In-flight simulators will play an important and unique role in the development process of future helicopter systems and in generating credible handling qualities data which establish design guides for the integrated helicopter systems including sophisticated cockpit technologies and high authority control systems. The Institute for Flight Mechanics of DLR has developed the helicopter in-flight simulator ATTHeS (Advanced Technology Testing Helicopter System) which is based on a BO 105 helicopter. The testbed is equipped with a full authority nonredundant fly-by-wire control system for the main rotor and a fly-by-light system for the tail rotor. In the simulation mode the testbed requires a two-man crew, a simulation and a safety pilot. The onboard computer system consists of two computers to which are assigned the separated tasks, data collection and digital control system. With the implemented software structure the flexibility is achieved to change the control laws without any changes in the real time process. Before undergoing any flight test with a new or modified control system, a real-time hardware/software-in-the-loop ground-based simulation has to be successfully performed. For the purposes of in-flight simulation an explicit model following control system was developed and the model following performance was evaluated in flight. This control system is composed of a dynamic feedforward, based on an extended model of the host helicopter, and an optimized feedback control system. The capability and flexibility of ATTHeS has been demonstrated in different test programs which have been related to the use of the testbed for test pilot training, handling qualities research, helicopter simulation, and control law design and evaluation including automatic navigation and hover position hold.
Model Following Control for Tailoring Handling Qualities: Act Experience with Atthes
1995
15 pages
Report
Keine Angabe
Englisch
Avionics , Active control , Airborne/spaceborne computers , Control systems design , Controllability , Flight control , Flight simulation , Flight simulators , Fly by wire control , Helicopter control , Optimal control , Aircraft equipment , Automatic pilots , Computerized simulation , Control theory , Digital systems , Feedback control , Feedforward control , Hovering , Inertial navigation , Foreign technology
Model Following Control for Tailoring Handling Qualities - ACT Experience with ATTHeS
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