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Special Issue "Piezoelectric Energy Harvesting: Analysis, Design and Fabrication, Volume II"

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A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: 10 September 2023 | Viewed by 5633

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Special Issue Editors

Dr. Weiqun Liu

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Guest Editor

School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610032, China
Interests: energy harvesting; nonlinear dynamics; energy management system; sensors
Special Issues, Collections and Topics in MDPI journals

Dr. Yipeng Wu

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Guest Editor

State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Interests: vibration energy harvesting; piezoelectric energy control; energy management system; sensors

Dr. Jiawen Xu

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Guest Editor

Jiangsu Key Lab of Remote Measurement and Control, School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
Interests: piezoelectric energy harvesting; mechanical metamaterial; piezoelectric structural health monitoring; sensors

Special Issue Information

Dear Colleagues,

The development of the IoT (Internet of Things) provides a unique opportunity for the application of WSNs (wireless sensor networks). To realize power independence, sensor nodes are required to harvest energy from an ambient environment. Piezoelectric harvesters, which scavenge energy from ambient vibration, have drawn a remarkable amount of interest in the energy-harvesting field over the past few decades due to their high-power density, low cost, and small scale. Therefore, piezoelectric energy harvesters are regarded as one of the most promising research areas for self-powering solutions.

Improvements in piezoelectric generators involve either enhancement of the mechanical structure to increase power density or the operation bandwidth and electronic interface circuits to enhance harvesting efficiency. This Special Issue aims to highlight innovative strategies and progress in piezoelectric energy harvesting, encompassing research papers, short communications, and review articles. The range of the topics may include but need not be limited to the following aspects: (1) novel designs for piezoelectric harvesters, (2) new adjustable strategies for the structure and circuits of piezoelectric harvesters, (3) creative topology of interface circuits, (4) novel control strategies of interface circuits, (5) realization of self-powered interface circuits, (6) modeling and dynamics of piezoelectric harvesters, and (7) power and task management strategy for energy-harvesting-based sensors.

Dr. Weiqun Liu
Dr. Yipeng Wu
Dr. Jiawen Xu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

piezoelectric energy harvesting
nonlinear generator
synchronous switching circuit
maximum power point tracking
self-adaptation generator
power and task management strategy

Published Papers (7 papers)

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Research

Open AccessArticle

Exploring the Potential of Flow-Induced Vibration Energy Harvesting Using a Corrugated Hyperstructure Bluff Body

and

Micromachines 2023, 14(6), 1125; https://doi.org/10.3390/mi14061125 - 26 May 2023

Viewed by 204

Abstract

Fluid-induced vibration is a common phenomenon in fluid–structure interaction. A flow-induced vibrational energy harvester based on a corrugated hyperstructure bluff body which can improve energy collection efficiency under low wind speeds is proposed in this paper. CFD simulation of the proposed energy harvester was carried out with COMSOL Multiphysics. The flow field around the harvester and the output voltage in different flow velocities is discussed and validated with experiments. Simulation results show that the proposed harvester has an improved harvesting efficiency and higher output voltage. Experimental results show that the output voltage amplitude of the harvester increased by 189% under 2 m/s wind speed. Full article

(This article belongs to the Special Issue Piezoelectric Energy Harvesting: Analysis, Design and Fabrication, Volume II)

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Open AccessArticle

Research on Output Characteristics of Microscale BST Laminate Structure Based on Mixed Finite Element Method

Ying Luo

Tian Pu

and

Hongguang Liu

Micromachines 2023, 14(4), 755; https://doi.org/10.3390/mi14040755 - 29 Mar 2023

Viewed by 332

Abstract

The flexoelectric effect, which is sensitive to size, refers to the phenomenon of coupling between the strain gradient and electrical polarization and involves higher-order derivatives of physical quantities such as displacement, and the analytical process is complicated and difficult. Therefore, in this paper, a mixed finite element method is developed considering the effects of size effect and flexoelectric effect on the electromechanical coupling behavior of microscale flexoelectric materials. Based on the theoretical model of enthalpy density and the modified couple stress theory, the theoretical model and finite element model of microscale flexoelectric effect are established, and the Lagrange multiplier is used to coordinate the higher-order derivative relationship between the displacement field and its gradient, and the C¹ continuous quadrilateral 8-node (displacement and potential) and 4-node (displacement gradient and Lagrange multipliers) flexoelectric mixed element. By comparing the numerical calculation results and analytical solutions of the electrical output characteristics of the microscale BST/PDMS laminated cantilever structure, it is proved that the mixed finite element method designed in this paper is an effective tool for studying the electromechanical coupling behavior of flexoelectric materials. Full article

(This article belongs to the Special Issue Piezoelectric Energy Harvesting: Analysis, Design and Fabrication, Volume II)

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Open AccessArticle

Multi-Objective Topology Optimization of a Broadband Piezoelectric Energy Harvester

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Micromachines 2023, 14(2), 332; https://doi.org/10.3390/mi14020332 - 27 Jan 2023

Viewed by 625

Abstract

In recent years, topology optimization has proved itself to be state of the art in the design of mechanical structures. At the same time, energy harvesting has gained a lot of attention in research and industry. In this work, we present a novel topology optimization of a multi-resonant piezoelectric energy-harvester device. The goal is to develop a broadband design that can generate constant power output over a range of frequencies, thus enabling reliable operation under changing environmental conditions. To achieve this goal, topology optimization is implemented with a combined-objective function, which tackles both the frequency requirement and the power-output characteristic. The optimization suggests a promising design, with satisfactory frequency characteristics. Full article

(This article belongs to the Special Issue Piezoelectric Energy Harvesting: Analysis, Design and Fabrication, Volume II)

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Open AccessArticle

A Pavement Piezoelectric Energy Harvester for Small Input Displacements

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Micromachines 2023, 14(2), 292; https://doi.org/10.3390/mi14020292 - 22 Jan 2023

Cited by 2 | Viewed by 799

Abstract

In order to collect mechanical energy from human motions on pavement without an obvious disturbance, a piezoelectric harvester for small displacement is proposed. A seesaw mechanism is utilized to transmit the pressure displacement to piezoelectric beams. Benefitting from the superiority of used axially deformed beams, the designed scheme can produce a higher voltage than the ones based on the conventional bending cantilever. Favorable electrical energy is achieved by the manufactured prototype under a displacement lower than 1 mm. Two practical applications, including charging a capacitor and powering an environmental sensing node, demonstrate the feasibility of this energy harvester in supplying power for engineering devices. The proposed device shows a favorable capacity to capture energy from humans walking on pavements. Also, this category of axially deformed beam could provide ideas for developing piezoelectric harvesters under small displacements. Full article

(This article belongs to the Special Issue Piezoelectric Energy Harvesting: Analysis, Design and Fabrication, Volume II)

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Open AccessArticle

A Wind-Solar Hybrid Energy Harvesting Approach Based on Wind-Induced Vibration Structure Applied in Smart Agriculture

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Micromachines 2023, 14(1), 58; https://doi.org/10.3390/mi14010058 - 26 Dec 2022

Viewed by 1681

Abstract

Solar energy harvesting devices are widely used in smart agriculture nowadays. However, when lighting conditions are weak, such as through the night or on cloudy days, efficiency decays a lot. Additionally, as time goes by, more and more dust and bird droppings accumulate on the panel, which decreases the performance significantly. This paper aims to overcome the disadvantages mentioned above, and a novel wind–solar hybrid energy harvesting approach is proposed with an oscillation-induced dust-cleaning function. A wind-induced vibration device is specially designed in order to generate electrical energy and/or clean the photovoltaic panel. While in good lighting conditions, the device could keep the panel in a stable state and optimize the photovoltaic power generation efficiency. Such a hybrid energy harvesting approach is called a “suppress vibration and fill vacancy” algorithm. The experimental platform of the proposed device is introduced, and both experimental and simulation results are attained, which prove that using this device, we could realize multiple purposes at the same time. Full article

(This article belongs to the Special Issue Piezoelectric Energy Harvesting: Analysis, Design and Fabrication, Volume II)

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Open AccessArticle

Comparison of Four Electrical Interfacing Circuits in Frequency Up-Conversion Piezoelectric Energy Harvesting

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Micromachines 2022, 13(10), 1596; https://doi.org/10.3390/mi13101596 - 26 Sep 2022

Viewed by 795

Abstract

Efficiently scavenging piezoelectric vibration energy is attracting a lot of interest. One important type is the frequency up-conversion (FUC) energy harvester, in which a low-frequency beam (LFB) impacts a high-frequency beam (HFB). In this paper, four interface circuits, standard energy harvesting (SEH), self-powered synchronous electric charge extraction (SP-SECE), self-powered synchronized switch harvesting on inductor (SP-SSHI) and self-powered optimized SECE (SP-OSECE), are compared while rectifying the generated piezoelectric voltage. The efficiencies of the four circuits are firstly tested at constant displacement and further analyzed. Furthermore, the harvested power under FUC is tested for different electromechanical couplings and different load values. The results show that SP-OSECE performs best in the case of a weak coupling or low-load resistance, for which the maximum power can be 43% higher than that of SEH. As the coupling level increases, SP-SSHI becomes the most efficient circuit with a 31% higher maximum power compared to that of SEH. The reasons for the variations in each circuit with different coupling coefficients are also analyzed. Full article

(This article belongs to the Special Issue Piezoelectric Energy Harvesting: Analysis, Design and Fabrication, Volume II)

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Open AccessArticle

Investigation of Nonlinear Piezoelectric Energy Harvester for Low-Frequency and Wideband Applications

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Micromachines 2022, 13(9), 1399; https://doi.org/10.3390/mi13091399 - 26 Aug 2022

Cited by 4 | Viewed by 815

Abstract

This paper proposes a monostable nonlinear Piezoelectric Energy Harvester (PEH). The harvester is based on an unconventional exsect-tapered fixed-guided spring design, which introduces nonlinearity into the system due to the bending and stretching of the spring. The physical–mathematical model and finite element simulations were performed to analyze the effects of the stretching-induced nonlinearity on the performance of the energy harvester. The proposed exsect-tapered nonlinear PEH shows a bandwidth and power enhancement of 15.38 and 44.4%, respectively, compared to conventional rectangular nonlinear PEHs. It shows a bandwidth and power enhancement of 11.11 and 26.83%, respectively, compared to a simple, linearly tapered and nonlinear PEH. The exsect-tapered nonlinear PEH improves the power output and operational bandwidth for harvesting low-frequency ambient vibrations. Full article

(This article belongs to the Special Issue Piezoelectric Energy Harvesting: Analysis, Design and Fabrication, Volume II)

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