A flutter-type, nonlinear piezoelectric energy harvester was tested in various combinations of aerodynamic and harmonic base excitation to study its power output and efficiency. The commercial polyvinylidene fluoride film transducer LDT1-028K was used in 33 excitation mode. The aerodynamic excitation was created by a centrifugal fan and the base ex...
Published in Journal of Machinery Manufacture and Reliability
AbstractFlutter of unmanned aircraft at hypersonic speeds is one of the understudied problems facing the designers of hypersonic vehicles. Modern methods for calculating aeroelastic stability either solve simplified versions of real problems (for example, without taking physicochemical phenomena into account) or require high computing power. This p...
Bakalářská práce se zabývá výskytem flutteru na letecké konstrukci. Stručně popisuje přehled aeroelastických sil, podrobněji pak flutter. Práce se zaměřuje na přehled leteckých nehod způsobených flutterem v celosvětovém měřítku napříč všemi kategoriemi letadel. Dále rozebírá statistický vzorek případů výskytu flutteru podle zadaných kritérií. / Thi...
Published in International Journal of Nonlinear Sciences and Numerical Simulation
A nonlinear static aeroelastic methodology based on the coupled CFD/CSD approach has been developed to study the geometrical nonlinear aeroelastic behaviors of high-aspect-ratio or multi-material flexible aerial vehicles under aerodynamic loads. The Reynolds-averaged Navier–Stokes solver combined with the three-dimensional finite-element nonlinear ...
In aviation, using external stores under the wings is a common method of carrying payload or fuel. In some cases, the payload can be rigidly attached to the wing. However, stores must often be ejected during flight for aircraft, such as military type, which carry drop tanks and missiles. This may cause the wing to respond dynamically with increasin...
Aircraft winglets are well-established devices that improve aircraft fuel efficiency by enabling a higher lift over drag ratios and lower induced drag. Retrofitting winglets to existing aircraft also increases aircraft payload/range by the same order of the fuel burn savings, although the additional loads and moments imparted to the wing may impact...
Published in Journal of Applied Mechanics and Technical Physics
AbstractThis paper describes a numerical simulation of vibrations of an elastic rod whose height is significantly greater than its transverse dimension and which is placed perpendicularly to the external flow and rigidly mounted on a substrate. Simulation is carried out in the ANSYS software package using bidirectional coupling technology. The natu...
Published in Mechanics of Solids
Abstract—To study the influence and selection of rational elastic-dissipative parameters for under wing pylon-mounted engine suspension, a mathematical model of aeroelasticity of a large-sized transport aircraft has been developed by taking into account the kinetic moment of the engine rotors and specially designed engine attachment points to the p...
Published in Russian Metallurgy (Metally)
AbstractThe problem of determining the total and generalized aerodynamic forces for an airplane wing during vibrations in a compressible flow with allowance for the real frequencies of its natural vibrations is considered. The need to develop operational numerical methods for solving the problem, which is reduced to a Neumann-type boundary problem ...
Wind turbines are large and complex machines which operate in a highly unsteady environment. Due to the spatially and temporally stochastic nature of the wind resource, a large amount of simulation data is needed when one wants to assess the lifetime of such a machine. Both extreme events, such as storms, strong gusts or significant wind direction ...
