海洋平台升降用多工况适应性液压系统设计与控制分析

Design and Control Analysis of a Multi-condition Adaptive Lifting Hydraulic System of Offshore Platform

海洋平台升降系统在工作过程中面临复杂多变的工况以及严苛的海洋环境条件,其可靠的液压驱动系统是海洋平台安全作业的重要保障。该文在介绍海洋平台升降系统主要工作特性以及典型工况特点的基础上,分析桩腿轻载连续升降、桩腿重载间歇升降、故障应急间歇升降三种桩腿运动模式。进一步设计一套多工况适应性液压系统,具备独立位置控制、两组联合位置控制、三组联合位置控制、四组联合位置控制四种控制模式,通过四种控制方式的组合应用,满足三种桩腿运动模式在不同阶段的驱动控制需求。进一步建立单桩腿液压系统的仿真分析模型,研究桩腿升降液压系统的独立位置控制与联合位置控制性能。两种控制方式的仿真结果表明,设计升降液压系统在独立位置控制与四组联合位置控制下均可实现±1 mm的定位精度。此外,设计系统在独立位置控制模式下可实现快速定位,在四组联合位置控制模式下可实现多组升降装置间的均匀承载。

The lifting system of offshore platform is faced with complex and changeable working conditions and harsh marine environment conditions in the working process,and its reliable hydraulic drive system is an important guarantee for safe operation at sea.Based on introducing the working characteristics and typical working conditions of the offshore platform lifting system,this paper analyzes three movement modes of the spud leg under different working conditions:continuous lifting under light load,intermittent lifting under heavy load and intermittent lifting under emergency failure.Furthermore,a hydraulic system is designed to satisfy a variety of working conditions,which has four control modes:independent position control,two-groups joint position control,three-groups joint position control and four-groups joint position control.Through the combined application of four control modes,the driving control requirements of three spud leg movement modes can be met.The simulation model of single spud leg hydraulic system is established to study the performance of independent position control and four-groups joint position control.The simulation results show that the positioning accuracy of the lifting hydraulic system is within±1 mm.In addition,the lifting system can realize a rapid positioning in the independent position control mode and an uniform bearing in the four-groups joint position control mode.