scholarly journals Magnetic force of piezoelectric cantilever energy harvesting system with an externally applied magnetic field based on magnetizing current method

2015 ◽  
Vol 64 (6) ◽  
pp. 060502
Author(s):  
Tan Dan ◽  
Leng Yong-Gang ◽  
Fan Sheng-Bo ◽  
Gao Yu-Ji
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Applied Magnetic Field ◽  
Magnetic Force ◽  
Current Method ◽  
Piezoelectric Cantilever ◽  
Energy Harvesting System ◽  
Magnetizing Current

The Accurate Analysis of Magnetic Force of Bi-Stable Piezoelectric Cantilever Energy Harvester

2017 ◽  
Author(s):  
Yu-Yang Zhang ◽  
Yong-Gang Leng ◽  
Sheng-Bo Fan
Keyword(s):  
Energy Harvesting ◽  
Calculation Method ◽  
Magnetic Force ◽  
Shape Function ◽  
Accurate Analysis ◽  
Piezoelectric Cantilever ◽  
Calculation Results ◽  
Energy Harvesting System ◽  
Time Position ◽  
The Relationship

In the study of nonlinear bi-stable piezoelectric cantilever energy harvesting system, the accuracy of magnetic force’s calculation on which the potential function and dynamics of the system depend is essential to predict the output response and energy harvesting effect. In this paper, we built a shape function to calculate the trace of the end of the beam with the integral of the entire cantilever beam’s slope, and the magnetic force is consequently derived from the achieved magnets’ real-time position and posture using the magnetizing currents method. With the comprehensive consideration of axial magnetic force and lateral magnetic force, the change of both resultant magnetic force’s value and direction are achieved. The simulation results demonstrate that when the displacement of the magnet at the end of the beam is large enough, the axial and lateral magnetic forces change turn from repulsion to attraction, which leads to a large veer of the direction of resultant magnetic force across two quadrants. And the relationship between magnetic force and interval between two magnets is also achieved. The calculation results of this work are nicely consistent with experimental data. So, the accuracy of this calculation method has been proved to be much higher than the existing calculation method.

scholarly journals Artifacts in magnetic force microscopy under in-plane applied magnetic field: Magnetic bubble as a case study

2020 ◽  
Vol 500 ◽  
pp. 166296
Author(s):  
Ibrahim Cinar ◽  
Daniel Lacour ◽  
Francois Montaigne ◽  
Vito Puliafito ◽  
Sebastien Petit Watelot ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Magnetic Bubble ◽  
Force Microscopy

Design of Piezoelectric Energy Harvesting System by Magnetic Force–Controlled Resonance Frequency

2013 ◽  
Vol 449 (1) ◽  
pp. 24-32 ◽  
Author(s):  
Chan Ho Yang ◽  
Daniel Song ◽  
Min Sik Woo ◽  
Seong Kwang Hong ◽  
Ki Hwan Baek ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Resonance Frequency ◽  
Magnetic Force ◽  
Piezoelectric Energy Harvesting ◽  
Piezoelectric Energy ◽  
Energy Harvesting System

A Microvalve Driven by a Ferrofluid-Based Actuator

2012 ◽  
Vol 433-440 ◽  
pp. 3767-3772 ◽  
Author(s):  
Tong Gang Liu ◽  
Jian Wu ◽  
Cong Xia ◽  
Zi Hang Qian
Keyword(s):  
Magnetic Field ◽  
Fluid Flow ◽  
Applied Magnetic Field ◽  
Driving Force ◽  
Magnetic Force ◽  
Ansys Software ◽  
Electromagnetic Actuation ◽  
Working Principle

A novel ferrofluid-based microvalve adopting an electromagnetic actuation is presented. In the device, ferrofluid controlled by magnetic force is used as a microactuator. The deflection of the diaphragm caused by the ferrofluid-based actuator opens or closes the fluid flow in the microchannel. A detailed description of the design and working principle of the microvalve is presented. The driving force generated by the ferrofluid under applied magnetic field has been measured by a microforce sensor. And the deflection of the diaphragm has been simulated by ANSYS software.

Acceleration Threshold Reduction for Nonlinear Energy Harvesting

2014 ◽  
Vol 14 (08) ◽  
pp. 1440013
Author(s):  
Ji-Tzuoh Lin ◽  
Barclay Lee ◽  
Bruce W. Alphenaar
Keyword(s):  
Energy Harvesting ◽  
Potential Barrier ◽  
Power Output ◽  
Magnetic Force ◽  
Vibration Source ◽  
Nonlinear Coupling ◽  
Acceleration Threshold ◽  
Piezoelectric Cantilever ◽  
Nonlinear Energy ◽  
Good Agreement

Nonlinear coupling of a piezoelectric cantilever to an external magnetic force increases the power harvested from a broadband vibration source for relatively large acceleration vibrations. A threshold exists in the minimum acceleration needed for enhancement of the cantilever response. Below this threshold the nonlinear coupling damps the cantilever motion, and the power output is reduced compared to the noncoupled cantilever. By reducing the size of the coupling magnet, the acceleration required to scavenge usable power can be greatly reduced. The smaller diameter magnet decreases the spatial extent of the magnetic force, reducing the acceleration required to surmount the local potential barrier. The experiments result in a six-fold decrease in the acceleration threshold, to levels comparable to those observed in ambient environmental vibrations. The results are in good agreement with numerical calculations.

Modeling of a Vibration-Based Piezomagnetoelastic Energy Harvesting System by Using the Duffing Equation

2012 ◽  
Author(s):  
Henrik Westermann ◽  
Marcus Neubauer ◽  
Jörg Wallaschek
Keyword(s):  
Energy Harvesting ◽  
Multiple Scales ◽  
Duffing Oscillator ◽  
Harmonic Balance Method ◽  
Equation Of Motion ◽  
Duffing Equation ◽  
Restoring Force ◽  
Piezoelectric Cantilever ◽  
Energy Harvesting System ◽  
Tip Mass

This article illustrates the modeling of a piezomagnetoelastic energy harvesting system. The generator consists of a piezoelectric cantilever with a magnetic tip mass. A second oppositely poled magnet is attached near the free end of the beam. Due to the nonlinear magnetic restoring force the system exhibits two symmetric stable equilibrium positions and one instable equilibrium position. The equation of motion is derived and it is shown that the system can be modeled as Duffing oscillator. An analytical approach is given to derive the Duffing parameters from the system parameters. The Duffing equation is solved for an oscillation around both equilibrium positions by using the harmonic balance method. For small orbit oscillations the equation of motion is solved by applying the fourth-order multiple scales method.

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