基于STEP应用协议开发方法的产品建模与实现

分析了集成信息CAD系统中要解决的产品模型信息描述问题,基于STEP标准和IEDEF产品建模方法,提出了基于功能层的产品信息建模和产品信息模型的三层结构：功能层、广义零件层和广义结构层,以工程中业已标准化的滚动轴承为对象,建立了基于STEP标准的产品功能信息EXPRESS描述模型,提出了信息模组织、传递和实现的原型框架,为集成信息CAD系统的信息集成中性环境的建立与实现提供了基础。     

面向对象的数据建模方法体系的研究

探讨建立面向对象的数据库方法体系 ,分析了数据技术从关系数据向面向对象的数据库方向发展的趋势 ,介绍了面向对象的数据库技术的特征。以 STEP/EXPRESS为建模工具 ,对汽车总体到变速箱中的基本零件 ,齿轮和轴的数据建模为例 ,探讨面向对象数据建模的机制 ,以及与 Visual C+ + 的衔接和数据对象管理 ,以表明该方法体系对建立复杂系统的数据库结构框架的思路和实用性     

STEP数据模型在关系数据库SQL Server上的映射

数据库实现是当前STEP数据模型实现数据交换的较优方法。研究STEP数据模型在关系数据库SQL Server上的映射,介绍数据字典的建立,详细阐述EXPRESS数据模式向SQL Server 2000转换的规则和方法,并给出一个具体的应用实例。结果表明,在关系数据库SQL Server上实现STEP数据模型的映射是可行的。     

CAD协同设计中通信消息的分析与实现

分析了消息在协同设计系统中的结构、路由、处理、表达和实现以及冲突机制,并提出了一些CAD协同设计系统中关于消息的通信问题的解决方法     

国内快讯

热灌装瓶盖专用料———HDPE试产成功近日,由兰州化工研究中心橡胶加工应用研究所开发热灌装瓶盖专用料HDPE-L5202试生产成功。检验结果表明,产品的各项技术指标均达到进口同类产品水平。该产品的试生产成功,为进一步提高兰州石化公司的经济效益打下了基础。我国对热灌装瓶盖专     

Mobile database nodes for manufacturing information management: a STEP based approach

This paper describes research currently being carried out in the area of information management architectures for flexible manufacturing systems (FMS). This work originates from the idea that process control may be achieved by machines as in the standard approach but also by all the products carrying their own information. So, distribution of the information system onto each individual product requires tools and methods to manage and to provide access to product information for both automated systems and human operators. Automatic identification technologies using electronic data carriers can provide such functions and act as product information vectors. Our approach is based on the STEP technology to define computer-aided tools for data acquisition and management of product-related information implemented on mobile database nodes circulating in a CIM environment.     

Object-oriented DBMS requirements

The requirements on an object-oriented DBMS for management of information in a large, complex enterprise are presented. These requirements aid in the achievement of an environment characterized by data sharing, open architectures, application and data portability, and assurance of data integrity. They were defined from the point of view of a user of the DBMS; therefore they describe the expected functionality of the DBMS and do not specify the method of implementation to achieve this functionality. They encompass requirements on the data model, query and data manipulation languages, the system architecure, interfaces to the system, change management, and transaction management.     

面向对象数据模型建模方法研究及在大规模数据平台中的应用

“石油勘探开发应用软件工程化与集成”项目是中国石油天然气集团公司”九五”攻关项目 ,整个项目的核心是要创建一个统一的数据平台 .作者在项目的研究过程中 ,对面向对象建模技术进行了详细的研究 ,并对建模中涉及到的一些元模型进行了定义 ,包括模式定义、实体定义、属性定义、各种规则的定义等 .依据这些定义并结合石油勘探与开发工业的应用需求进行了统一建模 ,并利用 EXPRESS对模型进行描述 .本文以石油勘探与开发工业中的文档管理模型的建模为例 ,论述了这些技术在石油勘探与开发大规模数据平台中的实际中应用     

Seeking intelligent product development—an integrator environment based on STEP

Rapid Prototyping (RP) is an emerging technology with different applications in the cycle of product and process development used during the conceptual and specification phases. To support it, the usage of a Data Base Management System (DBMS) and an Expert Systems (ES) are important to manage the data, support the identification of errors and check product conformance and production viability during this cycle, seeking intelligent product development. The underlying concept of RP and ES is very straight forward, but still exists a major problem that concerns the integration in the CAD/CAM environment. CAD data can have a variety of formats depending on the model used in the CAD system, as well as on ES' data and knowledge structure, that usually relies on the expert system shell's where it was developed. To support and speed up the integration process of these tools in a manufacturing environment, is essential to have an integrator environment where a standard is adopted for the data and knowledge exchange process, providing the software applications with a neutral format interface, becoming these tools open and standard compliant, ready to be used in any other standard environment. UNINOVA, in the scope of European and National projects, developed a STEP-based Platform for Integration of applications (SIP) to support and aid the software integration in industrial environments using the standard ISO10303-STEP, already used in different industrial domains. This paper addresses the integration aspects using STEP within industrial environments from the technical point of view, and proposes an architecture and a toolkit for the integrator environment, highlighting the implementation efforts required to have RP technology, ES and DBMS focused towards a STEP-based intelligent product development.