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

The basic aerodynamic characteristics of twin cable were investigated throu gh a series of wind tunnel tests employing full aeroelastic twin cable mode l. The cable arrangement employed here is characterized by W/D ratio that v aries from 4.3 to 8.7 (where W is the spacing of centers of cables, D is th e diameter of the cable), namely corresponds to the value between the criti cal condition of 'wake-galloping' and the so-called 'wake induced flutter'. Consequently, in the case where W/D equals 4.3, though typical wake-gallop ing vibration was observed, relatively small additional damping was effecti ve to mitigate the vibration. In the cases where W/D is larger than 6.5, th e model was found to be stable. Moreover, dominant vibratory axis of the le eward cable was found to be dependent on both Reynolds number and reduced w ind speed, through the investigation changing the natural frequency of the cable model. (C) 2000 Elsevier Science Ltd. All rights reserved.