TY - CHAP A1 - Pourtoulidou, Despoina A1 - Steger, Fabian A1 - Burger, Uli A1 - Göllinger, Harald A1 - König, Ludwig A1 - Obermeier, Erwin A1 - Schweiger, Hans-Georg A1 - Frey, Andreas ED - Nagy, Balázs Vince ED - Murphy, Mike ED - Järvinen, Hannu-Matti ED - Kálmán, Anikó T1 - Mission-framed Project-based Learning and Teaching BT - integrating an Electric Powertrain into a Motor Glider T2 - Varietas delectat… Complexity is the new normality: SEFI 47th Annual Conference Proceedings UR - https://www.sefi.be/proceedings/?conference=2019-budapest-isbn-978-2-87352-018-2 KW - Project-based learning KW - Engineering Higher Education Y1 - 2019 UR - https://www.sefi.be/proceedings/?conference=2019-budapest-isbn-978-2-87352-018-2 SN - 978-2-87352-018-2 SP - 879 EP - 888 PB - SEFI CY - Brüssel ER - TY - JOUR A1 - Rochat, Ludovic A1 - Burger, Uli T1 - Aspects of damage tolerance and fatigue of CFRP structural components JF - SAE International Journal of Aerospace UR - https://doi.org/10.4271/2015-01-2596 KW - fuel consumption KW - design processes KW - composite materials KW - helicopters KW - fibers KW - lightweighting KW - fatigue KW - mobility KW - plastics Y1 - 2015 UR - https://doi.org/10.4271/2015-01-2596 SN - 1946-3855 SN - 1946-3901 VL - 8 IS - 2 SP - 292 EP - 302 PB - SAE CY - Warrendale ER - TY - JOUR A1 - Wagner, Tim A1 - Heimbs, Sebastian A1 - Franke, Florian A1 - Burger, Uli A1 - Middendorf, Peter T1 - Experimental and numerical assessment of aerospace grade composites based on high-velocity impact experiments JF - Composite Structures UR - https://doi.org/10.1016/j.compstruct.2018.07.019 Y1 - 2018 UR - https://doi.org/10.1016/j.compstruct.2018.07.019 SN - 0263-8223 VL - 2018 IS - 204 SP - 142 EP - 152 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Franke, Florian A1 - Schwab, Michael A1 - Burger, Uli A1 - Hühne, Christian T1 - An analytical model to determine the impact force of drone strikes JF - CEAS Aeronautical Journal N2 - In addition to the well-known threats of bird and hail strikes, small unmanned aerial vehicles (sUAV) pose a new threat to manned aviation. Determining the severity of collisions between sUAVs and aircraft structures is essential for the safe use and integration of drones in airspace. A generic analytical calculation model needs to be developed to supplement the existing test and simulation data. This paper presents an analytic model for drone collisions with perpendicular and inclined targets. The targets have a rigid or elastic material behavior. The aircraft impact model, which is used for the design of nuclear reactor structures, is transferred and adjusted for sUAV impacts to calculate the impact force. A mass- and a burst load distribution are needed as input parameters. Both distributions are determined for an sUAV design depending on the flight direction. Compared to previous calculations, the new approach is to consider a moving target structure, which produces more realistic results. We compare the calculation results with simulation data from sUAV collisions with a commercial airliner windshield from the literature. The calculations show plausible results and a good agreement with literature data. Subsequently, the influence of the input parameters on the impact force is investigated. We see that spring stiffness, target mass, burst load distribution and damping have minor influence on the overall impact force. The impact velocity, mass distribution and flight orientation on the other hand have a major influence on the impact force. Further tests are needed to validate the impact model. UR - https://doi.org/10.1007/s13272-021-00552-4 KW - Drone collision KW - Unmanned aerial vehicle KW - Analytic approach KW - Impact force KW - Drone strike KW - Numerical calculation Y1 - 2021 UR - https://doi.org/10.1007/s13272-021-00552-4 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-16064 SN - 1869-5590 VL - 13 IS - 1 SP - 69 EP - 84 PB - Springer CY - Wien ER - TY - JOUR A1 - Wagner, Tim A1 - Heimbs, Sebastian A1 - Burger, Uli T1 - A simplified and semi-analytical bolted joint model for crash and impact simulations of composite structures JF - Composite Structures UR - https://doi.org/10.1016/j.compstruct.2019.111628 Y1 - 2019 UR - https://doi.org/10.1016/j.compstruct.2019.111628 SN - 0263-8223 VL - 2020 IS - 233 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Franke, Florian A1 - Burger, Uli A1 - Hühne, Christian T1 - Investigation of impacts between unmanned aerial vehicle motors and various targets T2 - Aerospace Europe Conference 2021 Y1 - 2021 UR - https://psaa.meil.pw.edu.pl/AEC2021/Papers/AEC_2021_111_Franke_Florian.pdf PB - Polish Society of Aeronautics and Astronautics CY - Warschau ER - TY - CHAP A1 - Franke, Florian A1 - Burger, Uli A1 - Hühne, Christian T1 - Models and Methods for Drone Strike Load Predictions T2 - ICAS 2020/21 Proceedings KW - Drone collision KW - Unmanned aerial vehicle KW - Analytic approach KW - Impact force KW - FEM Y1 - 2021 UR - https://www.icas.org/ICAS_ARCHIVE/ICAS2020/data/preview/ICAS2020_0019.htm SN - 978-3-932182-91-4 PB - International Council of the Aeronautical Sciences (ICAS) CY - Bonn ER - TY - CHAP A1 - Burger, Uli A1 - Franke, Florian A1 - Schwab, Michael A1 - Engleder, Alexander A1 - Eberth, Ulrich T1 - Evaluation of collisions with small unmanned aerial vehicles and their consequences to rotorcraft T2 - 75th Annual Vertical Flight Society Forum and Technology Display (FORUM 75): The Future of Vertical Flight, Volume 2 of 5 Y1 - 2019 UR - https://vtol.org/store/product/evaluation-of-collisions-with-small-unmanned-aerial-vehicles-and-their-consequences-to-rotorcraft-14552.cfm SN - 978-1-5108-8791-6 SP - 1294 EP - 1304 PB - Curran Associates CY - Red Hook ER - TY - JOUR A1 - Franke, Florian A1 - Burger, Uli A1 - Hühne, Christian T1 - A novel reduced order model for drone impacts with aircraft structures JF - CEAS Aeronautical Journal N2 - Small unmanned aerial vehicles are a threat for manned aviation. Their increased use by hobby pilots and within the commercial sector has been accompanied by an increase in incidents involving manned aircraft. The problem is that current aircraft structures are designed to resist collisions with birds. They are not designed to withstand drone impacts. The composition of drones differs significantly from previously known load cases. Drones consist of several components with various materials. This means, that there is no analytic model to determine the impact force of such drone strikes with aircraft structures. Within this work, a novel reduced order model for drone impacts is developed. It is validated with high velocity impact test data and explicit finite element simulations. The impact of fragmenting components of the drone are modelled with the aircraft impact model. The impact of non-fragmenting components like motors are described with a spring-mass model. The results show that the approach of superimposing a spring-mass model with the aircraft impact model leads to good results. In case of a rigid target only minor deviations occur within the validity range of the model. Damage and degradation of the target is not included in the model what leads to larger deviations in case of an impact with deformable structures. Nevertheless, the model is very well suited for rapid load estimation and can qualitatively reproduce contact force curves. It can be used for preliminary design of aircraft structures without conducting time and cost intensive tests and simulations. UR - https://doi.org/10.1007/s13272-023-00646-1 KW - Drone collision KW - Unmanned aerial vehicle KW - Analytic approach KW - Impact force KW - Drone strike KW - Numerical calculation Y1 - 2023 UR - https://doi.org/10.1007/s13272-023-00646-1 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-31615 SN - 1869-5590 SN - 1869-5582 VL - 14 IS - 2 SP - 381 EP - 412 PB - Springer CY - Wien ER - TY - CHAP A1 - Franke, Florian A1 - Schwab, Michael A1 - Engleder, Alexander A1 - Burger, Uli T1 - Impact scenarios for collisions with Unmanned Aerial Vehicles and their consequences to rotorcraft T2 - 44th European Rotorcraft Forum 2018 (ERF), Delft, The Netherlands, 18 - 21 September 2018, Volume 1 of 2 Y1 - 2018 UR - http://hdl.handle.net/20.500.11881/3941 SN - 978-1-5108-7964-5 PB - Netherlands Association of Aeronautical Engineers CY - Amsterdam ER - TY - CHAP A1 - Franke, Florian A1 - Slowik, Thomas A1 - Burger, Uli A1 - Hühne, Christian T1 - Numerical Investigation of Drone Strikes with Various Aircraft Targets T2 - AIAA SciTech 2022 Forum: January 3-7, 2022, San Diego, virtual UR - https://doi.org/10.2514/6.2022-2603 Y1 - 2021 UR - https://doi.org/10.2514/6.2022-2603 SN - 978-1-62410-631-6 PB - AIAA CY - Reston ER -