随机海况下自控式截流板减纵摇研究

Study on Pitch Reduction of Self-Control Interceptor Under Random Seas

文中针对过渡型艇减纵摇问题以某过渡型艇为对象,建立随机海浪模型,基于势流理论得到波浪干扰模型和船舶运动模型,并结合CFD方法计算得到的目标艇的截流板升力和升力矩模型,设计了PID控制器和滑模鲁棒控制器,分别搭建开环和闭环控制系统,并对运动计算结果进行比较.在实际约束条件下,分别采用两种控制器的闭环系统相较于开环系统都展现出不同程度的减纵摇能力,其中采用滑模控制器时,三级海况下纵摇幅值可减小34%,五级海况下亦可达到8%.自控式截流板减纵摇系统能够有效减小过渡型艇的纵摇运动,滑模鲁棒控制器在三级海况下比PID控制器更优,在四、五级海况下也有良好的减摇效果.

Aiming at the problem of pitch reduction of transitional boat,a random wave model was established for a transitional boat.Based on the potential flow theory,the wave interference model and ship motion model were obtained,and the lift and moment models of the closure plate of the target boat were calculated by CFD method.PID controller and sliding mode robust controller were designed,and open-loop and closed-loop control systems were built respectively,and the motion calculation results were compared.Under the actual constraints,the closed-loop system with two controllers shows different degrees of pitch reduction compared with the open-loop system,in which the pitch amplitude can be reduced by 34%in the third-class sea state and 8%in the fifth-class sea state when the sliding mode controller is used.The automatic damping system of the closure plate can effectively reduce the pitching motion of the transitional boat,and the sliding mode robust controller is better than the PID controller in the third-class sea conditions,and it also has good damping effect in the fourth and fifth-class sea conditions.