RAPID CONCEPTUAL DESIGN EVALUATION USING A VIRTUAL PRODUCT MODEL

This paper presents an architecture and test results for a computer-ba sed system for assisting the conceptual phase of building design. The system uses 3D CAD to represent a graphic model of the design, and it uses AI symbolic models of the geometric forms, intended functions and computed and assigned behaviors of the design. The system uses AI sym bolic reasoning methods to analyze design behavior and compare predict ed behavior with intended function. The Semantic Modeling Extension (S ME) system incorporates a virtual product model. a small brit extendib le set of classes that define generic forms, functions and behaviors o f facilities. After drawing a design using 3D CAD, a designer interact ively creates interpretation objects as instances of the virtual produ ct model. The interpretation objects express the meaning of the graphi c representation with respect to a particular engineering issue, such as energy use or cost. The interpretation represents geometric and top ological attributes of rite features for use by automated design analy sis tools. interpretation objects unite support for graphically-orient ed design thinking with support for automated symbolic reasoning. The paper includes an example building design scenario using the software prototype, illustrating how interpretation of the geometric model prod uces a symbolic model and supports multiple and changing analyses and evaluations during design. Students and practising engineers have test ed the system in classes and workshops. Copyright (C) 1996 Elsevier Sc ience Ltd