基于STEP与XML的虚拟企业制造信息共享及信息安全研究

在对虚拟企业制造信息的集成框架进行分析的基础上，本文研究了基于XML与STEP如何实现虚拟企业制造信息共享及信息安全问题，讨论了从STEP到XML的转换和XML安全技术。最后，举例说明了虚拟企业制造信息集成的实现。     

基于XML的STEP产品数据网上描述与识别

为了实现STEP的XML表达，以STEP Part21物理文件为研究对象，首先分析了EXPRESS与XML语言并建立匹配关系；然后建立基于数据实例层次结构树的XML DTD以实现通用的、统一的XML表达；最后结合原型系统SX－Viewer的实现过程和结果证明其可行性和实用性。     

XML及STEP标准在流程工业信息集成中的应用研究

流程工业中数据结构复杂，数据之间关系多种多样，如何对这些数据实现标准化处理是一件很困难的事。以前人们采用的方法多为各种零散的方法，或者是借助于制造行业发展起来的STEP来实现，但是STEP主要是用在表述结构化数据的，而对于非结构化数据以及半结构化数据的描述存在很大困难。因此，文中提出用XML来表述流程工业的非结构化数据和半结构化数据，采用XML与STEP标准结合的方式，实现对流程工业数据的集中处理，以便让那些建立在其上的其他信息处理过程中应用。文末给出了XML与STEP相结合所描述的一个典型过程工业信息集成应用案例。     

基于XML的STEP数据安全机制的研究

为了实现STEP格式的数据在网络上发布,引入了XML技术和密码技术。首先,建立了STEP与XML之间的一一映射关系,将STEP数据转换为XML文档,然后研究了XML文档的加密和签名机制,并给出了具体的应用实例。     

基于云计算的协同设计理论及其关键技术研究

分析了目前产品分布式协同设计的主要方式,提出产品协同云设计概念。对基于云计算的产品协同设计理论进行研究,对理论涉及到的云计算、语义网、智能匹配选择算法和STEP和XML技术等共性关键技术进行研究。     

产品模型数据交换标准STEP研究

在设计和制造中,许多系统过去常常要处理技术产品数据.每个系统有它自己的数据格式,所以相同的信息必然在多个系统中多次存储,这会导致了信息的冗余和错误.STEP是一个广泛使用的ISO标准(ISO 10303),描述了表示和交换数字产品信息的方式.研究了STEP的标准体系结构,并研究不同应用对象的STEP和STEP未来的发展趋势.     

基于STEP和OSG的虚拟装配系统

针对传统虚拟装配系统中装配灵活性不足以及模型格式的局限造成的问题,对工业CAD设计中STEP标准进行了研究,并结合开源虚拟现实引擎OSG (OpenSceneGraph)的技术特点,设计出一个虚拟装配系统,并解决了其中关键技术问题,仿真出一个原型系统.系统采用OSG组织STEP产品模型的拓扑结构,并采用NURBS曲线曲面方法表达STEP模型的几何形状信息,将STEP模型读入系统,根据模型特征面、线之间的配合关系实现装配.系统的实现不仅增强了装配的灵活性,还使工业CAD与虚拟现实系统无缝结合、数据双向通信,同时也扩展了OSG的应用范围,从单纯的图形渲染走向虚拟装配制造领域.为虚拟装配设计、教学培训提供了方便有效地支持.     

基于XML的STEP-NC程序解释器的设计与实现

通过分析STEP-NC数据模型及程序结构,指出ISO10303 Part21物理文件格式数控程序不适合在网络上传输的缺点.因而在对现有数控系统进行基于STEP-NC的改造时,采用XML作为STEP-NC数控程序的文件格式,并提出面向网络化制造STEP-NC数控系统的基本框架,阐述了各组成模块的功能.同时从教据存储结构、解析XML、信息提取方法三个方面重点介绍基于XML的STEP-NC程序解释器的设计.最后采用JAVA语言实现了该解释器的功能,并通过STEP.NC标准草案里的一个实例验证该设计的正确性.     

IIE环境下一种基于STEP的产品信息组织方法

针对IIE环境下产品信息共享与集成的特点,提出了一种基于STEP的产品信息组织方法。通过基于STEP的产品结构信息建模,以产品结构树为骨架,实现了面向产品全生命周期的产品信息管理模式,为研制基于Web的CAx系统、PDM系统及实施协同设计、敏捷制造等先进生产模式提供了理论和技术基础。     

网络化制造关键技术信息流的研究

动态联盟各盟员间信息的集成与共享是实现网络化制造的基础和核心,针对分布、异构、异质网络化制造环境的特点,该文提出实现网络化制造信息集成与共享的总体解决方案:基于STEP标准信息的表达和产品的建模;基于XML、VRML信息的传输;基于ASP技术信息的存取;基于CORBA规范信息系统的集成和软件的互操作性。最终实现信息流在分布、异构、异质网络化制造环境中高效的传输,动态联盟各盟员间信息的实时共享。     

A collaborative and integrated platform to support distributed manufacturing system using a service-oriented approach based on cloud computing paradigm

Today's manufacturing enterprises struggle to adopt cost-effective manufacturing systems. Overview of the recent manufacturing enterprises shows that successful global manufacturing enterprises have distributed their manufacturing capabilities over the globe. The successes of global manufacturing enterprises depend upon the entire worldwide integration of their product development processes and manufacturing operations that are distributed over the globe. Distributed manufacturing agents' collaboration and manufacturing data integrity play a major role in global manufacturing enterprises' success. There are number of works, conducted to enable the distributed manufacturing agents to collaborate with each other. To achieve the manufacturing data integrity through manufacturing processes, numbers of solutions have been proposed which one of the successful solutions is to use ISO 10303 (STEP) standard. However, adopting this standard one can recognize antonym effects of integration and collaboration approaches that weaken both integration and collaboration capabilities of manufacturing agents. In our latest work, we had developed an integrated and collaborative manufacturing platform named LAYMOD. Albeit the platform in question was through enough to be applied in various collaborative and integrated CAx systems, its embedded structure hampers its application for collaboration in distributed manufacturing systems. To achieve an integrated and collaborative platform for distributed manufacturing agents, this paper proposes a service-oriented approach. This approach is originated from cloud computing paradigm known as one of the technologies which enables a major transformation in manufacturing industry. Also, to maintain the product data integration based on the STEP standard, a new service-oriented approach is proposed. This approach is in parallel to the new capability of the STEP standard for supporting XML data structures. The result is a new platform named XMLAYMOD. XMLAYMOD is able to support distributed manufacturing collaboration and data integration based on the STEP standard. The different aspects of this platform to fulfill the requirements of distributed collaboration and also to overcome the lacks of the STEP standard are discussed through a brief case study.     

虚拟企业中的信息集成技术

研究了利用Ｉｎｔｅｒｎｅｔ和分布对象等相关技术实现在虚拟企业中集成制造信息,这种集成涉及网络通信、产品建模和软件互操作方面的国际标准：Ｉｎｔｅｒｎｅｔ和ＷＷＷ、ＳＴＥＰ、ＣＯＲＢＡ,三种技术的综合应用为面向Ｉｎｔｅｒｎｅｔ的制造信息集成和制造软件互操作提供了基础,成为成立虚拟企业的基本技术条件。     

XML-based data processing in network supported collaborative design

In the course of network supported collaborative design, the data processing plays a very vital role. Much effort has been spent in this area, and many kinds of approaches have been proposed. Based on the correlative materials, this paper presents extensible markup language(XML)based strategy for several important problems of data processing in network supported collaborative design, such as the representation of standard for the exchange of product model data(STEP)with XML in the product information expression and the management of XML documents using relational database. The paper gives a detailed exposition on how to clarify the mapping between XML structure and the relationship database structure and how XML-QL queries can be translated into structured query language(SQL) queries. Finally, the structure of data processing system based on XML is presented.     

The emerging STEP standard for product-model data exchange

The International Organization for Standardization's (ISO's) standard for the exchange of product-model data (STEP) is discussed. The goal of this standard, officially named ISO 10303, is to facilitate the computer-readable exchange of the total information used to define an industrial product. As a standard method for digital product definition. STEP will support communications among heterogeneous computer environments. The standard will make it easier to integrate systems that perform various product life-cycle functions, such as design, manufacturing, and logistics support, and will help facilitate concurrent engineering. The current electronic domain standards are reviewed. The ways in which STEP differs from them are outlined     

GHCAD：一个产品模型为基础的CAD／CAM集成系统

ＳＴＥＰ是关于产品数据表达和交换的国际标准，如何将ＳＴＥＰ的方法和规范应用于系统开发是解决计算机集成制造系统（ＣＩＭＳ）开发的关键问题之一。集成化ＣＡＤ／ＣＡＭ系统是ＣＩＭＳ的核心，实现将ＣＡＤ的工程设计功能和ＣＡＭ的制造功能的结合。本文介绍一个产品模型为基础的ＣＡＤ／ＣＡＭ集成系统－ＧＨＣＡＤ。系统采用ＳＴＥＰ的数据交换、建模思想，以产品模型为核心，通过ＳＴＥＰ的标准数据接口ＳＤＡＩ实现了系统的集成。     

基于STEP标准的统一BOM模型研究

在产品生命周期中,BOM贯穿了设计、工艺、制造、计划、采购、销售、财务等几乎所有职能部门,各部门按照本部门的需要定制了各种BOM。在BOM的定制过程中往往没有统一的设计和管理规范,无法保证各BOM之间数据的一致性,这种现象严重影响了企业产品设计、生产和管理等过程的集成和效率,增加了产品生产成本、延长了产品开发周期,所以研究基于STEP标准的统一BOM模型对制造业信息化的进程具有十分重要的意义。文中首先剖析了企业中存在的多视图BOM,阐述了BOM多视图的演变过程,在此基础上提出了统一BOM模型,并基于STEP标准构建了统一BOM模型。实践证明,文中提出的基于STEP标准的统一BOM模型可以较好地解决多视图BOM的模型不统一问题。