Development and Control Strategy of Subsea All-Electric Actuators

The development of subsea all-electric Christmas trees is an area of focus in the offshore oil industry worldwide.The main difficulties are associated with the development and control strategies for subsea all-electric actuators,which are the most criti-cal components of subsea Christmas trees.A single-motor-level fuzzy PID control with an integrated working condition detection mod-ule and a three-motor redundant-level deviation strategy with coupled joint synchronous control were proposed in this paper to real-ize the real time determination of algorithm parameters according to the working conditions,solve the rapid redistribution problems,and maintain the fast speed of the servo motor of the subsea all-electric tree valve actuator.A synchronous control electrical system was built,tested,and verified through simulation analysis.Test results show that the two redundant servo motors can still control the all-electric valve actuator and provide good synchronization control capabilities despite the failure of one servo motor,and the verti-cal and horizontal vibration values of the system are within reasonable ranges.The synchronous control strategy can be applied to the synchronous control problem of subsea all-electric production systems,which is of considerable importance for the development of subsea all-electric production systems.

无人船技术发展现状及其在渔业中的应用

无人船是能够在多种水域完成自主执行任务的平台。随着人工智能、自动避碰,以及无人导航等技术的发展,无人船的应用越来越广泛,尤其是在渔业领域扮演着越来越重要的角色,是自动驾驶技术在水域环境中应用的重要形式之一。本文介绍了无人船的关键技术,主要包括环境感知、路径规划、目标分析和编队控制技术,并分析了无人船在渔业领域中的主要应用。尽管无人船技术展现出巨大潜力,但也面临释放回收困难、环境适应性差、远距离探测受限和成本较高等挑战。随着技术进步,无人船有望成为渔业资源调查及渔业相关作业的重要工具,并在渔业资源管理现代化方面发挥重要作用。