A study on wake-galloping employing full aeroelastic twin cable model

Abstract The basic aerodynamic characteristics of twin cable were investigated through a series of wind tunnel tests employing full aeroelastic twin cable model. The cable arrangement employed here is characterized by W / D ratio that varies from 4.3 to 8.7 (where W is the spacing of centers of cables, D is the diameter of the cable), namely corresponds to the value between the critical condition of `wake-galloping’ and the so-called `wake induced flutter’. Consequently, in the case where W / D equals 4.3, though typical wake-galloping vibration was observed, relatively small additional damping was effective to mitigate the vibration. In the cases where W / D is larger than 6.5, the model was found to be stable. Moreover, dominant vibratory axis of the leeward cable was found to be dependent on both Reynolds number and reduced wind speed, through the investigation changing the natural frequency of the cable model.