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Experimental Results of a Fluid Actuated Morphing Winglet Trailing Edge

Keimer, Ralf and Schäfer, Michael and Vasista, Srinivas (2024) Experimental Results of a Fluid Actuated Morphing Winglet Trailing Edge. ICAST 2024 - The 33rd International Conference on Adaptive Structures and Technologies, 2024-05-20 - 2024-05-22, Atlanta, USA.

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Abstract

Designing active control surface technology into thin regions of aircraft wings is challenging due to small available volumes. To be able to do so is potentially beneficial to enable more efficient wing designs using morphing for e.g. load alleviation. This paper details a winglet trailing edge surface composed of fluid actuated morphing unit structures (FAMoUS) that enable control surface deflections under the corresponding aerodynamic hinge moments. These FAMoUS actuators are comprised of elastomer and metallic stiffeners, which under internal pressure from a fluid exert displacement and force and thus output work. Combining these unit structures in a bimorph setup a trailing edge control surface is build. This paper outlines the design, finite element analyses and manufacturing process of a demonstrator with 1 m span-width. These finite element analyses consist of detailed tuned material parameters obtained from testing on the individual unit structure tests as well as the inclusion of hydrostatic fluid elements to determine effective stiffnesses from the pressure-volume relationship between the housing structure and internal fluid. Manufacturing of the demonstrator is conducted using composite fabrication and machining techniques to ensure that the demanding tolerances and surface qualities are to be maintained. The structural part of the demonstrator is joint with an actuating system, where in combination wíth feedback sensors position control is achieved. The setup of the actuating system is introduced, elucidating the hydraulic system and the overall control design. Experimental results of tests are presented, starting with calibration of the feedback system with an external measurement, also clarifying deflection uniformity along the span of the demonstrator. Further results of deflection performance and deflection rate are presented and compared to the predictions derived from the finite element analyses. The findings are discussed and contextualized. A summary of the results is given and an outlook on the way forward is presented.

Item URL in elib:https://elib.dlr.de/204740/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental Results of a Fluid Actuated Morphing Winglet Trailing Edge
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Keimer, RalfUNSPECIFIEDhttps://orcid.org/0000-0001-9638-4413UNSPECIFIED
Schäfer, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vasista, SrinivasUNSPECIFIEDhttps://orcid.org/0000-0002-7917-6740UNSPECIFIED
Date:20 May 2024
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Morphing, Winglet-Tab
Event Title:ICAST 2024 - The 33rd International Conference on Adaptive Structures and Technologies
Event Location:Atlanta, USA
Event Type:international Conference
Event Start Date:20 May 2024
Event End Date:22 May 2024
Organizer:Georgia Institute of Technology
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Aircraft Systems, L - Structural Materials and Design
Location: Braunschweig
Institutes and Institutions:Institut für Systemleichtbau > Adaptronics
Institute of Flight Systems > Safety Critical Systems&Systems Engineering
Deposited By: Keimer, Ralf
Deposited On:17 Jun 2024 09:19
Last Modified:17 Jun 2024 09:19

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