par Mokrani, Bilal 
;Burda, Ioan;Preumont, André
Référence Computational methods in applied sciences, 43, page (133-151)
Publication Publié, 2017
;Burda, Ioan;Preumont, André Référence Computational methods in applied sciences, 43, page (133-151)
Publication Publié, 2017
Article révisé par les pairs
| Résumé : | This paper considers the RL shunt damping of vibration with a piezoelectric transducer of a structure with a variable natural frequency. The inductive shunt damping is notorious for not being robust when the natural frequency of the electrical circuit does not match the natural frequency of the structure. In the proposed implementation, the shunted piezoelectric transducer is supplemented with a small additional one (with open electrodes) measuring the mechanical extension of the structure at the location of the transducer. The adaptation strategy uses the property that, at resonance, the electric charge in the shunted transducer is in quadrature of phase with the mechanical strain at the location of the transducer (i.e. the voltage in the transducer with open electrodes). A Phase Shift to Voltage Converter, inspired from the Phase Locked Loop technique (PLL), is built to evaluate the phase shift between these two signals and to adapt the (synthetic) inductor L via a voltage controlled resistor, involving a photoresistive optoisolator (photoresistor). The proposed strategy is supported by simulations and experimental results. |
