机械设计类外文参考文献及翻译 第5页
support structure generation, slicing, path planning, and process parameter selection. Therefore, it is also very important for remote users that SB can provide these process planning techniques. Three sub-modules including the optimization of part orientation, support structure generation, and the optimization of part slicing, have been developed to aid effectively users in setting RP process variables in order to best achieve specific build goals and desired part characteristic. Both potential clients and real clients can employ freely the ASP tool set.
Electronic commerce module is composed of foursections: the online quote, build-time estimation, online business negotiation, and electronic contract management. Conventionally, the SB may quote according to the client’s offerings (e.g. CAD models, 2D drawings or physical prototypes) utilizing their experiences or just get payment after the RP model has been built. But for teleservice, it is necessary for the remote users to inquire about the service expense of making RP prototype before the follow-up process continues. Hence, an online pricing engine (OPE) has been developed. The details of the OPE Stereolithography oriented have been discussed in [39]. The accurate prediction of the build-time required is also critical for various activities such as: the job quoting, the job scheduling, the selection of build parameters (e.g. layer thickness and orientation), benchmarking, etc. Two build-time estimators based on sliced process and STL have been exploited, respectively. Ref. [40] presents the principle of a build-time estimation algorithm for Stereolithograpy based on model geometrical features. After clients accept initially the quote, they may negotiate with SB on the business and technological details. The Microsoft NetMeeting which can set up a collaborative environment to fulfill information sharing, file transferring, Video and Audio communication etc., provides an ideal tool for the online negotiation. It is also seamlessly integrated IE Browser, thus clients can call SB at any moment. As a result of negotiation, an electronic contract is to be signed. To effectively manage andoperate these electronic contracts, the system alsoprovides a contract management component. It is especially convenient and prompt for clients to submit, inquire, and search contract through this module.
The manufacturing service module which covers the job management, collaborative manufacturing, process monitor, and collaborative enterprises management, is regarded as one of the most important function modules in the service system. When a contract is confirmed, clients will formally submit their job requirements (e.g. RE, 3D CAD modelling, CAE, RP prototype, or rapid tooling) and sources (e.g. object parts, digitized data cloud, 2D models, 3D models, or .STL files). In order to help many novices submit quickly and easy the manufacturing tasks, various job and source templates have been created, while the client can search, modify, and even delete the manufacturing tasks itself if the occasion arises. The Collaborative Manufacturing System (CMS) is responsible for the selection of collaborative enterprises (CE). In addition, it is extraordinarily important and necessary to monitor the manufacturing schedule and control product quality to ensure smooth production. In the past, a SB had to spend much time on dealing with a lot of inquires from the clients by via phone calls or Faxes. Now, the Process Monitor System (PMS) provides various facilities which canguarantee the tasks to be completed timely. Any partners falling behind schedule or failing to meet quality standards will be closely examined by SB and users to ensure that precautionary or remedial measures are made ahead of time or any damaging effects are predicted.
All information (no matter if it is a real client being ready for a contract with the SB or just a potential one showing his intent or inquiry) involved in the whole service process are managed and maintained by a special Database. These data provide strong supports for both online business and manufacturing service. To create a collaborative environment among SB, users and CE, we have to rely fully on the multimedia and Internet. Therefore, the service system offers three enabling tools: Video conferencing system, Electronic white-boarding, and FTP. In order to make use of the system as quickly as possible, users can get help from the system navigation module. These nine components form a fully-integrated system that is able to carry out tasks in an efficient and effective way.
On the basis of the workflow and function module of service system, the system framework can be constructed as shown in Fig. 4. Fig. 5 illustrates the networked structure of service system.
 5. Configuration of running platform
In order to run this system effectively, constructing asuitable running platform is necessary and especially crucial. An operating system (OS) is one of the most basic software components for running this system. The operating systems commonly founded onWeb Servers are UNIX, OS, Linux, and Windows, etc. Windows 2000 Advanced

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