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- W2593275527 abstract "Concorde's unique low-speed handling qualities are acceptable when flown in a rigidlyprocedural manner by experienced pilots. However, to be commercially viable andenvironmentally acceptable more numerous second generation supersonic transport(SST) aircraft would have increased passenger carrying capacity, range and theflexibility to integrate with sub-sonic air traffic. Their much larger size, weight andinertia compared to Concorde's, combined with increasing levels of relaxed longitudinalstability to improve aerodynamic efficiency, results in unstable dynamics and degradedhandling qualities on the final approach, where precise manual flightpath control isrequired.Modern fly-by-wire command and stability augmentation systems can restore stability,provide task tailored command laws and an associated level of handling qualities. NonlinearDynamic Inversion (NDI) enables control law prototyping and analysis for therapid assessment, of conceptual designs to identify control power and commandresponse requirements using both off-line and real-time simulation. This study hasdeveloped and applied NDI, and its realisable form (RNDI), in a novel way to designflight control laws specifically addressing handling quality requirements using selectedcriteria.Piloted validation has demonstrated that NDI pitch rate command will consistentlyprovide Level 1 low-speed handling qualities in both steady and turbulent conditions.However, the best handling qualities can be achieved through a second order pitch rateresponse, generated by pre-filters, designed to author-suggested constraints on controlanticipation parameter (CAP). The SST pitch rate criterion envelope, modified to ensurepositive pitch attitude dropback, can then be applied to verify the time response. Theresulting pre-filters are easily applied to RNDI inner loop controllers and would bestraightforward to implement with simple and proven sensor requirements.Carefully designed NDI normal acceleration command laws are also capable ofgenerating Level 1 low-speed handling qualities in steady conditions. However, theirdegraded performance in turbulence was exacerbated, relative to the pitch ratecommand laws, by the use of a fixed base simulator for pilot evaluation. Further motionbased simulation studies would provide, in addition to pitching motion, the normalacceleration response cues necessary for a fair command law comparison to be made." @default.
- W2593275527 created "2017-03-16" @default.
- W2593275527 creator A5088695988 @default.
- W2593275527 date "2001-11-01" @default.
- W2593275527 modified "2023-09-26" @default.
- W2593275527 title "Flight control for advanced supersonic transport aircraft handling quality design" @default.
- W2593275527 hasPublicationYear "2001" @default.
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