【正文】 KBE 的智能 CAD 軟件的使用 [5]。智能 CAD 使用為元設(shè)計，這是 設(shè)計工具設(shè)計在一個產(chǎn)品模型的形式。該產(chǎn)品模型是產(chǎn)品結(jié)構(gòu)，工程 分析，產(chǎn)品成本，設(shè)計標準，管理準則，材料特性，制造約束 和進程計劃的框架 。 它能夠輸出設(shè)計報告，表示該產(chǎn)品的設(shè)計狀態(tài)。 該報告可以包括例如：分析， 3 個數(shù)據(jù)的三維幾何模型，材料，成本報告和指示 草案 。 GVP 公司的捕獲和自動化功能設(shè)計的規(guī)則和方法的理解在工程過程。在 GVP 公司為工程師提供了有效的替代功能選擇和操作。工程師添加他們的判斷力，優(yōu)化設(shè)計，最終系統(tǒng)。 阿生成虛擬樣機 (GVP 公司 )是一個系統(tǒng)既是模型的幾何和非 24 。一個產(chǎn)品 (一個對象 )的幾何屬性中嵌入了 KBE 的模式。它存儲知識在組成一個產(chǎn)品模型系統(tǒng)設(shè)計和制造工程的規(guī)則，同時解決幾何和非幾何的問題。 阿生成虛擬原型是這些設(shè)計規(guī)則的組合，其中包括對工程指令用于創(chuàng)建的設(shè)計，也就是車輛的幾何形狀。生成虛擬樣機的代表背后的幾何設(shè)計工程意圖。它可以存儲諸如幾何和材料規(guī)格，以及過程和性能信息產(chǎn)品信息。 生成虛擬樣機的范 例被 定義如下 ： 生成 ： 生成或自動產(chǎn)生這一虛擬原型的實例，以響應輸入狀態(tài)向量。 采取輸入規(guī)范說明，運用相關(guān)的做法并且自動地引起設(shè)計。當要求改變時，設(shè)計與所有表現(xiàn)產(chǎn)品一起立刻被更新 。 虛擬的影響，雖然沒有實際的事實 ： [1]基于計算機模型 原型 ： 原來的模式，或一個具體的例子類型。 . 設(shè)計規(guī)則 KBE 是基于知識的設(shè)計使用形式的設(shè)計規(guī)則 ， 設(shè)計規(guī)則構(gòu)成了一個對象的核心 。設(shè)計規(guī)則包括 4 種 基本類型 ： ： 包括 實驗 的經(jīng)驗規(guī)則 和最佳做法。通常是基于企業(yè)文化設(shè)計的啟發(fā)。這些都是的類型，如果 (條件為真 )，然后 (行動推薦 )。 6 ： 這些規(guī)則根據(jù)從實驗性數(shù)據(jù)被開發(fā)的曲線適合的表示。 元模型技術(shù)用于開發(fā)復雜系統(tǒng)的模型。 ： 這些都是組成法律或工程的既定規(guī)則標準。 ： 首次原 則為基礎(chǔ)的分析或數(shù)值模式的形式 。也被稱為參數(shù)的規(guī)則。這些規(guī)則通常是使用報表模型解決簡單的算法。 設(shè)計規(guī)則用于合成中的知識基礎(chǔ)知識，如何在給定的模型建立知識。設(shè)計規(guī)則來定義和涉及雙方在知識經(jīng)濟模式的屬性。工程師的方法和過程由這些規(guī)則仿造。設(shè)計規(guī)則類型包括： .計算 .條件句 .查 尋 數(shù)據(jù)庫 .固定 .變量 .引用 .執(zhí)行外部程序 .選擇 .優(yōu)化。 KnowledgeBased Engineering (KBE) Design Methodology 7 BACKGROUND The development of plex systems requires a sequence of engineering and management decisions which must satisfy many peting requirements. Design is recognized as the primary contributor to the final product form, cost, reliability and market acceptance. The highlevel engineering design and analysis process (conceptual design phase) is particularly important since the majority of the lifecycle costs and overall quality of the system are determined during this phase. The major opportunities for cost savings occur in the earliest phases of a product design. Approximately seventy per cent of the lifecycle costs are frozen by the end of the conceptual design phase, Fig. 1. The key to shortening the design cycle is to shorten the conceptual design phase, which will also reduce the amount of engineering in the redesign stage. The engineering tradeoff process during conceptual design is undertaken using good estimations and informal heuristics. Current traditional CAD tool support is extremely limited for the conceptual design phase. There is need to rapidly conduct design analyses involving multiple disciplines municating together (trading off such things as performance, cost, reliability, etc.). Finally, it is necessary to be able to manage a large amount of domainspecific knowledge. The solution is to mit more resources at the conceptual design stage to reduce the cycle time by eliminating redesign. All of these factors argue for an integrated design tool and environment that can help make decisions early in the design synthesis (conceptual design) process. This integrated design tool will enable a diverse and multidisciplinary team of engineers, designers and stylists to achieve consensus of design intent under plex design requirements and increased design constraints. The design tool should allow the design team to examine more configurations at greater levels of detail. The problem then is to develop an architecture for a design tool that meets all of these requirements. VIRTUAL (DIGITAL) PROTOTYPE MODEL What is needed is a way to represent the product design process to obtain a true virtual prototype which would allow the early development and evaluation of a product. The virtual prototype would replace traditional physical prototypes and allow the design engineer to examine `whatif39。 scenarios while iteratively updating their designs. A true 8 virtual prototype would not only represent the shape and form, . the geometry, it would also represent nongeometric attributes such as weight, material, performance and