Research On Lift Modeling And Control Strategy Of Transformative Fin At Low Speed

disturbance of ocean wave,sea breeze and ocean current. For the need of comfort and safety in the navigation, we must use effective method to keep the ship stabilization. Installing the anti-rolling fin is the most effective method at present. According to the different ship speed, fin stabilizer is also corresponding divided into zero-speed, low-speed and the high speed stabilizer fins. At present, both foreign and domestic, the research of medium and high speed stabilizer fins has tended to mature, and anti-rolling effect is basically able to reach above 90% . At home and abroad people gradually began to study zero speed and low speed of the anti-rolling. Zero-speed fin stabilizer has installed ship in foreign countries. and anti-rolling effect is very good, At domestic ,Harbin Engineering University, Institute of ship controlling, is also fruitful of zero-speed fin research. But the low-speed phase of the anti-rolling study , abroad and domestic is still blank. In order to achieve the speed from zero through the low speed to high speed full-speed rolling, this paper has done a preliminary theoretical study of low-speed fin.The dissertation is base on project supported by national science foundation of China: Research on lift theory of ship bionic roll stabilization at zero speed(50575048) and Research on anti-roll of underwater vehicle near surface based on Transmutative Fin (50879012).Paper first describes the character of low-speed navigation, as well as the theory of deformation-based biomimetic fin technology and selects the non-symmetrical Ru Murkowski airfoil as study object. Then described from the low-speed fin works principle as well as specific ways of working reference to the more study fin-- the zero speed stabilizer fins to progressively demonstrate its feasibility. Then started the most important content of this paper—solving, the low-speed deformation fins lift model. Make the complex process of fins flapping in the water divided into fin surface in an ideal fluid and non-ideal fluids two cases to study. Separately obtain the lift formulation, get the sum in order to obtain the final lift formulas. In order to verify the correctness of its lift model, this paper has taken the more international authoritative application software of Fluent, simulated fins face movement in a real fluid, get several groups of lift values, compared the theoretical models and calculation software obtained lift values , analyzed the reasons for the deviation, confirmed the reliability of theoretical model.In this paper, followed by controller designing one part of low-speed ship roll stabilization system, and applied SPIDNN controller which on-line control have good effects to the anti-rolling system , completed the controller design of this system.Finally the article use the lift model and controller, and other anti-rolling system consisting parts comprise of low-speed ship roll stabilization systems Using the simulink of Matlab software simulated for different conditions of the sea, obtained under a variety of sea conditions not anti-rolling and rolling ship rolling angle map. Evident from the graph we can obtained that install this low-speed fin the system have good anti-rolling effect. And concludes that using SPIDNN-controller,the anti-rolling system efficiency obviously better than traditional PID controller.In this paper, on the basis of the zero speed fin, made a preliminary theoretical study on low speed and deformation fin technology, has laid a certain foundation for future in-depth study.