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Main Title: Applying eigenstructure assignment to inner-loop flight control laws for a multibody aircraft
Author(s): Köthe, Alexander
Luckner, Robert
Type: Article
Abstract: Unmanned aircraft used as high-altitude platform system has been studied in research and industry as alternative technologies to satellites. Regarding actual operation and flight performance of such systems, multibody aircraft seems to be a promising aircraft configuration. In terms of flight dynamics, this aircraft strongly differs from classical rigid-body and flexible aircraft, because a strong interference between flight mechanic and formation modes occurs. For unmanned operation in the stratosphere, flight control laws are required. While control theory generally provides a number of approaches, the specific flight physics characteristics can be only partially considered. This paper addresses a flight control law approach based on a physically exact target model of the multibody aircraft dynamics rather than conventionally considering the system dynamics only. In the target model, hypothetical spring and damping elements at the joints are included into the equations of motion to transfer the configuration of a highly flexible multibody aircraft into one similar to a classical rigid-body aircraft. The differences between both types of aircraft are reflected in the eigenvalues and eigenvectors. Using the eigenstructure assignment, the desired damping and stiffness are established by the inner-loop flight control law. In contrast to other methods, this procedure allows a straightforward control law design for a multibody aircraft based on a physical reference model.
Subject(s): flight control theory
control allocation
multibody aircraft
highly flexible aircraft structures
Issue Date: 21-Dec-2021
Date Available: 17-May-2022
Language Code: en
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Sponsor/Funder: TU Berlin, Open-Access-Mittel – 2021
Journal Title: CEAS Aeronautical Journal
Publisher: Springer Nature
Volume: 13
Publisher DOI: 10.1007/s13272-021-00549-z
Page Start: 33
Page End: 43
EISSN: 1869-5590
ISSN: 1869-5582
TU Affiliation(s): Fak. 5 Verkehrs- und Maschinensysteme » Inst. Luft- und Raumfahrt » FG Flugmechanik, Flugregelung und Aeroelastizität
Appears in Collections:Technische Universität Berlin » Publications

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