Sensitivity analysis of piezoaeroelastic energy harvesters

Abdessattar Abdelkefi, Muhammad R. Hajj, Ali H. Nayfeh

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

We perform a sensitivity analysis of a piezoaeroelastic energy harvester consisting of a pitching and plunging rigid airfoil supported by flexural and torsional springs with a piezoelectric coupling attached to the plunge degree of freedom. We employ the nonintrusive formulation of the polynomial chaos expansion in terms of the multivariate Hermite polynomials to quantify the effects of variations in the load resistance, the eccentricity (distance between the center of mass and the elastic axis), and the nonlinear coefficients of the springs on the harvested power and the pitch and plunge amplitudes. As a first step, the normal form of the dynamics of the system near the Hopf bifurcation is used to select parameters that ensure a supercritical instability and maximize the generated power. The results show that the harvested power can be mostly affected by the eccentricity. Moreover, decreasing the nonlinear coefficient of the torsional spring results in a decrease in the pitch amplitude and an increase in the plunge amplitude and hence the harvested power. These results give guidance for optimizing and assessing the uncertainty in the performance of piezoaeroelastic energy harvesters.

Original languageEnglish
Pages (from-to)1523-1531
Number of pages9
JournalJournal of Intelligent Material Systems and Structures
Volume23
Issue number13
DOIs
StatePublished - Sep 2012

Keywords

  • Hopf bifurcation
  • aeroelasticity
  • energy harvesting
  • piezoelectric material
  • polynomial chaos expansion
  • sensitivity analysis

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