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    Validation of skew detection concepts for future leading-edge slats
    (INSA, 2025-05-21)
    Krall, Konstantin
    ;
    Thielecke, Frank
    According to a policy statement released by the FAA, the safety analysis of flight control systems must be expanded to structural elements for certification of future commercial aircrafts [FAA 15]. This results in new requirements for high-lift systems. Conventional monitoring sensors, such as angular position sensors on the drive shaft or torque sensors at the drive unit, focus on detection of failures in the drivetrain rather than structural defects at the inematics or control surfaces. In a previous paper the authors identified the need for a new monitoring solution to fulfil these new requirements. A high potential concept consisting of position sensors monitoring the kinematic movement was identified via virtual testing. Another promising monitoring concept and the validation of the previously utilized modelling method via a test rig are presented in this paper. For this purpose, the test results for a multitude of failure scenarios are presented, analysed and compared to the findings of the virtual tests. Based on the outcome, additional insights of the validation process will be shared, and the most promising monitoring concept for skew detection will be proposed.
    Publicationtype: Conference Paper
      44
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    Actuation systems for raised Krueger flaps on laminar airfoils
    (Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. (DGLR), 2024-09)
    Krall, Konstantin
    ;
    Böhme, Lutz
    ;
    Thielecke, Frank
    Laminarization of airfoils offers great potential for improving aerodynamic performance and presents a key aspect of research in the optimization of modern commercial aircraft. Still, a challenge to be faced is potential contamination of the wing’s leading edge, which creates turbulence wedges that prevent maintained laminar flow. The raised bull-nose Krueger flap poses a solution to this by shielding the leading edge and thus protecting the wing from contamination. However, an actuation system fulfilling the requirements resulting from this concept is yet to be developed and proven. The aim of this paper is to present a feasible actuation system concept for these control devices, while indicating challenges and limitations.
    Publicationtype: Conference Paper
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