Aeronautics and astronautics – Aircraft control – Automatic
Patent
1977-12-12
1979-10-16
Eisenzopf, Reinhard J.
Aeronautics and astronautics
Aircraft control
Automatic
244194, 318565, 318584, 364435, G05D 108
Patent
active
041711157
ABSTRACT:
The outputs of a pair of linear accelerometers are utilized to provide measures of craft vertical acceleration and body axis pitch angular acceleration. The pitch angular acceleration signal is integrated to provide a measure of body axis pitch rate. The pitch rate signal is in turn integrated to provide a measure of body axis pitch attitude. An earth referenced pitch attitude sensor provides a measure of earth referenced pitch attitude and through a rate taker a measure of earth referenced pitch rate. The earth referenced sensor is utilized to calibrate out errors and effectively align the linear accelerometers so that in the event of a loss of the earth referenced sensor, the calibrated accelerometers have adequate accuracy to compute pitch rate and pitch attitude within the long period bandwidth needed to provide the stability augmentation function for a relaxed static stability aircraft. The earth referenced and body axis pitch rate signals are blended and the earth referenced and body axis pitch attitude signals are blended whereby steady state differences therebetween are washed out through a long time constant washout, the earth referenced signals dominating in the steady state. The linear vertical acceleration and angular acceleration signals and the blended pitch rate and pitch attitude signals are combined in a control law to drive the craft elevator servo. Failure of the earth referenced attitude sensor results in a graceful degradation of the control law to washed out body axis attitude and attitude rate control.
REFERENCES:
patent: 2487793 (1949-11-01), Esval
patent: 2808999 (1957-10-01), Chenery
patent: 3007656 (1961-11-01), Miller
patent: 3100861 (1963-08-01), Osder
patent: 3752420 (1973-08-01), Osder
Cooper Albert B.
Eisenzopf Reinhard J.
Sperry Rand Corporation
Terry Howard P.
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