Surfing the High Energy Output Branch of Nonlinear Energy Harvesters

2016 ◽  
Vol 117 (19) ◽  
Author(s):  
D. Mallick ◽  
A. Amann ◽  
S. Roy
Keyword(s):  
High Energy ◽  
Energy Output ◽  
Energy Harvesters ◽  
Nonlinear Energy

Impact-induced high-energy orbits of nonlinear energy harvesters

2015 ◽  
Vol 106 (9) ◽  
pp. 093901 ◽  
Author(s):  
Shengxi Zhou ◽  
Junyi Cao ◽  
Daniel J. Inman ◽  
Shengsheng Liu ◽  
Wei Wang ◽  
...  
Keyword(s):  
High Energy ◽  
Energy Harvesters ◽  
Nonlinear Energy

Bistable Energy Harvesting From Human Motion

2015 ◽  
Author(s):  
Wei Wang ◽  
Junyi Cao ◽  
Shengxi Zhou ◽  
Jing Lin
Keyword(s):  
Energy Harvesting ◽  
Human Motion ◽  
Ambient Vibration ◽  
Energy Output ◽  
Potential Well ◽  
Energy Devices ◽  
Energy Harvesters ◽  
Cantilever Structure ◽  
Well Function ◽  
Nonlinear Energy

Recently, the power supply for portable electronic devices using the electricity extracted from human motion and ambient vibrations has received considerable attention from multidiscipline field. Among many energy converting mechanisms, the ease miniaturization of piezoelectric cantilever structure propels many research groups to investigate the potential of efficient energy harvesting from ambient vibration using resonant phenomena. However, the incapability of traditional linear energy harvesting from low frequency or varying frequency vibrations has become an open issue. This paper investigates the feasibility of nonlinear energy harvesters with different bistable potential well functions in harvesting energy from walking and running vibration. The portable nonlinear energy harvesting device and its measurement system has been established to obtain the model parameter and excitation signal from human motion. The electromechanical model for bistable energy harvesters with different nonlinear restoring force is derived from theoretical method and experimental data. Numerical investigation under human walking and running vibrations shows that large amplitude interwell motion are easily achieved to improve energy output while the proper potential well function of bistable oscillators is designed. The comparative experiments for nonlinear energy devices with different potential well function are performed. The history and frequency spectrum of output voltage demonstrate the effectiveness of numerical simulation and the clear potential of bistable energy harvesting from human motion by means of appropriate potential function design.

Impulsively-Excited Bistable Energy Harvester Combined With Electromagnetic Mechanism

2018 ◽  
Author(s):  
Shitong Fang ◽  
Wei-Hsin Liao
Keyword(s):  
Energy Harvester ◽  
Damping Ratio ◽  
High Amplitude ◽  
High Energy ◽  
Living Environment ◽  
Energy Output ◽  
Energy Harvesters ◽  
Hybrid Configuration ◽  
Promising Source ◽  
Bistable Energy Harvester

Impulsive energy provides a promising source for energy harvesting techniques due to their high amplitude and abundance in a living environment. The sensitivity to excitation of bistable energy harvesters makes them feasible for impulsive-type events. In this paper, a novel impulsively-excited bistable energy harvester with rotary structure and plectrum is proposed to achieve plucking-based frequency up-conversion. The input excitation is converted to plucking force on the bistable energy harvester, so as to help it go into the high-energy orbit. The piezoelectric and electromagnetic transduction mechanisms are combined by incorporating a coil to the structure in order to overcome the increase of damping introduced by the bistable configuration. As a result, high-energy output and broadband performance could be realized. Impact mechanics is employed to develop a comprehensive model, which could be used to analyze the nonlinear dynamics and predict the system responses under various plucking velocities and overlap lengths. Numerical simulation shows that the bistable energy harvester could experience large-amplitude oscillation under impulsive excitation and the hybrid configuration outperforms the standalone ones under high damping ratio and low coupling coefficient. The proposed design is targeted to be applied on the turnstile gates of the subway station. Less human effort would be needed when passengers pass the turnstile gate due to the snap-through motion of bistability.

scholarly journals Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits

AIP Advances ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 085315
Author(s):  
P. V. Malaji ◽  
M. I. Friswell ◽  
S. Adhikari ◽  
G. Litak
Keyword(s):  
High Energy ◽  
Energy Harvesters ◽  
Nonlinear Energy

Orbit Jumps of Monostable Energy Harvesters by a Bidirectional Energy Conversion Circuit

2019 ◽  
Author(s):  
Jiahua Wang ◽  
Bao Zhao ◽  
Junrui Liang ◽  
Wei-Hsin Liao
Keyword(s):  
Energy Harvesting ◽  
Energy Conversion ◽  
Vibration Amplitude ◽  
Energy Harvester ◽  
High Energy ◽  
Wide Frequency Range ◽  
Energy Harvesters ◽  
Novel Approach ◽  
Switch Control ◽  
Nonlinear Energy

Abstract Nonlinear energy harvesters have been widely studied in the last decade. Their broad bandwidth and relatively high power output contribute to energy harvesting applications. However, the coexisting multiple orbits brought by the nonlinearity weaken the performance of nonlinear energy harvesters. This paper proposes to achieve orbit jumps of monostable energy harvesters by a bidirectional energy conversion circuit. Changing the switch control sequence in the bidirectional energy conversion circuit facilitates it with both the energy harvesting and vibration exciting functions. Thus, a nonlinear energy harvester in connection with the circuit can harness ambient energy as well as excite itself, through energy harvesting and vibration exciting modes separately. Based on the concept of vibration exciting, the energy saved in the storage is used to stimulate the piezoelectric transducer for a larger vibration amplitude, which enables orbit jumps. The working mechanism of the circuit is introduced. Experimental setup of a monostable energy harvester has been developed to validate the proposed method. The monostable system can be stimulated to high-energy orbit from a small vibration amplitude by the vibration exciting mode of the circuit. It is also revealed that the method can achieve orbit jumps in a wide frequency range within the hysteresis area. Evaluations on energy consumption and energy gain show that the sacrificed energy can be quickly recovered. A novel approach for orbit jumps of monostable energy harvesters is performed so as to open new opportunities for monostable energy harvesters.

scholarly journals Celery-derived porous carbon materials for superior performance supercapacitor

2021 ◽  
Author(s):  
Sirui Liu ◽  
Ya ping Xu ◽  
Jinggao Wu ◽  
Jing Huang
Keyword(s):  
Porous Carbon ◽  
Carbon Materials ◽  
High Energy ◽  
Cycle Life ◽  
Superior Performance ◽  
Energy Output ◽  
Next Generation ◽  
Porous Carbon Materials ◽  
Long Cycle Life ◽  
Sustainable Materials

Supercapacitors are of paramount importance for next-generation applications, demonstrating high energy output, an ultra-long cycle life and utilizing green and sustainable materials. Herein, we utilize celery, a common biomass from...

Reliability-Based Design Optimization for Nonlinear Energy Harvesters

2015 ◽  
Author(s):  
Sumin Seong ◽  
Christopher Mullen ◽  
Soobum Lee
Keyword(s):  
Energy Harvesting ◽  
Design Optimization ◽  
Reliability Based Design Optimization ◽  
Vibration Energy Harvester ◽  
Reliability Design ◽  
Energy Harvesters ◽  
Reliability Based Design ◽  
Stable Characteristic ◽  
Tip Mass ◽  
Nonlinear Energy

This paper presents reliability-based design optimization (RBDO) and experimental validation of the purely mechanical nonlinear vibration energy harvester we recently proposed. A bi-stable characteristic was embodied with a pre-stressed curved cantilever substrate on which piezoelectric patches were laminated. The curved cantilever can be simply manufactured by clamping multiple beams with different lengths or by connecting two ends of the cantilever using a coil spring. When vibrating, the inertia of the tip mass activates the curved cantilever to cause snap-through buckling and makes the nature of vibration switch between two equilibrium positions. The reliability-based design optimization study for maximization of power density and broadband energy harvesting performance is performed. The benefit of the proposed design in terms of excellent reliability, design compactness, and ease of implementation is discussed. The prototype is fabricated based on the optimal design result and energy harvesting performance between the linear and nonlinear energy harvesters is compared. The excellent broadband characteristic of the purely mechanical harvester will be validated.

Theoretical Analysis and General Characteristics for Nonlinear Vibration Energy Harvesters

2021 ◽  
Author(s):  
Hanxiao Wu ◽  
Zhi Tao ◽  
Haiwang Li ◽  
Tiantong Xu ◽  
Wenbin Wang ◽  
...  
Keyword(s):  
Output Power ◽  
Numerical Study ◽  
Power Line ◽  
Energy Harvesters ◽  
Output Performance ◽  
Equivalent Time ◽  
Time Average ◽  
Mechanical Damping ◽  
Limit Power ◽  
Nonlinear Energy

Abstract In this paper, we present a systematic theoretical and numerical study of the output performance of nonlinear energy harvesters. The general analytical expression of output power for systems with different combinations of nonlinear stiffness and nonlinear damping, as well as symmetrical and asymmetrical systems, have been derived based on harmonic balance method, observing compliance with numerical results. We theoretically prove that there is a limit power for all nonlinear systems which is determined exclusively by the vibrator mass, excitation acceleration, and mechanical damping. The results also indicate that for symmetrical stiffness systems, the asymmetrical damping components have no effect on the output performance. Additionally, we derived semi-analytical solutions of the matching loads and numerically investigated the influence of nonlinear coefficients on the output power with matched load. When the load matches device parameters and is much larger than the internal resistance, the equivalent time-average damping is equal to the mechanical damping. Although the matching load and output power vary with the nonlinear coefficients, the normalized power and matching resistance ratio follow a power function, named matching power line, which is independent of the structural parameters. With the improvement of the equivalent time-average short-circuit damping in the vibration range, the normalized power moves to the right end of the matching power line, and the output power approach to the limit power. These conclusions provide general characteristics of nonlinear energy harvesters, which can be used to guide the design and optimization of energy harvesters.

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