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Item type:Publication, Access status: without files , Validation of skew detection concepts for future leading-edge slatsAccording 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 Paper47 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Actuation systems for raised Krueger flaps on laminar airfoils(Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. (DGLR), 2024-09); ; 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 Paper26 41 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Systems for fast actuated droop noses and flap-tabs for dynamic load control(2024-01); ; Dynamic load control offers a high potential for the improvement of aerodynamic performance and increase in passenger comfort. However, it is unclear if the implementation is feasible or even possible regarding the actuation system design. The demand of actively reducing gust loads acting on the wing results in challenging requirements for the actuation systems regarding high actuation speeds and loads. In this paper, promising actuation concepts for fast actuated droop noses and flap-tabs will be analysed based on preliminary designs. Furthermore, the impact on the overall system level is discussed.Publicationtype: Conference Paper57 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Virtual testing of skew detection concepts for future leading edge slatsRecent statements by the FAA regarding commercial aircraft certification guidelines indicate that structural elements have to be considered in safety analysis of flight control systems in a wider scope. The monitoring of failure modes within the drivetrain is expanding to include the kinematics and control surface itself. Among other aspects, this leads to implications for the high-lift system, since it is unclear if structural defects can be reliably detected by conventional fault detection systems, such as angle sensors on the drivetrain or torque sensors at the drive unit. Consequently, this has to be investigated and alternative monitoring concepts have to be considered to meet the new requirements. This paper presents a study of a new monitoring concept for future leading edge slat systems using a virtual test environment. Utilizing a co-simulation consisting of MSC Adams for the flexible multibody simulation and Matlab Simulink/Simscape for the modelling of the drive train, the functionality and performance of a use-case monitoring concept for future leading edge slats based on position sensors is investigated based on various test cases.Publicationtype: Conference Paper100 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Efficient Modeling of Unsteady Control Surface Aerodynamics in Transonic Flow for Flight Dynamics Analysis of the Intelligent Wing(2023); ; 51