一种降低BIT虚警的优化方法

针对基于模型的BIT中的虚警问题,首先分析了引发虚警的信息不确定性;之后基于信息不确定性对诊断决策和虚警率的影响关系,将降低虚警的问题转化为一个对信息不确定性的影响具有抑制能力,同时对故障保持高灵敏度的优化问题;最后采用传递函数矩阵内外分解的方法得到了问题的解.     

微型平台组合导航信息分配新方法

摘要：针对微型平台组合导航系统,在分析以往的信息分配方法的基础上,提出了一种新的信息分配方法。利用阈值构造了故障概率计算公式,按照各个子系统故障概率进行信息分配。设计了IMU、GPS、ADS及超声波构成的组合导航系统,在新的信息分配方法下进行仿真。实验表明：该方法在子系统出现故障时能有效提高系统的容错性能,并改善导航精度。并且采用在线调整阈值的方法能够很好的降低误报率和漏报率。     

Model-based measurement in physiology and clinical medicine

This paper outlines the scope and importance of model-based measurement in physiology and clinical medicine. The nature of model-based measurement is discussed, describing the basic methods for modelling and the criteria to be adopted when choosing models for use in clinical measurement. Having reviewed the underlying principles and approaches, the authors present two case studies. The first illustrates the potential role of model-based measurement in on-line instrumentation schemes for controlling the level of blood glucose in the diabetic patient. In contrast, the second case study illustrates the role of model-based measurement, implemented in an off-line computer scheme, in the management of patients suffering from a form of thyroid disease.     

基于CAN总线的连续墙抓斗起重机安全报警系统设计

针对某一型号国产连续墙抓斗起重机,利用抓斗起重机自身的机电液控制系统,设计了基于CAN总线、PLC与人机交互技术的安全报警系统,阐述了系统的构成、工作原理以及报警功能的程序实现方法．经现场试验,设计的系统很好地实现了安全报警功能．     

Regulated model-based and non-model-based sliding mode control of a MEMS vibratory gyroscope

Control of MEMS vibratory gyros and angular rate estimation form the challenging problem which is the focus of this paper. To this end, the model-based and non-model-based sliding model control (SMC) approaches are presented, and a chattering elimination method called regulated SMC (RSMC) is invoked to improve tracking control of the drive and sense modes of the uncertain vibratory gyroscope. The force-balancing method is employed to estimate the unknown rotation rate and quadrature error term using two desired trajectories for conventional mode with the same amplitude and different frequencies. Finally, effectiveness of the regulated model-based and non-model-based SMC scheme even in the presence of significant uncertainties is demonstrated through simulations.     

基于单片机技术的智能型煤气监控系统

随着小区智能化的发展，对其配套设施也提出了更高的要求。而煤气泄漏具有巨大的危害性，需要对煤气泄漏进行实时的精确监控。文章详细介绍了一种基于单片机技术的煤气智能监控系统，它具有报警限设定、声光报警、现场浓度动态显示等功能，而且具有自动关闭煤气管道阀门、向上位机报警、按键开启阀门的功能。该系统经过多次实际运行，精确度、灵敏度和稳定性均达到设计要求，且造价更低，操作更加方便。     

Model-based calculation of the system behavior of machine structures on the control device for vibration avoidance

Lightweight design of production machines results in a problematically high inclination of vibration. Existing control techniques can avoid those vibrations based on the knowledge of the instantaneous system behavior, which is highly nonlinear and dependent on the machine’s pose. One possibility is to calculate the machine behavior using a model of the machine on the control device. By this, additional and expensive sensors in the machine structure are avoided but it requires a fast and efficient algorithm of model-based system behavior identification calculated online on the control device. In this paper, we describe a new approach for model-based system behavior calculation on the control device for the vibration reduction. Emphasizes lies on the integration of the method into the engineering process, which is shown in the fact that standard models out of the engineering process are used. The approaches and benefits of the technique are shown on a two-axes machine structure.     

基于OGSA的设备故障诊断系统集成研究

目前许多故障诊断推荐使用基于模型的方法,但对于复杂系统,没有单一的方法能满足所有的故障诊断需求。本文讨论了在一个公共的框架内集成不同的故障诊断方案的重要性,并提出基于网格技术的故障诊断系统集成构架,并将其应用到复杂设备的故障诊断中。     

基于DSP气体报警控制器的设计

在工业生产过程中,为了有效监控各种有害气体的浓度,设计了一种以DSP芯片为核心的气体报警控制器。该控制系统由工控机、DCS、气体报警控制电路、触摸屏显示、联动装置和探测器组成,具有以太网、CAN、485通信接口,采用了本安电路的设计思想,实现了有害气体浓度超限报警并给出控制信号的功能。运行结果表明,该系统性能稳定,抗干扰能力强,可以推广使用。     

基于ARM单片机的无线涡轮流量计的设计

传统涡轮流量计需要铺设电源线和信号传输电缆,使用起来极不方便。而现有的无线通信方式繁多,特点不一,为了实现计量点分散情况下流量计的远程实时报警、监测流量等功能,对主要无线通信方式进行了简要分析。给出了以ARM单片机为核心处理器,集成无线通信模块的流量计设计方案,并对涡轮流量计的软硬件进行了具体设计。该方案能够实现流量测量、数据存储、流量显示、远程实时报警、远程监控等功能。     

铁路客车区域火灾报警控制器研究

分析了铁路客车区域火灾报警系统应具备的功能及其在铁路客车微机网络系统下的工作模式,在开发过程中采用了单片机、CAN总线技术。实现了对单节客车区域内火灾报警系统中各探测器的有效管理。开发的系统可运行于现行的列车总线控制系统,与各类火灾探测器构成了铁路客车的火灾报警系统。可实现客车内火警信息的探测、报警。并将探测信息传送到列车总线系统的功能。     

基于GSM网络的柔性制造车间安防报警系统设计

基于GSM网络平台的柔性制造车间报警系统,集计算机技术、无线网络通信技术和测控技术于一体,实现了报警联网和远程监控管理功能[1].该系统可以实时接收远端现场情况的最新资料和报警信息,安防管理人员可以通过收到的信息及时了解前端现场的情况并进行处理.该系统结构简单、实施灵活,并节省了大量的人力和物力,提高了安全生产防范的监管力度和效率.因此研究及应用基于GSM网络平台的柔性制造车间报警系统具有非常重要的现实意义.     

多信息远程统控警报系统的研究

介绍一种多功能多信息远程统一控制的警报系统的实现方法.该系统基于无线和有线相结合的控制方式,采用超短波无线集群、有线专线、GPRS无线接人等多种途径进行互联组网,在强化警报发放报知功能的前提下,能够实现话音、图像、自检信号等多元信息的远程统一控制功能.     

产品数据管理技术的现状与发展

产品数据管理（ＰＤＭ）技术由于具有帮助企业管理与控制企业数据并缩短产品上市时间的强大功能而受到国外大中型制造企业的广泛重视，它可提供现代企业信息管理所必需的数据管理、配置管理与过程管理等工具，因而在ＣＩＭＳ、并行工程等先进制造系统中得到广泛应用。本文重点阐述了ＰＤＭ技术的产生背景、基本概念、体系结构、主要功能、应用领域和主要供应商等内容，研究了利用ＰＤＭ技术帮助企业可解决的相关问题和实现方法，并指出了应用与实施中应注意的几个主要问题     

Scheduling approaches for the batch process industries

The elements of scheduling, a decision methodology which is appropriate whenever competing activities must be assigned resources over time so as to achieve desired performance objectives, are outlined. The key difficulty of such problems, namely their characteristically high combinatorial complexity, is reviewed and the range of approximate as well as exact methodologies which have been advanced for their solution are highlighted. Batch process scheduling problems are shown to be highly structured and resource constrained and thus not readily amenable to the full range of generic solution approaches. Model-based optimization approaches, validation using detailed simulation models, are proposed as the most appropriate decision support technologies for this domain. The optimization models use simplified product recipes, time discretization constructions, linear material and other resource balance constraints, and application specific economic objective functions. The core solution methodology consists of mixed integer and linear programming methods, specialized to exploit model structure. The role of combined continuous-discrete simulation models is to allow adjustment of the scheduling information obtained from deterministic, linear models to account for the detailed recipes, fine grained representation of time, nonlinear state dependent effects, and stochastic operational and order information, which are characteristic of plant operations. It is proposed that the model-based optimization and simulation approaches are inherently complementary and offer the best prospects for the routine creation and validation of robust and economical operational schedules for the batch environment. Work in progress to integrate these methodologies is noted and some open issues discussed.     

基于GSM的塔式起重机安全监控管理系统

针对传统方法只能对单一塔机的运行状态进行安全报警,很难实现对塔机进行大规模的统一管理并进行安全报警的问题,设计了一种解决方案.首先根据塔机安全监控的需要,采用GSM网络的无线通讯技术,分析了短消息的压包和解包过程,并且自定义了通信协议的内容;然后根据塔机安全报警指标,对塔机的运行状态实现安全报警;最后设计了安全监控管理...     

GLOBAL DAMAGE IDENTIFICATION OF THE ‘STEELQUAKE’ STRUCTURE USING MODAL DATA

This paper deals with the important question of structural safety after extreme loadings like an earthquake. The structure investigated here is the so-called ‘Steelquake’ benchmark structure, a two-storey building which was subjected by an artificial seismic loading causing cracks at three locations. The aim of the method is the identification of multiple damage. It is based on the changes of the measured eigenfrequencies and normal modes before and after the pseudo-seismic event. The measured changes of the modal quantities and the physical structural changes are linked together by means of a computational model. This leads to an inverse problem. Four different model-based approaches are discussed and applied to the benchmark structure. The ability of these approaches to find the damage is investigated and it is shown that all three cracks could be identified.     

Lon Works技术在智能小区安防系统中的应用

介绍了一种基于Lon Works技术的智能小区安防系统的主要功能、硬件组成及软件编程,实践证明,该系统具有适应性强、组态灵活、报警准确的特点。     

一种海警舰艇柴油机电子监控报警系统的设计与应用

针对以继电器为主的传统舰艇监控系统存在的接触不良、易磨损、体积大、可靠性低、检修性差等问题,设计了一种封装性能好、环境适应性强、可靠性高,具有记忆、自检、巡检和延时报警等功能的电子监控报警系统.     

可燃性气体监测报警控制仪

介绍一种可燃性气体监测报警控制仪，它不仅具有报警限设定、声光报警、控制输出功能，而且具有时钟、气体浓度显示、故障自诊断功能。现场实验表明：该仪器性能优良，运行稳定可靠。