Mechanism Research On Coupling Of Fin And Tank In Integrated Anti-rolling System

Nowadays, fin combined with anti-rolling tank integrated anti-rolling system is the most effective way of reducing shake, which can maintain a good anti-rolling capacity and also can improve the safety factor of the ship , with good anti-rolling effect. But the coupling effect of integrated device is complete which caused the nonlinear between the integrated system, The effect of integrated device is not equal to the sum of fin and anti-rolling simply, and will affect each other through the interaction act. So. it is very important to analyze the coupling influence of between the fin and passive anti-rolling tank, and choose rational control algorithm to ameliorate controller performance.After reading lots of reference about integrated anti-rolling system, the influence of parameters of fin and passive anti-rolling tank are analyzed by using fluent software and a controller which based on energy optimal is designed in this paper.The mainly research content of this paper:1. Analyze the working principle of the integrated stabilization system, and research the interaction effect of fin and anti-rolling tank, difference of rolling angle is converted to equal wave angle in the ship equipped with passive tank. The change of wave angle from start to finish of rolling is used to get the effect of anti-rolling tank in rolling process, and the variation is inset to the self-defining function of Fluent UDF. Variation condition of flow field around fin under effect of passive tank is simulated by programming, then pressure profile of fin surface is obtained, and coupling effects of tank and fin in different conditions is realized by simulation, then the foundation of controller design and parameter optimal configuration of the integrated stabilization system is support.2. The equation modal method in vibration theory is introduced into integrated anti-rolling system, and then the equation of integrated anti-rolling system is translated into modal space equation. State-space method is used to find a group of basements of the equation. Then the equation has solution and decoupling of the integrated anti-rolling system is realized, and the modal frequency response function analysis is preceded.3. Integrated stabilization system, due to the presence of variable coupling factors often caused the system to up to less than optimal control status. Design the shake system controller to collect impairment based on advantages of the generalized predictive algorithm of adaptive and robustness, the system can't only reduce the system-inherent coupling, but also eliminate the adverse effects of random interferences from the outside world. In order to verify the effectiveness of the algorithm, tracking characteristics of embedded generalized predictive algorithm control model, and roll angle simulation, results show that the algorithm based on generalized predictive controller has good control effects.4. The integrated stabilization system dynamics model equation shows that this system is hyper chaotic system. Analyze the chaotic behavior of the integrated stabilization hyper chaotic system, and to improve the performance of the chaotic behavior system. And then,combine the chaotic search algorithm and ant colony algorithm to make the PID control parameter optimization realized. Simulation results show that chaotic ant colony algorithm have strong ability to global optimization, and can accelerate the convergence speed of the system. The system performance can be improved significantly.