Gain-scheduled linear-quadratic-regulator synthesis for the centre of gravity variations of Boeing 747-100 longitudinal modes
Year: 2022
Type: article
Abstract: Characteristic aircraft (A/C) responses during varied flight modes always concern researchers as the A/C dynamics regularly change at altitude (H) and Mach number (M) constraints.The A/C centre of gravity (CG) locations also transit along flight conditions and may cause severe structural vibrations since the CG position is a dominant parameter for the longitudinal characteristics because the gravity vector does not lie in the plane of the lateral flight [1].The fore-and-aft CG locations affect longitudinal stability and control.The Boeing 747-100 (B747-100) A/C"s CG symptomatically lies at 25% mean aerodynamic chord (MAC) (MAC length nearly 32 m from the nose tip) [2].*Author for correspondenceThe CG characteristically shifts from 11% to 33% of a MAC as M and H vary [1].CG positions have to satisfy flying qualities as payloads alter alongside the flight.The variable CG locations also cause higherfrequency structural vibrations that can degrade the A/C flying qualities and the controller performances [2].The coupling degree between an airframe and controller dynamics has to be well assessed for stable CG location margins.Un-modelled CG uncertainties over the flight envelope are a reason for the severity in the stability and control management.A highly authenticated control system that would have to handle the uncertain operations and disturbed parameters should be pursued instead of fixed-gain control applications [3].Those systems would jeopardise the overall performance and robustness as the system gains vary over the operating conditions.The stability
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
Funder: Coventry University
OpenAlex ID: W4288967864