Jürgen Schöftner, Gerda Buchberger,
"A contribution on the optimal design of a vibrating cantilever in a power harvesting application - Optimization of piezoelectric layer distributions in combination with advanced harvesting circuits"
, in Engineering Structures, www.elsevier.com, Seite(n) 92-101, 3-2013, ISSN: 1873-7323
A contribution on the optimal design of a vibrating cantilever in a power harvesting application - Optimization of piezoelectric layer distributions in combination with advanced harvesting circuits
Sprache des Titels:
The present paper focuses on the optimization of a vibrating cantilever beam in a power harvesting application
studying different distributions of piezoelectric layers and attached electric circuits. In the first
part of the contribution, the governing motions of a slender beam with piezoelectric layers are presented.
Then the basic equations of three commonly accepted interface circuits are presented: a standard interface
circuit, a synchronized switching circuit with inductance (SSHI) and a circuit consuming energy
through the synchronous charge extraction technique (SCE). In the case study, a cantilever beam is studied,
which is excited by a uniformly distributed quasi-harmonic lateral force. In a first step the presented
theory for a laminated piezoelastic Bernoulli?Euler beam is validated by three-dimensional, electromechanically
coupled finite element results with ANSYS. Then the verified model is used to compare the dissipated
energy for the different layer distributions (discretized by a parabolic, a linear and a constant
distribution) and for the three interface circuits. The ratio of the dissipated energy between a beam with
parabolically distributed piezoelectric layers and a beam with space-wise constant layers is 2:1. The configuration
with the SCE-circuit as the electric network and the layers distributed according to the parabolic
function is the most efficient.