Investigation on Aerodynamic Instability of Parallel Circular Cylinders Based on Flutter Analysis

Abstract

The wake galloping appears when  two cylinders are placed close together and the cable vibrates mainly in the vertical direction. The wake-induced flutter is known as a coupled vibration in both vertical and horizontal directions and occurs when the distance between the both cables is far and they are in staggered
arrangement. A series of wind tunnel tests for two parallel cable models with different arrangements have been carried out. Then, it becomes clear the coupling terms which is phase with the displacement of unsteady aerodynamic forces must play vital roles to the wake-induced flutter.