Enhanced performance of magnetoelectric energy harvester based on compound magnetic coupling effect

2015 ◽  
Vol 117 (14) ◽  
pp. 144502 ◽  
Author(s):  
Jinchi Han ◽  
Jun Hu ◽  
Zhongxu Wang ◽  
Shan X. Wang ◽  
Jinliang He
Keyword(s):  
Energy Harvester ◽  
Coupling Effect ◽  
Magnetic Coupling

Dynamic Response of Spiral Cantilever Undergoing Magnetic Coupling

2014 ◽  
Vol 14 (08) ◽  
pp. 1440021
Author(s):  
Xiaoling Bai ◽  
Yumei Wen ◽  
Ping Li ◽  
Jin Yang ◽  
Xiao Peng ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Cantilever Beam ◽  
Magnetic Force ◽  
Coupling Effect ◽  
Magnetic Coupling ◽  
Resonant Frequencies ◽  
Energy Harvesters ◽  
Magnetic Transducer ◽  
Underlying Mechanisms ◽  
Tip Mass

Cantilever beams have found intensive and extensive uses as underlying mechanisms for energy transduction in sensors as well as in energy harvesters. In magnetoelectric (ME) transduction, the underlying cantilever beam usually will undergo magnetic coupling effect. As the beam itself is either banded with magnetic transducer or magnets, the dynamic motion of the cantilever can be modified due to the magnetic force between the magnets and ME sensors. In this study, the dynamic response of a typical spiral cantilever beam with magnetic coupling is investigated. The spiral cantilever acts as the resonator of an energy harvester with a tip mass in the form of magnets, and a ME transducer is positioned in the air gap and interacts with the magnets. It is expected that this spiral configuration is capable of performing multiple vibration modes over a small frequency range and the response frequencies can be magnetically tunable. The experimental results show that the magnetic coupling between the magnets and the transducer plays a favorable role in achieving tunable resonant frequencies and reducing the frequency spacings. This will benefits the expansion of the response band of a device and is especially useful in energy harvesting.

Three-dimensional piezoelectric energy harvester with spring and magnetic coupling

2017 ◽  
Vol 110 (16) ◽  
pp. 163905 ◽  
Author(s):  
Hai Wang ◽  
Feng Hu ◽  
Ke Wang ◽  
Yan Liu ◽  
Wei Zhao
Keyword(s):  
Energy Harvester ◽  
Three Dimensional ◽  
Magnetic Coupling ◽  
Piezoelectric Energy

scholarly journals Magnetic Properties of Ferromagnetic Particles under Alternating Magnetic Fields: Focus on Particle Detection Sensor Applications

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4144 ◽  
Author(s):  
Ran Jia ◽  
Biao Ma ◽  
Changsong Zheng ◽  
Liyong Wang ◽  
Xin Ba ◽  
...  
Keyword(s):  
Magnetic Energy ◽  
Coupling Effect ◽  
Interparticle Distance ◽  
Magnetic Coupling ◽  
Wear Particle ◽  
Effective Field ◽  
Wear Particles ◽  
Force Output ◽  
Field Frequency ◽  
Sensor Applications

The electromagnetic wear particles detection sensor has been widely studied due to its ability to monitor the wear status of equipment in real time. To precisely estimate the change of the magnetic energy of the sensor coil caused by the wear particles, the magnetic property models of wear particles under the alternating magnetic field was established. The models consider the hysteresis effect and the eddy current effect of the wear particles. The analysis and experimental results show that with the increase of the effective field frequency, the change of the magnetic energy caused by the wear particles gradually decrease, which makes the induced electromotive force output by the sensor reduce with the decrease of the particle speed, so a signal compensation method is presented to obtain a unified signal when the same wear particle passing through the sensor in different speeds. The magnetic coupling effect between the two adjacent wear particles is analyzed. The result illustrates that the change of the magnetic energy caused by the dual wear particles system is larger than the sum of the energy variation caused by two independent wear particles, and with the increase of the interparticle distance, the magnetic coupling effect gradually weakens and disappears.

scholarly journals Enhancing Performance of a Piezoelectric Energy Harvester System for Concurrent Flutter and Vortex-Induced Vibration

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3101
Author(s):  
Xiaobiao Shan ◽  
Haigang Tian ◽  
Han Cao ◽  
Tao Xie
Keyword(s):  
Energy Harvester ◽  
Coupling Effect ◽  
Field Application ◽  
Practical Application ◽  
Airflow Velocity ◽  
Velocity Increase ◽  
Vortex Induced Vibration ◽  
Efficient Energy ◽  
Output Performance ◽  
Piezoelectric Energy

This paper proposes a novel and efficient energy harvester (EH) system, for capturing simultaneously flutter and vortex-induced vibration. There exists a coupling effect between flexible spring energy harvester (FSEH) and cantilever beam energy harvester (CBEH) in aerodynamic response and output characteristic. Many prototypes of the harvester were manufactured to explore the coupling effect in a wind tunnel. The experimental results demonstrate that FSEH is mainly subjected to flutter-induced vibration and CBEH undergoes vortex-induced vibration. Disturbance of FSEH first takes place, a limited oscillation cycle then occurs, and chaos ultimately happens as airflow velocity increase. Root mean square voltages are more than 11 V for FSEH at beyond 10.52 m/s, which shows the better output performance over the existing harvesters. Vibration response and output voltage of various harvesters are mutually enhanced with each other. An enhancing ratio for FSEH-130-25 is up to 69.6% over FSEH-130-0, while the enhancing ratio for CBEH-130-30 is 198.3% compared to CBEH-0-30. Field application testing manifests that discharging time to power the pedometer is almost twice as long as the charging one for FSEH-130-25 at 14.48 m/s. The current research offers a suggestive guidance for promoting future practical application in micro airfoil aircrafts.

Janus-like Fe3O4/PDA vesicles with broadening microwave absorption bandwidth

2018 ◽  
Vol 6 (29) ◽  
pp. 7790-7796 ◽  
Author(s):  
Xiaofeng Shi ◽  
Zhengwang Liu ◽  
Wenbin You ◽  
Xuebing Zhao ◽  
Renchao Che
Keyword(s):  
Microwave Absorption ◽  
Coupling Effect ◽  
Magnetic Coupling ◽  
Strong Absorption ◽  
Frequency Range ◽  
Absorption Intensity ◽  
Absorption Bandwidth ◽  
Measured Frequency ◽  
Measured Frequency Range ◽  
Pda Vesicles

Fe3O4/PDA vesicle Janus nanospheres were successfully synthesized, and they exhibited an ultra-wide effective band as wide as 11.6 GHz, covering 73% of the whole measured frequency range (2–18 GHz), and a strong absorption intensity as high as −50.0 dB due to the asymmetric polarization and magnetic coupling effect.

Interlayer magnetic coupling: Effect of alloying in the spacer

1996 ◽  
Vol 54 (6) ◽  
pp. R3738-R3741 ◽  
Author(s):  
J. Kudrnovský ◽  
V. Drchal ◽  
P. Bruno ◽  
I. Turek ◽  
P. Weinberger
Keyword(s):  
Coupling Effect ◽  
Magnetic Coupling ◽  
Interlayer Magnetic Coupling ◽  
Effect Of Alloying

Magnetic coupling effect of Mie resonance-based metamaterial with inclusion of split ring resonators

2015 ◽  
Vol 646 ◽  
pp. 680-684 ◽  
Author(s):  
Ke Bi ◽  
Lingyu Zeng ◽  
Hao Chen ◽  
Chang Fang ◽  
Qingmin Wang ◽  
...  
Keyword(s):  
Coupling Effect ◽  
Magnetic Coupling ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Mie Resonance
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