy is secondly presented with guaranteed H/sub /spl infin// control performance, which takes into consideration a much closer relationship between subsystems. In this method, the so-called PDC (parallel-distributed compensation) scheme is used to construct the H/sub /spl infin// fuzzy controller. Finally, based on hydrofoil catamaran, HB200B-A1, simulation researches demonstrate that the effectiveness of the H/sub /spl infin// fuzzy controller for attitude control of hydrofoil catamaran is used to attenuate external disturbances, such as waves and winds. It is shown that the drawback of conventional controller for hydrofoil catamaran can be overcome successfully, which is only efficient near the operating point.

Modeling for ship heave and pitch motions in waves based on conformal mapping method

To develop maritime simulator, mathematical model for ship heave and pitch motions has been established based on conformal mapping method. To verify the validity of the mathematical model, the numerical simulation research is carried out with Wigley model M in regular waves with diiferent Froude number. Comparisons between the simulation results and the experimental data manifest that the proposed mathematical model is correct and reliable. Then the mathematical model accesses maritime simulators visual simulation system achieving a favorable effect.