Research On Speed Control And Tension Fluctuation Suppression Of The Oceanographic Hydraulic Towing Winch

As an important kind of construction machineries, marine towing winches have been widely applied in the marine research and development. Since both hydraulic speed control and tension fluctuation suppression are key techologies for the marine towing winch, the research on them will help to improve the control characteristics and reliability of the marine towing winch.Through theoretical analysis, modeling & simulation, characteristics of different hydraulic speed controlling circuits of towing winches have been studied, special efforts have been focused on the study of dynamic performance of the winches involving counterbalance valves; the basic characteristics and mathematical model of the towed-sytstem have been studied and the principle of tension fluctuation suppression was discussed, a hydraulic control system based on the proportional relief valve has been proposed to suppress the tension fluctuation. Both internel and external controller have been developed for the proposed system and the simulation has proved that both internel and external controller work well.The main contents of each chapter are as follows:In the first chapter,a brief introduction to the marine towing winch has been made, a review of domestic and international reseach progress on speed control and tension fluctuation suppression for the marine towing winch has been introduced.In the second chapter, the basic mathematical models of the pump controlled circuits have been introduced and the characteristics have been analysed. In the pump controlled open circuits, a counterbalance valve has to been involved to balance the negative loads. Counterbalance valves may cause the system unstable, so special efforts have been focused on the dynamic performance analysis of the system involving counterbalance valves.In the third chapter, the basic mathematical models of the valve controlled circuits have been introduced and the characteristics have been analysed.In the fourth chapter, the active and passive prinple of the tension fluctuation suspression has been discussed, and a hydraulic system based on proportional relief valve has been proposed for tension fluctuation.In the fifth chapter, an controller has been proposed for the hydraulic system. The simulation results show that the controller can work well.The last chapter summarizes the paper work, and prospects the direction of future research...