Broadening the frequency response of a Duffing-type piezoelectric shunt by means of negative capacitance

Author(s)

Mosquera-Sanchez, J. A. ; Alfahmi, O. ; Erturk, A. ; De Marqui Jr, C.

• Document type: Journal article
• Source: Journal of Sound and Vibration; v. 578, p. 14-pg., 2024-02-20.

Abstract

Duffing oscillators are increasingly explored for vibration and noise reduction, owing to their wideband properties and rich dynamic behavior. Applications involving piezoelectric treatments typically take advantage from using negative capacitances, as their effect is similar to enhanced electromechanical coupling. This paper integrates negative capacitance to a recently introduced synthetic impedance -based Duffing -type inductive shunt for frequency bandwidth enhancement. The frequency -domain numerical and experimental results show that, as the negative -topiezoelectric capacitance ratio of the fully digital nonlinear shunt circuit approximates the stability limit, the in -phase and the out -of -phase modes of the Duffing -type shunt become increasingly separated from each other, which enables high-energy branches that are wider than the case without negative capacitance. Under the maximum capacitance ratio attained for two different setups, bandwidth enhancements around 65%-75% have been numerically predicted and experimentally confirmed. This nonlinear piezoelectric shunt with enhanced response is promising for low-level, wideband noise and vibration applications requiring precise parameter tuning, where the sort of input excitation can trigger its broadband, steady-state dynamic responses. (AU)

• FAPESP's process: 20/01608-6 - Nonlinear electroelastic metamaterial for low-frequency, broadband vibration mitigation
• Grantee: Jaime Alberto Mosquera Sánchez
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 18/15894-0 - Periodic structure design and optimization for enhanced vibroacoustic performance: ENVIBRO
• Grantee: Carlos de Marqui Junior
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 18/14546-9 - Control and energy harvesting from low-frequency vibro-acoustic disturbances with smart metastructures
• Grantee: Jaime Alberto Mosquera Sánchez
• Support Opportunities: Scholarships in Brazil - Post-Doctoral