Wind engineering paper
Zhai, C, Xu, M, Feng, B, Gan, Y, Hanaor, D 2014, 'Vibration control system with digitally adjustable electromagnetic damping and stiffness', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. II, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 1017-1022. ISBN: 9780994152008.
In this paper, we present an active vibration control system for wind tunnel testing of high-rise buildings. This system was designed with digitally adjustable electromagnetic damping and stiffness, consisting of a sensing module, control centre, power amplifier, and shaking table. The control system was built on the basis of the principle that electrified coils, in a stable magnetic field, generate an electromagnetic force proportional to the current carried. Aeroelastic models of high-rise buildings can be fixed on the shaking table for wind tunnel testing under conditions of different wind speeds and wind directions. The damping and stiffness can be adjusted digitally and a real-time data acquisition and control algorithms were applied to ensure the reliability of the real-time control. This system is well suited for the control of damping and stiffness for vibration frequencies lower than 50 Hz. The control results agreed well with theoretical predictions. The system reported here is beneficial to the study of dynamic behaviour of structures under wind loads.