基于知識工程(kbe)設(shè)計(jì)方法外文文獻(xiàn)翻譯-資料下載頁
2025-05-12 12:41本頁面
【導(dǎo)讀】設(shè)計(jì)被認(rèn)為是決定產(chǎn)品最終形態(tài)、成本、可靠性、市場接受程度的首要因素。產(chǎn)品成本的壓縮最可能發(fā)生在產(chǎn)品設(shè)計(jì)的最初階。整個(gè)生命周期階段大約百分之七十的成本花費(fèi)在概念設(shè)計(jì)階段結(jié)束時(shí)，縮短設(shè)計(jì)。周期的關(guān)鍵是縮短概念設(shè)計(jì)階段，這樣同時(shí)也減少了工程的重新設(shè)計(jì)工作量。工程權(quán)衡過程中采用良好的估計(jì)和非正式的啟發(fā)進(jìn)行概念設(shè)計(jì)。有必要，進(jìn)行涉及多個(gè)學(xué)科的交流合作來快速進(jìn)行。最后，必須能夠管理大量的特定領(lǐng)域的知識。時(shí)能夠?qū)υO(shè)計(jì)意圖達(dá)成共識。虛擬樣機(jī)將取代傳統(tǒng)的物理樣機(jī)，并允許設(shè)計(jì)工程師，研究。真正的虛擬原型，不僅代表形狀和形式，維幾何模型表示法。刪除和運(yùn)輸事實(shí)。有三種KBE的工具，目前正在探索和發(fā)展類型。期間，KBE是系統(tǒng)的連續(xù)的再設(shè)計(jì)的一種健壯設(shè)計(jì)技術(shù)。KBE實(shí)現(xiàn)了真正的并行工程攻克了一系列的捐助領(lǐng)域的專門知識在一個(gè)組織。KBE的供應(yīng)商有一個(gè)捕捉。通常情況下，KBE的開發(fā)將與方法顧
【正文】 These software tools are used to develop domainspecific design tools of the two KBE approaches,design advisor and the virtual prototype. Generative virtual prototype (GVP) The virtual prototype approach forms the basis of the KBE classes described, and is based on the use of the KBE software ICAD [5]. ICAD is used for metadesign, which is the design of design tools in the form of a product model. The product model is the framework for the product structure, engineering analysis, product cost, design standards,regulatory codes, material characteristics, manufacturing constrains and process plans. It is able to output a design report that represents the design state of the product. This report can include for example： data for analysis, 3D geometric models,bills of material, cost reports and manufacturing instructions. The GVP captures and automates the functional design rules and understood methodologies of the engineering process. The GVP provides functionally valid alternatives for engineers to select and manipulate. The 12 engineers add their judgement to optimize final systems designs. A generative virtual prototype (GVP) is a system model that represents both the geometric and nonD. Calkins, et geometric attributes of a product (an object) which are embedded in the KBE model. It stores knowledge about a system in a product model posed of design and manufacturing engineering rules,which address both geometric and nongeometric issues. A generative virtual prototype is a bination of these design rules and includes a set of engineering instructions used to create the design,that is, the vehicle geometry. The generative virtual prototype represents the engineering intent behind the geometric design. It can store product information such as geometry and material specifications as well as process and performance information. The generative virtual prototype paradigm is defined as follows： Generative： generate or automatically produce an instance of the virtual prototype in response to an input state vector. Take input specifications, apply relevant procedures and generate a design automatically. When the requirements change, the design is updated immediately along with all of performance outputs. Virtual： in effect although not in actual fact： a puter based model Prototype： original model or example of a particular type. Design rules KBE is based on the use of design knowledge in the form of ‘design rules’. The design rules form the kernel of an object. Design rules prise four basic categories： 1. Heuristics： prised of experimental rules of thumb and ‘best practices’.Usually based on corporate culture design heuristics. These are of the type, If (condition is true), then (action remended). 2. Empirical design rules： these rules are based on curvefitted expressions that are developed from experimental data. Metamodel technology used to develop models of plex systems. 3. Legislated constraints： these are prised of rules established by law or by engineering standards. 4. Laws of physics： based on first principles in the form of analytical or numerical models. Also known as parametric rules. These rules are usually simple algorithms that would be 13 solved using spreadsheet models. Design rules are used to synthesize the knowledge in the knowledge base and to establish how the knowledge is used in a given model. The design rules are used to both define and relate the attributes in a KBE model. The methods and processes of an engineer are mimicked by these rules. Design rule types include： . calculations . conditionals . lookup databases . fixed . variable . references . execute external programs . selections . optimizations.
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