Abstract
Broadband structural vibration can be suppressed through the connection of an electrical impedance to the terminals of a bonded piezoelectric transducer. This is referred to as piezoelectric shunt damping. Good nominal damping performance has been obtained with resonant shunts, but these shunts are highly sensitive to variations in structural resonance frequencies. In this paper, we present an online tuned multi-mode resonant shunt controller. For optimal tuning, the parameters of this shunt are adjusted online by minimizing the relative phase difference between a vibration reference signal and the shunt current. Experiments validate the proposed technique and demonstrate the simplicity of implementation. The tuning law converges quickly and maintains optimal performance in the presence of environmental uncertainties.
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