Suppression of aeroelastic vibration of shallow rectangular prism due to its horizontal plates on both ends

For suppression device of aerodynamic vibration, there is a technique of installing the additional members such as fairing, flap and horizontal plate in a current bridge design. The horizontal plate was focused as the additional members, which is a simple structure and highly effective to suppress aerodynamic vibration. However, at the present time, its detail mechanism is not yet elucidated on suppressing aerodynamic vibration. Therefore, the examination of a basic section was conducted at first to obtain the basic effect of the horizontal plate on suppression of aerodynamic vibrations. In this study, the flow visualization, the measurements of the aerodynamic response in torsional vibration and three components of aerodynamic force, and the wind speed measurement by PIV were conducted. As a result of three tests, it was confirmed that aerodynamic instability could be improved by installing the horizontal plates in the appropriate position.