scholarly journals Study on the Output Performance of a Nonlinear Hybrid Piezoelectric-Electromagnetic Harvester under Harmonic Excitation

Acoustics ◽  
2019 ◽  
Vol 1 (2) ◽  
pp. 382-392 ◽  
Author(s):  
Haipeng Liu ◽  
Shiqiao Gao ◽  
Junru Wu ◽  
Ping Li
Keyword(s):  
Resonant Frequency ◽  
Output Power ◽  
Average Output Power ◽  
Energy Harvester ◽  
Harmonic Excitation ◽  
Average Output ◽  
Hybrid Energy ◽  
Output Performance ◽  
Hybrid Energy Harvester ◽  
Nonlinear Hybrid

The nonlinear energy harvester has become a hot topic due to its broad bandwidth and lower resonant frequency. Based on the preliminary test and analyses in our previous work, further analyses and tests on the influence of parameters, including the nonlinear magnetic force of the hybrid energy harvesting structure on its output performance under harmonic excitation, are performed in this paper, which will provide powerful support for structural optimization. For designing a nonlinear piezoelectric-electromagnetic hybrid energy harvester, the state equation of electromechanical coupling, the harmonic response and average output power, voltage, and current of a nonlinear hybrid energy harvester under harmonic excitation are derived by the harmonic balance method. The effects of the excitation acceleration and the external load on the output performance of the nonlinear hybrid energy harvester are verified through experimental tests. The results showed that the output power of the nonlinear hybrid energy harvester increases with the increase in the acceleration of harmonic excitation, and the increase is affected by external load. When the piezoelectric-electromagnetic hybrid harvester operates at the optimal load and the resonant frequency, the average output power reaches its maximum value and the increase of the load of the piezoelectric unit makes the resonant frequency of the energy harvesting system increase. Compared with linear harvesting structures, the nonlinear hybrid harvester has better flexibility of environmental adaptability and is more suitable for harvesting energy in low-frequency environments.

scholarly journals A low-frequency hybrid energy harvester with high output performance

2015 ◽  
Vol 660 ◽  
pp. 012091
Author(s):  
Y Xia ◽  
W Liu ◽  
T Chen ◽  
Z Yang ◽  
P Wang ◽  
...  
Keyword(s):  
Energy Harvester ◽  
Low Frequency ◽  
Hybrid Energy ◽  
Output Performance ◽  
Hybrid Energy Harvester ◽  
High Output

A monostable hybrid energy harvester for capturing energy from low-frequency excitations

2019 ◽  
Vol 30 (18-19) ◽  
pp. 2716-2732 ◽  
Author(s):  
Kangqi Fan ◽  
Jiayu Hao ◽  
Qinxue Tan ◽  
Meiling Cai
Keyword(s):  
Power Unit ◽  
Energy Harvester ◽  
Low Frequency ◽  
Theoretical Models ◽  
Harmonic Excitation ◽  
Hybrid Energy ◽  
Hybrid Energy Harvester ◽  
Electromagnetic Power ◽  
The Individual ◽  
Reliability And Robustness

Efficient energy extraction from ubiquitous low-frequency excitations is still an open problem due to the high challenge in constructing an energy harvester with sufficiently low resonant frequency. To address this problem, this article reports a monostable hybrid energy harvester that consists of a piezoelectric power unit and an electromagnetic power unit. The proposed hybrid energy harvester can capture energy simultaneously from one excitation through the two power units. Theoretical models for the monostable hybrid energy harvester are established, and theoretical results fit well with the experimental measurements. Under a harmonic excitation with amplitude of 0.5 g ( g = 9.8 m/s2), the power output of the monostable hybrid energy harvester is experimentally measured to be 0.39 mW, which is obviously higher than that (piezoelectric unit: 0.25 mW; electromagnetic unit: 0.3 mW) produced by the individual power units when they work separately. More importantly, compared with the linear hybrid energy harvester, the monostable hybrid energy harvester has an operating frequency range that is shifted toward the lower frequency and achieves a slightly enhanced peak power, making the monostable hybrid energy harvester well suited for harnessing low-frequency excitations. In addition, employing two transduction mechanisms to synchronously and parallelly generate electricity from ambient excitations, the monostable hybrid energy harvester may also enjoy improved reliability and robustness.

A nonlinear hybrid energy harvester with high ultralow-frequency energy harvesting performance

Meccanica ◽  
2021 ◽  
Vol 56 (2) ◽  
pp. 461-480
Author(s):  
Kai Wang ◽  
Huajiang Ouyang ◽  
Jiaxi Zhou ◽  
Yaopeng Chang ◽  
Daolin Xu ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Energy Harvester ◽  
Hybrid Energy ◽  
Ultralow Frequency ◽  
Hybrid Energy Harvester ◽  
Nonlinear Hybrid

Investigation of a hybrid piezo-electromagnetic energy harvester

2018 ◽  
Vol 85 (9) ◽  
pp. 541-552 ◽  
Author(s):  
Murugesan Rajarathinam ◽  
Shaikh Faruque Ali
Keyword(s):  
Electromagnetic Induction ◽  
Energy Harvester ◽  
Electrical Energy ◽  
Harmonic Excitation ◽  
Hybrid Energy ◽  
Hybrid Energy Harvester ◽  
Transduction Mechanisms ◽  
Parametric Studies ◽  
Magnetic Mass ◽  
Piezoelectric Harvester

Abstract A hybrid energy harvester combining piezoelectric and electromagnetic transduction mechanisms is designed to scavenge vibration energy. The system comprises of a cantilever beam, a piezoelectric harvester and a magnetic mass hung through a spring at the free end. The beam with piezoelectric harvests electrical energy due to the strain induced in the piezoelectric patch. The hung mass oscillates in and out a solenoid to harvest energy due to electromagnetic induction. The system can generate power from any vertically oscillating vibrating host structure. This paper studies the power harvested from the hybrid harvester under harmonic excitation using experimental and analytical evaluations. Comparisons are made with the standalone piezoelectric and electromagnetic harvester under the same excitation environment. The study shows that the present hybrid harvester can harvest energy at a broad range of frequencies. Furthermore few parametric studies are carried out for understanding the device performance. Finally, the efficiency of the proposed hybrid energy harvester is compared with the existing hybrid energy harvester.

Modeling and Experimental Verification of a Hybrid Energy Harvester Using Piezoelectric and Electromagnetic Technologies

2012 ◽  
Vol 569 ◽  
pp. 529-532 ◽  
Author(s):  
Zhen Long Xu ◽  
Xiao Xi Wang ◽  
Xiao Biao Shan ◽  
Tao Xie
Keyword(s):  
Output Power ◽  
Energy Harvester ◽  
Maximum Output Power ◽  
Experimental Results ◽  
Maximum Output ◽  
Hybrid Energy ◽  
Energy Harvesters ◽  
Hybrid Energy Harvester ◽  
Theoretical Results ◽  
Good Agreement

This paper presents a hybrid energy harvester using piezoelectric (PZT) and electromagnetic (EM) technologies. A mathematical model of the output power for this generator was developed. Experiments were carried out to verify the numerical analysis. The theoretical results were in good agreement with the experimental results. The experimental results showed that the maximum output power of the separate PZT and EM energy harvesters were 0.667 mW and 0.32 mW, while that of the hybrid harvester was 0.845 mW under the vibration acceleration of 9.8 m/s2 at 66 Hz. It shows that the hybrid energy harvester can effectively increase the output power.

Mechanism, theory and application research of a rotating electromagnetic energy harvester suitable for multi-directional excitation

2021 ◽  
Author(s):  
Shengkai Guo ◽  
Shiqiao Gao ◽  
Lei Jin ◽  
Xueda Du ◽  
Zuozong Yin ◽  
...  
Keyword(s):  
Output Power ◽  
Average Output Power ◽  
Energy Harvester ◽  
Walking Speed ◽  
Experimental Testing ◽  
Wearable Devices ◽  
Electromagnetic Energy ◽  
Average Output ◽  
Eccentric Rotor ◽  
Rotor Structure

Abstract Energy harvesting in multi-directional excitation for human wearable devices is a challenge. A rotating electromagnetic energy harvester(REMEH) based on an eccentric rotor structure is proposed in this paper. Two poles of the magnets in REMEH are alternately arranged in a ring. The electrical output characteristics of the energy harvester are analyzed through theoretical, numerical simulation and experimental testing methods based on the establishment of magnetic flux density models, the coil induced voltage, and the excitation direction of the eccentric rotor structure. Theoretical analysis and experimental results show that the design of the eccentric rotor structure is well adapted to multi-directional and irregular excitation. The circular staggered arrangement of the magnets effectively increases the output voltage and output power. The results show that the average output power increases slowly when the walking speed increases from 1km/h to 3km/h, and the average output power increases substantially when the walking speed increases from 3km/h to 5km/h. When the walking speed is 1km/h and 3km/h, the average output power is 0.439mW and 0.638mW, respectively. At a walking speed of 5 km/h, the average output power increases rapidly to 1.68mW, corresponding to a power density of 16.59μW/g. This high-performance energy harvester can provide effective power supply for wearable devices or low-powered sensors.

scholarly journals Power Density Improvement of Piezoelectric Energy Harvesters via a Novel Hybridization Scheme with Electromagnetic Transduction

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 803
Author(s):  
Zhongjie Li ◽  
Chuanfu Xin ◽  
Yan Peng ◽  
Min Wang ◽  
Jun Luo ◽  
...  
Keyword(s):  
Power Density ◽  
Output Power ◽  
Energy Harvester ◽  
Hybrid Energy ◽  
Energy Harvesters ◽  
Piezoelectric Patch ◽  
Piezoelectric Energy ◽  
Electromagnetic Transduction ◽  
Self Powered ◽  
Power Densities

A novel hybridization scheme is proposed with electromagnetic transduction to improve the power density of piezoelectric energy harvester (PEH) in this paper. Based on the basic cantilever piezoelectric energy harvester (BC-PEH) composed of a mass block, a piezoelectric patch, and a cantilever beam, we replaced the mass block by a magnet array and added a coil array to form the hybrid energy harvester. To enhance the output power of the electromagnetic energy harvester (EMEH), we utilized an alternating magnet array. Then, to compare the power density of the hybrid harvester and BC-PEH, the experiments of output power were conducted. According to the experimental results, the power densities of the hybrid harvester and BC-PEH are, respectively, 3.53 mW/cm3 and 5.14 μW/cm3 under the conditions of 18.6 Hz and 0.3 g. Therefore, the power density of the hybrid harvester is 686 times as high as that of the BC-PEH, which verified the power density improvement of PEH via a hybridization scheme with EMEH. Additionally, the hybrid harvester exhibits better performance for charging capacitors, such as charging a 2.2 mF capacitor to 8 V within 17 s. It is of great significance to further develop self-powered devices.

scholarly journals Study of the Properties of a Hybrid Piezoelectric and Electromagnetic Energy Harvester for a Civil Engineering Low-Frequency Sloshing Environment

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 391
Author(s):  
Nan Wu ◽  
Yuncheng He ◽  
Jiyang Fu ◽  
Peng Liao
Keyword(s):  
Output Power ◽  
Energy Harvester ◽  
Civil Engineering ◽  
Maximum Output Power ◽  
Low Frequency ◽  
Electromagnetic Energy ◽  
Maximum Output ◽  
Piezoelectric Film ◽  
Hybrid Energy ◽  
Level Height

In this paper a novel hybrid piezoelectric and electromagnetic energy harvester for civil engineering low-frequency sloshing environment is reported. The architecture, fabrication and characterization of the harvester are discussed. The hybrid energy harvester is composed of a permanent magnet, copper coil, and PVDF(polyvinylidene difluoride) piezoelectric film, and the upper U-tube device containing a cylindrical fluid barrier is connected to the foundation support plate by a hinge and spring. The two primary means of energy collection were through the vortex street, which alternately impacted the PVDF piezoelectric film through fluid shedding, and the electromotive force (EMF) induced by changes in the magnetic field position in the conducting coil. Experimentally, the maximum output power of the piezoelectric transformer of the hybrid energy harvester was 2.47 μW (circuit load 270 kΩ; liquid level height 80 mm); and the maximum output power of the electromagnetic generator was 2.72 μW (circuit load 470 kΩ; liquid level height 60 mm). The low-frequency sloshing energy collected by this energy harvester can drive microsensors for civil engineering monitoring.

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