Abstract
There is concern about the occurrence of in-phase galloping of two parallel cylinders integrated together, such as communication cables. Therefore, it is desirable to take measures to suppress vibration from an aerodynamic point of view. The authors conducted wind tunnel experiments to evaluate the relationship between the arrangement of the two cylinders with different combinations of the diameters and the characteristics of galloping, especially when the distance between the cylinders is small. In addition, the authors calculated the response amplitude using a time response analysis based on a quasi-steady aerodynamic force model and compared it with the results of free vibration experiments to discuss the applicability of the quasi-steady theory. As a result, larger vibrations occurred when the gap between cylinders was small, and the quasi-steady theory was applied to some extent even to the complex structures consisting of two cylinders.
