Offshore crane heave compensation control system and method using video rangefinding

Abstract

Provided is an offshore crane heave compensation control system and method using video rangefinding to achieve heave compensation in a directly driven pump-controlled electro-hydraulic heave compensator. The heave compensation and the heave compensator are applicable for special operation and control requirements on a fixed offshore platform and allow the crane to achieve steady lifting of a load away from or lowering of a load on to a supply vessel without being influenced by the motion of the supply vessel caused by ocean currents, ocean winds, or ocean waves. Also provided is a test platform for the offshore crane heave compensation control system using video rangefinding. The test platform provides a realistic simulation for all lifting and lowering processes of an offshore platform crane in offshore environments to study the control of a motion control system on a fixed offshore platform.

Description

technical field [0001] The invention relates to the field of machinery, in particular to a heave compensation control system and method for an ocean platform crane using video ranging. Background technique [0002] Since the 21st century, the world's demand for energy has increased day by day, and the ocean has become the focus of the energy strategies of various countries in the new century. Countries all over the world have increased their efforts in ocean development. With the massive development of offshore oil, large-scale offshore projects are also booming. Regardless of the method of exploitation, the use of marine resources must be based on offshore platforms. Offshore platform cranes are indispensable in offshore engineering construction. Ocean platforms are divided into ocean fixed platforms and ocean floating platforms. [0003] When a conventional crane lifts goods on land, the position of the crane body and the platform where the hoisted goods are placed is con...

AI Technical Summary

Problems solved by technology

However, the passive heave compensation technology also has the following disadvantages: its compensation ability depends on the pressure of the accumulator, the compensation range depends on the stroke of the hydraulic cylinder piston rod, and the compensation speed depends on the flow of the hydraulic cylinder

On the one hand, the supply ship cannot be the same ship. If MRU or motion sensors are installed on every supply ship coming and going, the cost will be very high; The horizontal and vertical distance from the supply ship is very large (at least nearly 100 meters), and the signal transmission is realized through wireless communication. The use of this technology requires that every passing supply ship be equipped with launch equipment, and the installation on the ocean platform Acceptable equipment, high cost, difficult to implement in practice

[0012] In view of the special operation requirements and control requirements of offshore fixed platform cranes, there is no control system suitable for offshore fixed platform cranes. The technology of lifting the load away and stably lowering it to the deck of the supply ship

[0013] At the same time, the hydraulic system of the existing active heave compensation technology adopts a valve-controlled open circuit, which needs to be equipped with a hydraulic oil source and a hydraulic valve group to work. flow loss, the overall system efficiency is very low

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