Modares Mechanical Engineering

Modares Mechanical Engineering

Response regime of nonlinear bistable energy harvester

Author
Alireza Khatami
Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Mazandaran, Iran
Abstract
The effective bandwidth of a bi-stable electromechanical energy harvester is investigated. The Harvester’s configuration is in the form of a cantilever beam in which the piezoelectric layers are attached on its two sides. The whole device undergoes sinusoidal base excitation. In addition an axial force is applied to the end of the beam. Post-buckling is caused by this force and system becomes bistable. The cantilever beam is modeled as a nonlinear Euler-Bernoulli beam and equations of motion are generated using Lagrangian method. The equations then discretize via Assumed Mode method and governing equations are solved via Complexification Averaging solution and compared with numerical results. Different attractors such as periodic, quasi-periodic and chaotic attractors are detected and their relative frequency domains are identified. Using semi-solution method, boundaries of different areas plotted in the base excitation-frequency domain. Finally, Uni-modal and multimodal cases are studied and compared with each other. It is shown that the uni-modal solution does not predict the behavior of the system correctly.
Keywords
nonlinear energy harvesting
bi-stable harvester
Complexification Averaging method

Subjects

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Modares Mechanical Engineering
Volume 18, Issue 5
September 2018
Pages 57-65