ALFLEX is aimed at demonstrating unmanned automatic landing technology and evaluating low speed flight characteristics of a vehicle with the HOPE configuration. In these experiments, the experimental vehicle, a 37% subscale model of HOPE, is transported by a helicopter with hanging equipment to a predetermined release point at a height of 1,500 meters, and then released at a velocity of 45 meters per second (90 knots) to land automatically. Before releasing, the vehicle is supported at its center of gravity with gimbals to fly with five degree of freedom. This configuration, named constrained flight, enables the vehicle to be released with-out sudden transient motion. Furthermore, before the experiments, several constrained flight tests will be conducted to verify the control system's performance, and the aerodynamic characteristics will be pre-estimated by wind tunnel tests. This report describes a mathematical model of the ALFLEX constrained flight system and analysis of its dynamic characteristics.
Simulation Analysis of ALFLEX Constrained Flight
1996
31 pages
Report
No indication
English
Aeronautics , Aerodynamics , Spacecraft Trajectories & Flight Mechanics , Aircraft models , Flight tests , Aerospace planes , Reentry vehicles , Low speed , Subsonic flight , Aerodynamic configurations , Dynamic structural analysis , Control surfaces , Control systems design , Automatic landing control , Center of gravity , Degrees of freedom , Aerodynamic stability , Constraints , Foreign technology , ALFLEX(Automated Landing Flight Experiment) , Automated Landing Flight Experiment , Constrained flight
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