Abstract
INTRODUCTION An analytic tool to predict lateral PilotInduced Oscillation (PIO) tendencies in fixed-wing aircraft has been developed. This tool is an extension of previous work that developed a longitudinal flying qualities criterion and longitudinal PIO metric using the Time Domain Neal-Smith (TDNS) criterion. This development used 32 flight control system (PCS) configurations including the effects of FCS time delays and rate-limited actuators to evaluate susceptibility to lateral PIO. Results are presented for selected configurations to demonstrate the effects of time delay, rate-limiting, roll control effectiveness, and time response bandwidth on aircraft response and PIO tendencies. Lateral flying qualities are evaluated by the application of the lateral TDNS criterion and PIO tendencies are identified by an associated lateral PIO metric. The PIO forcing function of the lateral TDNS PIO metric is correlated to rolling agility parameters which are flight-tested measures of the quickness and precision of closed-loop aircraft responsiveness.
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