基于SDAI的STEP应用协议的信息提取与建模

STEP是关于产品生命周期中数据表达和交换的国际标准。SDAI是STEP采用的标准数据访问接口,是针对不同的数据存贮技术而提供的统一的数据存取接口标准。该文论述了STEP/SDAI标准及其语言联编概念,并通过一个采用SDAI的C++早联编技术的建模软件的开发过程展示了基于SDAI的STEP应用协议的信息提取及建模。     

基于STEP/AP209的有限元后处理技术研究

STEP是关于产品生命周期中数据表达和交换的国际标准。SDAI是STEP采用的标准数据存取接口,是针对不同的数据存贮技术而提供的统一的数据存取接口标准。文章通过SDAI标准数据存取接口,来实现有限元分析本体程序和后处理系统之间的数据交换,在此基础上实现了STEP/AP209格式文件的读入,并对有限元后处理技术进行了研究。     

CAD智能工程数据库实现方法的研究与应用

在引入了STEP标准之后,各CAD系统用户之间信息共享和信息集成效率大大提高,这对CAD用户系统的开发设计、制造、销售都起到了极大的推动作用。论文主要针对引入STEP后,系统的实现方法作了较为深入的分析,同时提出了利用数据库实现方法较新的技术解决方案,并给出了具体的应用实例。     

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     

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.     

Mapping 2D midship drawings into a 3D ship hull model based on STEP AP218

Standard for the exchange of product model data (STEP) AP218 has a standard schema to represent the structural model of a midship section. While its schema facilitate the exchange of ship structural models among heterogeneous systems, most shipyards and classification societies exchange information using 2D paper drawings. We propose a feature parameter input method to generate a 3D STEP model of a ship structure from 2D drawings. We have analyzed the ship structure information contained in 2D drawings and have defined a data model to express the contents of the drawing. We also developed a GUI for the feature parameter input. To translate 2D information extracted from the drawing into a STEP AP218 model, we have developed a shape generation library and have generated the 3D ship model through this library. The generated 3D STEP model of a ship structure can be used to exchange information between design departments in a shipyard as well as between classification societies and shipyards.     

一个开放可扩展的SDAI实现系统

STEP标准数据存取界面－SDAI为应用程序提供了独立于数据存储的STEP数据访问界面，SDAI允许访问不同的数据存储系统，有不同的实现语言联编方式，如果对每一种实用语言和数据存储系统单独实现SDAI，其工作量将是巨大的，该文选择系数据库作为SDAI数据存储系统，C语言作为实现语言，实现系统独立于不同的关系数据库系统，并且为不同语言的联编提供了一个统一的开发平台，提高了系统的开放性和可扩展性，为STEP在企业信息集成中的应用提供了核心操作，STEP建模语言EXPRESS，关系数据库，SDAI实现语言在模式表示上的不匹配是系统实现要解决的主要问题，该文从数据字典，STEP数据的字储与访问等方面阐明了系统实现时没模式之间的匹配过程。     

基于XML的产品信息模型网络转换技术研究

针对当前网络化设计和制造中存在的异构问题,分析了将XML语言和STEP标准结合来表达产品和发布产品数据的技术方法,并基于对STEP物理文件的数据分析,设计出XML与STEP格式文档相互转化的转化器,并结合弹丸制造例子给以说明。     

Concurrent engineering with delta files

We describe a test system in which we used a data management system and delta files to communicate engineering changes between two modeling systems: an ACIS-based solid modeling system running on a Sun Sparc workstation to create a part, and a CATIA system running on an IBM RS/6000 to design a fixture for it. The test system communicates the first version of the MBB part between the two engineers as a PDES/STEP (Product Data Exchange Standard/Standard for the Exchange of Product-Model Data) exchange file. The ACIS engineer then makes an engineering change to the part, thus creating, the second version (V2) of it, and a delta file communicates the V2 changes to the CATIA engineer. The CATIA engineer can use this delta file to highlight the changes to the part between the two versions. Although our test system/scenario is simple, it demonstrates the advantages of delta files. It also helped us identify several important issues for developing the method further. We first outline the STEP standard and how we used it to implement data exchange in our test system, then we discuss delta files and describe how we implemented them. We conclude with a discussion of the lessons learned from the test system and scenario     

Enriching standards-based digital thread by fusing as-designed and as-inspected data using knowledge graphs

Realizing the digital thread is essential for linking and orchestrating data across the product lifecycle in smart manufacturing. Linking heterogeneous lifecycle data is critical to maintain associativity and traceability in a digital thread. Recently, researchers have successfully leveraged ontology models with knowledge graphs in engineering domains for threading different lifecycle data. One of the most successful of such efforts is OntoSTEP which enables the formal capture of information embedded in the STandard for Exchange of Product model data (STEP) data representation, or ISO 10303. Meanwhile, an emerging inspection standard, called the Quality Information Framework (QIF), has garnered significant attention as it can bring quality information into the digital thread. Implementing more automated methods for product quality assurance is challenging due to the lack of unified information models from design to inspection. To this end, we propose an approach to fuse as-designed data represented in STEP and as-inspected data represented in QIF in a standards-based digital thread based on ontology with knowledge graphs. Specifically, we present an automated pipeline for generating knowledge graphs representing STEP and QIF data, a mapping implementation to integrate STEP and QIF knowledge graphs, and rules and queries to demonstrate the integration’s potential for better decision making with respect to product quality assurance.     

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。     

关系数据库上SDAI实现的研究

ＳＤＡＩ是ＳＴＥＰ的数据接口规范，它为工程应用与ＥＸＰＲＥＳＳ描述的数据模型间定义了一个功能界面。本文讨论了关系数据库上ＳＤＡＩ实现的方法，阐述了ＳＴＥＰ模型与关系模型的一种转换机制，开发了关系数据库上数据交换ＳＤＡＩ接口函数库，为ＳＴＥＰ的工程应用奠定了基础     

STEP信息集成软件工具的设计和实现

ＳＴＥＰ是国际标准化组织ＩＳＯ正在组织开发的应用于计算机集成制造系统（ＣＩＭＳ）信息集成的产品数据表达与交换标准，ＳＴＥＰ不仅是一种规范，更是一种信息集成技术，本文以ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统集成为背景，提出了ＳＴＥＰ信息集成支持工具ＥｘＴｒａ的设计和实现技术，该软件工具已成功且有效地应用于ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统集成中。     

A database system of mechanical components based on geometric and topological similarity. Part I: representation

A database of mechanical components is an important issue for some manufacturing activities such as cost estimation, process planning, and design by case-based reasoning. In this paper, we give the representation scheme of the CAD model in such a database. Components are represented using attributed graphs in which the nodes correspond to the surfaces of the component and the links correspond to the edges of the component. The graph is based on the standard for the exchange of product information (STEP) physical file of the component. STEP file should be unique for a single component regardless of the underlying CAD system. The process of creating the graph of a component constitutes two sub-tasks: (i) importing the CAD model from the CAD system in STEP format and (ii) transforming the STEP data into attributed graph-based representation. The graph and its attributes describe the topology of the component completely together with some geometric data that are not dependent on any coordinate system such as surface type and curve type. These geometric data are helpful in the retrieval and matching processes in the database.     

基于STEP的特征模型及重构算法

随着CAX技术的发展,特征技术得到越来越多的重视,特征技术的使用,大幅度提高了产品的设计、制造、集成等过程的效率。目前,基于特征的CAD、CAM系统是市场的主流,CAPP是完全基于特征的应用系统。但是在STEP的众多应用协议中,涉及机械设计、制造、管理的应用协议有很多,但是这些应用协议基本上没有提供对特征的支持。AP224是较早支持特征的STEP应用协议,主     

基于STEP的产品质量信息建模与共享技术

计算机集成制造(CIM)技术研究的难点之一是信息的集成。从技术发展看,CIM信息的集成两个层次,其一是(:IM系统中各“孤岛”之间信息的自动转换,其二是基于并行工程思想的信息共。由于历史原因,CAD、CAPP、IQS、CAM系统各自独立发     

Pro/E和UG之间三维模型数据交换方法

为了实现CAD系统（Pro/E）和CAM系统（UG）之间三维实体模型数据交换,以卫星零部件为对象,根据系统之间数据交换的机制,在分别研究了IGES标准和STEP标准的基础上,基于这2种标准进行了数据交换实验比较,提出了基于STEP标准实现Pro/E和UG之间实体模型数据交换的方法.     

基于STEP标准的数据交换的研究与实现

文中概述了产品数据表达与交换标准化的发展过程,着重分析了基于STEP产品数据交换接口的设计,为自行研制的可视化系统实现了基于STEP中性文件的数据交换接口,将复杂形体的几何徒刑数据读入并在可视化系统内实现四面体剖分,在复杂数据场的分析和显示方面具有重要的应用价值。