Missile Shape Aerodynamic Design Research, Optimization And Stealth Integration

With the development of the stealth technology, stealth performance becomes more and more important in the missile configuration design. Therefore, the integration design of aerodynamic configuration and stealth for the missile is discussed in this paper. The integration design is considered as a multi-objective optimization here. The integration design system is built according to the actual condition of concrete missiles.The system includes building the geometric database of the missile configuration, computing the aerodynamic performance and RCS (Radar Cross Section), and handling the multi-objective optimization problem. Building the geometric database of the missile configuration means the generation of the fitted coordinates. For aerodynamic performance, the Green's function method for steady aerodynamics is used as the basic method and the engineering method is used to compute the none lift drag. For RCS, by analyzing the frequency performance of radar scattering and the radar scattering source of the missile parts, the physical optics method and the equivalent current method are used as the basic methods. Since deferent parts of the missile have deferent contribution to aerodynamic and stealth performance, the optimization process is related to the deferent parts of the missile. As for the multi-objective optimization problem, it is turned to single-objective optimization by using weighting objectives method. For the single-objective optimization, the flexible tolerance polyhedron method and the genetic algorithm are separately introduced to compare the deference between them. Finally, by using such integration design system, the integration optimization designs for two models of missiles are given in the paper.