25-10-2012, 04:16 PM
A Generic Inner-Loop Control Law Structure for Six-Degree-of-Freedom Conceptual Aircraft Design
ABSTRACT
A generic control system framework for both real-time and batch six-degree-of-freedom (6-DOF) simulations is
presented. This framework uses a simplified dynamic inversion technique to allow for stabilization and control of any type
of aircraft at the pilot interface level. The simulation, designed primarily for the real-time simulation environment, also can
be run in a batch mode through a simple guidance interface. Direct vehicle-state acceleration feedback is required with the
simplified dynamic inversion technique. The estimation of surface effectiveness within real-time simulation timing constraints
also is required. The generic framework provides easily modifiable control variables, allowing flexibility in the variables that
the pilot commands. A direct control allocation scheme is used to command aircraft effectors. Primary uses for this system
include conceptual and preliminary design of aircraft, when vehicle models are rapidly changing and knowledge of vehicle
6-DOF performance is required. A simulated airbreathing hypersonic vehicle and simulated high-performance fighter aircraft
are used to demonstrate the flexibility and utility of the control system.