DEVELOPMENT OF INTELLIGENT CAD FOR AIRCRAFT CONCEPTUAL DESIGN

最初的飞机概念设计传统上是通过对从目前使用的飞机上获得的经验数据进行统计处理来进行的。飞机的大小要符合使用者和适航规则的要求，这些规则只是为了安全而设置的。然而，最近计算机技术的进步使飞机的初始尺寸确定成为可能，同时通过使用小型计算机来考虑飞机的详细性能。在本研究中，提出了一种优化飞机机翼和机身性能的方法。用面元法计算气动性能，通过非线性优化得到最优外形，并用BASIC语言在PC机上编制了经典的经验数据定尺程序。与气动优化程序的统一仍是未来的问题。

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.