Wind tunnel testing of an inclined aeroelastic cable model - Pressure and motion characteristics, Part II

This paper deals with dry cable vibrations in the critical Reynolds number range and the associated wind forcing mechanism. Cable vibrations at high reduced velocities were investigated in the third phase of the experimental campaign at the National Research Council Canada (NRC), in collaboration with the University of Bristol and the University of Stavanger. The study focused on the aeroelastic behaviour of a cable model inclined to the approaching flow at f =60º, 77º and 90º. Both dynamic cable response and surface pressures were recorded simultaneously, in an attempt to bridge the gap between separate data on i) cable aeroelastic response and ii) surface pressures on a fixed cable model, available from two previous test campaigns, see e.g. Cheng et al. (2003) and Larose et al. (2003). This paper presents the main characteristics of the cable vibrations as well as surface pressures throughout the drag crisis range. Further, the interrelation between the simultaneously recorded load and response data is examined, in order to scrutinize the conditions present at the onset of the large response episodes.