基于PMAC运动控制器的开放式数控系统

讨论了开放式CNC的概念,介绍了一种以PMAC运动控制器为核心,工业PC为系统支撑,运行在Windows平台下的开放式数控系统,并阐述该系统的硬件结构和软件设计。实践证明．该系统完全能满足现代数控机床对开放式数控系统的要求。     

基于PMAC的开放式数控系统及其应用

介绍了一种功能强大的多轴运动控制器PMAC卡,并对其特性进行了分析.研究了采用PC+PMAC卡的开放式数控系统的结构及其应用领域.该开放式数控系统具有较强的可操作性和较高的实用价值.     

开放式控制器及其在特种加工中的应用

介绍了基于PC机的开放式数控系统,根据超声-电火花复合加工的加工特点,采用的是NC嵌入PC式结构,构建了基于PMAC运动控制器的超声-电火花复合加工开放式数控系统。该数控系统具有硬件结构的无关性和软件结构的可重构性,是一个具有双重开放性的数控系统。     

基于PMAC的并行双CPU开放式数控系统

提出了一种以PMAC运动控制器为控制系统核心、工业控制机为系统支撑单元的双CPU开放式数控系统。介绍了该系统的功能、硬件和软件设计方法。实践证明，基于PMAC的数控系统完全可以实现人机接口的定制和实时控制部件的参数化。     

基于运动控制卡的开放式数控系统研究及应用

阐述了开放式数控系统的特征和种类,介绍了GT运动控制卡的性能,对开放式数控系统的实例应用——基于“PC+GT- 400- SV运动控制卡”的数控雕刻机系统的硬件构成和软件设计进行了分析.     

开放式数控系统的发展及性能研究

介绍了数控系统的发展概况，阐述了开放式数控系统的提出，讨论了开放式数控系统的结构和优势，并以基于PMAC运动控制器的开放式数控系统为例进行较为系统的分析。     

基于PC的开放式数控系统研究

传统的计算机数控(CNC)系统大多采取封闭式设计,产品的彼此不兼容使得数控系统难以进行结构的改变和功能的扩展。开放式数控系统解决了这一问题,已经成为当前CNC技术发展的必然趋势。本文介绍了开放式数控系统的产生和发展,对基于PC的开放式数控系统结构进行了概述。探讨了以PC机和运动控制卡为基础构建开放式数控系统硬件平台的方法,并讨论了基于W indows 2000的数控系统软件结构。     

基于PMAC的开放式数控系统研究

阐述了数控系统的发展概况,介绍了PMAC运动控制器的性能,深入讨论了基于PMAC的开放式数控系统的结构、优势和性能。     

基于PMAC的活塞车床开放式数控系统

文章简要介绍了多轴运动控制器PMAC的结构及功能,设计了由直线电机驱动的X轴进给机构,并在此基础上重点论述了基于IPC＋PMAC的活塞车床数控系统的硬件和软件设计。     

复合加工中心开放式数控系统设计与应用

复合加工机床是世界机床的发展方向，针对这种先进的数控机床开发出了与其相适应的数控系统。采用Turbo PMAC运动控制卡作为下位机，PC平台和Win2000操作系统作为上位机的结构，组建双CPU开放式数控系统。在开放式软件设计中，采用COM（Component Object Model）技术实现软件的插件化，为软件功能的扩展奠定了基础，便于系统的维护和升级。将该开放式数控系统应用于工程实际中，验证了系统的开放性与实用性。     

Modeling and analysis for a kind of flexible manufacturing system involving time factors

Time control and management are important in flexible manufacturing systems (FMS). The time to finish the machining unit is uncertain because of the uncertainties of the workpieces, so the whole time to finish the FMS is also variable. In order to reduce the time to finish for the whole FMS to improve efficiency, the modeling and analysis method for this timing kind of FMS based on standard Petri net is proposed. The modeling method is a mapping from the machining units to the component of a Petri net, and the timing factors are represented by a timing function on the place set. With the Petri net model obtained and its reachability graph, the timing factors influencing the implementation of the FMS are analysed and presented. In addition, the method is obtained to find the best state line for the implementation of the FMS.     

Simultaneous optimisation of control factors in automated storage and retrieval systems and FMS using stochastic coloured Petri nets and the Taguchi method

Automated storage and retrieval systems (AS/RS) are playing an important role in modern manufacturing systems such as flexible manufacturing systems (FMS). The integration of AS/RS systems and FMS is very complex owing to the complexity of the individual elements. Stochastic coloured petri nets (SCPN) can be used to model, simulate and analyse such a system efficiently and realistically. In this paper, SCPN based simulation, aided by the Taguchi method of design of experiments, has been used for analysing the influence of important factors on makespan, unproductive travel time, and the mean flow time, and is supported by an example.     

扩展有色、时间Petri网及其在FMS建模中的应用

提出一种改进的有色、时间Ｐｅｔｒｉ网——扩展有色、时间Ｐｅｔｒｉ网,有效解决了模型规模和信息显示容量之间的矛盾,图形简洁紧凑,内涵丰富,具有较强建模能力     

An Investigation of Stochastic Analysis of Flexible Manufacturing Systems Simulation

This paper describes the use of an ARIMA (autoregressive-integrated- moving-average) model and its equivalent state space models to produce rule-based knowledge for flexible manufacturing systems (FMS) that can be used to investigate a wide variety of problems including machine breakdown, material shortage, and changes of scheduling rules. One great advantage of using the proposed models is the ease with which the simulation results can be summarised, analysed and captured, as well as the availability of the mathematical representation of the knowledge that can be kept in a knowledge database for evaluation and selection of alternative FMS strategies in a real-time environment. Various case studies are used to illustrate the methodology and the development of ARIMA and state space models, the analysis includes the system cost and stability of changes or interventions, the relationships among the simulation inputs and outputs, and the formulation of the production rule-base for the FMS scheduler. Management can use this integrated approach to describe and predict the dynamic behaviour of a complex FMS.     

FMS调度与控制的统一建模与集成设计

分析了FMS调度与控制统一建模与集成设计的必要性，从FMS运行过程的IDEF0功能建模入手，建立了基于模块化彩色赋时Petri网（CTPN）的FMS调度与控制的统一模型。该模型不仅可描述FMS的调度问题，而且能表达FMS的运行控制逻辑与仿真，从而为FMS控制系统的集成设计奠定了基础。为简化FMS控制系统的设计，提出了虚拟工作站的概念与方法，将FMS控制器的部分控制功能下放到低层的工作站控制层。基于上述CTPN统一模型，开发了FMS调度与控制的集成设计原理和方法。     

Reliability Optimisation of FMS with Spare Tooling

Tool reliability plays an important role in the performance and justification of flexible manufacturing systems (FMS). Failure of a single tool can cause downtimes over the entire system. This results in missing due dates, and inferior products. Therefore, in order to justify the large capital investment associated with FMS, the system must perform in a reliable manner to give an acceptable or expected rate of return on capital. FMS reliability should be studied at the planning and design stages, as tool failures pose a major obstacle to achieving this objective. In this paper, a mathematical model has been developed to determine the spares requirement of the tooling system in an FMS, so that the desired system reliability is achieved and the cost is minimised. The influence of tool sharing on cost, reliability, spares requirement, and tool magazine capacity of the FMS are analysed. The tools and tool transporter are subject to general failure distributions.     

MODELING OF FMS BASED ON UML AND OPNS

0INTRODUCTIONFleXiblemanufactunngsystem(FMS)isanadVancedmanufaeturingtechnology.FMScontrolsoftwaresupportingbothsimulationandcontrolimplementationisp~unttoexploitthefullbenefitsofFMS.Thecontrolsoftwarehastobedesignedtomeetthereal-timeconstraintsofaPnductionsystemanddynamicallychangingneedsOfthemalket.Hence,developmentmethodologiesarecriticaltodesignandimplementreusableanddrintainablecontrolsoftwaretorealizethefullbenefitsofFMS.ItisdifficulttouseanyonemethodtomodelsocomplexsystemasF…     

基于OPN的FMS单元控制器设计

分析了在递阶控制体系下FMS单元控制器的功能与结构。基于面向对象的思想,从设备层到工作站层再到单元层逐步扩展,建立了FMS的面向对象Petri网(OPN)动态模型,在此模型基础上,增加与系统调度和实际设备监控相关联的设备状态库所、控制库所和决策库所,使其扩展成为运控OPN。以运控OPN为核心并结合其他功能模块给出调度与控制集成的单元控制器软件结构,按照这种结构开发FMS单元控制器,并应用于北京交通大学教学型FMS。