基于LQG的穿浪双体船垂向运动控制系统设计

摘要

Theuniquehullstructureofwavepiercingcatamaranmakestherollmotionsmall,butthe vertical motion becomes serious in rough sea or at high speed,which requires an effective control system to reduce it. The ride control system consists of a T-foil and a transom stern flap,using suitable control strategy so that they can co-ordinate with each other and achieve the best stabilization effect. Firstly, the vertical motion model of the catamaran is established, the hydrodynamic coefficients can be obtained using strip theory. The hydrodynamic characteristics of the T-foil and the transom stern flap is simulated with the help of FLUENT. A LQG controller is designed here on this basis. Research on emulation analysis of the vertical movement of the wave-piercing catamaran. The result shows that the motion control system based on LQG control strategy plays a good role in reducing the vertical movement of the catamaran.%穿浪双体船独特的船体结构使得其横摇运动较小，但在高海况高航速行时垂向运动比较剧烈，为此需要一种有效的控制系统来解决问题。本文设计的控制系统由船首的T型水翼和船尾的纵倾调整尾板构成，运用合理的控制策略使二者统筹配合，发挥最优的减摇效果。首先建立双体船的垂向运动模型，利用切片理论求解水动力系数；然后采用Fluent仿真分析T型水翼和纵倾调整尾板的水动力特性；在此基础上设计LQG控制器，对不同海况下的穿浪双体船的垂向运动进行仿真研究。结果表明，运用LQG控制策略设计的运动控制系统能够很好地抑制双体船的垂向运动。