English

DTIC ADA162555: The Use of Quantitative Databases in Aladin, an Alloy Design System.

The Aluminum Alloy Design Inventor (Aladin) is an expert system that aids in the design of new alloys. The system uses traditional, rule based, qualitative methods as well as quantitative calculations. Our approach is to model the design process as a collaboration among several different bodies of expertise: composition in terms of elements to be added; properties of known alloys; internal sturcture, ranging from solid phases and microstructure down to the crystal lattice structure; and thermo-mechanical processing of the metal. The inference mechanism is a variant of hypothesize-and-test. The present implementation combines the Carnegie Representation Language (CRL) and OPS5 along with Lisp. A database of metallurgical knowledge and data on known alloys is built in the form of CRL schemata. The execution of the system is controlled by OPS productions and most of the data produced in a specific run is represented by OPS working memory elements. This paper gives a preliminary overview of the architecture of Aladin with emphasis on the couplng of symbolic and numeric computations. We breifly describe the knowledge representation of Alloys, Phase diagrams and Microstructure informatio

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