Title :
Analytical techniques for broadband multielectromechanical piezoelectric bimorph beams with multifrequency power harvesting
Author :
Lumentut, Mikail F. ; Francis, Laurent A. ; Howard, Ian M.
Author_Institution :
Dept. of Mech. Eng., Curtin Univ., Perth, WA, Australia
fDate :
11/1/2012 12:00:00 AM
Abstract :
This paper presents the multifrequency responses of multielectromechanical piezoelectric bimorph beams using a novel analytical model based on the closed-form boundary value method reduced from the strong form of Hamiltonian´s principle. The reduced constitutive multielectromechanical dynamic equations for the multiple bimorph beams connected in series, parallel, and mixed series-parallel connections can be further formulated using Laplace transformation to give new formulas for power harvesting multifrequency response functions. The parametric case studies based on the change in geometrical structures of the multiple bimorphs with and without tip masses are discussed to analyze the trend of multifrequency power harvesting optimization under resistive load. Nyquist responses based on varying geometrical structures and load resistances were used to analyze the multifrequency power amplitudes in the complex domain. Overall, the trend of system response using multiple tiers consisting of multiple bimorphs was found to significantly widen the multifrequency band followed by increasing the power amplitudes.
Keywords :
Laplace transforms; boundary-value problems; energy harvesting; frequency response; piezoelectric transducers; Hamiltonian principle; Laplace transformation; Nyquist responses; broadband multielectromechanical piezoelectric bimorph beams; closed-form boundary value method; geometrical structures; load resistances; mixed series-parallel connections; multifrequency power amplitude analysis; multifrequency power harvesting optimization; multiple bimorph beams; power harvesting multifrequency response functions; reduced constitutive multielectromechanical dynamic equations; resistive load; Acoustics; Analytical models; Boundary conditions; Broadband communication; Energy harvesting; Equations; Mathematical model;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2012.2489