Abstract
The self-excited vibration of a slender cantilever beam with a square section was examined experimentally in a uniform smooth wind stream. Five kinds of beams with 200 mm length and 2, 2.5, 3, 3.5, 4 mm square sections were placed vertically in a low turbulent wind tunnel. Galloping oscillation of the beam was measured by use of the Laser-Doppler vibrometer. It was found experimentally that the excited amplitude increased when the wind velocity exceeded a certain value at which vortex shedding frequency equaled the secondorder natural frequency of the cantilever beam. Further, the steady state amplitude was indicated by a curve using a new parameter of wind velocity.
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