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Design and Assessment of a Two Degree of Freedom Gust Load Alleviation System

Ossmann, Daniel and Poussot-Vassal, Charles (2019) Design and Assessment of a Two Degree of Freedom Gust Load Alleviation System. 5th CEAS Conference on Guidance, Navigation & Control, 3.-5. April 2019, Mailand, Italien.

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Abstract

The design and assessment of a two degree of freedom gust load alleviation control system for a business jet aircraft is presented in this paper. The two degrees of freedom are a disturbance estimator to compute the incoming gusts as well as a feedback control law to mitigate the estimated disturbance to reduce the aircraft loads. To facilitate the estimator design, high order, infinite-dimensional models of the structural and aerodynamic aircraft dynamics are approximated by low order models using advanced model reduction techniques. For the robust disturbance estimator design an innovative approach relying on nullspace-based techniques together with non-linear optimization is proposed. Time delays, originating from the aerodynamics modeling, the discrete control loop, and the sensor and actuator dynamics, play a key role in the stability and performance assessment of a gust load alleviation controller. Thus, a novel analytical analysis method is presented to explicitly evaluate the influence of these time delays on the closed loop. Finally, the developed tool-chain is applied to a fly-by-wire business jet aircraft. The resulting two degrees of freedom gust load alleviation system is verified in a simulation campaign using a closed loop, non-linear simulator of the aircraft.

Item URL in elib:https://elib.dlr.de/127217/
Document Type:Conference or Workshop Item (Speech)
Title:Design and Assessment of a Two Degree of Freedom Gust Load Alleviation System
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ossmann, DanielDaniel.Ossmann (at) dlr.dehttps://orcid.org/0000-0003-4499-5639
Poussot-Vassal, CharlesCharles.Poussot-Vassal (at) onera.frUNSPECIFIED
Date:2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Flugregelung, Lastabminderung, Ordnungsreduktion, elastisches Flugzeug
Event Title:5th CEAS Conference on Guidance, Navigation & Control
Event Location:Mailand, Italien
Event Type:international Conference
Event Dates:3.-5. April 2019
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
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of System Dynamics and Control > Aircraft System Dynamics
Deposited By: Ossmann, Daniel
Deposited On:13 May 2019 14:57
Last Modified:31 Jul 2019 20:25

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