@misc{KazulaGrasseltMischkeetal., author = {Kazula, Stefan and Grasselt, David and Mischke, Marcel and H{\"o}schler, Klaus}, title = {Preliminary safety assessment of circular variable nacelle inlet concepts for aero engines in civil aviation}, series = {Safety and Reliability - Safe Societies in a Changing World}, journal = {Safety and Reliability - Safe Societies in a Changing World}, publisher = {Taylor \& Francis Group}, address = {London}, isbn = {978-0-8153-8682-7}, pages = {2459 -- 2467}, abstract = {A safe design process and its application are introduced to a concept study for circular variable aero engine inlets. The paper highlights the tasks of inlets, the compromise in designing them and how using variable inlets could solve this compromise and allow for faster and more efficient commercial aircraft. However, high safety and reliability requirements bring up disadvantages. Tackling these disadvantages, a systems engineering approach is complemented by a safety assessment process, according to Aerospace Recommended Practice ARP 4754A. Safety methods that are applicable during early phases of the product development process are presented and applied to develop feasible variable inlet concepts. Hence, safety requirements, potential failure events and resulting failure modes are systematically identified, assessed and mitigated. The mitigation of a failure condition by the means of redundancy within the adjustment control system is presented.}, language = {en} } @misc{MhadbiMischkeHoeschleretal., author = {Mhadbi, Beya and Mischke, Marcel and H{\"o}schler, Klaus and Huppertz, Andr{\´e}}, title = {Semi-automatische Erstellung parametrisch-assoziativer 3D CAD-Modelle am Beispiel eines Flug-Kerntriebwerks}, series = {Digitalisierung und Produktentwicklung - vernetzte Entwicklungsumgebungen, 16. Gemeinsames Kolloquium Konstruktionstechnik 2018, Bayreuth, Tagungsband}, journal = {Digitalisierung und Produktentwicklung - vernetzte Entwicklungsumgebungen, 16. Gemeinsames Kolloquium Konstruktionstechnik 2018, Bayreuth, Tagungsband}, publisher = {Universit{\"a}t Bayreuth, Lehrstuhl f{\"u}r Konstruktionslehre und CAD}, address = {Bayreuth}, isbn = {978-3-00-059609-4}, pages = {236 -- 243}, abstract = {Zuk{\"u}nftige Produktentwicklungen werden auf multidisziplin{\"a}re Optimierungen eines virtuellen Modells basieren, da nur sie die Interaktionen zwischen den beteiligten Disziplinen ber{\"u}cksichtigen. Beabsichtigt man beispielsweise ein Produkt hinsichtlich seiner aerodynamischen, thermodynami-schen und statisch-dynamischen Eigenschaften zu optimieren, ist es erforderlich, die Generierung der virtuellen Produktgeometrie zu automatisieren und die interessierenden Dimensionen, welche f{\"u}r die o.g. Disziplinen relevant sind, zu parametrisieren, d.h. flexibel zu gestalten und eine potenzielle Ver{\"a}nderung der Morphologie bzw. der Abmessungen vorzusehen. Wie eine flexible, f{\"u}r die Optimierung angemessene Geometrie zu erstellen ist, ist Gegenstand des vorliegenden Artikels. Dabei wird gezeigt, wie ein 3D CAD-Modell ausgehend von einer einfachen 2D Referenzgeometrie, welche aus Grundgeometrien besteht, und von generisch, parametrisch-assoziativen Benutzerformelementen (User-Defined Features, UDFs) zu generieren ist. Der methodische Ansatz wird am Beispiel eines Kerntriebwerks konkretisiert. Der vorgestellte Prozess ist ein Schritt in Richtung einer flexiblen Geometrieerstellung, die die Durchf{\"u}hrung multidisziplin{\"a}rer Optimierung erm{\"o}glicht.}, language = {de} } @misc{KoenigMischkePohletal., author = {K{\"o}nig, Paul and Mischke, Marcel and Pohl, Michael and Kazula, Stefan and H{\"o}schler, Klaus}, title = {Concept Development and Evaluation for a Broadband Noise Absorbing Acoustic Liner Concept for Aviation}, series = {24th International Society For Air Breathing Engines (ISABE-2019-24261), 22.-27. September 2019}, journal = {24th International Society For Air Breathing Engines (ISABE-2019-24261), 22.-27. September 2019}, abstract = {This paper presents design adaptations during the further development of innovative broadband acoustic liner concepts (Foil Helmholtz Resonator Liner; FHR-Liners) which utilise flexible foils within a honeycomb structure to attenuate engine and aircraft noise. The requirements for acoustic liners in aviation are described and utilised to derive evaluation criteria. Modifications of the FHR-Liner concept are introduced. A suitable concept evaluation method based on VDI 2225 is applied to evaluate the modified liner concepts concerning the main evaluation criteria.}, language = {en} } @misc{KazulaMischkeKoenigetal., author = {Kazula, Stefan and Mischke, Marcel and K{\"o}nig, Paul and H{\"o}schler, Klaus}, title = {Evaluation of Variable Pitot Inlet Concepts for Transonic and Supersonic Civil Aviation}, series = {MATEC Web of Conferences : Proceedings of the 9th EASN International Conference on Innovation in Aviation \& Space}, volume = {304}, journal = {MATEC Web of Conferences : Proceedings of the 9th EASN International Conference on Innovation in Aviation \& Space}, issn = {2261-236X}, doi = {10.1051/matecconf/201930402016}, pages = {8}, abstract = {This paper describes the selection of the ideal variable inlet concept group by utilising results of aerodynamic investigations, system safety analyses and integration studies. Aerodynamic and functional inlet requirements are explained and variable inlet concept groups are introduced. The concept evaluation by means of a weighted point rating is presented. The respective concept groups are analysed and evaluated regarding economic, functional and safety requirements. By means of this evaluation, the concept group that adjusts the inlet geometry by rigid segment repositioning is identified as most suitable concept group. The early selection of the most suitable concept group enables more detailed subsequent concept investigations, potentially enabling the technology of variable inlets for future commercial aircraft.}, language = {en} } @inproceedings{MischkeKazulaHoeschler, author = {Mischke, Marcel and Kazula, Stefan and H{\"o}schler, Klaus}, title = {A Comparative Concept Study and Evaluation for New Broadband Noise Absorbing Acoustic Liner Concepts for Civil Aviation}, series = {Proceedings of Global Power and Propulsion Society, Technical Conference 2019, Zurich}, booktitle = {Proceedings of Global Power and Propulsion Society, Technical Conference 2019, Zurich}, pages = {1 -- 9}, abstract = {This paper presents an approach to product rating and evaluation of different product solutions for broadband attenuation acoustic liner concepts for aerospace application. In the process, corresponding requirements have been defined for the considered system and evaluation criteria have been derived. Three "Main Evaluation Categories" (Acoustics, System Safety and Integration, Structure and Material) have been introduced to not falsify the assessment results by subject-specific exclusion criteria. A ranked space method has been selected for weighting the evaluation criteria to ensure an objective and knowledge-based rating. The rating has been carried out by a weighted point rating. Concise operational requirements and previously not considered system functions have been identified and linked to the rating and evaluation process. Building on this, further steps for the optimisation and development of the acoustic liner concepts have been presented and explained.}, language = {en} } @misc{MischkePohlHoeschleretal., author = {Mischke, Marcel and Pohl, Michael and H{\"o}schler, Klaus and Huppertz, Andr{\´e}}, title = {GAS PATH DESIGNER - zeiteffiziente Vorauslegung von Triebwerks-Ringr{\"a}umen und zus{\"a}tzlichen Strukturen}, series = {Conference Paper des Deutscher Luft- und Raumfahrtkongress 2020}, volume = {Deutscher Luft- und Raumfahrtkongress 2020}, journal = {Conference Paper des Deutscher Luft- und Raumfahrtkongress 2020}, publisher = {Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth e.V.}, address = {Bonn}, doi = {https://doi.org/10.25967/530098}, url = {http://nbn-resolving.de/urn:nbn:de:101:1-2020121112494640076557}, pages = {10}, abstract = {Der Beginn einer jeden Triebwerksentwicklung startet mit der Auslegung des Ringraumes des Prim{\"a}rgasstromes. Hier m{\"u}ssen einige vorl{\"a}ufige aber auch grundlegende Entscheidungen zu Entwurfsparametern wie Eintrittsquerschnitte, Subsysteml{\"a}ngen, axiale Stufenanzahl in Verdichter und Turbine, usw. definiert werden. F{\"u}r die Vorauslegung sollte die Palette an anf{\"a}nglichen Entwurfsparametern so gering wie m{\"o}glich gehalten werden, um die Menge an m{\"o}glichen Ringraumentw{\"u}rfen nicht fr{\"u}hzeitig einzuschr{\"a}nken. Dieses Paper pr{\"a}sentiert das Vorauslegungswerkzeug „Gas Path Designer" (GPD), welches in der Lage ist Ringraumentw{\"u}rfe f{\"u}r Turbotriebwerke {\"u}ber zeiteffiziente Berechnungsmethoden in k{\"u}rzester Zeit bereitzustellen. Das Interface bietet eine Auswahl an Einstellungen, um die genannten Variationsm{\"o}glichkeiten zu unterst{\"u}tzen. Der Aufbau ist {\"u}bersichtlich, um im Rahmen grundlegender konzeptorientierter Gespr{\"a}che mit dem Kunden eine schnelle und beidseitig nachvollziehbare Variation und Visualisierung des Konzeptentwurfes zu erm{\"o}glichen. Des Weiteren k{\"o}nnen die erhaltenen Ringraumstrukturen der Triebwerksentw{\"u}rfe als Leitstruktur f{\"u}r CAD-Programme sowie weiterf{\"u}hrende Optimierungsstrategien genutzt werden.}, language = {de} } @inproceedings{SainHoeschlerMischke, author = {Sain, Chetan Kumar and H{\"o}schler, Klaus and Mischke, Marcel}, title = {Concept study of variable area fan nozzle for UHBPR turbofan engine}, series = {22nd International Symposium on Air Breathing Engines (ISABE-2015-20213), 25.-30. Oktober 2015, Phoenix (AZ, USA)}, booktitle = {22nd International Symposium on Air Breathing Engines (ISABE-2015-20213), 25.-30. Oktober 2015, Phoenix (AZ, USA)}, publisher = {ISABE}, pages = {8}, language = {en} } @misc{MischkePohlHoeschleretal., author = {Mischke, Marcel and Pohl, Michael and H{\"o}schler, Klaus and Huppertz, Andr{\´e}}, title = {A Holistic Approach for the Generic Preliminary Design of Axial Compressor and Turbine Annulus Contours}, series = {Conference Paper of the DLRK 2020}, volume = {Deutscher Luft- und Raumfahrtkongress 2020}, journal = {Conference Paper of the DLRK 2020}, publisher = {Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth e.V.}, address = {Bonn}, doi = {https://doi.org/10.25967/530097}, url = {http://nbn-resolving.de/urn:nbn:de:101:1-2020121112463561159960}, pages = {12}, abstract = {An essential aspect in the whole engine modelling of modern aircraft engines is the preliminary design of the meridional gas path definition. Especially the annulus dimensioning and topological characterisation of engine core subsystems are usually time-consuming. This paper presents a holistic and parametric approach to predesign the geometric 2D annulus contours of compressor and turbine subsystems without complex thermodynamic calculations. It is based on distribution functions of the axial and radial dimensions, as well as the variations of compressor and turbine stages and realises a time-efficient re-dimensioning and topological variation of the complex annulus geometry. Parametric methods for an optimised arrangement of the blade stages in a turbomachinery subsystem configuration are shown and integrated into a mathematical model.}, language = {en} } @misc{MischkeKazulaHoeschler, author = {Mischke, Marcel and Kazula, Stefan and H{\"o}schler, Klaus}, title = {Preliminary Safety Assessment on System Design Level for Broadband Acoustic Liner Concepts for Aviation}, series = {Proceedings of the 9th EASN International Conference on Innovation in Aviation \& Space}, journal = {Proceedings of the 9th EASN International Conference on Innovation in Aviation \& Space}, address = {Athen}, doi = {10.1051/matecconf/201930404010}, pages = {8}, abstract = {Selected methods of the aviation safety assessment process according to ARP 4761 are introduced and conducted within the scope of a concept study for future broadband acoustic liners. While having similar primary functions and basic design, the acoustic liner concepts diverge concerning subfunctions and potential malfunctions. With the ARP 4761 safety assessment methods, significant differences in sub functions and possible malfunctions of the concepts can be identified. The results of the safety assessment are discussed, and the concepts are evaluated in terms of feasibility and safety.}, language = {en} }