面向小企业群的网络化制造平台的UML建模分析

提出能实现区域小企业群制造资源优化重组的网络化制造平台的统一建模语言(Unified Modeling Language,UML)建模方案.该软件平台由九个子系统组成,建立其总体UML模型,并对其中生产管理子系统的建模做详细阐述.最后根据该建模方案开发面向小企业群的网络化制造平台,并将该软件平台应用于台州黄岩的注塑模模架制造小企业群中.     

开放式装配建模方法应用研究

对开放式装配建模技术进行研究,包括模型的UML表达方式、装配体特征、装配配合公差分析和系统的装配层次分析等。将开放式装配建模技术应用于激光产品的研发中,完成了产品的结构设计、零件与装配的联动设计、装配仿真分析,并建立了产品及其关键部件的数字样机。应用实例表明,开放式装配建模方法能更有效地指导产品由整体构思到样机设计的整个过程。     

多学科设计优化理论的复合数控机床误差补偿技术研究

以多体系统运动学理论为研究基础,针对复合数控机床自身的复杂性,提出用多学科设计优化理论进行误差补偿的方法。该方法将复合数控机床划分为总体系统、几何误差子系统、载荷变形子系统、热变形子系统和伺服系统驱动子系统共五个部分,并通过协同优化(Collaborative Optimization,CO)算法建立复合数控机床优化模型,为开放式数控系统软件的开发做好准备。     

一种网络化三轴数控钻床的设计与建模研究

给出了网络化数控系统的闭环结构,提出了基于网络服务质量QoS和控制性能质量QoP的协同设计思想,并利用UML语言来进行网络化数控系统的设计。以一种网络化三轴数控钻床为例,验证了所提出设计与建模方法的有效性。     

基于Linux的开放式数控系统加工轨迹仿真功能研发

基于Linux的PC+可编程I/O(接口)体系的开放式数控系统,设计了加工轨迹仿真的通用模型。针对毛坯仿真建模时,离散化精度和仿真速度之间的矛盾,提出一种离散模型建立的改进方法,即在均匀网格离散基础上对模型曲率较大处细化网格间距,并以数控铣削加工为例,针对该通用模型和改进的离散矢量建模法研发了三轴数控铣削加工仿真功能单元,实现了加工前试切模拟和轨迹错误检查。通过实际加工零件,验证了所开发加工仿真功能单元的正确性和通用模型在本开放式数控系统中的适用性。     

现代开放式数控系统和我国数控系统的发展方向

介绍了数控系统的最新进展──开放式数控系统,并从更高的起点提出了现代开放式数控系统的设计理念,并从软件的角度,结合计算机的最新技术和现代机械制造技术,提出了现代开放式数控系统应具备的基本特征,初步描绘了基于软件系统的现代开放式数控系统的体系结构图,指出了开发现代开放式数控系统应是我国未来数控系统的发展方向,在我国应大力发展现代开放式数控系统。     

基于UML与多色集合的变更流程优化

分析了某注塑机企业工程变更的实际流程,利用多色集合与UML集成建模技术,对该企业工程变更的工作流过程进行建模。建立了工程变更流程的UML活动图,并根据UML与PS集成建模方法的映射规则,将工程变更流程的UML活动图模型映射为PS关系规则模型。利用PS关系模型的简化规则对UML模型进行结构分析,并通过定量计算,分析了流程中存在的问题。根据分析情况,对原流程进行优化,并对优化后的流程进行计算验证。     

工业机器人解释器的研究

提出了一种基于XML、UML建模和设计模式理论的开放式机器人解释器的实现方法。解释器读取XML语法文件,对机器人指令程序进行词法、语法分析,通过修改XML中的语法规则和UML模型图,可以方便的扩充和修改机器人语言指令。该解释器在VS.NET平台上用C#实现,结果证明了该解释器的正确性和高效性。     

嵌人式多CPU架构的开放式专用数控系统的研发

为方便快捷地开发出数据控专机控制器,研发开放式专用数控系统作为专机控制器开发平台,允许第三方设备接入并进行互联与互操作。提出开放式专用数控系统的功能模型、数据模型、结构模型和行为模型,采用嵌入式多CPU架构实现了分布型开放式专用数控系统,采用双数据区同步方案解决了分布式系统中数据的同步维护问题。该系统在轴承套圈数控车削中心得到了成功的应用,实现了该数控专机的系统开放性和运动轨迹的参数变量编程控制的预期目标。     

基于UML和Petri网的I-MES建模研究

为了对可集成制造执行系统的行为提供支持 ,需要对其进行有效的建模和模型分析。针对UML和Petri网建模的特点 ,本文提出了基于UML和Petri网———UML PNs的集成建模方法 ,给出了集成建模策略 ,并结合一个示例 ,绘制了对象类图、交互图和行为图 ,最后将其映射成Petri网模型 ,进行模型的分析工作 ,为可集成制造执行系统的设计和开发建立了良好的基础     

Stability problem formulation of structurally compliant robot manipulators during contact task execution: A singular perturbation approach

Aspects of modelling, stability and control of robotic manipulators with structurally compliant links and joints during contact with a stiff work environment are presented in this paper. System models of n joint robotic manipulators are cast into multiple time-scale formulations. Several different models are developed, based on the relative differences in magnitude of the scaling parameters associated with the manipulator link, joint and environment stiffnesses. These stiffnesses, if greatly different, lead to a four time-scale system with virtually no interaction between these subsystems. In these models, as various subsystem stiffness coefficients become approximately equal, strong interaction among the subsystems is seen. Utilizing the theory of singularly perturbed dynamic systems, aspects of overall system stability are touched on, and possible use of a high speed stabilizing control is considered. It is seen from the analysis presented, that depending on the relative structural stiffness of the link, joint and work environment, is is not always possible to apply a corrective control for certain structural compliance effects. An example serves to illustrate some of the concepts discussed in the paper.

It is noted that this paper does not provide general stability conclusions, but rather forms a framework for stability investigation.     

Design and manufacturing interface modelling for manufacturing processes selection and knowledge synthesis in design

The research results presented in this paper are related to the specification of a method and models that tackle the problem of manufacturing processes selection and the integration, as soon as possible, of their constraints in the product modelling (i.e. information synthesis). This method is based on a skin and skeleton design/manufacturing interface model that ensures connection between design and manufacturing information. The use of these features is justified by their capacity to make a product representation which allows integration of both design and manufacture data and therefore assists the product breakdown definition (including the 3D forms) by least commitment. This method first analyses the product data issued from functional analysis and component selection (form, roughness, tolerance interval, etc.). Then, it deals with manufacturing information (manufacturing processes constraints). The approach is formalised with IDEF and UML models and has been consolidated with software developments based on C++ and open CASCADE technologies.     

基于IDEF与UML的系统建模方法

通过分析IDEF与UML建模方法的优缺点，提出一种两者结合的系统建模方法，即用IDEF0模型进行系统需求分析，用IDEF1x模型指导关系型数据库系统的建立，用UML模型进行面向对象的软件系统设计。采用该方法设计了某大型机床厂的车间生产计划与调度系统模型，根据该模型开发的基于组件的生产计划与调度系统具有良好的可配置性、可扩展性和可重用性，已用于对两种不同类型车间的生产管理，证明了该方法的优越性。     

水平定向钻虚拟样机建模与仿真

为了全面分析水平定向钻的性能，针对不同领域，分别建立了机械、液压、强度和控制等子系统模型，通过参数关联形成了一个完整一致的水平定向钻整机虚拟样机模型。通过对模型的机械系统动力学性能、液压系统管路压力与流量以覆关键部件的应力和应变仿真分析，为实际产品设计与优化提供了理论依据。     

基于CAD/CAM集成的特征系统研究

详细讨论了自行开发的基于CAD/CAM 集成的特征系统,介绍了该系统的体系结构及基于特征的零件信息描述方法,并给出了在Solid Edge 系统基础上开发的特征造型与特征识别系统的功能及其实现过程。     

飞行模拟器操纵负荷系统的数学建模及仿真研究

对飞行模拟器操纵负荷系统进行数学建模,为适应不同模拟对象和不同工作模式杆力特性变化要求,提出了三段式跟踪力模型。分析了驾驶员操纵产生的位移扰动对电液伺服施力机构的影响,找出了提高跟踪性能的关键因素——多余力和稳态误差。通过采用结构不变性原理及PID控制来实现力的逐点跟踪。仿真结果表明,利用三段式跟踪力模型,并且采用前馈校正策略加PID控制,可实现动态模拟,并且有效地减小多余力,控制稳态误差,达到力跟踪精度性能的要求,为构建操纵负荷系统原理样机提供了数据参数和控制策略的依据。     

Petri net-based workflow modelling and analysis of the integrated manufacturing business processes

The well-behaved properties in workflow systems are very important for business processes. In this paper, a structured business process modelling approach by using free-choice Petri nets and workflow analysis techniques is proposed. This approach can be used to verify the soundness of workflow process specification for finding control-flow errors in the designs. For example, deadlock and dangling tasks in process models can be avoided by using this approach. However, for arbitrary Petri nets, the checking of sound properties is a NP-hard problem. This paper presents a structured business process modelling algorithm. This algorithm employs six well-behaved control structures, chaining rule and modified nesting rule to construct well-behaved process models. The resulting process models from this algorithm are free-choice workflow-nets, for which sound property can be decided in polynomial time. The proposed method is an extension of the workflow-net. The basic transformation rules in the workflow-net are subsets of the proposed nesting rule in this paper. The process models resulted from this structured business process modelling algorithm also have the advantages of modularity, readability and maintainability.     

基于UML建模的喷涂机器人控制系统的设计

为了提高喷涂机器人控制系统的可靠性和可维护性，提出了一种针对喷涂机器人控制系统的分析与建模方法。建模过程分为三个步骤：首先应用UML用例图，对啧涂机器人控制系统进行描述；然后应用UML类图建立喷涂机器人控制系统各部分的静态模型；最后通过分析系统工作流程，得出喷涂机器人控制系统的动态模型，在喷涂机器人控制系统软件开发过程中验证了该建模方法的可行性。     

Throughput-driven condition-based maintenance for frequently reconfigured mass production equipment

Heavily utilised reconfigurable production equipment has uneven deterioration rate caused by frequently changing configurations and complex subsystem interaction. Thus, traditional maintenance approaches that rely on reliability modelling are ineffective when applied on this class of equipment. This paper introduces a throughput-driven condition-based maintenance framework intended to perform predictive maintenance for heavily utilised reconfigurable production equipments. The effectiveness of the proposed method is experimentally validated using actual production records of the semiconductor test handlers. The primary benefit of the proposed framework is its prediction efficacy while accounting for the complex subsystem interaction through Bayesian statistics. It is low cost to implement because it only uses existing resources already available in most manufacturing plants.     

基于CORFU FBDK的工件热处理控制系统设计

IEC 61499是一个新兴的用于分布式控制系统的国际标准,功能块是该标准的核心思想.对IEC 61499标准进行了研究,引入了CORFU FBDK工具并研究了该工具的应用方珐.研究了UML模型与功能块模型的关系.针对一个工件热处理控制系统,设计了该控制系统的UML模型和功能块模型,说明了一种将UML建模方珐与功能块概念相结合的分布式控制系统设计方法.