Toward broadband vibration energy harvesting via mechanical motion-rectification induced inertia nonlinearity

Liu, Fengwei; Tai, Wei-Che

doi:10.1088/1361-665x/aac238

Cited by 35 publications

(20 citation statements)

References 33 publications

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“…The benefits of the B-SSHI configuration in both reducing power fluctuation and increasing the output power are illustrated by comparing different configurations. The advantages are clearly illustrated over a wide frequency range (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). The enhancement can be up to 525% compared to a harvester without bi-stability Figure 13.…”

Section: Resultsmentioning

confidence: 98%

“…The B-SSHI configuration exhibits reduced power fluctuation at high excitation frequencies and improved output power compared to the NB-STD configuration. In addition, for the NB-STD configuration, the output power is more sensitive to load resistance variation, whereas the B-SSHI configuration has a relatively constant optimal load resistance (2 MΩ) over a wide operational frequency range (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16), as illustrated by the red dots on the contour plots in Fig. 7.…”

Section: Theoretical Analysis and Discussionmentioning

confidence: 99%

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Exploring coupled electromechanical nonlinearities for broadband energy harvesting from low-frequency rotational sources

Zhou

Yeatman

2019

Smart Mater. Struct.

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This paper presents a methodology to effectively harness low-frequency broadband rotational energy using coupled electromechanical non-linearities. This design integrates bi-stability and a synchronized switch harvesting on inductor (SSHI) circuit into a frequency up-converting harvester. The bistable behaviour enables improved output power due to the increased vibration amplitude under the same input plucking force. The SSHI circuit exhibits enhanced conversion capability, contributing higher electrical damping which is ideal for frequency up-converting harvesters to alleviate output power fluctuation at high frequencies. To study the coupled nonlinear dynamics from both the mechanical (bi-stability) and electrical (SSHI) sides, a system-level theoretical model is, for the first time, established and numerically solved using Matlab/Simulink. System behaviours, which would not be able to obtain using circuit simulation methods, are studied for different operating frequencies and load resistances. To validate the theoretical analysis, this harvester was implemented and tested experimentally. A close match was obtained. From the experimental results, an enhanced output power (up to 525%), over a broad frequency range, was realized, compared to that of a harvester with neither bi-stability nor SSHI circuits.

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Section: Resultsmentioning

confidence: 98%

Section: Theoretical Analysis and Discussionmentioning

confidence: 99%

Exploring coupled electromechanical nonlinearities for broadband energy harvesting from low-frequency rotational sources

Zhou

Yeatman

2019

Smart Mater. Struct.

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“…k, m, c m and c e are the spring stiffness, mass, mechanical damping, and electrical damping of the spring-mass-damping system respectively. From [16], the electrical damping is calculated as…”

Section: Linear Systemsmentioning

confidence: 99%

Adaptive damping tuning and circuit implementation for broad bandwidth energy harvesting

Sharma

Liu

Jung

et al. 2020

Smart Mater. Struct.

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This paper presents a circuit to tune the electrical damping for optimal power harvesting at time varying excitation frequencies. Optimization of parameters, such as electrical damping to match the mechanical damping and the resonant frequency to match the excitation frequency have long been known. However, the electrical damping optimized at the resonant frequency is not necessarily the optimum point when the excitation frequency changes. This result is especially important in vibration energy harvesting systems since the vibration source is generally not at a single fixed frequency. The proposed circuit detects the excitation frequency and tunes the electrical damping based on a function, obtained from mechanical system modeling and simulation. A frequency detection circuit and a boost converter operating in critical conduction mode are used. Both modeling and experiment results show that the impedance tuning circuit provides the required optimal damping at different excitation frequencies and achieves a much broader bandwidth compared with the conventional system. When the excitation frequency increases to 1.1–1.4 times the natural frequency, the proposed adaptive damping tuning increases the power output by 30%–100% compared to the traditional one.

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“…With the rapid development of the Internet of Things, people need electronic devices in more and more places in production and life, but electronic devices are often affected by the performance of battery life, so there is an urgent need for a device that can use external energy to convert into electricity for electronic devices to work. Wind energy from the natural environment [1,2], solar energy [3,4], vibration energy [5,6], geothermal energy [7,8], etc., can generate energy, of which vibration energy is the most widely distributed; other energy collection methods are limited by the application conditions and difficult to be widely used, so the capture of vibration for microelectronic products and systems is more universal significance [9].…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of the Segmentation Method on the Power Generation Performance of Rectangular Piezoelectric Energy Harvester

et al. 2022

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Since the piezoelectric energy harvester will generate strain zero point when it is bent, it will affect the power generation effect. In this paper, the strain zero point of the cantilever beam of the rectangular piezoelectric energy harvester is studied through theoretical analysis. The main analysis is the specific location of the strain zero point in the first-, second-, and third-order modes of the cantilever beam of the energy capturer. The results of the theoretical analysis are verified by experimenting with different segmentation methods of piezoelectric energy harvesters. The experimental results show that the piezoelectric energy harvester is segmented at 0.275 in the length direction of the piezoelectric ceramic in the second-order mode, and the output power is 5 times that of the nonsegmented state. In the third-order mode, the piezoelectric energy harvester is segmented at 0.16 and 0.61 in the length direction of the piezoelectric ceramic, and the output power is 5.83 times that of the nonsegmented state. The research in this paper provides new ideas and methods for improving the power generation capacity of piezoelectric energy harvesters.

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Toward broadband vibration energy harvesting via mechanical motion-rectification induced inertia nonlinearity

Cited by 35 publications

References 33 publications

Exploring coupled electromechanical nonlinearities for broadband energy harvesting from low-frequency rotational sources

Exploring coupled electromechanical nonlinearities for broadband energy harvesting from low-frequency rotational sources

Adaptive damping tuning and circuit implementation for broad bandwidth energy harvesting

Study of the Effect of the Segmentation Method on the Power Generation Performance of Rectangular Piezoelectric Energy Harvester

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