The fan of an aeronautic engine may experience aeroelastic instabilities called flutter. This phenomenon is the source of large vibrations which can lead to fatigue and even fracture. Moreover, this instability can be triggered by acoustics. By vibrating, the fan emits acoustic waves that propagate within the air intake under specific conditions. T...
This paper aims at introducing a new methodology to analyse aeroelastic stability of transonic fans while nonlinear friction on contact interfaces is taken into account. This methodology consists in an iterative procedure where the nonlinear dynamics of the structure and aerodynamic forces are respectively computed while imposing each one to the ot...
This work concerns the numerical modeling of geometric nonlinear vibrations of slender structures in rotation using an original reduced order model based on the use of dual modes along with the implicit condensation method. This approach is an improvement of the classical ICE method in the sense that the membrane stretching effect is taken into acc...
V magistrskem delu analitično in numerično obravnavamo stabilnost poenostavljenega mehanskega modela letalskega krila v odvisnosti od hitrosti zračnega toka krila oziroma dinamičnega tlaka, ki deluje na krilo. Iščemo mejni dinamični tlak, pri katerem obravnavan sistem preide iz stabilnega v nestabilno območje. V delu predstavimo reševanje problema ...
The present thesis discusses the forced response of a rotor’s bladed-disk when excited by the periodic force produced by a wake generator, or Inlet Guide Vane (IGV),with 8 equally-spaced blades. These components are part of an axial transonic compressor rig, moreover the Transonic Compressor Darmstadt 1 (TCD1), located at the Technical University o...
Efficient orbital launch vehicles require a weight-optimized structure that can reliably withstand severe aerothermodynamic loads. The relevant loads, which are crucial for the design of such light-weight structures, can depend on the interaction of the thermal and deformation state of the structure with the surrounding flow field. This is referred...
The reduction of loads, ultimately leading to a weight reduction and thus an increase in aircraft performance, plays an important role in the design of modern aircraft. To this end, two aeroelastic tailoring methodologies, independently developed at ONERA and DLR and aiming at load reduction by means of a sophisticated application of composite mate...
When designing an airborne wind energy system, it is necessary to be able to estimate the traction force that the kite produces as a function of its flight trajectory. Being a flexible structure, the geometry of a soft kite depends on its aerodynamic loading and vice versa, which forms a complex fluid-structure interaction (FSI) problem.
Currently, ...
Published in Bioinspiration & Biomimetics
A flexible foil undergoing pitching oscillations is studied experimentally in a wind tunnel with different imposed free stream velocities. The chord-based Reynolds number is in the range 1600–4000, such that the dynamics of the system is governed by inertial forces and the wake behind the foil exhibits the reverse Bénard–von Kármán vortex street ch...
Published in Journal of Physics: Conference Series
The present study investigates stall-induced vibrations on a IEA-15-RWT wind turbine blade. At standstill and under specific strong crosswind conditions, simulations using the codes OpenFAST and DeepLines WindTM exhibit large-amplitude vibrations. Results of both codes are first compared, showing an overall good agreement. Then, the influence of th...
