System for determining the airspeed of helicopters

Details System for determining the airspeed of helicopters System for determining the airspeed of helicopters

1992-02-20

1993-05-25

Black, Thomas G.

Boots, shoes, and leggings

364150, 364434, 244 1713, G06F 1550

Patent

active

052145964

ABSTRACT:
System for determining the airspeed of helicopters, having a coupled measuring device to which is supplied by the cyclic and collective control signals, the attitude angles and the rotational velocities about the axes of the helicopter. The measuring device contains two models, namely a first model of the input behaviour of the helicopter motion, on which the cyclic and collective control signals act as input, and a second model of the system behaviour of the helicopter, on which the condition parameters act as input parameters. The estimated state parameters are obtained in an integration stage by integration of the algebraic sum of the outputs of the two models and the output signal of the correction arrangement, from which the values of the the velocity components are supplied to an indication. The integration stage is connected in front of a correction arrangement for the measured parameters of the rotational velocity and the attitude angle. There is further provided an arrangement for the compensation of steady state model errors.

REFERENCES:
patent: 4023409 (1977-05-01), Durand
patent: 4092716 (1978-05-01), Berg et al.
patent: 4300200 (1981-11-01), Doe
patent: 4355358 (1982-10-01), Clelford et al.
patent: 4382283 (1983-05-01), Clelford et al.
patent: 4567564 (1986-01-01), Bittner et al.
Rainer Schwable, "Versuche in der BO 105 zur Messung der Fahrt und des Wis" Litton Technische Werks, no date.
Evaluation of the Helicopter Low Airspeed System Lassie, by J. Kaletka, Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt e.V., Germany, no date.
Flight Evaluation Pacer Systems Low-Range Airspeed System LORAS 1000. U.S. Army Aviation Engineering Flight Activity, California. May 1977.
A New Internal Low Airspeed System for Helicopters, by J. Mandle. Aerospace Division Crouzet, France. May 20, 1985.
A Method of Helicopter Low Airspeed Estimation based on Measurement of Control Parameters, by A. J. Faulkner et al. Messerschmitt-Bolkow-Blohm GmbH, Germany. Sep. 1979.
Flight Investigations of a Helicopter Low Airspeed Estimation System Based on Measurement of Control Parameters, by A. J. Faulkner et al. Messerschmitt-Bolkow-Blohm GmbH, Germany. Sep. 1980.

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