Abstract
An analytical investigation of rudder control strategies in transport aircraft is undertaken. The study was motivated by an airline crash in which rudder usage by the pilot might have been a contributing factor. A detailed mathematical model of the human pilot is employed in a computer simulation to examine the closed-loop nature of rudder control strategies. Emphasis is placed on pilot-induced oscillation tendencies. A task suitable for pilot-in-the-loop flight-simulator evaluation of rudder control systems is proposed. A comparison of the pedal force/feel characteristics of three transport aircraft and a military helicopter is provided. The adverse effect that highly nonlinear pedal force/feel system characteristics can have on pilot/vehicle response predictability is demonstrated. A linearity index is defined to quantify the linear force/displacement characteristics of any force/feel system. Nomenclature A(−) =g ain factors in vehicle transfer functions ayps = lateral acceleration at pilot’s station, g
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