并发系统建模与分析研究

基于Ｐｅｔｒｉ网提出一套完整的并发系统需求说明，建模，形式验证的方法。建立概念模型，用于需求规格说明，包括功能图，资源图和约束集。给出概念模型的精练过程，以及由概念模型到Ｐｅｔｒｉ网模型的转换算法。     

FMS Designer: An expert system for flexible manufacturing system design

Implementation of flexible manufacturing technology in the batch manufacturing environment has created major problems for designers and engineers who are responsible for specification and design of flexible manufacturing systems (FMS). The FMS design task appears to be an excellent application for expert systems techniques. This paper describes current results of an ongoing research effort to develop an expert system which analyses the output from an FMS simulation model, determines whether operational and financial objectives are met, identifies design deficiencies or opportunities for improvement, and proposes designs which overcome deficiencies or exploit improvement opportunities. An overview of the FMS design expert system is given and a case study is presented to illustrate how the system operates. Areas for future research are also discussed.     

A dynamic model for the Bendix wrist

Summary The network model approach is used for deriving a complete mathematical model which includes des the kinematic and dynamic properties of the Bendix wrist mechanism. According to the approach, first,the mathematical models of each part of the mechanism are formulated. Then, theschematic diagram which indicates the interconnections of the components forming the system is drawn. Finally, thesystem graph is depicted, which yields all the necessary information about the system. In this publication, in addition to the system graph for the gear-pairs in the mechanism, a new graph has been developed which shows the angular velocity and torque relations among the gears. An illustrative example is given for the application of the complete model obtained.     

Embedding expert knowledge in a decision model: evaluating natural attenuation at TCE sites

This paper describes a generalized methodology that enables the translation of expert knowledge about any complex process involved in a remedial decision into easy-to-use decision tools. The methodology is applied to evaluate reductive dechlorination as a remedial possibility at sites contaminated with trichloroethene (TCE), building on an existing protocol/scoring system put forth by the US Air Force and the US EPA. An alternate scoring system is proposed, which has two major advantages, namely that it: (i) attributes relative weights to findings based on expert beliefs; and (ii) systematically includes negative weights for negative findings. The ability of the proposed scoring system to assess the bioattenuation potential of TCE is demonstrated using data from extensively studied sites.     

空分设备经济运行软件系统的研究与开发

从节能降耗的目的出发,研究开发了针对冶金企业氧气厂空分设备经济运行的计算机软件系统。该系统包括能耗计算和专家系统两部分,结合空分设备的生产实际,以直观准确的表现方式,指导机组调节配合运行,具有操作简单、客观性强的优点和可移植性、可扩展性。     

A Fault Diagnosis Expert System for a Heavy Motor Used in a Rolling Mill

A fault diagnosis expert system for a heavy motor used in a rolling mill is established in this paper.The fault diagnosis knowledge base was built,and its knowledge was represented by production rules.The knowledge base includes daily inspection system,brief diagnosis system and precise diagno-sis system.A pull-down menu was adopted for the management of the knowledge base.The system can run under the help of expert system development tools.Practical examples show that the expert system can diagnose faults rapidly and precisely.     

变速箱结构设计专家系统技术的研究

结构设计是机械产品设计过程中的重要环节，解决结构设计的智能化不但可以缩短产品的设计周期，而且还可以降低成本，提高设计质量。专家系统是解决智能化设计的技术之一。本文讨论有关结构专家系统的几个关键技术，主要包括系统的控制策略，面积对象的知识表达方式及结构设计的并行设计     

Analysis of closed loop supply chain using genetic algorithm and particle swarm optimisation

This paper describes a relational database system for semi-generative process planning for sheet metal parts that emulates expert system capabilities. The system integrates a feature-based relational database for the parts, a forward chaining rule-based strategy for machine selection, both global and feature-specific execution of the rules and a graph theoretic cost optimization model for optimal process plan selection. This system, which is currently being developed for a sheet metal fabrication company, suggests that, using the experience of shopfloor personnel, an efficient integration of feature-based process planning and expert system strategies can be accomplished.     

复合材料固化过程的智能化监控及其智能生产系统

复合材料由于其优良的性能而拥有广泛的应用领域,但其成型工艺复杂,成本高使其应用受到限制。针对成型过程开发智能化技术是提高生产效率和产品质量的有效手段,其中包括建立数学模型,以专家系统、神经网络或分步预测优化的模型系统为中心的在线监控系统。本文作者针对这些智能化工艺技术进行了总结分类和比较,对智能成型工艺系统进行了阐述,包括其功能、结构和辅助部件。分析了关于复合材料智能化生产技术的发展方向和社会效益。     

工程设计的专家系统

本文对人工智能和专家系统的发展概况、工程设计专家系统的基本组成、框图以及知识的描述和知识库的构造作了简要介绍,并讨论了一个简单的应用问题。     

自动化立体仓库出入库决策系统的开发与仿真

在对作业方式、出入库作业方式分析的基础上,开发出了自动化立体仓库的出入库决策系统.系统管理层用Visual Basic 6.0编程语言开发,可实现对系统参数的初始设置,记录和查询出入库信息,货位优化管理和堆垛机的优化调度.监控仿真层的开发选用了组态软件组态王6.5,可实现对立体仓库的输入输出作业过程的动态模拟,并对系统运行结果进行曲线分析.系统数据库平台的构建选用的是Access 2000数据库软件,该数据库平台为管理层和监控层搭建了数据桥梁.进行货位优化管理时要综合考虑分布描述指标、库存量指标、出库分发效率指标这三个指标;按照堆垛机作业路线的优先级来安排堆垛机作业指令;综合考虑货位管理、堆垛机调度和输送机的运送管理这三个问题.通过仿真试验证明了可以得到系统进行优化决策方案.     

基于均衡生产的煤矿主煤流运输系统关键工序效率优化

为了解决X煤矿主煤流运输系统效率低、均衡性差的问题,以关键工序（主井提升）为研究切入点,提出了煤矿主煤流运输系统关键工序效率优化、提升方法。该方法针对主煤流运输系统瓶颈产生的主要因素,利用人机联合作业图确定消除瓶颈的途径。通过采用串行作业改为并行作业,动作经济原则优化动作,改变员工更换频次的手段,使每循环作业时间缩短15.82 s。优化方法使主煤流运输系统平衡率提高9.52%,节拍降低24.06%,日产量提高982.13 t,表明该优化方法的可行性与有效性。     

分布式FMS智能调度和控制系统的研究与开发

介绍了分布式ＦＭＳ智能调度和控制系统的研究与开发情况：提出了一种新的适合于分布式系统建模的网络计时Ｐｅｔｒｉ网ＮＴＰＮ；将ＮＴＰＮ模型与专家系统技术相结合，为系统控制器开发了基于工程的专家系统ＥＢＥＳ；利用面向对象的技术开发了仿真的对象类库，并实现了从仿真到控制的软件重用。     

高层建筑结构初步设计的专家系统

本文通过对结构初步设计本质和内容的分析，提出了高层建筑结构初步设计的专家系统HIPRED的原型系统．它是一个综合集成系统：通过人工神经元网络（ANN）技术存贮专家的设计经验来确定高层建筑的结构体系；利用能连续化地反映高层建筑结构参数分布的基于悬臂梁的结构简化模型，并结合常微分方程求解器COLSYS很好地从速度和精度两方面的匹配来进行力学反应分析；通过人机交互和知识库的引入，系统能够对设计的结构反应参数（位移、周期和地震为）做出评价及对结构做出相应的修改．HIPRED能够帮助设计者在一个较高层次上进行高层建筑结构的初步设计。HIPRED是在Windows环境下，采用面向对象的编程技术（OOP），用C＋＋编写的。     

大型风力机组远程智能监测与诊断系统的研究与开发

该文研究了大型风力机组的远程智能监测与诊断系统的关键技术问题,介绍了系统的开发情况。整个系统采用分布式架构,由数据采集与处理、实时数据存储、智能监测与诊断和人机交互4个子系统组成。智能监测与诊断子系统采用了知识库/推理机架构,推理机是一个自主开发的基于模糊Rete算法的模糊专家系统,知识库中存储了来源于风力机故障实验研究的常见振动故障的诊断知识。通过故障仿真,验证了整套系统的有效性。     

智能化激光显示系统的设计与研究

研制了一套由激光器,图形输入仪,控制计算机,驱动器,光学工作台及大屏幕等六个部分构成的激光显示系统。理论研究得出,大屏幕所显示图形上的任意点P,均存在一与之对应的振镜偏转角确定值,精确控制振镜的偏转角即可扫描到P点。实验表明,系统可成功实现诸如函数图形、光栅衍射图案、光网光柱及文字动画等多功能智能化激光视频图像的动态输出。     

An Equipment Fault-tolerant Control Expert System and its Application

１ＩｎｔｒｏｄｕｃｔｉｏｎＷｉｔｈｔｈｅｗｉｄｅａｐｐｌｉｃａｔｉｏｎｏｆｔｈｅｍｉｃｒｏｃｏｍｐｕｔｅｒａｎｄｔｈｅｉｎｃｒｅａｓｉｎｇｉｍｐｒｏｖｅｍｅｎｔｏｆｔｈｅｌｅｖｅｌｏｆｐｒｏｄｕｃｔｉｏｎａｕｔｏｍａｔｉｏｎ，ｉｎｄｕｓｔｒｉａｌｉｎ...     

Calibration of Expert Judgments Applied to Uncertainty Assessment

Abstract:

This article contributes a methodology for eliciting expert judgment in support of decision analysis associated with the conceptual design of advanced engineering systems. To provide a basis for decision making in the presence of model and input parameter uncertainties, experts in several disciplines can be utilized to provide model parameter estimates to facilitate analyses. The judgment elicitation methodology was developed to cover a multitude of system disciplines using multiple experts. To address consistency in expert assessments, the methodology includes expert assessment calibration means. A sample application of the resultant expert judgment methodology is discussed. An engineering manager can use the methodology described in this article to assess viability of potential courses of action in high-risk or advanced state-of-the-art technology systems development ventures.     

Diagnostic models for engineering process management: A critical review of objectives, constraints and applicable tools

Automated and computer-based systems for the dynamic management of complex engineering processes have been the subject of active research in recent years. Many of these systems have adopted methodology and technology from the field of artificial intelligence and expert system research.

In real-time process diagnosis and process management applications, where model based reasoning may be highly beneficial in terms of speed and functionality, a larger confluence of methods and approaches has started to form. The objective of these applications often includes, besides performing automated fault analysis and diagnosis, also establishing levels of confidence for the results that are obtained. Thus, both deterministic and uncertainty-based models and reasoning frameworks are often needed.

Of interest among the deterministic modeling techniques that can be used in a PMS (Process Management System) are binary trees, rule networks, and graph networks, which in turn include influence diagrams, logic flowgraph methodology and signed directed graph. PMS uncertainty management can be based on formal probabilistic methods, such as Bayesian estimation and updating, or less traditional methods such as certainty factors, Dempster—Schafer theory and fuzzy-set theory. The main features, advantages and disadvantages of the approaches and methods that are suitable for use in a PMS are critically examined and discussed.     

Expert systems in industrial engineering

An expert system can be denned as ‘a tool which has the capability to understand problem specific knowledge and use the domain knowledge intelligently to suggest alternate paths of action’. This paper presents a structured framework for the development of an expert system. The five major aspects of expert system development are: Problem definition; knowledge acquisition, representation and coordination; inference mechanism; implementation; and learning. These aspects are illustrated through the help pf a modular robot configuration prototype expert system. Several industrial engineering applications in the areas of process planning, facilities planning, and maintenance and fault diagnosis are discussed and a comparative analysis of the different systems is presented.