Ship with main/flap rudder which is effective to improve the lift coefficient

also can reduce energy loss of system

but increase of the control surface will bring angle optimization allocation problem. According to the course control mechanism

the main/flap rudder angle optimization allocation rules is established

and an improved dynamic cuckoo search（ IDCS） algorithm is proposed to improve the global detect and local search ability

in order to achieve the main/flap rudder angles optimal allocation. The simulation result shows that compare to the common rudder

the main/flap rudder can effectively avoid speed saturation and improve course control effect and reduce system energy loss;also compared to GA and CS algorithm

the main/flap rudder allocation strategy based on IDCS algorithm can achieve smaller energy loss indicators

the effectiveness and practical engineering value of the proposed algorithm is proved.