Direct valve closed-loop fin stabilizer

Abstract

The invention provides a direct valve closed-loop fin stabilizer. A gyro of the direct valve closed-loop fin stabilizer detects angular velocity signals of ship swaying, the angular velocity signals control command motors of digital hydraulic valves to rotate for a certain angle according to the number of pulses, and valve ports of the digital hydraulic valves are opened to supply oil to two hydraulic cylinders driving a fin in a differential motion mode to drive a fin blade to rotate. A rotary encoder on a fin shaft performs direct feedback to feedback motors of the digital hydraulic valves to drive valve elements to move to the closing direction until the number of pulses fed back by a sensor is the same as the number of pulses controlled by a controller, the valve ports of the hydraulic valves are closed, the hydraulic cylinders stop moving, the fin blade stops rotating, and direct control over the fin blade of the signals of the gyro is achieved, namely turning angles of the fin stabilizer is directly controlled by wind and wave signals. The direct valve closed-loop fin stabilizer has the outstanding advantages that fin angle feedback signals of the fin stabilizer directly act on the digital hydraulic valves, no operation performed by the controller is needed, steps are reduced, system reliability and stability are improved, and an important improvement on a fin stabilizer control method is achieved.

Description

technical field [0001] The invention relates to hydraulic control technology, more specifically to a direct valve closed-loop fin stabilizer. Background technique [0002] When a ship sails and works at sea, due to the disturbance of the ocean environment such as waves, sea wind, and currents, it is inevitable to produce swaying motions. With the increasing complexity of ship missions and the application of high-tech equipment, large surface ships, as active platforms on the sea, require their swaying in the waves to be as small as possible. Because the ship often needs to sail on rough water, the violent shaking not only affects the navigation of the ship, but also has a negative impact on the equipment on the ship, and brings unsafe factors to the cargo and personnel on board. Therefore, it is urgent to reduce the swaying of the ship in order to ensure the safety of the ship and improve the comfort of the ship. [0003] Fin stabilizer is the most commonly used active ant...

AI Technical Summary

Problems solved by technology

The fin stabilizer controlled by this electro-hydraulic servo valve has problems such as low control accuracy, poor oil pollution resistance, and temperature drift and zero drift, resulting in a high failure rate of the fin stabilizer and difficulties in use and maintenance, which seriously affect the fin stabilizer. use and general performance of the ship

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