Wind pressures measurement on end-cell-induced vibration of a cantilevered circular cylinder

In the case of a circular tower with high aspect ratio, “end-cell-induced vibration (ECIV)” occurs at a wind speed a few times higher than the occurrence wind speed of the vortex-induced vibration (J. Fluids Struct. 13 (1999) 499–518). In order to elucidate the characteristics of aerodynamic forces due to “tip-associated vortices (TAV)” which are considered as the cause of ECIV, wind pressure acting on a rigid circular tower are measured. Proper orthogonal decomposition applied to the pressure data clarifies the structure of the fluctuating pressures due to TAV and the results of wavelet analyses indicate “non-alternate generation” of them.