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A novel inertial energy harvester using magnetic shape memory alloy

Askari Farsangi, M. A ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1088/0964-1726/25/10/105024
  3. Publisher: Institute of Physics Publishing , 2016
  4. Abstract:
  5. This paper studies the output voltage from a novel inertial energy harvester using magnetic shape memory alloys (MSMAs). The MSMA elements are attached to the root of a cantilever beam by means of two steps. In order to get electrical voltage, two coils are wound around the MSMAs and a shock load is applied to a tip mass at the end of the beam to have vibration in it. The beam vibration causes strain in the MSMAs along their longitudinal directions and as a result the magnetic flux alters in the coils. The change of magnetic flux in the surrounding coil produces an AC voltage. In order to predict the output voltage, the nonlinear governing equations of beam motion based on Euler-Bernoulli model and von Kármán theory are derived. A thermodynamics-based constitutive model is used to predict the nonlinear strain and magnetization response of the MSMAs. Also, the induced voltage during martensite variant reorientation in MSMAs is investigated with the help of Faraday's law of induction. Finally, the effect of different parameters including bias magnetic field, pre-strain and number of MSMA elements are investigated in details. The results show that this novel energy harvester has the capability of using as an alternative to the current piezoelectric and magnetostrictive ones for harvesting energy from ambient vibration. © 2016 IOP Publishing Ltd
  6. Keywords:
  7. cantilever beam ; inertial energy harvester ; magnetic shape memory alloy ; shock load ; Cantilever beams ; Composite beams and girders ; Energy harvesting ; Equations of motion ; Magnetic flux ; Magnetism ; Nanocantilevers ; Nonlinear equations ; Thermodynamics ; Euler Bernoulli model ; Inertial energy ; Longitudinal direction ; Magnetic shape memory alloy (MSMAs) ; Magnetic shape memory alloys ; Magnetization response ; Martensite variant reorientations ; Shape memory effect
  8. Source: Smart Materials and Structures ; Volume 25, Issue 10 , 2016 ; 09641726 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/0964-1726/25/10/105024/meta;jsessionid=1EBA5CCE16010B4D365AC8124E2EA8FF.c1.iopscience.cld.iop.org