Applied Research Of Electro-hydraulic Proportional Control Technology On The Heave Compensation System

In the deep sea area, because of wind, waves,chung, stream effects, the mothership will heave a greater degree of movement, and the heave motion is passed through the cable or the umbilical cord to the underwater working equipment, then the equipment will follow the mothership generate large fluctuations which will generate significant impact to its safe and reliable delivery, operation and recycling, or even lead to the broken of the umbilical cord or cable and other serious consequences. Therefore, when deep water operations, there must be related to the mother ship heave compensation device to compensate for the heave motion, thus cutting down effect of the hull to underwater work equipment. Only mastered the technology, deep sea resources development was no longer just a plan, But the current domestic research on the heave compensation system is basically in the blank, which severely restricts the development of marine economy in China, so as soon as possible to master the core technology has significant sense to our economic and social development.This paper studies an implementation method of heave compensation electro-hydraulic proportional control technology. Mainly design the active and passive heave compensation approach and the implementation.Involved in the major electro-hydraulic proportional components including proportional relief valve, electro-hydraulic proportional directional flow valve and piston pump (load-sensitive and constant pressure variable can be switched freely.) The portional relief valve which accept the tension feedback signal control cable tension constant, electro-hydraulic proportional directional flow valve controls the normal retractable of the winch,it also accepts tension and platform displacement feedback to achieve the active compensation control. Axial piston pump can achieve load-sensitive and constant voltage variable function by superposition regulator which is constituted of components related to the proportion,in order to achieve the overall system energy.The proportional relief valve adopt dual-stage three way pressure reducing valve as a pilot control valve, the pressure of loop can be fine controlled, In the case of control signal under certain circumstances circuit pressure does not increase with the overflow increase slightly,so accurate realization of the electronic proportional control loop pressure to achieve the precise control of the cable tension in passive heave compensation.electro-hydraulic proportional directional flow valve ensure the pressure before and after the valve port constant by two-way inlet pressure compensation, In order to achieve valve opening is proportional to control flow, while the system used electro-hydraulic proportional directional flow valve has a spool position feedback function can be easy to implement closed-loop control to ensure accurate control of flow through the valve, and ultimately make the actuator motor speed precisely controlled and adjustable.Superimposed on the axial piston pump pressure, load sensing and constant power regulator in order to achieve constant voltage, constant current, constant power and a variety of complex control functions. Using these regulators to achieve a variety of control functions the most important is to improve the performance of the system and reduce power losses.Heave compensation system uses PID tuning control,,the P is used to reduce bias, the D is used to improve the system damping and the I is use to eliminate the steady-state error. To obtain better compensation effect.This system can provide the theoretical basis of application and implementation to such systems...