Estimation of Resonant Piezoelectric Shunt Parameters from Stochastic Subspace Identification

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A resonant piezoelectric shunt is an effective passive vibration mitigation technique, but its performance is highly sensitive to accurate tuning of the electrical parameters. This work presents a method to identify shunt parameters using operational modal analysis based on a single voltage measurement. Stochastic Subspace Identification is employed to extract the modal frequency and damping of the coupled electromechanical system, from which inductance and resistance are retrieved through analytical relations. The approach is validated numerically, together with a Monte Carlo uncertainty analysis to quantify parameter confidence. Experimental tests on a shunted composite blade confirm the ability of the method to precisely recover electrical parameters from a single voltage signal measured under operational conditions.

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