3.A Web-Based Remote Cooperative Design for Spati1.docx
《3.A Web-Based Remote Cooperative Design for Spati1.docx》由会员分享,可在线阅读,更多相关《3.A Web-Based Remote Cooperative Design for Spati1.docx(7页珍藏版)》请在得力文库 - 分享文档赚钱的网站上搜索。
1、Int J Adv Manuf Technol (2002) 20:557563 Ownership and Copyright 2002 Springer-Verlag London Limited A Web-Based Remote Cooperative Design for Spatial Cam Mechanisms G. F. Yin1, G. Y. Tian2 and D. Taylor2 1School of Manufacturing Science and Engineering, Sichuan University, PR China; and 2School of
2、Engineering, University of Huddersfield, Huddersfield, UK Proliferation of the Internet has provided a great opportunity to exploit the advantages of distributed design and manufactur- ing. This paper presents an approach to component-based distributed cooperative design over the Internet where an e
3、xtended multi-tier model (Browser/Server) is used to implement the web-based remote design system. As a case study, the system has been used to design spatial cam mech- anisms based on mathematical models. Some experimental results are reported in order to illustrate the flexibility of the approach
4、and the capabilities of the system. Keywords: Collaborative design; Distributed system; Extended multitier mode; Parametric spatial cam design; Web technology 1. Introduction Generally, a cam whose contour line/surface is a spatial curved line/surface is defined as a spatial cam. The cam mechanism c
5、omprises a cam with a profile defined by a complex curved surface and a follower. Calculation of the contour curved surfaces of the cam through the movement rules of the follower is complicated. In conventional design methodologies, a cylin- drical cam surface is unfolded onto a rectangular plane an
6、d a conical cam surface is unfolded onto a sector plane. Then the coordinates of the unfolded contour curved lines are obtained from the profile of the plane cam. When the follower is an oscillating part, the motion track of the centre of the roller, in relation to the spatial cam, is derived from a
7、n unfolded rec- tangle or a sector plane and is therefore only approximate. A condition of this design method is that the rollers must be cylindrical and cannot be conical, however, it is very difficult to calculate the cam profile and optimise the design 1. Using a conical cam with oscillating coni
8、cal roller followers as a benchmark, this paper builds the spatial profile equation of the grooved walls of the cone using the theory of single- Correspondence and offprint requests to: Dr Gui Yun Tian, School of Computing and Engineering, University of Huddersfield, Hudders- field, HD1 3DH, UK. E-m
9、ail: g.y.tian hud.ac.uk parameter curve family envelopes. This is the theoretical foun- dation for analysing the characteristics of machined surfaces, optimising performance parameters, and developing CAD/CAM systems for cams through 3D solid modelling software. This overcomes the traditional comput
10、ational difficulties associated with the definition of cam profiles. The availability of low-cost mobile access to telecommuni- cations and computing networks, and the sharp fall in the cost of storing and processing digital information have revolution- ised the way that organisations and individual
11、s think about publishing, accessing, and using information. There has been a qualitative and quantitative change in the volume and type of information that people need to design and manufacture products 24. Businesses have been recognising that change and interaction are now endemic in industry, and
12、 that sharing information, provided that it is controlled, can add more value than withholding information. Virtual corporations are developing, with devolved decision making and fluid bound- aries. Organisational change has moved from business process re-engineering, through enterprise transformati
13、on towards fully virtual organisations that are formed specifically to tackle major commercial opportunities or threats, and re-formed, with different constituent parts, as the opportunities change. Some users have already recognised a need for enhanced information sharing between enterprises not ju
14、st text and pictures, but anything that can be digitised. We have studied techniques that make it easier for people to create, destroy, manage, and retrieve information with the required qualities from globally interconnected distributed information sources, and investigated what the desired archite
15、ctures and assemblies for distributed information systems are. The first work on, and applications of, remote cooperative design began many years ago. In the middle of the 1980s, Cashman et al. of Massachusetts Polytechnic University were working in this area and presented the concept of CSCW (compu
16、ter supported cooperative work), which means the appli- cation of computers to facilitate cooperative working between different people in different places and on different tasks 5. In the AIMS research project 6, funded by the Wright Laboratory of America, strategies for advanced manufacturing, whic
17、h realised the transition from traditional manufacturing to 558 G. F. Yin et al. agile manufacturing, and, at the same time, reduced the risk of investment were investigated. As the whole system is open, any corporation can supply services to it and also can obtain services from it. A unit taking pa
18、rt in the virtual enterprise may be a corporation, part of a corporation, or a machining centre of a corporation, acting as an agent and connected with the information system of the virtual enterprises 79. The Tongji University and Hong Kong Polytechnic University in China have collaborated to inves
19、tigate the DNPS (dispersed network production system) 10 and implemented functions such as for broadcasting information, exchanging data and transferring files and have expanded the applications to corpora- tions 11,12. Consequently, building a dynamic remote cooperative system without geographic li
20、mitations, for the next generation manu- facturing system, is extremely attractive. This paper proposes the establishment of a distributed cooperative system, which can provide a remote mechanical parts design service by applying component-based Web technology with an extended B/S (browser/server) m
21、ode. As a case study, the system has The mapping collection of D constitutes a curved surface S in E3, whose vector format can be described mathematically as r r(u,v) r(x(u,v),y(u,v),z(u,v) (3) The parameterised format of a single parameter family of surfaces is described as r r(u,v, ) (4) where is
22、the parametric variant of the family of surfaces and u and v are the parameters for the specific family surfaces. Suppose there is a family of surfaces S . If there exists a surface S, each point P must belong to a surface S of the family. Furthermore, at the point P, the normal line of S is consist
23、ent with the normal line of the corresponding curved surface S , and for each surface of the family, if there is a point P in the surface S, on which the normal line of S is consistent with the normal line of S, then the surface S is called the envelope of the family of surfaces. At the same time, t
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 3. Web Based Remote Cooperative Design for Spati1
链接地址:https://www.deliwenku.com/p-2048.html
限制150内