Structured data includes spreadsheets, address books, con- figuration parameters, financial transactions and technical drawings. One of XML’s advantages is the share and reuse of data. Te language is designed for describing, not for the presentation of structure data. Te process parameters for simulation, which are input by clients, are transferred and reused between different modules of the system. Te client can generate, present, revise, receive and submit XML files dynamically. Both the CAD file and process parameters are transferred
to the web server. Once the computing request is submitted, the web server queues this task and selects the available sub- server to perform the computation. Te client can inquiry the computing process at any time and download the results after the computing is finished. Te client then can analyze any defects and improve the design according to the simula- tion result. Fig. 3 shows a flow chart of the system. A java-based multi-tier B/S architecture used for this
web-based simulation system could include a presentation tier, logical tier, distributed computing tier and data tier (Fig. 4). Te system would include seven functional modules: web-side file management, kernel computing (including a pre-processing sub-module and simulation sub-module), post-processing, network security, computing management, account management and material database. Each of the modules provides a service to the metalcaster working with the system. Web-Side File Management Module—Tis module man-
ages the CAD files uploaded to the web server. Metalcasters can upload, download, delete or rename data files and create file folders through the web. Kernel Computing Module—Te function of the module is to partition CAD data files to grid data files and initial data files
数据格式的CAD文件，登录到网络，上传文件，填写 必须的铸造工艺参数。
扩展标记语言（XML）是网络上结构型文件和数据 的通用格式。结构化的数据包括数据页、地址簿、参数 描述、财务转账和技术图纸。XML的一个好处是数据 的共享和重复使用。有用户输入的工艺参数在不同系统 模块间进行传递和使用。用户可以动态产生、显示、修 改、接收和提交XML文件。
CAD文件和工艺参数都要上传到网络服务器。一旦 提交了计算需求，网络服务器将进行任务排队并选择可 用的分支服务器进行运算。客户可以随时查询计算进 程，计算结束后可以下载计算结构。然后客户可以分析 铸造缺陷并改进工艺。图1为系统流程图。 基于网络的模拟系统采用了基于Java的多层次B/S架 构（如图3），包括表现层、逻辑层、分布计算层和数 据层。系统包括七个模块：网络文件管理、核心计算 （前处理子模块和模拟计算子模块）、后处理、网络安 全、计算管理、账户管理和材料数据库（如图4）。每 个模块给网络用户提供一项服务。 网络文件管理模块 该模块管理CAD文件的上传。铸 造工作者可以上传、下载、删除或重命名数据文件，可 以通过网络创建文件目录。
Fig. 4. The web-based simulation system would operate with the use of four computing tiers.
圖。 4。基於 Web的仿真系統的操作與使用將四個計算層。 Summer 2011
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