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Design and Flight Testing of Incremental Nonlinear Dynamic Inversion based Control Laws for a Passenger Aircraft

Grondman, Fabian and Looye, Gertjan and Kuchar, Richard and Chu, Qi Ping and van Kampen, Erik-Jan (2018) Design and Flight Testing of Incremental Nonlinear Dynamic Inversion based Control Laws for a Passenger Aircraft. AIAA SciTech Forum 2018, 8.-12.Jan. 2018, Kissimmee, FL, USA.

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This paper describes the design, implementation and flight testing of flight control laws based on Incremental nonlinear Dynamic Inversion (INDI). The method compares commanded and measured accelerations to compute increments on the current control deflections. This results in highly robust control solutions with respect to model uncertainties as well as changes in aircraft dynamic characteristics of failure cases during flight. At the same time, the complexity of the algorithms is similar to classical ones. The key for practical implementation is in ensuring synchronization between angular acceleration and control deflection measurements or estimates. The underlying theory and practical design methods of INDI are very well understood, but implementation and testing has remained limited to sub-scale UAVs. The main contribution of this paper is to present the design and validation of manual attitude control functions for a Cessna Citation II experimental aircraft, covering control structure design, application of INDI, design optimization, robustness analyses, software implementation, ground and flight testing. For comparison, also control laws based on classical Nonlinear Dynamic Inversion were implemented and flown. The flight tests were highly successful and marked the first successful demonstration of INDI on a CS-25 certified aircraft. The flight test results proved that INDI clearly outperforms NDI and provided valuable lessons-learnt for future applications.

Item URL in elib:https://elib.dlr.de/124710/
Document Type:Conference or Workshop Item (Speech)
Title:Design and Flight Testing of Incremental Nonlinear Dynamic Inversion based Control Laws for a Passenger Aircraft
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Grondman, FabianFabian.Grondman (at) dlr.deUNSPECIFIED
Looye, Gertjangertjan.looye (at) dlr.deUNSPECIFIED
Kuchar, Richardrichard.kuchar (at) dlr.deUNSPECIFIED
Chu, Qi PingDelft University of TechnologyUNSPECIFIED
van Kampen, Erik-JanDelft University of TechnologyUNSPECIFIED
Date:8 January 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Flight testing, nonlinear control, adaptive control, flight control, incremental control, nonlinear dynamic inversion
Event Title:AIAA SciTech Forum 2018
Event Location:Kissimmee, FL, USA
Event Type:international Conference
Event Dates:8.-12.Jan. 2018
Organizer:American Institute of Aeronautics and Astronautics (AIAA)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of System Dynamics and Control > Aircraft System Dynamics
Deposited By: Looye, Dr. Gertjan
Deposited On:12 Dec 2018 13:01
Last Modified:12 Dec 2018 13:01

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