Abstract
Electrodynamic actuators and electromagnetic dampers (EMD) are used extensively in mechanical systems. They utilise the electromagnetic induction concept to generate eddy current and Lorentz forces for providing vibration suppression forces. In this research, these principles will be developed for vibration serviceability control of a civil engineering structure.
An electrodynamic actuator is used in this research, together with a shunt resonant circuit, an RLC resonant circuit (a simple electronic circuit oscillator) which is needed to cascade with the EMD for closing the circuit and generating electrical damping forces. The EMD is set between the structure and the ground. The kinetic energy of the vibrating structure provides the input energy to activate the EMD.
H ∞ optimisation (minimisation of the maximum response) and H 2 optimisation (minimisation of kinetic energy) are used to obtain the vibration suppression performance, which is compared against a conventional tuned mass damper (TMD). The EMD with shunt resonant circuit (EMDS) can have similar dynamic performance, which achieves suppression of resonant vibration amplitude of the primary structure down to two lower amplitude peaks in the frequency domain. Hence, this work shows that the EMDS can in principle achieve satisfactory vibration suppression performance.
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Acknowledgements
The authors would like to acknowledge the financial assistance provided by the UK Engineering and Physical Sciences Research Council (EPSRC) through a Leadership Fellowship Grant (Ref. EP/J004081/2) entitled “Advanced Technologies for Mitigation of Human-Induced Vibration”.
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Ao, W.K., Reynolds, P. (2015). Analysis of H ∞ and H 2 Optimal Design Scheme for an Electromagnetic Damper with Shunt Resonant Circuit . In: Wicks, A. (eds) Shock & Vibration, Aircraft/Aerospace, and Energy Harvesting, Volume 9. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-15233-2_21
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DOI: https://doi.org/10.1007/978-3-319-15233-2_21
Publisher Name: Springer, Cham
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