Transverse Galloping Oscillations

  • H. Sockel
Part of the International Centre for Mechanical Sciences book series (CISM, volume 335)


Transverse galloping oscillations of a linear dynamic structure are nonlinear due to the effect of the fluid force. As comparisons between theoretical and experimental results show, it is adequate to measure the forces on a model in a steady flow and apply the results for the dynamic system. The differential equations for the system can be solved either by using a polynomial expression for the aerodynamic force or by a numerical solution in the phase-plane. It is shown that the usually applied criterion by Den Hartog is not sufficient for stability. The very important influence of turbulence on the stability is shown for rectangular cross-sections. Theoretical and experimental investigations concerning the influence of yaw on the stability show, that the onset wind velocity increases with increasing yaw angle. If the critical galloping wind speed is close to the resonance wind speed, mutual effects of the two phenomena may occur. A structure with closely spaced modal frequencies may vibrate in a multi-mode way or in one mode only, as shown by changing the mass distribution of a bridge tower.


Wind Speed Turbulence Intensity Vortex Resonance Initial Amplitude Separate Shear Layer 


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Copyright information

© Springer-Verlag Wien 1994

Authors and Affiliations

  • H. Sockel
    • 1
  1. 1.Technical University ViennaViennaAustria

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