@inproceedings{PourtoulidouStegerBurgeretal.2019, author = {Pourtoulidou, Despoina and Steger, Fabian and Burger, Uli and G{\"o}llinger, Harald and K{\"o}nig, Ludwig and Obermeier, Erwin and Schweiger, Hans-Georg and Frey, Andreas}, title = {Mission-framed Project-based Learning and Teaching}, booktitle = {Varietas delectat… Complexity is the new normality: SEFI 47th Annual Conference Proceedings}, subtitle = {integrating an Electric Powertrain into a Motor Glider}, editor = {Nagy, Bal{\´a}zs Vince and Murphy, Mike and J{\"a}rvinen, Hannu-Matti and K{\´a}lm{\´a}n, Anik{\´o}}, publisher = {SEFI}, address = {Br{\"u}ssel}, isbn = {978-2-87352-018-2}, doi = {https://www.sefi.be/proceedings/?conference=2019-budapest-isbn-978-2-87352-018-2}, pages = {879 -- 888}, year = {2019}, language = {en} } @article{RochatBurger2015, author = {Rochat, Ludovic and Burger, Uli}, title = {Aspects of damage tolerance and fatigue of CFRP structural components}, volume = {8}, pages = {2015-01-2596}, journal = {SAE International Journal of Aerospace}, number = {2}, publisher = {SAE}, address = {Warrendale}, issn = {1946-3855}, doi = {https://doi.org/10.4271/2015-01-2596}, pages = {292 -- 302}, year = {2015}, language = {en} } @article{WagnerHeimbsFrankeetal.2018, author = {Wagner, Tim and Heimbs, Sebastian and Franke, Florian and Burger, Uli and Middendorf, Peter}, title = {Experimental and numerical assessment of aerospace grade composites based on high-velocity impact experiments}, volume = {2018}, journal = {Composite Structures}, number = {204}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0263-8223}, doi = {https://doi.org/10.1016/j.compstruct.2018.07.019}, pages = {142 -- 152}, year = {2018}, language = {en} } @article{FrankeSchwabBurgeretal.2021, author = {Franke, Florian and Schwab, Michael and Burger, Uli and H{\"u}hne, Christian}, title = {An analytical model to determine the impact force of drone strikes}, volume = {13}, journal = {CEAS Aeronautical Journal}, number = {1}, publisher = {Springer}, address = {Wien}, issn = {1869-5590}, doi = {https://doi.org/10.1007/s13272-021-00552-4}, pages = {69 -- 84}, year = {2021}, abstract = {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.}, language = {en} } @article{WagnerHeimbsBurger2019, author = {Wagner, Tim and Heimbs, Sebastian and Burger, Uli}, title = {A simplified and semi-analytical bolted joint model for crash and impact simulations of composite structures}, volume = {2020}, pages = {111628}, journal = {Composite Structures}, number = {233}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0263-8223}, doi = {https://doi.org/10.1016/j.compstruct.2019.111628}, year = {2019}, language = {en} } @inproceedings{FrankeBurgerHuehne2021, author = {Franke, Florian and Burger, Uli and H{\"u}hne, Christian}, title = {Investigation of impacts between unmanned aerial vehicle motors and various targets}, booktitle = {Aerospace Europe Conference 2021}, publisher = {Polish Society of Aeronautics and Astronautics}, address = {Warschau}, url = {https://psaa.meil.pw.edu.pl/AEC2021/Papers/AEC_2021_111_Franke_Florian.pdf}, year = {2021}, language = {en} } @inproceedings{FrankeBurgerHuehne2021, author = {Franke, Florian and Burger, Uli and H{\"u}hne, Christian}, title = {Models and Methods for Drone Strike Load Predictions}, booktitle = {ICAS 2020/21 Proceedings}, publisher = {International Council of the Aeronautical Sciences (ICAS)}, address = {Bonn}, isbn = {978-3-932182-91-4}, url = {https://www.icas.org/ICAS_ARCHIVE/ICAS2020/data/preview/ICAS2020_0019.htm}, year = {2021}, language = {en} } @inproceedings{BurgerFrankeSchwabetal.2019, author = {Burger, Uli and Franke, Florian and Schwab, Michael and Engleder, Alexander and Eberth, Ulrich}, title = {Evaluation of collisions with small unmanned aerial vehicles and their consequences to rotorcraft}, booktitle = {75th Annual Vertical Flight Society Forum and Technology Display (FORUM 75): The Future of Vertical Flight, Volume 2 of 5}, publisher = {Curran Associates}, address = {Red Hook}, isbn = {978-1-5108-8791-6}, url = {https://vtol.org/store/product/evaluation-of-collisions-with-small-unmanned-aerial-vehicles-and-their-consequences-to-rotorcraft-14552.cfm}, pages = {1294 -- 1304}, year = {2019}, language = {en} } @article{FrankeBurgerHuehne2023, author = {Franke, Florian and Burger, Uli and H{\"u}hne, Christian}, title = {A novel reduced order model for drone impacts with aircraft structures}, volume = {14}, journal = {CEAS Aeronautical Journal}, number = {2}, publisher = {Springer}, address = {Wien}, issn = {1869-5590}, doi = {https://doi.org/10.1007/s13272-023-00646-1}, pages = {381 -- 412}, year = {2023}, abstract = {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.}, language = {en} } @inproceedings{FrankeSchwabEnglederetal.2018, author = {Franke, Florian and Schwab, Michael and Engleder, Alexander and Burger, Uli}, title = {Impact scenarios for collisions with Unmanned Aerial Vehicles and their consequences to rotorcraft}, booktitle = {44th European Rotorcraft Forum 2018 (ERF), Delft, The Netherlands, 18 - 21 September 2018, Volume 1 of 2}, publisher = {Netherlands Association of Aeronautical Engineers}, address = {Amsterdam}, isbn = {978-1-5108-7964-5}, url = {http://hdl.handle.net/20.500.11881/3941}, year = {2018}, language = {en} } @inproceedings{FrankeSlowikBurgeretal.2021, author = {Franke, Florian and Slowik, Thomas and Burger, Uli and H{\"u}hne, Christian}, title = {Numerical Investigation of Drone Strikes with Various Aircraft Targets}, pages = {AIAA 2022-2603}, booktitle = {AIAA SciTech 2022 Forum: January 3-7, 2022, San Diego, virtual}, publisher = {AIAA}, address = {Reston}, isbn = {978-1-62410-631-6}, doi = {https://doi.org/10.2514/6.2022-2603}, year = {2021}, language = {en} }