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陈升 《筑路机械与施工机械化》1997,14(4):11-13
针对国产稳定土拌和机原有拌和深度控制器的缺点,提出了一种既能保证拌深,又可使转子一次性达到拌深设定值的双电位器位置控制系统,并从工作原理上对组成该系统的位移检测器、伺服放大器、恒流液压源等部件做了介绍。 相似文献
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为提高海缆的通信保障能力,采用全球定位系统(GPS)和地理信息系统(GIS)技术,设计海缆巡线管理系统。该系统分为数据采集、数据传送和数据中心管理三个组成部分,对巡线员和数据管理员的工作流程进行了具体描述,并分析了系统实现的关键技术;对数据传送的前端硬件系统组成和实现原理进行了详细设计和分析,实现了规范化管理和科学化监督的预期目标。 相似文献
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本文依托某采用环网电站技术的具有世界领先水平的DP2多功能自升式海洋平台实船项目,对这种非常规的动力定位系统的设计难点和要点进行剖析,重点介绍了平台环网电站在过载、短路等故障或扰动情况下的故障隔离和故障穿越技术,并列举了相应的解决方案,最后通过实船验证对该解决方案进行了论证和总结,供类似项目借鉴。 相似文献
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This review presents a systematic summary of the state-of-the-art development of technological solutions, modeling, and control strategies of thruster-assisted position mooring (TAPM) systems. The survey serves as a starting point for exploring automatic control and real-time monitoring solutions proposed for TAPM systems. A brief historical background of the mooring systems is given. The kinematics and a simplified kinetic control-design model of a TAPM system are derived in accordance with established control methods, including a quasistatic linearized model for the restoring and damping forces based on low-frequency horizontal motions of the vessel. In addition, another two mooring line models, i.e., the catenary equation and the finite element method model, are presented for the purpose of higher-fidelity simulations. The basic TAPM control strategies are reviewed, including heading control, surge-sway damping, roll–pitch damping (for semisubmersibles), and line break detection and compensation. Details on the concepts of setpoint chasing for optimal positioning of a vessel at the equilibrium position are discussed based on balancing the mooring forces with the environmental loads and avoiding mooring line failure modes. One method for setpoint chasing is the use of a structural reliability index, accounting for both mean mooring line tensions and dynamic effects. Another method is the use of a lowpass filter on the position of the vessel itself, to provide a reference position. The most advanced method seems to be the use of a fault-tolerant control framework that, in addition to direct fault detection and isolation in the mooring system, incorporates minimization of either the low-frequency tensions in the mooring lines or minimization of the reliability indices for the mooring lines to select the optimal directions for the setpoint to move. A hybrid (or supervisory switching) control method is also presented, where a best-fit control law and observer law are automatically selected among a bank of control and observer algorithms based on the supervision of the sea-state and automatic switching logic. 相似文献
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深圳地铁3号线列车定位策略分析 总被引:1,自引:0,他引:1
主要介绍深圳地铁3号线信号系统列车定位策略,并详细分析列车定位系统的组成和原理,叙述了列车定位过程。 相似文献
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Impact Analysis of the Reduction Effect for Reducing Joint Position of Stick-slip Fault TunnelEI北大核心
Research purposes: Based on an engineering of traffic tunnel, anti-breaking model experiment of large-scale 1 :30 is carried out under fault dislocation. Reduction effect of three working conditions(working condition A of no reducing joint, B of staggered setting of reducing joint and dislocation surface, C of reducing joint set at dislocation position) is comparatively analyzed by analysis of contact pressure, lining strain and lining stress. The optimal location of reduction joint is explored. Research conclusions:(1)The reduction effect of different position of reducing joint is different, such as A相似文献
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高校校园行为文化刍议 总被引:3,自引:0,他引:3
杨金龙 《浙江交通职业技术学院学报》2006,7(4):63-65
高校校园行为文化作为高校校园文化的重要组成部分,对高校的建设和发展起到了积极的作用。本文阐述了高校校园行为文化在校园文化建设中的地位与作用,分析了环境因素对校园行为文化的影响,并就如何加强高校校园行为文化的建设进行了初步的探讨。 相似文献
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翁石光 《南通航运职业技术学院学报》2013,(4):45-47
文章以某轮高压油泵VIT机构发生的故障为例,结合VIT机构的结构组成和调节特性,分析其故障原因.并给出了VIT机构的日常管理注意事项,为提高轮机管理人员的管理水平提供借鉴。 相似文献