Experimental validation of piezoelectric shunt tuning with residual mode correction: Damping of plate-like structures

Johan Frederik Toftekær*, Jan Becker Høgsberg

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The effective vibration mitigation properties of piezoceramic patches with inductive-resistive shunts are investigated experimentally. A shunt tuning method is proposed, in which a consistent correction for the influence from residual vibration modes is included by an effective modal capacitance, evaluated from measured charge and voltage amplitudes in short- and open-circuit conditions, respectively. The robustness of the proposed method is verified experimentally for both a free beam and a free plate structure with four shunted piezoceramic patch pairs. A stable and fully passive inductor is produced by winding a copper wire around a magnetic core, which requires precise inductance tuning to determine the final number of turns. It is demonstrated that the effective modal capacitance interpolates consistently between the blocked and static capacitances, commonly used for single-mode tuning of piezoelectric inductive-resistive shunts. By imposing pseudo-random vibrations, the piezoelectric current and voltage signals are measured and evaluated by their frequency response functions. Spectrum peak values determine the apparent short-circuit charge to open-circuit voltage ratio for each shunt, which directly determines the shunt components by explicit tuning formulas. Good correlation between numerical and experimental results are obtained for the free beam, while for the free plate experiment effective multi-mode shunt tuning is obtained by a modified effective electromechanical coupling coefficient.
Original languageEnglish
JournalJournal of Intelligent Material Systems and Structures
Volume31
Issue number9
Pages (from-to)220–1239
ISSN1045-389X
DOIs
Publication statusPublished - 2020

Keywords

  • Piezoelectric shunt damping
  • Shunt calibration
  • Residual mode correction
  • Electromechanical coupling coefficient
  • Modal capacitance
  • Experimental validation

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