基于Web的液压系统协同设计系统的研究

综述了协同设计技术的发展,阐述了开展液压系统协同设计的必要性,提出了基于Web的液压系统协同设计系统的体系结构和实现方法,讨论了实现液压系统协同设计的关键技术.     

注塑件协同设计的实践

以某公司的数码相机开发为实例,详细研究采用协同设计模式开发产品的结构、流程及关键技术。     

基于Internet的异地合作设计系统研究

介绍了基于Internet的异地合作设计系统的技术背景。分析了异地合作设计系统的结构特点和工作流程 ,实现了一个异地合作设计系统MRCDS ,并对它进行了初步的验证     

Using a knowledge-based intelligent system to support dynamic design reasoning for a collaborative design community

Traditional computer-aided design (CAD) and product lifecycle management (PLM) tools have their limitations in supporting quick-to-market, mass-customized product development environments. The present paper proposes a general integrated framework of design knowledge representation and develops a knowledge-based intelligent system (KBIS) to facilitate dynamic design reasoning. Owing to the increasing complexity of product design, the traditional design (knowledge) rules can no longer help facilitate complex product development, which requires flexible design knowledge adoption and collaborators’ interaction during design inference processes. Therefore, this research enhances the abilities of smart collaborative design reasoning. A conceptual architecture for the KBIS is presented to enable a collaborative design community to reason feasible design parameters and to integrate all sub-system designs of a product. Finally, a case study of designing an air compressor and its sub-system (V-type belt) is presented to demonstrate the unique features of the KBIS.     

基于网络的协同设计系统开发

分析协同设计系统的发展背景、研究现状和特点,提出基于网络的协同设计系统的体系结构,在此基础上,开发了一个基于J2EE和CORBA技术的协同设计原型系统。论述该原型系统的主要功能、系统框架和网络结构。最后以减速器为例,给出了系统的运行情况。     

Geometry-oriented knowledge-based system for preliminary process design of cold-forged parts

This paper presents an integrated architecture of a geometry-oriented knowledge-based process-design system (GEOPDE) for multistage cold forging of solid and hollow parts. It deals with the unit processes of upsetting, forward extrusion, backward extrusion and with combinations of these processes. By using the notion of group technology, the forging processes and forging part geometries are classified. With Prolog as the building tool, the inherited backward chaining reasoning was used for solving the deduction problems. The formation approach, such as “generate and test” and backtracking control strategy, was also employed for generating weighted alternative process plans. Using design rules, empirical formulae and material properties as integrated knowledge, the billet dimensions and the forging sequences are generated automatically once the product dimensions are given by the user. The developed system is a prototype expert system for the preliminary process design of cold-forged products for the forging industry.     

Conceptual design support system in a collaborative environment for injection moulding

The shortened time-to-market of new products requires experts from multiple disciplines to cooperate in product development. In this collaborative product development environment, an Internet-based conceptual design support system for Injection moulding is developed. It can help designers to put forward feasible design solutions quickly and provide strong support for collaborative design. The architecture, implementation and evaluation of this system are discussed in this paper. The proposed system makes fully use of component-based web technology and has a flexible distributed architecture. A hybrid neural network and genetic algorithm approach is also adopted for more accurate and efficient retrieval. Experiment results indicate it is superior to conventional systems in accuracy and time.     

小型足球机器人车体系统的概念设计

提出了在机器人足球比赛环境下小型足球机器人车体系统的一种设计思路。即首先对足球机器人系统的性能要求作出分析，在此基础上对足球机器人系统的任务进行整合和分解，最后提出了机器人车体系统的结构模型。文中建立的小型足球机器人车体系统设计概念模型对于其他组别的足球机器人系统设计也有借鉴意义。     

基于Internet技术的DNC系统设计

随着互联网技术的迅速发展,互联网技术给传统产业带来了机遇和新的思路,运用现代先进信息技术对制造业自动化系统进行改造,使制造企业自动化系统的结构更为合理,同时使系统的控制和管理更为方便和高效。本文介绍了在互联网技术发展不同时期基于INTERNET技术设计的DNC系统的两个方案,并对两个方案进行了比较。最后,详细讨论了基于客户端结构的方案的DNC系统设计并描述了如何将DNC系统集成到车间控制系统中。     

A Distributive and Collaborative Concurrent Product Design System through the WWW/Internet

Concurrent engineering involves the integration of people, tools, information, and processes into a responsive and efficient system. This paper addresses a key requirement in distributed concurrent engineering, namely, the ability for geographically dispersed and disparate parties, having heterogeneous computing platforms, to exchange design and manufacturing data. The development of an effective and efficient collaborative product design support environment based on the WWW/Internet is presented. A new method that reduces the transmission time through the use of macro files is proposed to realise the real-time communication, together with a monitoring methodology for synchronising group operations, and maintaining consistency of shared CAD models in a cooperative design review (co-modifying) process. Based on the proposed methods, a software interface has been developed to extend the traditional single location CAD software system to a multi-location application for coordinated product design through the Internet. This software interface was coded in Java. The architecture is a connection-oriented client/server structure using TCP/IP protocol. Unigraphics on a UNIX Workstation and MicroStation on Windows NT have been successfully integrated. The findings of this paper allow product designers to exchange and share product data, communicate with team members, modify geometry data on particular aspects of the design, and maintain operations consistency in all the distributed cooperative sites on a wide variety of platforms.     

A design representation scheme for collaborative product development

Design is an integral component of product development, which includes manufacturing. In order to avoid costly reworks and delays, and to reduce the lead-time in product development, effective communication of design concepts among the various stakeholders such as customers, designers and engineers is of utmost importance. In this respect, functional representations provide a methodology, which can be used to describe a design or product effectively. However, function is not the only type of information that needs to be communicated among the various stakeholders during a design process. Other types of information such as design specifications and constraints, which are non-functional, also need to be taken into account. This non-functional information cannot be adequately expressed using existing functional representations. Accordingly, in this work, a novel purpose-behaviour-structure (PBS) representation scheme to capture vital design knowledge for collaborative product development is proposed. The proposed PBS representation scheme can be used by designers working in a collaborative environment for product development. A case study on the design of a vacuum cleaner is used to illustrate the functionality of the PBS representation scheme. The details of the representation scheme are presented in this paper.     

面对制造和面对装配的设计

介绍了基于降低成本和提高生产率的设计——面对制造的设计 (DFM)和面对装配的设计 (DFA) ,并提出了实施 DFM和 DFA技术的策略     

Automatic recognition of design and machining features from prismatic parts

Prismatic parts usually comprise basic features, such as slots, steps, holes, bosses, which may intersect with one another. In general, automatic recognition of intersecting features is difficult and may present bottlenecks when automating the design procedures which make use of features for downstream operations.This paper presents a novel approach to recognising intersecting features and auxiliary features due to tool movements and cutter radii. Since no cutting edges can be perfectly sharp, corner fillets on machined features are invariably created by end mills and other cutters. Fillets, on the other hand, could very well be features which have been designed to increase strength and reduce stress concentration of certain features. A feature recognition system is proposed to recognise features having fillets which may be either design or manufacturing features. This information will be useful to the product designer as it would be possible to distinguish between the intended and unintended features of a part. The developed system has been implemented on an HP-ME30 Solid Modeler.     

Design for economic manufacture of small sheet metal parts

Arguments are presented for a consideration of the DEM of pressed parts on a basis of equipment and tooling used to produce the parts rather than consider a categorisation based on ‘type’ by industry. It is also suggested that a combination of both generative and variant techniques of process planning, in conjunction with a good classification system and data base, should be used by the designer to develop, store and retrieve the type of information used in cost-optimising the design of pressed parts. This paper outlines the elements of cost involved in the production of pressed parts and presents details of a computer-aided process planning system which will assist the designer to quickly obtain the information necessary to optimise the designs. Typical computer program inputs and outputs are presented together with rules that have emerged in pressing design to reduce the number of tooling stages required and therefore the component manufacturing cost.     

A CAD/CAM system for die design and manufacture

The manufacture of directionally solidified cast turbine blades relies on the precise casting of wax patterns of the actual turbine blade. This, in turn, requires the design and manufacture of a complex die. A CAD/CAM system is presented specifically for producing manufacturing information for dies based on basic data defining the shape of a turbine blade. The system is based around a UNIX graphics workstation which forms part of a CIM system being developed as part of an SERC Teaching Company based at Rolls-Royce plc, Derby.     

基于设计制造资源共享的圆柱齿轮设计绘图系统的开发与研究

本文结合基于设计制造资源共享的圆柱齿轮设计绘图系统开发实例,详细讨论了基于Web的设计制造资源共享实现技术。规划设计了基于设计制造资源共享的圆柱齿轮设计绘图系统的功能模块,探讨了组件的注册及其在网页中的调用方法,实现了基于网络的设计制造资源共享。     

产品设计任务分解流程及其相干性判定模型

实行分散协调型设计方法是现代市场竞争中缩短大型产品设计周期的重要手段;分析了大型机电产品设计任务分解原则;讨论了一般大型机电产品设计任务分解的通用流程模型并构建了一种判断子系统相关性大小的加权系数法;最后以现代船舶设计为例,阐述了分散协调型设计方法在实际产品中的应用。     

网络化机械零部件设计系统开发

研究网络化机械零、部件设计系统的开发过程,包括:构建基于B/S模式的体系结构、ASP网络程序技术、零、部件设计参数的远程提交、UG软件的二次开发以及COM组件编写等,并以齿轮设计为例说明机械零、部件网络化的设计过程.     

复杂机电系统耦合与解耦设计--现代机电系统设计理论的探讨

针对现代大型复杂机电系统的性能与运行状态多物理过程和多参数全局耦合结果的实,提出了对复杂机电系统进行全局耦合分析及合并行设计的基本思想,探讨了全局耦合分析与设计的基本理论框架,以其研究复杂机电系统功能,奇异工况的生成机制,实现,复杂机电系统的全局耦合最优设计。     

基于Internet的三维模型协同浏览与批注系统

随着越来越多的跨国公司的出现和社会分工日益向国际化方向发展 ,企业的合作伙伴甚至同一企业的各个部门往往在地域上非常分散。这就给设计过程中设计人员间的交流造成了障碍。产品的三维模型、二维图纸和相关文档是设计人员间交流的重要载体 ,其中基于三维模型的协同交流在现代设计中尤为重要。本文实现了一个基于 Internet的三维模型协同浏览与批注系统 ,为异地、异构环境下设计信息的协同交流及冲突协商提供了一种有效的工具