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近年来,随着微处理器技术在控制系统的广泛应用,大、中型船舶主机遥控的速度控制系统多采用数字调速器与电动执行机构配合,不仅能克服传统调速器调速精度有限的缺点,且有利于柴油机控制自动化。但数字式电子调速器,因其软硬件系统高度集成,尤其是核心部件电动执行机构,在使用和维护等方面给轮机管理人员带来很大挑战。不少轮机人员对电子 相似文献
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减摇鳍是人为减小船舶在海浪中横摇最通用、最有效的方法,现今减摇鳍转鳍驱动机构绝大部分利用的是电液伺服作动系统。与电液伺服作动系统,甚至与电动静液作动器(EHA)相比,机电作动器(EMA)具有结构简单、可靠性强和效率高等诸多优势。以现有GJB2860-97型号转鳍作动器为背景,设计一种驱动转鳍机构的大功率机电作动器。阐述了从结构设计到建模仿真的过程,对机电作动器进行详细的集成化设计,分别利用Solidworks及ANSYS软件对机电作动器进行建模仿真,为减摇鳍转鳍驱动机构的全电改造提出了一套设计及建模仿真分析方法。 相似文献
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AUTOCHIEF—Ⅳ主机遥控速度控制系统的电动执行器,它集光、电、磁、机械技术的。应用于一体.本文从实际需要出发,介绍了该电动执行器的结构及各组成部件的作用,并分析了其常见的故障。 相似文献
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近年来,海洋石油支持船采用电力推进方式作为动力的应用越来越多。本文介绍了电力推进技术的主要优点,简单描述了海洋石油支持船的电力推进系统构成,阐述了电力推进系统的关键技术以及国内外现状。 相似文献
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《船舶与海洋工程学报》2020,(3)
Subsea development is moving constantly toward simplification, digitalization, and cost-out strategies because the exploration and production of hydrocarbons are moving toward deeper and remote sea water areas. Usage of all-electric subsea technology instead of hydraulic technology is growing and will be the future of subsea systems due to the former's environmental and functional advantages and reduced costs. The benefits of all-electric subsea systems are health, safety, and environment(HSE)and improved reliability, flexibility, and functionality compared with traditional hydraulic-electrical systems. Existing electrohydraulic technology for a typical subsea system, hydraulic and electric actuators, and subsea manifold valves including valve types and selection philosophy have been reviewed in this paper. Some major worldwide oil companies such as Equinor and Schlumberger have successful experiences with subsea electric actuators. Considering the benefits of all-electric technology especially in terms of cost and HSE, as well as successful experiences of two major oil companies, further research in this area is warranted. One of the gaps in existing reviewed literature is the effect of using all-electric actuators for manifold valves. Thus,three main questions related to electric actuator selection, requirement of safety integrity level(SIL), and effect of using electric actuators on manifold valve selection have been addressed and answered. Forty hydraulic actuated manifold valves from nine past subsea projects in different parts of the world, mainly Africa and Australia, have been selected for the analysis of all-electric actuators. Results show that 93% of the valves require spring-return electric actuators, whereas 7% can be operated with conventional electric actuators without any spring. The manifold valves do not require SIL certification because they are not connected to an emergency shut down system. Introducing the electric actuators to the manifold valve will not change the valve selection philosophy. 相似文献
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深海载人潜水器推力器布置与容错性能 总被引:1,自引:0,他引:1
深海载人潜水器能够搭载科学家至深海海底开展精细化取样作业,已成为人类开展深海科学研究和资源勘探开发必不可少的工具。推力器是潜水器机动的主要执行机构,其合理的布置不仅关系潜器操纵性能也直接影响其故障时容错性能。本文首先系统梳理了现役国内外6台深海载人潜水器推力器的布置形式及其参与推力分配的运动模态,基于推力器布置方案分别比较分析了推力器故障情况下的容错控制方案并和优缺点。结果发现用矢量和可回转推力器代替固定推力器可以提高系统的容错控制能力,本文研究对于后续载人潜水器推力器布置和容错控制设计可提供参考借鉴。 相似文献
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声传输进结构-声腔耦合舱室空间的主动控制策略和机理研究(英文) 总被引:2,自引:0,他引:2
An analytical study was presented on active control of sound transmission into a vibro-acoustic enclosure comprising two flexible plates. Two types of actuators were used, i.e. acoustic actuator and distributed lead zirconate titanate piezoelectric (PZT) actuator instead of point force actuator. Using the modal acoustic transfer impedance-mobility matrices, the excitation and interaction in the coupled sound transmission system can be described with clear physical significance. With the control system designed to globally reduce the sound field, different control system configurations were considered, including the structural actuator on the incident plate, actuator on the receiving plate, acoustic actuator on the cavity, and their combinations. The effectiveness and performance of the control strategy corresponding to each system configuration were compared and discussed. The role and control mechanism of each type of actuator were of particular interest. It was shown that the incident plate actuator is effective in controlling the cavity-dominated modes and the structural modes dominated by the incident plate and receiving plate. Two main control mechanisms are involved in this control configuration, i.e., modal suppressing and modal rearrangement. For control system configuration with only acoustic actuator in the enclosure, the mechanism involved in this arrangement is purely modal suppression. Desirable placements of structural actuators in terms of total potential energy reduction were also discussed. 相似文献
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