István Hegedűs’s scientific contributions

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Publications (2)


Interaction of aeroelastic forces and turbulence at flutter onset wind speed
  • Article

April 2013

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12 Reads

Asian Journal of Civil Engineering

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I. Hegedus

The investigation of the self-feeding forces impact on the structural displacements in turbulent wind is presented. This impact is dealt with as a ratio of the displacement variances with and without the self-feeding forces, and a formula is proposed for this ratio on a 2DOF section-model. The paper also presents a method to determine the softness of the flutter that affects significantly the impact of the self-feeding forces over the buffeting forces. This method highlights the influence of the flutter derivatives on how the structural parameters affect the softness.


Fig. 1. Section model with two rotational degrees of freedom: γ and δ  
The sensitivity of the flutter derivatives and the flutter speed to the eccentricity of the cross section
  • Article
  • Full-text available

January 2012

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47 Reads

Periodica Polytechnica Civil Engineering

The flutter instability analysis of a bridge deck is based on flutter derivatives determined by wind tunnel tests on a section model having two degrees of freedom, heave and pitch (hereafter referred to as the heave-pitch model). The imperfections and the eccentricity that arise during the forced sinusoidal vibration of the section yield erroneous derivatives. This paper studies the relationship between these errors and the imperfections. Rotational excitations around two eccentric axes (hereafter referred to as the pitch pitch model) of the section model show that the determined derivatives are less error-prone to imperfections. Determining the derivatives, like angular speed flutter derivative A(2)* for the aeroelastic torsion moment, gives a more accurate value, so the flutter instability analysis yields a more accurate estimate of the flutter wind speed. Numerical values are presented for the case of a thin airfoil and a bluff bridge cross section.

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