Research On The Dynamics And Control Strategy Of Ship Servo Hoisting Mechanism

With the rapid development of economy and society, water transport plays an important role with the advantages of low cost, big load amount, and so on. In recent years, water transport has occupied a large proportion of transport in the international trade. As the expanding trade, the safety of water transportation has been attracted more and more attention.Marine hoisting mechanism is quite important in port handling. It is widely used in building ports, shipbuilding projects and other kinds of ocean engineering. The safety of hoisting plays an important role in the safety of water transport. Especially in aquatic combat or rescue, it is used to transfer or shift cargo in time. Under this condition, the safety of hoisting process is depended on dynamic stability of hoisting mechanism. The wave-induced motion of the crane ship may produce severe pendulation of hoisting cargo, which brings danger to hoisting process, and sometimes hoisting operations have to be stopped. As a result, serious economic losses and military delay may be caused. Thus, it's very necessary to study how to improve the dynamic stability of hoisting mechanism.In view of the hoisting stability of ship-mounted crane, a new stability control strategy of hoisting is simulated and analyzed in this dissertation. The control strategy of marine hoisting servo system is optimized and improved through several assistant softwares just like Pro/E, ADAMS and MatLab/Simulink toolbox. Result of the simulation shows that the pendulation of cargo could be suppressed very well by this strategy.The mechanism of pendulation of hoisting cargo and the ways to design an effective pendulation suppression system are mainly discussed in this dissertation. The concept of delayed-position feedback is adopted in this pendulation suppression strategy, which can evidently reduce pendulation of hoisting cargo. Consequently, cargo transferring under worse conditions can be realized. Both commercial and military value could be got through the result of this dissertation.