An intelligent system for multivariate statistical process monitoring and diagnosis

A knowledge-based system (KBS) was designed for automated system identification, process monitoring, and diagnosis of sensor faults. The real-time KBS consists of a supervisory system using G2 KBS development software linked with external statistical modules for system identification and sensor fault diagnosis. The various statistical techniques were prototyped in MATLAB, converted to ANSI C code, and linked with the G2 Standard Interface. The KBS automatically performs all operations of data collection, identification, monitoring, and sensor fault diagnosis with little or no input from the user. Navigation throughout the KBS is via menu buttons on each user-accessible screen. Selected process variables are displayed on charts showing the history of the variables over a period of time. Multivariate statistical tests and contribution plots are also shown graphically. The KBS was evaluated using simulation studies with a polymerization reactor through a nonlinear dynamic model. Both normal operation conditions as well as conditions of process disturbances were observed to evaluate the KBS performance. Specific user-defined disturbances were added to the simulation, and the KBS correctly diagnosed both process and sensor faults when present.     

基于迭代多模型ICA-SVDD的间歇过程故障在线监测

采用多向主元分析的间歇过程故障监测方法需假设过程数据严格服从高斯分布,而且要对监测批次的测量未知值进行预测,这在一定程度上限制了其应用范围.为此通过建立迭代的多模型序列,不仅有效地解决了测量未知值的预测问题,而且考虑了各个间歇过程时间片之间的关联信息.同时,利用独立成分分析方法提取出过程的非高斯信息,通过引入支持向量数据描述方法对独立成分进行进一步建模,实现非高斯特性下的间歇过程故障在线监测.通过一个实际的半导体制造过程的实验研究,表明提出的新方法可以更有效地处理间歇过程数据信息.     

飞机电源系统智能BIT的发展及解决方案

对飞机电源系统智能BIT技术的发展现状进行了分析和总结,从提高故障诊断效能、降低虚警率等方面阐述了智能BIT需要解决的问题,并针对这些问题,从部件级故障模式分析、基于模糊神经网络的故障诊断方法、系统级故障预测、构建集成神经网络与降低虚警率等方面,提出了一个发展飞机电源系统智能BIT的系统解决方案,为提高飞机电源系统可靠性、测试性、维护性的深入研究打下了基础.     

汽车起重机多路阀监控与智能故障诊断系统的远程访问实现

为加强设备管理中心对远程设备监控与智能故障诊断的实时性,提高监控信息的共享能力,提出了基于ASP.NET和SQL Sever 2005,采用B/S模式的汽车起重机多路阀监控与智能故障诊断系统的远程访问实现方法.着重从服务器端到用户端的远程访问实现方法方面进行论述.     

基于数字式智能飞机称重系统原理准确测量飞机机轮轮距

本文通过对数字式智能飞机称重系统原理和力矩平衡原理的介绍和分析,提出了采用数字式智能飞机称重系统和运用力矩平衡原理对飞机机轮轮距(即飞机在秤台上的实际力作用点位置)准确测量的方法,并给出了该方法应注意的事项,从而保证了准确、快捷、方便的测量飞机机轮轮距。     

电梯智能监测系统的设计与实现

本文研究的电梯智能监测系统是一种基于CAN总线的分布式结构,可对电梯运行状态进行智能化监测、数据分析及相关故障报警的特种设备专用系统,它满足国家电梯标准的各项规定,可为电梯安全性及舒适度的提高提供保证.     

起重机稳定性和刚度智能监控装置

在建设工程中，起重安装的工程量相当大，需要使用工程起重机吊装和搬运大体积、大重量的各类设备和原材料，因而其安全性就相当重要，为此，国家将起重机械列为安全性、危险性较大的特种设备，从设计到生产均制定了严格的规范和国家强制性标准。据统计分析，近年来我国大中城市的因起重机事故死亡人数占全产业人数10％～20％，通过全国部分城市对九种特殊工种570起事故分析，其中起重搬运事故198起，占总事故的34．74％，造成巨大的经济损失。     

飞机液压泵测试设备的监测与控制

文章介绍监测与控制在飞机液压泵测试设备中的应用。重点阐述系统的组成及使用效果。     

汽车发动机多品种生产装配线生产监控系统的开发与应用

汽车生产流水线一个重要的特征是多品种的混线生产,针对这种流水线的生产监控系统(PMCProduction Monltoring and Control System)需要完成不同型号产品的批次管理、线上设备的监控、产品加工数据的采集和分析等功能.本文结合在一个发动机装配线上的实施实例,介绍了一种生产监控系统的设计和实施方案.该实施方案以可编程控制器结合上层管理软件,实现对多品种生产投产管理、生产流水线监控、产品制造数据管理等多个功能.对 应的实施系统已经在某汽车制造厂成功运行.     

Prognostic monitoring of aircraft wiring using electrical capacitive tomography

Electrical capacitive tomography (ECT) has been used to monitor sections of aircraft wiring, as a tool for prognostic analysis. To apply the principles of ECT across a cross section of only 4 mm, modification of the basic circuit was required. Additionally, a more novel method of placing the necessary electrodes was needed, this being accomplished by etching them from flexible copper sheeting and wrapping them inside the perimeter of an enclosure. Results showed that at this small scale, it was possible to determine the position of a wire-under-test inside the 4 mm diameter enclosure to about 0.1 mm, and that by measuring capacitance between pairs, it was also possible to determine whether or not the insulation of wire passed between the electrodes was damaged. With more than one wire-under-test present, it was possible to determine whether or not damage was present, and if so, which wire was damaged. By detecting insulation damage in this way, ECT has proven to be a useful tool in prognostic monitoring, helping faults to be found before they become safety-critical onboard an aircraft.     

Condition monitoring of aircraft by quantitative filter debris analysis

Various condition monitoring techniques are used collectively to monitor the health of aircraft engines and transmission, a concept known as Integrated Health Monitoring (IHM). A well-established quantitative technique is Aircraft Oil Analysis (AOA), in which spectroscopic techniques such as Rotating Disk Electrode Atomic Emission Spectroscopy (RDE-AES) are employed to analyse periodic oil samples for wear debris. Usually, no sample preparation is undertaken, as the oil sample containing both dissolved and suspended metallic wear debris is analysed directly. AOA works well for oil-lubricated systems with relatively coarse filtration that allow circulation of the debris and its subsequent abrasive contact with moving components. To avoid this secondary wear, finer filtration is employed on both new and older aircraft. Less wear debris, and thus information, is available in the oil. A technique that quantitatively analyses the wear debris caught on the filter has been developed and is termed Quantitative Filter Debris Analysis (QFDA). Actual oil filters from CF88 Challenger ALF 502L-2C and Hornet F404 engines were obtained in sequence, when possible, prepared by the developed procedure, and analysed with AOA instrumentation. With sufficient results, both normal and abnormal levels of wear rates emerged, as has been recorded and used for AOA. Moreover, trending of the data for sequential samples has demonstrated the capability of GFDA for condition monitoring.     

聚丙烯在线分析系统的研制

介绍了聚丙烯在线分析系统的结构、工作原理和应用方法.采用专利设计的采样预处理系统解决了气固混相样品的在线分析问题,而针对性开发的固体样品流通池保证的光谱的代表性和重复性.实验表明,采用该技术研制的聚丙烯在线分析系统能够在聚丙烯生产装置的粉料输送管线内自动取出气固混相的粉末样品,通过固体样品流通池采集到光谱并分析得到等规...     

船舶分布式智能电力监控系统的研究与开发

针对船舶电力系统智能化低、可靠性差、故障检测能力弱等问题,将传感器、PLC、人机界面技术应用到船舶分布式智能电力监控系统中.对该监控系统的功能和任务进行了分析,建立了管理层、控制层和设备层3个层次之间的关系,提出了平台一体化网络方法.在船舶上对该监控系统进行了实际应用,研究结果表明:该监控系统提高了船舶电力系统的智能化水平、可靠性、故障检测能力,保证了船舶电力系统的安全性、可靠性、优质性和经济性.     

利用MSComm实现智能仪表的集中监视

简要介绍了VB6．0的MSComm控件的功能、属性和使用方法,并结合工程实例介绍了基于VB开发的串行通信程序。     

工业过程智能控制策略的研究

智能控制策略的提出是以仿人的智能控制思想为基础的控制方法.该文针对具有不确定性、建模困难的系统,结合智能控制的思想,提出了一种方便、快速、精确的智能控制策略.     

航空柱塞泵运行状态监测系统设计

该文设计了一套航空柱塞泵运行状态监测系统,介绍航空柱塞泵模拟试验台工作原理及监测系统设计思路,运用PLC控制系统采集与处理航空柱塞泵运行状态关键参数,利用Lab VIEW软件实现相关数据的分析与实时显示,结合OPC技术,实现了PLC与LabVIEW间的数据通信,进行航空柱塞泵运行状态参数监测,对保障航空柱塞泵安全稳定运行具有重要意义。     

液压油污染度的在线监测技术

总结了机械液压油污染的来源,陈述了光散射法检测原理,提出了一种双参考监测系统,分析了监测系统影响因素,讨论了信号噪声来源及处理方法.     

Tool path strategy and cutting process monitoring in intelligent machining

Intelligent machining is a current focus in advanced manufacturing technology, and is characterized by high accuracy and efficiency. A central technology of intelligent machining—the cutting process online monitoring and optimization—is urgently needed for mass production. In this research, the cutting process online monitoring and optimization in jet engine impeller machining, cranio-maxillofacial surgery, and hydraulic servo valve deburring are introduced as examples of intelligent machining. Results show that intelligent tool path optimization and cutting process online monitoring are efficient techniques for improving the efficiency, quality, and reliability of machining.     

基于移动终端的智能监控系统设计

随着网络信息技术的迅猛发展,人们对远程控制和性能稳定的视频监控系统提出了更高的要求,基于嵌入式的无线数字视频监控系统的研发与设计就显得尤为重要。这种无线数字监控系统可以实现许多传统有线监控系统无法实现的功能,所以无线远程视频监控正在不断地取代有线监控,在交通、银行、医院、视频会议等诸多领域发挥着越来越重要的作用。作为安防系统重要的组成部分,视频监控的嵌入式与网络化应用将是该领域的重要研究方向。该文实现的系统基于Open Wrt和ARM平台,采用MJPG-streamer软件实现图像信息的压缩、解码和传送;移动终端基于安卓平台设计应用程序;可遥控的小车配备二维云台搭载摄像头,ARM开发板控制步进电机操控云台,遥控小车移动,实现立体监视。