基于PLC的危险气体存储监控系统设计

介绍了一种以PLC为控制核心的危险气体存储监控系统,给出了系统组成及相关的软件设计。     

A fast spatial representation method (applied to fixture design)

A type of cellular-decomposition, solid-model representation based on variable orthorhombic cells and using a threedimensional matrix data structure is presented. It was developed to do two things that other representation methods cannot do easily or quickly. This method directly provides information concerning intersecting components, and it is fast enough to allow checks for intersection to be made in iterative routines. The method has application to layout design where interference checking is important. The method and the essential algorithms are described. An application to fixture design is presented.     

基于专用电池监测芯片的AGV蓄电池监控系统的设计

介绍以专用电池监测芯片为采集器的AGV蓄电池监控系统的设计思想和方法。通过专用电池监测芯片DS2438可实现对蓄电池组中每只蓄电池的电压、电流、温度、剩余电量及充放电过程的在线监测，可以改善蓄电池的维护效果，从而提高蓄电池的使用寿命。着重介绍了该系统的设计原理及软、硬件设计。     

振动在线监测系统在港口机械的应用

港口大型机械是港口作业的关键设备,一旦出现故障不但造成经济损失,甚至是人员伤亡.随着港口自动化程度的提高,以及无人码头的出现,对设备各工作机构的运行状态监控提出了极高要求.为了保证港口机械运行机构传动链部分的安全稳定运行,势必要实现远程化、无人化和精准化的状态监测,文中提出了一种港机传动链的在线监测方案,通过对传动链进...     

油管壁厚在线监测系统设计

在石油储运过程中,由于油管周围环境以及石油内某些化学物质的影响,油管内壁要受到不同因素的腐蚀和破坏,使壁厚变小,严重影响石油的运输。本文在综合评价各种管壁厚度监测系统及测试技术的基础上,确定了以超声波测试技术为基础,以计算机技术为核心的管壁厚度在线监测系统设计方案,详尽介绍了该系统各组成部分的硬件结构、工作原理,着重阐述了系统硬件设计。     

大型粮食仓储运输系统的计算机监控

阐述了某港口粮食仓储运输系统的结构、功能和计算机监控系统的设计方法,建立了基于PROFIBUS现场总线的监控网络,重点介绍了组态控制技术在大型仓储运输系统中的应用。     

蓄电池在线智能监测仪的设计

蓄电池作为电力系统的后备电源，其维护工作对保证电力系统的安全运行具有重要意义。对蓄电池实施在线监测并及时发现失效电池，是蓄电池维护工作的重中之重。文中介绍一种以单片机ADuC831为核心的新型蓄电池在线智能监测仪，能实现对蓄电池无论在浮充状态还是充、放电动态过程中的状态检测。着重介绍其软硬件设计方法。     

A real-time virtual monitoring system of the skin factor for matrix acidizing treatments

It is known that oil well productivity can be correlated with the quantification of the damage to the formation (skin factor) and that oil well stimulation through acidizing treatment may be used to improve the permeability of the well pore and restore oil productivity. Current monitoring systems of the skin factor have focused on acid treatments with a single-phase, in which the determination of skin factor is carried out via simplified models in a closed-form, avoiding the need for a real-time platform. However, the combination of several injected fluids is a common procedure in matrix acidizing treatments, giving rise to the formation of foams and two-phase flow. In this case, the real-time estimation of the skin factor requires robust models whose numerical solution should be synchronized with the dynamics of the matrix acidizing treatment in a real-time platform.This paper presents a real-time virtual monitoring system in the wellbore of an oil field to monitor the evolving skin factor during gelling foam acidizing treatments, in which the estimation of the skin factor is conditioned by real-time constraints. The system performance is evaluated using field data available from the stimulation treatments in oil wells located in southeast Mexico. The output results indicate that the real-time virtual monitoring system can successfully predict the evolution of the skin factor. This information is useful for the control and optimization of matrix acidizing treatment.     

金属腐蚀在线监测系统的研制

基于电化学线性极化和弱极化测定方法，本文设计了一种金属腐蚀速率在线监测系统．成功地实现了金属腐蚀速率和极化电阻的自动在线监测和实时数据显示。对比实验表明．监测系统性能稳定．测量速度快、测量结果可信。     

一种基于飞轮储能系统的新型动态电压恢复器

为了克服传统动态电压恢复器无储能装置的不足,提出了一种基于飞轮储能系统(FESS)的新型动态电压恢复器(DVR)。根据飞轮充电要求,对DVR拓扑结构进行了研究,给出了DVR在不同工作模式下的控制策略:在飞轮充电过程中,采用脉宽调制(PWM)整流技术,实现了单位功率因数控制;在补偿电压暂降时,电机采用半桥能量回馈控制,以保持直流母线电压恒定,逆变器采用双环控制策略,补偿电压暂降的同时有效地抑制负载干扰和参数变化。实验结果验证了拓扑结构和控制策略的正确性。     

远程在线监测及故障诊断中心的精细化监测体系在装备制造企业的实现

在线监测系统具有实时监测和预警功能。陕鼓远程在线监测与诊断中心可以为用户快速提供各种设备运行维护、检修维修决策的参考信息。通过多年的机组设计生产及设备检修维修服务经验,开创了适合国内大多数大型旋转动力设备的精细化监测体系,并在实际运行中不断完善,为基于状态的设备维护维修及国内信息化在线监测体系发展提供了参考。     

The design of a single-chip tool monitoring system for on-line turning operation

Tool condition monitoring systems play an important role in a FMS system. By changing the worn tool before or just at the time it fails, the loss caused by defect product can be reduced greatly and thus product quality and reliability is improved. To achieve this, an on-line tool condition monitoring system using a single-chip microcomputer for detecting tool breakage during cutting process is discussed in this paper. Conventionally, PC-based monitoring systems are used in most research works. The major shortcoming of PC-based monitoring systems is the incurred cost. To reduce costs, the tool condition monitoring system was built with an Intel 8051 single-chip microprocessor and the design is described in this paper. The 8051 tool monitoring system uses a strain gauge for measuring cutting force; according to the force feature, the tool monitoring system can easily recognize the breakage of the cutting tool with its tool breakage algorithm. The experimental results show that the low-cost 8051 tool monitoring board can detect tool breakage in three successive products successfully.     

A new symbolic representation method to support conceptual design of mechatronic system

Regarding the typical mechatronic system that realizes controlled motion behaviour as the research object, the mechatronic system is composed of three subsystems, they are generalized executive mechanism subsystem, sensing and testing subsystem, and information processing and control subsystem. Based on the three subsystems, a new kind of symbolic representation method to represent a design scheme of mechatronic system is presented. This symbolic representation method includes graphical symbols, literal symbols and port information flows on the abstract layer of basic mechatronic function units in common use. Two applied instances are given. The method standardizes scheme representation of mechatronic system. The purpose is that the computer can identify and operate the standardized scheme representation. Furthermore, the method can be implemented in connection with related knowledge base to produce creative scheme. The symbolic representation method provides theoretical basis for computer aided conceptual design of mechatronic system.     

站台门与信号系统接口故障在线监测系统设计

针对站台门系统与信号系统接口存在的故障问题,该文提出一种对双方接口命令信号实施在线监测的方案。通过采集双方接口命令信号,采集信号经过电路调理、隔离、放大、微控制器处理后传输到人机显示界面,最终以曲线图的形式将接口信号电压实时显示。该系统设计中采用信号隔离技术,降低监测系统对双方接口设备的影响。该监测系统在站台门系统工程样机上进行了测试,结果表明该系统能够准确、可靠、实时对接口信号电压正负值进行有效地监测,从而达到对接口信号的跟踪溯源,具有一定的推广应用价值。     

钻井船灰罐物料监测系统设计

由于海上风浪大,工况比较恶劣,钻井船在进行固井输灰时灰罐存在摇摆,灰罐物料重量监测极易出现较大偏差.该文通过对钻井船灰料监测系统的设计,采用双重测量机制,并细化了灰料体积计算公式,提高了测量精度.     

基于激光分光技术的挤压中心在线监测系统

针对大型挤压机多部件挤压中心对中及在线位置监测要求,介绍了基于双激光光路基准在线监测系统的测量原理、系统组成、光路分布、分光技术的实现,设计了位置信号获取方案及集成分光光电信号转换装置.     

基于.Net技术的ZnO避雷器在线监测系统的研制

ZnO避雷器是电力系统中重要的过电压保护设备．对避雷器进行在线监测非常重要。本文通过分析避雷器在线监测中的问题和难点．提出了一种基于．net技术的避雷器在线监测系统．系统采用了.net技术．同步技术和新型传感器，极大地提高了监测数据的精度和稳定性，系统集现场监测和远程监测于一体，有着很广阔的应用前景。     

小容量单片机软件在线升级实现

随着物联网时代的到来,基于无线网络的远程数据处理也越来越重要。在嵌入式领域,由于只有通过烧写器才能将程序烧入单片机,工程人员不可能都配备烧写器,所以通过串口的软件在线升级就势在必行。通常的升级方式都是针对大容量存储空间,但是由于结构、功耗等方面的考虑,一款产品选用的单片机存储空间也很小,当应用程序已经占用大部分RAM或者FLASH的时候,通常的升级方式就不可行了。针对这种现状,基于Freescale的MC9S08单片机,提出了一种小容量单片机软件升级的方法。该方法运行稳定可靠,具有一定的实用价值。     

汽轮发电机定子绕组端部振动在线监测系统的研究

汽轮发电机定子绕组端部在电磁力作用下,常常引起绕组端部松动和振动超标等缺陷,严重影响着发电机安全运行,对定子绕组端部振动进行实时在线监测是很有必要的。首先分析了绕组端部结构特点和受力振动情况,然后基于LabVIEW8.5语言和SQL Server2000数据库开发了定子绕组端部振动在线监测系统,采用FOA100光纤加速度传感器和瑞博华RBH8351采集卡,实时采集定子绕组端部振动数据,利用后台分析软件实时分析振动特征,功能包括信号采集预处理、实时参数设置、实时报警、时频域分析、振动趋势分析和历史数据查看等功能。     

A novel optical telemetry system applied to flowmeter networks

Recently developed transducers utilise the unique characteristics of Deformed Helix Ferroelectric Liquid Crystal (DHFLC) to linearly and passively transduce small voltage signals into the optical domain. These small optical transducers can be retrofitted to an existing flowmeter network where the true benefits of distributed sensing in the optical domain can be leveraged. Signals from multiple sensors can be multiplexed into a single optical fibre for measurement at a remote location. We demonstrate two methods of signal measurement based on a positive displacement oval gear flowmeter. Utilising a reed switch to produce short pulses, errorless flow rate transduction is possible across all flow rates including very low flows. Using a variable reluctance sensor, completely passive transduction of flow rates can be achieved. The same technique can be applied to any sensing network with an electrical signal output.