刍议外置拉线式位移传感器在船闸控制系统上的应用

拉线式位移传感器又名拉绳位移传感器、拉绳编码器、拉绳电子尺,常用于监测船闸闸门和平板阀门的位移、方向和速率等信息,本文主要叙述了拉线式位移传感器的基本原理,分析了外置拉线式位移传感器在应用中遇到的问题,并提出了相应的解决措施,以供大家参考。     

基于PLC控制的水电站闸门越限防护的研究与实现

为了保证水电站闸门安全可靠的运行,必须对闸门行程进行上下限位.传统的限位措施是在闸门控制系统中安装相应的机电限位装置,该措施单一但可靠性不足,更不能检测闸门开度.提出一种闸门越限防护的双重机制:将旋转限位开关及编码器相结合,有效地实现闸门开度检测与行程限制.     

闸门人行桥安全自动阻拦装置研制

本文通过对已经研制成功并投入使用的闸门人行桥安全自动阻拦装置的立项背景、研制方案和试运行现状的介绍,系统阐明了闸门人行桥安全自动阻拦装置对于船闸现场运行安全管理的重要性,为该装置在内河航运中的全面推广提供了技术支持,积累了宝贵经验。     

淮阴闸闸门振动原因初步分析

淮阴闸自2004年开始加固将原钢丝网水泥面板门更换为双主梁斜支臂弧形钢闸门,新闸门投入运行后,发现在多种水位组合情况下,大多数存在不同程度的振动现象,为此我们进行了事专门调试检查,总结了闸门振动情况与开度的关系.     

闸门工程远程监控系统的设计与实践

根据闸门工程的功能,提出设计闸门工程远程监控系统时,应遵循安全可靠、信息分层管理、现地控制优先级最高,集中自动化控制次之等设计原则。结合船闸工程远程监控系统的设计与应用,叙述控制系统网络拓扑结构,为推动水利信息化的进程,促进“数字水利”的建设提供借鉴和参考。     

浅析荔枝朗水库洪水调节及水库调度运行

荔枝朗溢洪道有闸控制,水库调洪计算在同一水位时,运行方式的多样性、灵活性、可控制闸门的开度与下泄流量,最大限度增强下游河道的防洪能力。     

GPS技术在连中线航道整治工程中的应用

GPS技术以其高精度、全天候、高效率和易操作等优点在工程测量领域发挥着重要的作用.本文介绍了GPS技术在连申线LSX-SG-HD1标段工程中的应用,揭示了GPS技术在航道整治工程中的应用前景.     

闸门工程远程溢控系统的设计与实践

根据闸门工程的功能,提出设计闸门工程远程监控系统时,应遵循安全可靠、信息分层管理、现地控制优先级最高,集中自动化控制次之等设计原则.结合船闸工程远程监控系统的设计与应用,叙述控制系统网络拓扑结构,为推动水利信息化的进程,促进"数字水利"的建设提供借鉴和参考.     

基于ARM的灌区闸门集群远程监控系统设计

为解决水利灌区闸门集群的人工现场监控存在的诸多弊端,介绍一种远程自动控制闸门系统,设计了基于ARM的灌区闸门现场控制终端模块,实现现场水利闸门设备和传感器的现场控制和数据采集,利用GPRS技术将现场实时数据传输发送数据至系统服务器,并远程接收控制命令。系统在多个灌区进行了应用实验,实验结果表明:开发的基于ARM的灌区闸门集群远程监控系统运行稳定可靠,实时性好,精度高,适应性强,可以满足灌区信息化建设的要求。     

焦港船闸S36公路桥设计与施工要点

S336公路桥是连申线航道整治工程中的一座大桥,主桥采用（8×20）m＋81．6m＋（8×20）m下承式预应力混凝土系杆拱。本文着重对S336公路桥设讯主桥施工方案、施工要点等方面进行了介绍,认为该种桥型造型美观、经济性较好.     

基于环境容量河段法的船闸优化设计

引入完全深度平均紊流模型,对姚江船闸河道的脉冲状非稳态流场进行了数值模拟,得到河道内盐水流速和浓度场的分布。提出"环境容量河段"的概念,以内河盐水浓度作为控制目标,为在感潮河流修建无泵站船闸提供了一种可行的方案,优化了船闸的水工设计。     

一种新型摩托车防盗锁设计

摩托车作为现代社会人们出行的主要交通工具之一,给人们的工作和生活带来了诸多便利,然而由于当前的摩托车防盗锁设计简单,容易被盗窃分子开锁或破坏,摩托车丢失案件屡屡发生,已经给人民群众带来了较大的经济损失和内心困扰,也给社会治安秩序带来了不稳定因素。基于此,该设计推出了一款新型的碟刹密码多锁栓摩托车防盗锁。该防盗锁外壳设计采用通体钢板结构,内置多锁栓与控锁密码管相咬合的防控结构,通过拨动多个控锁密码管的方式开锁。     

近30年中国综合交通运输体系演进分析

改革开放以来,中国综合交通运输体系的构建取得了很大的成绩,但是,各种运输的发展是不均衡的。通过平均里程系数的分析可知,中国的铁路、公路、水运和民航呈现出较强的互补性,说明内部分工较为合理。所以,目前中国综合交通运输体系应该参照铁路、公路、水运和民航的比较优势进行建设,最终形成布局合理、水陆相通、客货并重,各种运输方式紧密配合、协调发展的综合交通运输网络。     

Output feedback control of electro-hydraulic asymmetric cylinder system with disturbances rejection

To achieve accurate position control of electro-hydraulic asymmetric cylinder system with only available displacement signal, an output feedback controller is proposed in this paper. The dynamic model of the system is expressed as a Brunovsky form, which helps to estimate the system states and simplify the controller structure. Then Levant differentiator is introduced to estimate the position, velocity and acceleration of the asymmetric cylinder system based on the output signal, which can reduce the impact of measurement noise compared to the means of calculating the time derivative of the displacement signal directly. Besides, a high gain disturbance observer is designed to reject the lumped disturbance rejection of the system including parameter uncertainty, modelling error and external disturbance. Moreover, a sliding mode surface is introduced to the controller design and a robust item with continuous function is applied to compensate for estimation errors. According to Lyapunov theory, the developed output controller is pledged to be stable that can realize disturbance rejection control as well as backstepping-free control. Furthermore, a large-size asymmetric cylinder experimental rig is set up to simulate practical applications environment. Comparative experimental results reveal the validity and potential practical meaning of the developed control approach.     

中控门锁系统在五菱汽车上的应用和发展

本文通过对五菱汽车三款不同车型上装配的中控门锁系统进行分析介绍,阐述了中控门锁系统在商用汽车上的应用和变化发展。     

贵州光照水电站水轮机圆筒阀的结构介绍

贵州光照电站水轮机圆筒阈是哈尔滨电机厂有限责任公司自行设计及制造的第一个圆筒阀。简要介绍了光照电站水轮机圆筒阈结构设计的特点。     

Adaptive actuator fault-tolerant control for a three-dimensional Euler–Bernoulli beam with output constraints and uncertain end load

This paper studied an adaptive actuator fault-tolerant control scheme for the flexible Euler–Bernoulli beam in the three-dimensional space with output constraints and uncertain end load. The dynamic models are represented by partial differential equations (PDEs) and ordinary differential equations (ODEs). When part of the actuator fails, an adaptive control scheme is designed to regulate the vibration and stabilize the flexible three-dimensional Euler–Bernoulli beam. Barrier Lyapunov Function (BLF) is adopted to realize output constraints of the system. Adaptive control law with projection mapping operator is designed to compensate for the end load which is uncertain and bounded. The goal of this paper is to suppress the displacement of the flexible three-dimensional Euler–Bernoulli beam which can be constrained in given bounds under actuator fault and uncertain, bounded end load. It is confirmed that the proposed control scheme can deal with the vibration, adaptive actuator fault-tolerant control, uncertain and bounded end load and output constraints of the system simultaneously. Finally, numerical simulations illustrate the effectiveness and feasibility of the method.     

LW10B-252型断路器机构油压对同期性及分、合闸时间的影响

分、合闸不同期,将使系统在短时间内处于非全相运行,可能会引起中性点电压位移、过电压、加大重合闸时间,对系统稳定性不利。本文对LW10B-252型断路器进行试验,分析了液压系统油压在闭锁范围内和分合闸时间的关系以及对同期性分合闸的影响。     

一个船舶维修定额管理系统的设计与实现

针对修船厂对船舶设备维修管理的不规范、对维修信息利用不充分等问题,在基于MVC模式和.NET开发平台的基础上,设计并实现了一个船舶维修定额管理系统。通过这个系统的使用,能够大力提高修船厂的维修定额管理水平和工作效率。     

Adaptive finite-time fuzzy control for hybrid levitation system of maglev trains with active anti-lock constraints

The great risk of the suspension contact tremendously restricts the practical public service of hybrid maglev trains. If an operational train contacts to the guideway resulting in the “lock” state, it would cut down its lifetime or even endanger passenger safety. To address the deadlock problem of hybrid maglev trains, a novel adaptive finite-time fuzzy control with active anti-lock constraints is proposed in this paper. First, an efficient fuzzy-logic system is applied to approximate the hybrid levitation dynamics, not only precisely describing the system but also reducing computation burden. Moreover, by a novel nonlinear coordinate transformation, an anti-lock levitation controller is designed to prevent suspension contact between trains and guideways via the back-stepping technique. In the process, command filtering is utilized to circumvent the derivatives of virtual control variables and to address practical input constraints. Differing from the barrier Lyapunov function technique, the proposed nonlinear transformation helps to directly address both positive lower and upper boundaries. In addition, finite time convergence is achieved by the proposed scheme, which enjoys the characteristics of a fast and quantifiable response. Numerical simulations verify the theoretical results.