音響刺激による橋梁断面の剥離せん断層不安定性増幅に関する研究

Abstract

The mechanism of vortex-induced oscillation of bluff section is closely related with the instability of separated shear around its body. The shear layer can be easily stimulated by self-movement of the body or external disturbance such as flow perturbation, applied sound with a specified frequency fluctuation and so on.In this study, the investigation of vortex-induced oscillation for 2-D rectangular section was performed by the way of shear layer instability stimulation by applying sound. Furthermore, geometrical shape effect on the response characteristics of the vortex-induced oscillation of edge girder bridge section was also investigated on the basis of applied sound technique.Additionally, the effect of turbulence on vortex-induced oscillation was fundamentally investigated by use of applied sound technique from the turbulent frequency effect point of view.