scholarly journals A High-Efficiency Wind Energy Harvester for Autonomous Embedded Systems

Sensors ◽  
2016 ◽  
Vol 16 (3) ◽  
pp. 327 ◽  
Author(s):  
Davide Brunelli
Keyword(s):  
Embedded Systems ◽  
Wind Energy ◽  
Energy Harvester ◽  
High Efficiency

A high-efficiency multidirectional wind energy harvester based on impact effect for self-powered wireless sensors in the grid

2019 ◽  
Vol 28 (11) ◽  
pp. 115022 ◽  
Author(s):  
Minfeng Tang ◽  
Qihui Guan ◽  
Xiaoping Wu ◽  
Xiaohui Zeng ◽  
Zutao Zhang ◽  
...  
Keyword(s):  
Wind Energy ◽  
Wireless Sensors ◽  
Energy Harvester ◽  
High Efficiency ◽  
Impact Effect ◽  
Self Powered

scholarly journals Harvesting Vibration Energy and Wind Energy by a Bi-stable Harvester: Modeling and Experiments

2021 ◽  
Author(s):  
Haitao Li ◽  
Bojian Dong ◽  
Fan Cao ◽  
Weiyang Qin ◽  
Hu Ding ◽  
...  
Keyword(s):  
Wind Energy ◽  
Energy Harvester ◽  
High Efficiency ◽  
Random Excitation ◽  
Vibration Energy ◽  
Total Output ◽  
Nonlinear Dynamical ◽  
Modeling And Experiments ◽  
Harvesting Efficiency ◽  
Bistable Energy Harvester

Abstract In realistic environments, there often appears the concurrence of base excitation and blowing wind. Harvesting both vibration energy and wind energy by an unique harvester is attractive. In this paper, we proposed a harvester integrating bi-stability and galloping to realize this aim. The nonlinear dynamical model of the bistable energy harvester under concurrent wind and base excitations is established. The galloping effects on the responses are explored based on the established model, for both harmonic and random excitations. The corresponding experiments are conducted to validate the theoretical prediction. The experimental results are consistent with the simulation results. At a wind speed of U=2 m/s, the bandwidth of large-amplitude inter-well motion of the bi-stable energy harvester is extended by about 18.5%. The critical random excitation level for snap-through is reduced by 58% and the total output voltage at random excitation is increased by 53.4%. Thus, the harvester could scavenge the wind and vibration energies at a high efficiency. These conclusions could be helpful for improving the harvesting efficiency in the real environment.

scholarly journals Double-Deck Metal Solenoids 3D Integrated in Silicon Wafer for Kinetic Energy Harvester

Micromachines ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 74
Author(s):  
Nianying Wang ◽  
Ruofeng Han ◽  
Changnan Chen ◽  
Jiebin Gu ◽  
Xinxin Li
Keyword(s):  
Kinetic Energy ◽  
Power Density ◽  
Energy Harvester ◽  
High Efficiency ◽  
Vibrational Energy ◽  
Average Power ◽  
Wafer Level ◽  
Peak Voltage ◽  
Silicon Mold ◽  
Casting Technique

A silicon-chip based double-deck three-dimensional (3D) solenoidal electromagnetic (EM) kinetic energy harvester is developed to convert low-frequency (<100 Hz) vibrational energy into electricity with high efficiency. With wafer-level micro electro mechanical systems (MEMS) fabrication to form a metal casting mold and the following casting technique to rapidly (within minutes) fill molten ZnAl alloy into the pre-micromachined silicon mold, the 300-turn solenoid coils (150 turns for either inner solenoid or outer solenoid) are fabricated in silicon wafers for saw dicing into chips. A cylindrical permanent magnet is inserted into a pre-etched channel for sliding upon external vibration, which is surrounded by the solenoids. The size of the harvester chip is as small as 10.58 mm × 2.06 mm × 2.55 mm. The internal resistance of the solenoids is about 17.9 Ω. The maximum peak-to-peak voltage and average power output are measured as 120.4 mV and 43.7 μW. The EM energy harvester shows great improvement in power density, which is 786 μW/cm3 and the normalized power density is 98.3 μW/cm3/g. The EM energy harvester is verified by experiment to be able to generate electricity through various human body movements of walking, running and jumping. The wafer-level fabricated chip-style solenoidal EM harvesters are advantageous in uniform performance, small size and volume applications.

A piezoelectric wind energy harvester excited indirectly by a coupler via magnetic-field coupling

2021 ◽  
Vol 240 ◽  
pp. 114250
Author(s):  
Junwu Kan ◽  
Weilin Liao ◽  
Shuyun Wang ◽  
Song Chen ◽  
Xin Huang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Wind Energy ◽  
Energy Harvester ◽  
Field Coupling ◽  
Magnetic Field Coupling

scholarly journals Study on the Efficiency and Dynamic Characteristics of an Energy Harvester Based on Flexible Structure Galloping

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6548
Author(s):  
Peng Liao ◽  
Jiyang Fu ◽  
Wenyong Ma ◽  
Yuan Cai ◽  
Yuncheng He
Keyword(s):  
Numerical Simulation ◽  
Wind Speed ◽  
Physical Model ◽  
Energy Harvester ◽  
High Efficiency ◽  
Lateral Displacement ◽  
Maximum Output Power ◽  
Flexible Structure ◽  
Maximum Output ◽  
Cfd Numerical Simulation

According to the engineering phenomenon of the galloping of ice-coated transmission lines at certain wind speeds, this paper proposes a novel type of energy harvester based on the galloping of a flexible structure. It uses the tension generated by the galloping structure to cause periodic strain on the piezoelectric cantilever beam, which is highly efficient for converting wind energy into electricity. On this basis, a physical model of fluid–structure interaction is established, and the Reynolds-averaged Navier–Stokes equation and SST K -ω turbulent model based on ANSYS Fluent are used to carry out a two-dimensional steady computational fluid dynamics (CFD) numerical simulation. First, the CFD technology under different grid densities and time steps is verified. CFD numerical simulation technology is used to simulate the physical model of the energy harvester, and the effect of wind speed on the lateral displacement and aerodynamic force of the flexible structure is analyzed. In addition, this paper also carries out a parameterized study on the influence of the harvester’s behavior, through the wind tunnel test, focusing on the voltage and electric power output efficiency. The harvester has a maximum output power of 119.7 μW/mm3 at the optimal resistance value of 200 KΩ at a wind speed of 10 m/s. The research results provide certain guidance for the design of a high-efficiency harvester with a square aerodynamic shape and a flexible bluff body.

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