Vibration Control of a Model Structure of Large Bridge Tower : 3rd Report, Control Effect under Vortex Excitation in a Wind Tunnel

This paper is the 3rd of a 4 report series which proposes an active method for controlling the vibration of main towers of huge bridges due to strong wind. In the first and second report, the modeling procedure and the control strategy based on suboptimal control theory and filter technique are described and verified by simulation and impulse experiments. In this study control experiments in an artificial wind environment are carried out: a scaled bridge tower model is placed in a wind tunnel and excited by turbulent wind flow with speed varying from 0 m/s to 13 m/s. It is confirmed that the first five modes of bending and twisting vibrations are well controlled by the proposed method.