On Flying-Handling Qualities of B747-100 Longitudinal Flight based on Gain Scheduling Control

Abstract

This paper evaluates flying handling qualities (FHQ) for the Boeing 747-100 (B747-100) in longitudinal flight. A genuine control has been realized using the spline gain-scheduling approach and full-state feedback linear quadratic regulator (FSFLQR). Converged steady-state responses have been shown for longitudinal states over Mach number and altitude ranging from 0.2 to 0.9 and sea-level to 12190m respectively. However, the FHQ verifications of such gain-scheduling control design are done using control anticipation parameter (CAP), normalised parameters of pitch rate and Cstar (combination effects of pitch rate, pitch and normal acceleration responses). The controller has been identified at which those conditions to be reformulated so that all the FHQ criteria are being satisfied. The CAP criterion well respects the level I of FHQ boundaries. However, some spectra of normalised pitch rate and Cstar with respect to their steady states slightly infringe the FHQ boundaries. This study has shown such a successful implementation of the gain-scheduling controller in terms of converged normal accelerations as well.

Keywords

• Flying handling quality
• Tracking longitudinal responses
• Gain scheduling
• Pitch rate criterion
• CAP criterion
• Cstar criterion
• Normal acceleration

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