Abstract
Galfenol traditional cantilever energy harvesters (TCEHs) have bigger electrical output only at resonance and exhibit nonlinear mechanical-magnetic-electric coupled (NMMEC) behaviors. To increase low-frequency broadband performances of a TCEH, an improved CEH (ICEH) with magnetic repulsive force is studied. Based on the magnetic dipole model, the nonlinear model of material, the Faraday law and the dynamic principle, a lumped parameter NMMEC model of the devices is established. Comparisons between the calculated and measured results show that the proposed model can provide reasonable data trends of TCEH under acceleration, bias field and different loads. Simulated results show that ICEH exhibits low-frequency resonant, hard spring and bistable behaviors, thus can harvest more low-frequency broadband vibration energy than TCEH, and can elicit snap-through and generate higher voltage even under weak noise. The proposed structure and model are useful for improving performances of the devices.
Highlights
The magnetostrictive (e.g., Terfenol-D, Galfenol)[1,2,3,4,5] and piezoelectric (PZT)[6,7,8,9] cantilever energy harvesters (CEHs) can replace batteries, and have wide applications in monitors, wireless sensors, and implantable devices, etc
The performance prediction of Galfenol CEHs is complicated because the devices exhibits nonlinear mechanical-magnetic-electric coupled (NMMEC) behaviors.[1,2,3,4,5]
The electromechanical coupled model Eqs. (10), (16), (17), uL=RLi, PL=(uLrms)2/RL and the magnetomechanical coupled model Eqs. (6), (7), (18) compose a lumped parameter NMMEC model of Galfenol CEHs, which is solved by a recursive iteration approach
Summary
The magnetostrictive (e.g., Terfenol-D, Galfenol)[1,2,3,4,5] and piezoelectric (PZT)[6,7,8,9] cantilever energy harvesters (CEHs) can replace batteries, and have wide applications in monitors, wireless sensors, and implantable devices, etc. Different models for Galfenol CEHs are presented, including lumped parameter uncoupled model,[1] finite element uncoupled models[2,3] and distributed parameter coupled model.[4] a NMMEC model, which can describe the effects of the nonlinearities of Galfenol and magnets on the CEHs’ properties, has not been reported. A lumped parameter NMMEC model of the CEHs is founded, and the properties of TCEH and ICEH are compared
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
