TY - JOUR
T1 - Sensitivity analysis of piezoaeroelastic energy harvesters
AU - Abdelkefi, Abdessattar
AU - Hajj, Muhammad R.
AU - Nayfeh, Ali H.
PY - 2012/9
Y1 - 2012/9
N2 - 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.
AB - 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.
KW - Hopf bifurcation
KW - aeroelasticity
KW - energy harvesting
KW - piezoelectric material
KW - polynomial chaos expansion
KW - sensitivity analysis
UR - http://www.scopus.com/inward/record.url?scp=84865465696&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84865465696&partnerID=8YFLogxK
U2 - 10.1177/1045389X12440752
DO - 10.1177/1045389X12440752
M3 - Article
AN - SCOPUS:84865465696
SN - 1045-389X
VL - 23
SP - 1523
EP - 1531
JO - Journal of Intelligent Material Systems and Structures
JF - Journal of Intelligent Material Systems and Structures
IS - 13
ER -