2021/01/11 by Rocco Bombardieri, Rauno Cavallaro, Bombardieri, Rocco +5
Engineering · Physics and Astronomy · #Aerodynamic force #Aerodynamics #Aeroelasticity #Aeroelasticity and Vibration Control #Aerospace engineering #Aircraft flight mechanics #Composite Structure Analysis and Optimization #Computer science #Control theory (sociology) #Dynamics and Control of Mechanical Systems #Engineering #Flight envelope #Flutter #Longitudinal static stability #Modal #Structural engineering #Vehicle Dynamics and Control Systems #Vibration Control and Rheological Fluids #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.2101.04087
published in arXiv (Cornell University) (Cornell University)
arxiv created 2021/01/11 · openalex publication_date 2021/01/11 · arxiv updated 2021/01/12 · openalex created_date 2022/07/25 · openalex updated_date 2026/08/05
The PrandtlPlane aircraft has been recently considered as a possible\ncandidate to foster the ambition of a greener aviation. Despite the relevant\namount of research carried out in the last years, several aspects of this novel\nconfiguration still need further insight to pave the way to future\napplications. Among them, the coupled flight-dynamic and aeroelastic response\nis addressed in this work by means of a dedicated in-house framework. For the\nevaluation of the aerodynamic forces, an enhanced Doublet Lattice Method, able\nto take into account terms typically neglected by classic formulations, is\nemployed. First, flight-dynamic aspects are considered, showing how effects of\ninteraction between Short Period or Dutch Roll with elastic modes remarkably\ndeteriorate the flying qualities. Then, focus is on the aeroelastic stability\nof the aircraft. As observed also in previous literature efforts on this\nconfiguration, flutter onset is considerably different when considering the\naircraft being free in the air or fixed in space. Thanks to the adopted\nformulation it is shown how, for this PrandtlPlane, the aerodynamic coupling of\nelastic and rigid modes has a beneficial effect on flutter onset. However, the\ndifferent modal properties, consequence of the diverse boundary conditions,\nwhen switching from fixed-in-space to free-flying aircraft, also play a\nrelevant role in determining the occurrence of flutter. Whereas for the\nlongitudinal case both effects contribute increasing flutter speed, for the\nlateral-directional case the variation in modal properties has a detrimental\nand dominating effect, leading to a flutter speedwell within the flight\nenvelope.Finally,the work discusses the contributions of the additional terms\nmodeled by the enhanced Doublet Lattice Method, showing how they induce a\nconsiderable effect when modeling the flight dynamics of the flexible aircraft.\n