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The HIRENASD project: High Reynolds number aerostructural dynamics experiments in the European Transonic Wind Tunnel (ETW) (2006)
Ballmann, Josef ; Dafnis, Athanasios ; Braun, Carsten ; Korsch, Helge ; Reimerdes, Hans-Günther ; Braun, Carsten ; Ballmann, Josef
Impact of aerodynamic interactions on aeroelastic stability of wing-propeller systems (2024)
Böhnisch, Nils ; Braun, Carsten ; Marzocca, Pierre ; Muscarello, Vincenzo
This paper presents initial findings from aeroelastic studies conducted on a wing-propeller model, aimed at evaluating the impact of aerodynamic interactions on wing flutter mechanisms and overall aeroelastic performance. The flutter onset is assessed using a frequency-domain method. Mid-fidelity tools based on the time-domain approach are then exploited to account for the complex aerodynamic interaction between the propeller and the wing. Specifically, the open-source software DUST and MBDyn are leveraged for this purpose. The investigation covers both windmilling and thrusting conditions. During the trim process, adjustments to the collective pitch of the blades are made to ensure consistency across operational points. Time histories are then analyzed to pinpoint flutter onset, and corresponding frequencies and damping ratios are identified. The results reveal a marginal destabilizing effect of aerodynamic interaction on flutter speed, approximately 5%. Notably, the thrusting condition demonstrates a greater destabilizing influence compared to the windmilling case. These comprehensive findings enhance the understanding of the aerodynamic behavior of such systems and offer valuable insights for early design predictions and the development of streamlined models for future endeavors.
The effect of aerodynamic interactions on aeroelastic stability in wing-propeller systems (2024)
Böhnisch, Nils ; Braun, Carsten
This paper presents initial findings from aeroelastic studies conducted on a wing-propeller model, aimed at evaluating the impact of aerodynamic interactions on wing flutter mechanisms and overall aeroelastic performance. Utilizing a frequency domain method, the flutter onset within a specified flight speed range is assessed. Mid-fidelity tools with a time domain approach are then used to account for the complex aerodynamic interaction between the propeller and the wing. Specifically, open-source software DUST and MBDyn are leveraged for this purpose. This investigation covers both windmilling and thrusting conditions of the wing-propeller model. During the trim process, adjustments to the collective pitch of the blades are made to ensure consistency across operational points. Time histories are then analyzed to pinpoint flutter onset, and corresponding frequencies and damping ratios are meticulously identified. The results reveal a marginal destabilizing effect of aerodynamic interaction on flutter speed, approximately 5%. Notably, the thrusting condition demonstrates a greater destabilizing influence compared to windmilling. These comprehensive findings enhance the understanding of the aerodynamic behavior of such systems and offer valuable insights for early design predictions and the development of streamlined models for future endeavors.
Strategies for structural health monitoring implementation potential assessment in aircraft operational life extension considerations (2010)
Kapoor, Hrshi ; Boller, Christian ; Giljohann, Sebastian ; Braun, Carsten
Modelling and optimisation of maintenance intervals to realize structural health monitoring applications on aircraft (2010)
Kapoor, Hrshi ; Braun, Carsten ; Boller, Christian
Development of a modular method for computational aero-structural analysis of aircraft (2010)
Reimer, Lars ; Braun, Carsten ; Wellmer, Georg ; Behr, Marek ; Ballmann, Josef
Computational methods for aero-structural analysis and optimisation of aircrafts based on reduced-order structural models (2009)
Reimer, Lars ; Wellmer, Georg ; Braun, Carsten ; Ballmann, Josef
In this part of the MEGADESIGN project, aeroelastic effects are introduced into the aerodynamic analysis of aircrafts by coupling DLR’s flow solvers TAU and FLOWer to a Timoshenko-beam solver. The emerging aeroelastic solvers and a method for the automatic identification of Timoshenko-beam models for wing-box structures were integrated into a simulation environment enabling the combined optimisation of aerodynamic wing shape and structure.
Ein modulares Verfahren für die numerische aeroelastische Analyse von Luftfahrzeugen (2008)
Braun, Carsten
Computational aeroelastic analysis and design of the HIRENASD wind tunnel wing model and tests (2007)
Reimer, Lars ; Braun, Carsten ; Chen, B.-H. ; Ballmann, Josef
Numerical prediction of aeroelastic effects on twin-sting-rig mounted models for rear fuselage and empennage flow investigation in transonic windtunnel (2007)
Wellmer, Georg ; Chen, B.-H. ; Braun, Carsten ; Ballmann, Josef
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