Influence of Flight Control Laws on Structural Sizing of Commercial Aircraft PDF
Preview Influence of Flight Control Laws on Structural Sizing of Commercial Aircraft
Influence of flight control laws on structural sizing of commercial aircraft TU Braunschweig – Niedersächsisches Forschungszentrum für Luftfahrt Berichte aus der Luft- und Raumfahrttechnik Forschungsbericht 2021-19 Influence of flight control laws on structural sizing of commercial aircraft Rahmetalla Nazzeri TU Braunschweig Institut für Flugzeugbau und Leichtbau Diese Arbeit erscheint gleichzeitig als von der Fakultät für Maschinenbau der Technischen Universität Carolo-Wilhelmina zu Braunschweig zur Erlangung des akademischen Grades eines Doktor-Ingenieurs genehmigte Dissertation. Bibliografische Information der Deutschen Nationalbibliothek Die Deutsche Nationalbibliothek verzeichnet diese Publikation in der Deutschen Nationalbibliografie; detaillierte bibliographische Daten sind im Internet über http://dnb.d-nb.de abrufbar. 1. Aufl. - Göttingen: Cuvillier, 2021 Zugl.: (TU) Braunschweig, Univ., Diss., 2021 Diese Arbeit erscheint gleichzeitig als von der Fakultät für Maschinenbau der Technischen Universität Carolo-Wilhelmina zu Braunschweig zur Erlangung des akademischen Grades eines Doktor-Ingenieurs genehmigte Dissertation.n. Herausgeber der NFL Forschungsberichte: TU Braunschweig – Niedersächsisches Forschungszentrum für Luftfahrt Hermann-Blenk-Straße 42 • 38108 BraunschweigBr Tel: 0531-391-9822 • Fax: 0531-391-980422 Mail: [email protected] Internet: www.tu-brraauunschweig.de/nfl © Titelbild: Rahmetalla Nazzeri © CUVILLIER VERLAG, Göttingen 2021 Nonnenstieg 8, 37075 Göttingen Telefon: 0551-54724-0 Telefax: 0551-54724-21 www.cuvillier.de Alle Rechte vorbehalten. Ohne ausdrückliche Genehmigung des Verlages ist es nicht gestattet, das Buch oder Teile daraus auf fotomechanischem Weg (Fotokopie, Mikrokopie) zu vervielfältigen. 1. Auflage, 2021 Gedruckt auf umweltfreundlichem, säurefreiem Papier aus nachhaltiger Forstwirtschaft. ISBN 978-3-7369-7516-3 eISBN 978-3-7369-6516-4 Influence of flight control laws on structural sizing of commercial aircraft VonderFakult¨atfu¨rMaschinenbauder TechnischenUniversita¨tCarolo-WilhelminazuBraunschweig zurErlangungderWu¨rdeeines Doktor-Ingenieurs (Dr.-Ing.) genehmigte Dissertation von: M.Eng. RahmetallaNazzeri aus(Geburtsort): Hamburg eingereichtam: 04.03.2021 mu¨ndlichePru¨fungam: 05.10.2021 Gutachter: Prof. Dr.-Ing. P.Horst Prof. C.Armstrong,PhD 2021 Acknowledgement ThedevelopmentsintheframeofthisPhDthesisaretheresultofacollaborationbetween theInstituteofAircraftDesignandLightweightStructuresoftheTechnischeUniversita¨t BraunschweigandtheFlightPhysicsdepartmentatAirbusinHamburg. In this sense I am very thankful to Prof. Dr.-Ing. Peter Horst and Dr.-Ing. Matthias Hauptwhosupportedmeduringthetimeofthiscollaborativeresearchprojectwiththeir broadknowledgeandexperience. Further I would like to thank Prof. Cecil Armstrong with whom I had several inspir- ingmeetingsduringthetimeofthisPhDthesis. In addition, I am very thankful to Frank Lange, who was a personal mentor with his professional expertise in all matters of loads analysis, and Dr.-Ing. Michael Kordt, who managedthefundingandworkingconditionswithhisvaluablemanagementskills. FurtherIwouldliketothankDr.-Ing.StephanAddenforhiswisdomandexpertiseduring thisPhDthesis. I would like to express my special thanks to Christophe Sebastien who originated the projectthatlaidthefoundationforthisPhD. Finally I am very thankful to my family who supported me with patience during this periodofmyworkingcareer. Abstract The increasing demand for new civil aircraft across established airlines in industrialized countriesandemergingmarketspushesaircraftmanufacturerslikeAirbustodevelopin- novativesolutionsthatleadinparticulartomassreductions,improvedlifttodragratios, higher take-off weight, less fuel consumption and hence less carbon dioxide emissions. Onewaytoachievethesekindsofimprovementsmoreeffectivelyandinlessdevelopment time is the use of multidisciplinary analysis and optimization. Additionally incremental innovation is a driving strategy which intends to incorporate specific solutions for dedi- catedpurposesonexistingaircraftmodels. InthissensetheintentionofthisPhDthesis istodevelopamultidisciplinaryframeworkinordertoquantifytheimpactofloadallevi- ationfunctionparameterchangesonstructuralcomponentslikethewingandfuselagein termsofresultingmasschanges. Forthispurposeexistingin-houseAirbustoolsandself- developed algorithms are implemented into this framework as a whole. The developed iterative process chain covers the loads calculation including an active load alleviation system, a structural assessment of the wing and fuselage components and a dedicated feedback loop in order to update mass and stiffness properties of the loads calculation model. The structural property optimization of the wing is based on a fully stressed design approach while for the weight penalty estimation of the fuselage section internal loads exceedance values are used. Only vertical balanced manoeuvres and continuous turbulence load conditions are taken into account for this specific use case. The study showsthatsignificantmassreductionsareachievablewhileontheotherhandestimated masspenaltiesareirrelevant.
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