A Method of a Trimaran Vertical Movements Reduction Control and Hardware Realization

Abstract

The vertical movements of a trimaran, which can produce a vertical acceleration, always make people feel seasickness and cause equipment damage on the board. This paper presents a method of a trimaran vertical stabilization control. First, the trimaran mathematical equation is obtained by the numerical simulation and verified by the trimaran experiment in the water tank. Then, the vertical stabilization appendages, including T-foil and flap, are designed and installed at the bottom of the trimaran. Second, an active controller of the appendages is designed and a decoupling method is applied to decouple T-foil and flap, the attack angles of T-foil and flap are obtained in real-time, and the mathematical simulation verified the effect of the decoupling method. Finally, every hardware parts are selected and composed, then, the hardware of the control system is realized and installed on the trimaran, in water tank experiment, the controller was verified in water tank experiment and the experiment results show that it has a good vertical stabilization effect for the trimaran.

Experimental Study on Motion Behavior and Longitudinal Stability Assessment of a Trimaran Planing Hull Model in Calm Water

“…The towing test results were extracted and processed, and Figure 5 plots the total resistance, trim angle, and sinkage of the schemes of the bare hull as functions of the volumetric Froude number Fn. In general, the porpoising of a monoplaning hull often arises at a speed no greater than Fn = 5 [19][20][21][22][23], while the conversion Froude number exceeded 7 in the current paper; this indicates that the planing trimaran showed excellent high-speed performance.…”

“…The effect of a tunnel on a planing trimaran's aerodynamic and hydrodynamic characteristics in the high-speed region were studied by Jiang et al experimentally and numerically [17,18]. Zeng et al and Liu et al introduced the mathematical motion equations of a trimaran, then introduced a T-foil and a flap and discussed the effects on vertical stabilization control [19,20]. Lu et al studied the coupling action of a stern flap and step on a monoplaning hull, both experimentally and numerically [7].…”

“…For further comparison, previous works related to the current study on planing hulls (especially trimaran) in recent years are presented in Table 1. [19,20]…”