ACTIVE CONTROL OF SUPER-TALL STRUCTURE VIBRATIONS UNDER WIND ACTION BY A BOUNDARY-LAYER CONTROL METHOD

The authors have been developing active control methods for suppressin g the aerodynamic vibrations of super-tall structures, like pylons of super-long bridges and super-tall buildings, which will be constructed in the next century. Boundary-layer control by rotating cylinders at the leading edge is treated as an active control method for suppressin g aerodynamic vibrations. Previous wind tunnel tests conducted by usin g a two-dimensional square prism gave good results for suppression of the aerodynamic response due to vortex-excited vibration and galloping . On the basis of the two-dimensional wind tunnel test results, three dimensional wind tunnel tests were conducted. The experimental results had a relatively good agreement between two and three dimensional tes ts.