Effectively calculating supersonic and hypersonic dynamic derivatives

Dynamic derivatives are the original input parameters for stability and maneuverability analysis in aircraft design. Engineering methods and unsteady CFD methods are the main techniques for calculating dynamic derivatives at present. For the two methods, the former has higher efficiency but with lower accuracy, while the latter requires high computational cost. The local piston theory combines the advantages of high precision of CFD technology and high efficiency of classical piston theory. Local piston theory based on steady CFD method is used to calculate dynamic derivatives efficiently and accurately for supersonic and hypersonic aircraft. The formulas of dynamic derivatives are derived for rigid symmetric modes. Comparison with the experiment data of two standard models proves preliminarily that our method for calculating supersonic and hypersonic dynamic derivatives attains good precision at relatively lower computational cost and is thus indeed effective.