Research

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17 pages, 4033 KiB

Open AccessArticle

A Dual-Beam Coupled System for Hybrid Galloping and Vortex-Induced Vibration Energy Harvesting

by Zhiqing Li, Kaihua Liu, Chaoyang Zhao, Bo Zhou, Yaowen Yang and Guiyong Zhang

Symmetry 2022, 14(12), 2601; https://doi.org/10.3390/sym14122601 - 08 Dec 2022

Viewed by 1167

Small wind energy harvesting converts aeroelastic vibration into electricity and can provide independent power supplies for low-power-consumption sensors, which are not convenient for replacing chemical batteries frequently. As wind energy harvesters collect sustainable energy from the ambient environment, they are environmentally friendly and [...] Read more.

Small wind energy harvesting converts aeroelastic vibration into electricity and can provide independent power supplies for low-power-consumption sensors, which are not convenient for replacing chemical batteries frequently. As wind energy harvesters collect sustainable energy from the ambient environment, they are environmentally friendly and energy saving. The most widely adopted wind-induced vibration mechanisms for designing wind energy harvesters are vortex-induced vibration (VIV) and galloping. VIV-based piezoelectric energy harvesters (VIVPEHs) can stabilize the output voltage at low wind speeds, while galloping-based piezoelectric energy harvesters (GPEHs) can operate at high wind speeds and have wide bandwidths. This paper uses a spring to connect the two traditional wind harvesters to constitute a hybrid wind piezoelectric energy harvester (HWPEH). It is expected that the HWPEH can inherit the advantages of both traditional wind harvesters, i.e., it can reduce the cut-in wind speed, as the traditional VIVPEH, and have a broad working bandwidth, as the traditional GPEH. The effects of the mechanical and circuit parameters on the output voltage and power of the HWPEH are investigated and compared to traditional wind harvesters. It has been found that the aerodynamic behavior of the HWPEH can be customized by changing the masses, stiffnesses, shunt resistances, and damping coefficients. The proposed HWPEH can outperform traditional wind harvesters if the system parameters are well tuned. Full article

(This article belongs to the Special Issue Advances in Energy Harvesting, Metamaterials, and Their Integrated Multifunctional Systems)

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9 pages, 1923 KiB

Open AccessArticle

A Flexible Meta-Curtain for Simultaneous Soundproofing and Ventilation

by Xiaobin Cui, Chenkai Liu, Jinjie Shi, Changhui Shen, Xiaozhou Liu and Yun Lai

Symmetry 2022, 14(11), 2348; https://doi.org/10.3390/sym14112348 - 08 Nov 2022

Cited by 2 | Viewed by 1807

Abstract

We demonstrate a flexible meta-curtain that can simultaneously block the propagation of sound waves of selected frequencies and let air flow through freely. Such a meta-curtain is assembled by two soft and perforated polyvinyl chloride films with an optimized distance between them. The [...] Read more.

We demonstrate a flexible meta-curtain that can simultaneously block the propagation of sound waves of selected frequencies and let air flow through freely. Such a meta-curtain is assembled by two soft and perforated polyvinyl chloride films with an optimized distance between them. The total thickness of the meta-curtain is 1.16 cm and the holes on it have a diameter of 5 cm. The functionality of soundproofing is bestowed by the resonances formed between the films, which is verified by band structure analysis, numerical simulations, and experimental measurements. We experimentally observed sound transmission loss with a peak of 50 dB near 1700 Hz and an average of 26 dB from 1000 Hz to 1760 Hz, which is consistent with the numerical results. Attributing to the softness of the films and the robustness of the resonance, this meta-curtain retains its functionality even at deformations such as bending. Our work paves a way toward soundproof structures with the advantages of ventilation, flexibility, and light weight. Full article

(This article belongs to the Special Issue Advances in Energy Harvesting, Metamaterials, and Their Integrated Multifunctional Systems)

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19 pages, 10082 KiB

Open AccessArticle

Study on Dynamic Snap-Through and Nonlinear Vibrations of an Energy Harvester Based on an Asymmetric Bistable Composite Laminated Shell

by Ting Dong, Xinhua Chen and Jun Zhang

Symmetry 2021, 13(12), 2405; https://doi.org/10.3390/sym13122405 - 13 Dec 2021

Cited by 2 | Viewed by 2018

Abstract

Bistable energy harvesters have been extensively studied. However, theoretical research on the dynamics of bistable energy harvesters based on asymmetric bistable composite laminated plate and shell structures has not been conducted. In this paper, a theoretical model on the dynamics of an energy [...] Read more.

Bistable energy harvesters have been extensively studied. However, theoretical research on the dynamics of bistable energy harvesters based on asymmetric bistable composite laminated plate and shell structures has not been conducted. In this paper, a theoretical model on the dynamics of an energy harvester based on an asymmetric bistable composite laminated shell is established. The dynamic snap-through, the nonlinear vibrations and the voltage output with two potential wells of the bistable energy harvester are studied. The influence of the amplitude and the frequency for the base excitation on the bistable energy harvester is studied. When the frequency for the base excitation with a suitable amplitude in the frequency sweeping is located in a specific range or the amplitude for the base excitation with a suitable frequency in the amplitude sweeping is located in a specific range, the large-amplitude dynamic snap-through, nonlinear vibrations and voltage output with two potential wells can be found to occur. The amplitude and the frequency for the base excitation interact on each other for the specific amplitude or frequency range which migrates due to the softening nonlinearity. The vibration in the process of the dynamic snap-through behaves as the chaotic vibration. The nonlinear vibrations of the bistable system behave as the periodic vibration, the quasi-periodic vibration and the chaotic vibration. This study provides a theoretical reference for the design of energy harvesters based on asymmetric bistable composite laminated plate and shell structures. Full article

(This article belongs to the Special Issue Advances in Energy Harvesting, Metamaterials, and Their Integrated Multifunctional Systems)

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29 pages, 7917 KiB

Open AccessArticle

Global and Local Dynamics of a Bistable Asymmetric Composite Laminated Shell

by Ting Dong, Zhenkun Guo and Guoqing Jiang

Symmetry 2021, 13(9), 1690; https://doi.org/10.3390/sym13091690 - 14 Sep 2021

Cited by 4 | Viewed by 1916

Abstract

As bistable composite laminated plate and shell structures are often exposed to dynamic environments in practical applications, the global and local dynamics of a bistable asymmetric composite laminated shell subjected to the base excitation is presented in this paper. Temperature difference, base excitation [...] Read more.

As bistable composite laminated plate and shell structures are often exposed to dynamic environments in practical applications, the global and local dynamics of a bistable asymmetric composite laminated shell subjected to the base excitation is presented in this paper. Temperature difference, base excitation amplitude, and detuning parameters are discussed. With the change of temperature difference, the super-critical pitchfork bifurcation occurs. Three equilibrium solutions corresponding to three equilibrium configurations (two stable configurations and one unstable configuration) can be obtained. With the increase of excitation amplitude, local and global dynamics play a leading role successively. The global dynamics between the two stable configurations behave as the periodic vibration, the quasi-periodic vibration, the chaotic vibration and dynamic snap-through when the excitation amplitude is large enough. The local dynamics that are confined to a single stable configuration behave as 1:2 internal resonance, saturation and permeation when the excitation amplitude is small. Dynamic snap-through and large-amplitude vibrations with two potential wells for the global dynamics will lead to a broad application prospect of the bistable asymmetric composite laminated shell in energy harvesting devices. Full article

(This article belongs to the Special Issue Advances in Energy Harvesting, Metamaterials, and Their Integrated Multifunctional Systems)

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22 pages, 10036 KiB

Open AccessArticle

Effect of Natural Wind on the Transiting Test for Measuring the Aerodynamic Coefficients of Structures

by Guangxia Zhu, Xin Liu, Lulu Liu and Shengli Li

Symmetry 2021, 13(8), 1493; https://doi.org/10.3390/sym13081493 - 14 Aug 2021

Cited by 2 | Viewed by 2067

Abstract

The aerodynamic coefficients transiting test is a new method for measuring the structural aerodynamic coefficients using the wind generated by a moving vehicle. However, the effect and correction of natural wind on the transiting test has not been studied. Hence, in this study, [...] Read more.

The aerodynamic coefficients transiting test is a new method for measuring the structural aerodynamic coefficients using the wind generated by a moving vehicle. However, the effect and correction of natural wind on the transiting test has not been studied. Hence, in this study, the investigation of the aerodynamic force and pressure measurements on a special triangular prism model is simulated through the transiting test under different natural wind conditions for 30° and 90° angles of wind incidence. Force and pressure measurement results in the transiting test are used to describe and explain the effect of natural wind in the range of 0–3.0 m/s on the aerodynamic coefficients of the symmetric triangular prism qualitatively and quantitatively. The results show that the driving wind field of the vehicle, aerodynamic force coefficient, and aerodynamic pressure coefficient are significantly influenced by strong natural wind greater than 1.71 m/s, which must be considered and so it is recommended that the structure aerodynamic coefficients transiting test should be conducted under the condition that the natural wind is less than 1.71 m/s. In addition, the method of two-direction round-trip measurement is proposed to modify the effect of natural wind on transiting tests. Full article

(This article belongs to the Special Issue Advances in Energy Harvesting, Metamaterials, and Their Integrated Multifunctional Systems)

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24 pages, 5132 KiB

Open AccessArticle

Nonlinear Dynamics of an Unsymmetric Cross-Ply Square Composite Laminated Plate for Vibration Energy Harvesting

by Guoqing Jiang, Ting Dong and Zhenkun Guo

Symmetry 2021, 13(7), 1261; https://doi.org/10.3390/sym13071261 - 14 Jul 2021

Cited by 10 | Viewed by 2220

Abstract

The nonlinear behaviors and energy harvesting of an unsymmetric cross-ply square composite laminated plate with a piezoelectric patch is presented. The unsymmetric cross-ply square composite laminated plate has two stable equilibrium positions by applying thermal stress, thus having snap-through with larger amplitude between [...] Read more.

The nonlinear behaviors and energy harvesting of an unsymmetric cross-ply square composite laminated plate with a piezoelectric patch is presented. The unsymmetric cross-ply square composite laminated plate has two stable equilibrium positions by applying thermal stress, thus having snap-through with larger amplitude between the two stable equilibrium positions relative to the general laminated plate. Based on the von-Karman large deformation theory, the nonlinear electromechanical coupling equations of motion of the unsymmetric composite laminated plate with a piezoelectric patch are derived by using Hamilton’s principle. The influence of the base excitation amplitude on nonlinear behaviors and energy harvesting are investigated. For different base excitation amplitudes, the motions of the system demonstrate periodic motion, quasi-periodic motion, chaotic motion and snap-through, and two single-well chaotic attractors and a two-well chaos attractor coexist. Moreover, the power generation efficiency is optimal when the excitation amplitude is in a certain range due to its own unique nonlinear characteristics. The unsymmetric cross-ply square composite laminated plate subjected to thermal stress can actually be called a kind of bistable composite shell structure that has a broad application prospect in combination with morphing aircraft, large deployable antenna and solar panel, which are very likely to have nonlinear vibration. Full article

(This article belongs to the Special Issue Advances in Energy Harvesting, Metamaterials, and Their Integrated Multifunctional Systems)

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Review

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49 pages, 14068 KiB

Open AccessEditor’s ChoiceReview

Overview: State-of-the-Art in the Energy Harvesting Based on Piezoelectric Devices for Last Decade

by Ivan A. Parinov and Alexander V. Cherpakov

Symmetry 2022, 14(4), 765; https://doi.org/10.3390/sym14040765 - 07 Apr 2022

Cited by 19 | Viewed by 4192

Abstract

Technologies of energy harvesting have been developed intensively since the beginning of the twenty-first century, presenting themselves as alternatives to traditional energy sources (for instance, batteries) for small-dimensional and low-power electronics. Batteries have numerous shortcomings connected, for example, with restricted service life and [...] Read more.

Technologies of energy harvesting have been developed intensively since the beginning of the twenty-first century, presenting themselves as alternatives to traditional energy sources (for instance, batteries) for small-dimensional and low-power electronics. Batteries have numerous shortcomings connected, for example, with restricted service life and the necessity of periodic recharging/replacement that create significant problems for portative and remote devices and for power equipment. Environmental energy covers solar, thermal, and oscillation energy. By this, the vibration energy exists continuously around us due to the operation of numerous artificial structures and mechanisms. Different materials (including piezoelectrics) and conversion mechanisms can transform oscillation energy into electrical energy for use in many devices of energy harvesting. Piezoelectric transducers possessing electric mechanical coupling and demonstrating a high density of power in comparison with electromagnetic and electrostatic sensors are broadly applied for the generation of energy from different oscillation energy sources. For the last decade, novel piezoelectric materials, transformation mechanisms, electrical circuits, and experimental and theoretical approaches with results of computer simulation have been developed for improving different piezoelectric devices of energy harvesting. This overview presents results, obtained in the area of piezoelectric energy harvesting for the last decade, including a wide spectrum of experimental, analytical, and computer simulation investigations. Full article

(This article belongs to the Special Issue Advances in Energy Harvesting, Metamaterials, and Their Integrated Multifunctional Systems)

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16 pages, 29607 KiB

Open AccessReview

Frequency Up-Conversion for Vibration Energy Harvesting: A Review

by Xin Li, Guobiao Hu, Zhenkun Guo, Junlei Wang, Yaowen Yang and Junrui Liang

Symmetry 2022, 14(3), 631; https://doi.org/10.3390/sym14030631 - 21 Mar 2022

Cited by 26 | Viewed by 4236

Abstract

A considerable amount of ambient vibration energy spreads over an ultra-low frequency spectrum. However, conventional resonant-type linear energy harvesters usually operate within high and narrow frequency bands, which cannot match the frequencies of many vibration sources. If the excitation frequency deviates a bit [...] Read more.

A considerable amount of ambient vibration energy spreads over an ultra-low frequency spectrum. However, conventional resonant-type linear energy harvesters usually operate within high and narrow frequency bands, which cannot match the frequencies of many vibration sources. If the excitation frequency deviates a bit from the natural frequency of an energy harvester, the energy harvesting performance will deteriorate drastically. Because of the ultra-low frequency characteristic, it is challenging to reliably harvest energy from the ambient vibrations. To address this mismatching issue, the ultra-low frequency ambient vibrations are converted into high-frequency oscillations using certain mechanical mechanisms, which are termed frequency up-conversion techniques. This paper reviews the existing approaches that can realize frequency up-conversion for enhancing energy harvesting from low-frequency vibration sources. According to their working mechanisms, the existing methods are classified into three categories: impact-based, plucking-based, and snap-through-based approaches. The working principles of the three approaches are explained in detail. Representative designs from all categories are reviewed. This overview on the state-of-the-art frequency up-conversion technology would guide the better design of future kinetic energy harvesting systems. Full article

(This article belongs to the Special Issue Advances in Energy Harvesting, Metamaterials, and Their Integrated Multifunctional Systems)

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