Helicopter integrated fire and flight control system having turn

Details Helicopter integrated fire and flight control system having turn Helicopter integrated fire and flight control system having turn

1992-05-19

1993-11-23

Focarin, Margaret A.

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

244 75R, 89 4121, B64C 1134

Patent

active

052636623

ABSTRACT:
During operation of a flight control system in a coupled aiming mode, wherein a fire control system (55) azimuth command and elevation command provide an aircraft attitude reference, a bank angle calculation function (1077) provides a bank angle signal to place the aircraft in a roll angle which results in a substantially coordinated turn. The bank angle signal is determined primarily as a function of an aiming line of sight heading rate for small azimuth commands, and is determined primarily as a function of aircraft heading rate for large azimuth commands. Additionally, the bank angle initially comprises a component as a function of aircraft lateral acceleration for driving aircraft lateral acceleration to zero, and after the aircraft assumes a roll attitude for turn coordination, the bank angle comprises a component as a function of aircraft side slip for driving aircraft side slip to zero. Automatic turn coordination is disabled if the pilot maneuvers the aircraft to avoid a coordinated turn, and is re-enabled if the pilot maneuvers the aircraft into a coordinated turn attitude.
A rate feedback path (143) is provided during operation in the coupled aiming mode wherein aircraft yaw and pitch rate error signals are respectively replaced by the rate of change of the azimuth command and the elevation command. During operation in the coupled aiming mode, intended pilot commanded maneuvers maintain full authority at all times.

REFERENCES:
patent: 4067517 (1978-01-01), Barnum
patent: 4206891 (1980-06-01), Perez et al.
patent: 4528891 (1985-07-01), Brunello et al.
McDonnell Douglas Helicopter Company, Integrated Air-to-Air Weapon (INTAAW) Evaluation System Definition Report, Final Issue, 23 Jan. 1990, pp. 6-1 to 6-31.
"A Simulator Investigation of Parameters Affecting Helicopter Handling Qualities in Air Combat (HAC II)", pp. 1-18, by Michael S. Lewis and M. Hossein Mansur, Aerospace Engineers, Ames Research Center; and Robert T. M. Chen, NASA Ames Research Center.
IFEE AES Systems Magazine, Jan. 1992, "Integrated Flight/Fire Control for Attack Helicopters", pp. 17-23, by Stephen Osder of McDonnell Douglas Helicopter Company.
Chief Engineer, vol. 6, No. 4, Jul.-Aug. 1983, "Design and Analysis of a Digitally Controlled Integrated Flight/Fire Control System", pp. 251-257, by John H. Blakelock, Applications Research Corporation.

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