Aeronautics and astronautics – Aircraft control – Automatic
Patent
1987-04-07
1989-04-18
Barefoot, Galen
Aeronautics and astronautics
Aircraft control
Automatic
364434, B64C 1316
Patent
active
048219827
ABSTRACT:
A method for controlling an aircraft to prevent high G-caused pilot unconsciousness. Data defining a state space of acceleration, rate of change of acceleration and duration of acceleration at maximum acceleration within which an aircraft may be operated without causing pilot unconsciousness is provided to an aircraft intelligent flight control system. The flight control system continuously monitors the past and present state of the aircraft and compares to the surface boundaries of the defined safe state space, Whenever the aircraft exceeds those boundaries, the flight control system intervenes to unload the aircraft to within those boundaries. Additional data and measurements may be added to define an n-dimensional state space. Another embodiment unloads the aircraft to a baseline acceleration. A simplified embodiment is described which compares current acceleration to a preselected value of acceleration. If the current acceleration exceeds the preselected value, the previous acceleration onset rate is compared to a preselected acceleration onset rate. If it exceeds the preselected onset rate, the duration of time the current and immediately past acceleration has exceeded the preselected value of acceleration is determined. If that value is greater than a preselected duration, the flight control system commands the aircraft to perform an unloading maneuver to reduce the G loading on the aircraft to a preselected baseline acceleration.
REFERENCES:
patent: 2869804 (1959-01-01), Muinch et al.
patent: 2949260 (1960-08-01), Smith et al.
patent: 3780723 (1973-12-01), Van Patten et al.
patent: 4219039 (1980-08-01), Jaggars
patent: 4243024 (1981-01-01), Crosbie et al.
patent: 4534338 (1985-08-01), Crosbie et al.
Barefoot Galen
Corl Rodney
Sinder Fredric L.
Singer Donald J.
The United States of America as represented by the Secretary of
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