A gust alleviation system was applied to low wing loading and high aspect ratio aircraft in order to decrease gust induced vertical acceleration. An open loop gust alleviation system (OLGA) was realized. Gust angle is calculated from sensor signals and fed to the actuators which control the symmetric aileron as lift flaps and the horizontal stabilizer. Flight tests of the aileron rod control, for certification and parameter identification, for system optimization, and the demonstration of system efficiency show a substantial decrease in the gust induced vertical acceleration and pitch rate in the frequency range below 3 Hz. However, passenger comfort is far more determined by higher frequencies than expected. Problems are found by stimulating the natural frequencies of the aircraft structure. A fundamental improvement of system behavior is reached by implementation of specific notch filters.
Flight Test of the Open Loop Gust Alleviation (OLGA) System
1984
75 pages
Report
No indication
English
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