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Force Fight in Parallel-Redundant Electro-Mechanical Actuation Systems

Kowalski, Robert (2017) Force Fight in Parallel-Redundant Electro-Mechanical Actuation Systems. In: Proceedings of More Electric Aircraft 2017. More Elelectric Aircraft 2017, 01.-02. Feb. 2017, Bordeaux, Frankreich.

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In parallel-redundant actuation systems operating in active/active mode a position offset between the actuator outputs can lead to excessive forces and torsion of the primary flight control surface. The key drivers leading to a substantial force fight in systems involving two nominally identical electro-mechanical actuators (EMAs) were identified using a detailed nonlinear system model. While in hybrid configurations involving an EMA and a hydraulic actuator, dissimilar dynamics are the main source for a force fight, in the system at hand parameter deviations from the nominal state are crucial. A worst case study is performed to quantify the maximum resulting force fight paying special attention to wear causing increased gear backlash and friction, sensor uncertainties and signal delays. Moreover Monte Carlo simulations give insight in the likelihood of the event of excessive force fight assuming Gaussian and uniform distributions of the identified key parameters. It is concluded that active compensation measures are compulsory to avoid parasitic forces and to ensure a good load sharing. Differences to purely hydraulic configurations are pointed out.

Item URL in elib:https://elib.dlr.de/111049/
Document Type:Conference or Workshop Item (Poster)
Title:Force Fight in Parallel-Redundant Electro-Mechanical Actuation Systems
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kowalski, RobertRobert.Kowalski (at) dlr.deUNSPECIFIED
Date:1 February 2017
Journal or Publication Title:Proceedings of More Electric Aircraft 2017
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:electro-mechanical actuators, force fight, Primary flight control
Event Title:More Elelectric Aircraft 2017
Event Location:Bordeaux, Frankreich
Event Type:international Conference
Event Dates:01.-02. Feb. 2017
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: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Safety Critical Systems and Systems Engineering
Deposited By: Kowalski, Robert
Deposited On:02 Mar 2017 11:50
Last Modified:31 Jul 2019 20:08

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