PERFORMANCE AND DESIGN CRITERIA OF AN ADAPTIVE CIRCUIT PROPOSED FOR A SPACE RE-ENTRY VEHICLE 600283
The design criteria and performance requirements for an adaptive circuit which compensates flight control systems over a wide range of flight conditions and aerodynamic parameters such as encountered during re-entry into the earth’s atmosphere are described. A theoretical analysis is presented which shows how the aerodynamic and structural bending characteristics of the vehicle establish these criteria and requirements and affect the choice of an adaptive circuit for an automatic flight control system. The adaptive circuit described includes a linear gain-changing element which maintains the rate loop of the flight control system at its neutrally stable point. A mathematical model of the adaptive circuit loop is derived by considering small perturbations about an operating point.