DEVELOPMENT OF INTELLIGENT CAD FOR AIRCRAFT CONCEPTUAL DESIGN

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The initial aircraft conceptual design has traditionally been made with the help of the statistical treatment of the empirical data taken from the aircrafts currently in use. Aircrafts are sized to match the requirements both from the user and from the airworthiness regulations which are set just for safety. Sizings were done mostly by tedious trial-and-error method.The recent advances in computer technology, however, make it possible to perform the initial sizing of aircrafts while taking into account the aircraft detailed performance by using small computers. In the present research a method of sizing aircraft wings and fuselages optimized for performance is presented. The aerodynamic performances are computed by using the panel method and the optimum shapes are obtained through the nonlinear optimization.The classical sizing procedure using the empirical data is also programed for personal computer in BASIC language. Unification with the aerodynamic optimization program remains to be a future problem.