Related references
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Article
Engineering, Mechanical
Peng Li et al.
Summary: This paper investigates the static instability of an inverted cantilevered plate in axial flow with the ground effect. A new theoretical analysis method is proposed and compared with numerical solutions and wind-tunnel experiments. The results show good agreement between the theoretical analysis and the experiments, providing successful prediction of plate instability in the ground effect.
JOURNAL OF FLUIDS AND STRUCTURES
(2023)
Review
Green & Sustainable Science & Technology
Jianyong Zuo et al.
Summary: Railways, as a significant mode of transportation, have been rapidly developed worldwide. However, the energy consumption and carbon emissions of railway transportation have become notable due to global climate change. The increasing speed and demands for safety and reliability in railways have led to the growth of monitoring system requirements. Energy harvesting technology advancements in the past decade offer opportunities for eco-friendly and intelligent railways. Multiple energy sources surrounding the vehicle-track system, such as vibration, wind, solar, thermal, magnetic field, and acoustic energy, can be used for energy harvesting. This comprehensive review presents the progress and representative works of energy harvesting solutions in railway transportation, addressing design, realization, and application prospects of energy harvesters. Additionally, technical challenges related to vibration energy harvesters, including performance enhancements, coupling dynamics, and interface circuits, are discussed, and suggestions are provided for future research directions to bridge research gaps.
Article
Nanoscience & Nanotechnology
Xindan Hui et al.
Summary: The study proposes a self-powered and highly sensitive tribo-label-sensor (TLS) by embedding triboelectric nanogenerator into the roller structure of a label printer. It delivers 6 times higher signal magnitude than traditional infrared sensor and is immune to label jitter and temperature variation. TLS can be used for transparent label directly and shows long-term robustness. This work provides an alternative toolkit to improve label printers and further promote the development of IoT.
NANO-MICRO LETTERS
(2023)
Review
Nanoscience & Nanotechnology
Xiaole Cao et al.
Summary: In the era of 5G and IoTs, human-computer interaction systems based on TENGs and IoTs technologies demonstrate the feasibility of sustainable and self-powered functional systems. IoTs applications relying on TENGs' harvested mechanical energy have greatly transformed human production and daily life. This review introduces TENG applications in various IoTs scenarios and proposes future research directions. The extensive development and applications of TENG will drive the IoTs into an energy autonomy fashion.
NANO-MICRO LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jin-ho Son et al.
Summary: Currently, the focus is on wind energy harvesting, but existing electromagnetic wind generators struggle to capture various types of wind. Wind-driven triboelectric nanogenerators (TENGs) have been studied as an alternative to harness wind energy at different speeds, but their power output is typically low. In this study, a charge-polarization-based flutter-driven TENG (CPF-TENG) with an ambient air ionizing channel (AAIC) is introduced to overcome this limitation. The CPF-TENG with AAIC generates peak voltage and current outputs of 2000 V and 4 A, respectively, enabling it to be stacked in series for complete wind energy harvesting.
ADVANCED MATERIALS
(2023)
Article
Thermodynamics
Usman Latif et al.
Summary: Extensive wind tunnel experiments were conducted to determine the optimal parameters for energy harvesting from piezoelectric membranes. The stiffness and length of the membranes, as well as the shape of the bluff body, were found to significantly impact power generation. By altering the stiffness of the membrane, a substantial increase in power generation was achieved. The results also highlighted the importance of using a bluff body to enhance energy generation, allowing for lower wind speeds and practical applications in remote areas.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Mechanical
Junlei Wang et al.
Summary: The effects of etching concave metasurface patterns on a cylinder bluff body and their influence on vortex-induced vibration (VIV) were investigated. It was found that etching concave metasurface patterns significantly affected the dynamics of the bluff body, enhancing or suppressing VIV. Computational fluid dynamics (CFD) simulations also showed that different concave metasurface patterns significantly affected wake pressure, thus influencing aerodynamics.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Physical
Yangyang Yan et al.
Summary: In order to effectively harness the unstable and complex natural wind in cities, a triboelectric-electromagnetic hybrid generator with swing-blade structures (SBS-TEHG) was designed. By considering the spring structure and base, the maximum output performance of the triboelectric nanogenerators was achieved, and the structure of the SBS-TEHG was optimized using computational fluid dynamics method to improve its aerodynamic performance. The SBS-TEHG achieved an energy conversion efficiency of 9.04% at a starting wind speed of 2 m/s, which was 159% higher than that of the SBS-TEHG without guide plates. The findings of this study provide a novel solution for low-speed wind energy harvesting in cities and demonstrate the potential of SBS-TEHG as a distributed energy source.
Article
Green & Sustainable Science & Technology
Usman Latif et al.
Summary: In this study, the effect of asymmetric wake flow of two side-by-side cylindrical bluff bodies on power output is experimentally examined. Different synchronization modes of the flag with wake flow are observed. The streamwise gap between the flag and cylinders (Gx) and the center-to-center gap between cylinders have a significant impact on the flag's dynamical behavior, resulting in a fluctuation in power output. The levels of output power are analyzed by varying the Gx and the cross-stream or lateral gap (N/d) between the two cylinders.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Review
Chemistry, Physical
Lin-Chuan Zhao et al.
Summary: The Artificial Intelligence of Things (AIoT) connects everything with intelligence, and the increasing energy consumption by electronic devices creates a demand for efficient power supply. Energy harvesting technology has emerged as a promising solution for zero-emission power supply for AIoT. However, there are challenges such as poor electrical output, weak environmental adaptability, and low reliability. Mechanical intelligent energy harvesting, which relies on the system's ability to identify external excitation or its own state, shows great potential in overcoming these challenges. This article discusses the definition, design methodology, and key research directions of mechanical intelligent energy harvesting, highlighting its potential to revolutionize energy harvesting technology and enable new applications.
ADVANCED ENERGY MATERIALS
(2023)
Article
Energy & Fuels
Shanming Bai et al.
Summary: To address the issues of frequent battery replacement and charging, human motion is being explored as a potential energy source for portable electronic devices. However, existing energy harvesters for converting human energy have had low and irregular output, making them unsuitable for sustained power. This paper proposes a high-efficiency electromagnetic-triboelectric hybrid energy harvester (ET-HEH) based on vibration-to-rotation conversion. The experimental results demonstrate that the ET-HEH can achieve an energy conversion efficiency of over 70% under various vibration frequencies. It provides a stable power output of approximately 300 mW during jogging and over 800 mW during sprinting, allowing for continuous charging of a smart band with a rated power of 400 mW. This study presents a new mechanism for vibration-to-rotation conversion and offers a practical approach for harvesting human motion energy with high efficiency.
Article
Thermodynamics
Lipeng He et al.
Summary: In this paper, a hybrid energy harvester (HEH) with a combination of piezoelectric and electromagnetic mechanisms is proposed for energy conversion. Experimental tests show that when the prototype is assembled with optimal structural parameters, the maximum output voltages of a single PEH and EMH are 56.24 V and 1.016 V, and the maximum output power of HEH is 22.78mW, which is significantly higher than that of PEH and EMH. Subsequent underwater and application tests demonstrate that HEH can easily power sensors and small electronic devices, providing a new power supply scheme for monitoring equipment in deep-sea and ocean environments.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Liwei Dong et al.
Summary: This paper proposes a systematic modeling approach for railway vibration energy harvesting systems (VEHSs) considering the intricate interaction and coupling in the vehicle-harvester-circuit system. An equivalent circuit method is used to establish a model for a rotary electromagnetic VEH, and mechanical friction is considered and optimized to improve prediction accuracy. An efficient energy harvesting circuit (EHC) with a speed-driven maximum power point tracking (MPPT) algorithm is designed to extract and store energy from stochastic vehicle suspension vibrations. The developed system model also takes into account the nonlinearities of the freight wagon and the mechanical interaction with the harvester-circuit module. A performance-enhanced control strategy is proposed to maximize onboard harvestable energy. Experimental results show significant improvements in harvester power and force reduction. The prototype of the whole railway VEHS with MPPT closed-loop control is implemented in the embedded environment, enhancing system robustness and practicality in onboard environments.
Article
Chemistry, Physical
Zhihao Hu et al.
Summary: This paper presents a self-powered and high-precision tribo-touch-position sensor (TPS) that can operate without an external probe signal generator and receiver module. By detecting the contact electrification signal and extracting the signal ratio between the edges of a uniform resistance film, TPS achieves precise touch position detection with minimal channels. The mechanism and feasibility of this sensor is systematically analyzed from theory and experiment.
Review
Energy & Fuels
Ahsan Ali et al.
Summary: This paper presents a comprehensive review of energy harvesting systems for wearable technology, focusing on methods based on the human body's heat and mechanical energy. It emphasizes the importance of a sustainable and compatible power supply for continuous operation and high performance of wearable devices. The article provides an overview of different energy harvesters and their fabrication, working, and output results, and discusses the advantages, limitations, and future perspectives of wearable energy harvesting technology.
ENERGY STRATEGY REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Omer Faruk Unsal et al.
Summary: This study presents experimental results on the production, characterization, and applications of three-dimensionally designed piezoelectric-triboelectric hybrid nanogenerators. The nanofiber mats were manufactured using poly(vinylidene fluoride) and thermoplastic polyurethane as the piezoelectric and triboelectric counter materials, respectively. Surface-engineering agents such as poly(vinylpyrrolidone), reduced graphene oxide nanoplates (rGO NPs), and zinc oxide nanowires (ZnO NWs) were utilized for decoration. The resulting hybrid nanogenerators showed significant improvement in voltage and current density.
ACS APPLIED NANO MATERIALS
(2023)
Article
Energy & Fuels
Guobiao Hu et al.
Summary: This work presents a novel Origami-inspired triboelectric nanogenerator (TENG) with stacked architecture for enlarged effective contact area, resulting in improved performance. Experimental results show that the proposed Origami-TENG can produce a power output of around 200 mu W by increasing tapping speed and force, and it can easily power 28 LEDs and an electronic device with sufficient energy.
Article
Chemistry, Physical
Hong-Xiang Zou et al.
Summary: This paper proposes a self-regulation strategy for a triboelectric nanogenerator (TENG-SS) to achieve a self-powered wind-speed sensor. By rationally designing the centrifugal and nonlinear magnetic forces, the separation and contact degrees of the functional materials of TENG can be automatically adjusted for different wind speeds. Experimental results show that the proposed TENG-SS exhibits better performance and robustness in a natural wind environment.
Article
Mathematics, Applied
Qiong Wang et al.
Summary: This paper proposes a galloping energy harvester with the cooperative mode of vibration and collision (GEH-VC) to address the issues of low power and narrow speed range in small-scale wind energy harvesting. It introduces curved boundaries attached with functional materials to improve the performance of the vibration energy harvesting system and convert more mechanical energy into electrical energy during collision.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2022)
Article
Thermodynamics
Liwei Dong et al.
Summary: This paper proposes a novel dual-mass piezoelectric cantilever for efficiently harvesting vibration energy from railway tracks. By adopting a tunable broadband resonant methodology, the energy harvesting capability is significantly enhanced. Experimental results show that the output voltage peaks of the developed piezoelectric cantilever can reach up to 6 times those of conventional harvesters.
Article
Energy & Fuels
Kangqi Fan et al.
Summary: This article introduces a novel automatic-mode-transition strategy that enables a triboelectric nanogenerator (TENG) to work effectively under both low and high wind speeds. With a rationally designed maglev mechanism, the TENG demonstrates low start-up speed, high mechanical durability, and enhanced electrical stability. During durability testing, it outperforms other generators in terms of voltage retention. Additionally, the TENG can be upgraded to a hybrid nanogenerator for higher electric output.
Article
Green & Sustainable Science & Technology
Huicong Liu et al.
Summary: Advancements in the past decade have led to significant progress in hybrid energy harvesting technology, combining energy sources and conversion mechanisms to improve power output. Vibration and thermal energy harvesters play a dominant role in hybrid energy harvesting.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Physical
Yi Zhang et al.
Summary: This study demonstrates how to enhance the output performance of an FTENG by replacing the rigid flagpole with a flexible one, increasing fluttering mechanical energy and contact area. The improved FTENG has the potential to be applied in smart cities as a power source for IoT WSNs.
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Yan Wang et al.
Summary: The study introduces an underwater flag-like Triboelectric Nanogenerator (UF-TENG) based on flow-induced vibration, which shows a simpler structure and better low velocity performance compared to traditional generators. Through parametric studies, it is demonstrated that UF-TENG can effectively harvest energy from ocean currents to power sensors or micro electric appliances in Internet of Things.
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Thermodynamics
Junlei Wang et al.
Summary: This paper investigates the use of metasurface patterns to modify the aerodynamic characteristics of bluff bodies for vortex-induced vibration (VIV) suppression or enhancement. Experimental validation and theoretical modeling are used to analyze the impact of metasurfaces on aerodynamic behaviors and vortex shedding processes. The study provides insights into the mechanisms behind the influence of metasurfaces on VIV systems, suggesting practical recommendations for using piezoelectric transducers with moderate coupling coefficients.
ENERGY CONVERSION AND MANAGEMENT
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Yang Xia et al.
Summary: An optimized flutter-driven triboelectric nanogenerator (TENG) for wind energy harvesting is proposed, achieving a low cut-in wind speed of 3.4 m/s. By adjusting the thickness and length of the membrane and the distance between electrode plates, the peak open-circuit voltage and output power of TENG can reach 297 V and 0.46 mW at a wind speed of 10 m/s. The energy generated by TENG can directly power multiple LEDs and keep a digital watch running continuously at a wind speed of 8 m/s.
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Chemistry, Physical
Cuiying Ye et al.
Summary: The triboelectric-electromagnetic hybrid nanogenerator (FTEHG) effectively harvests various levels of wind energy, broadening the working range of wind speed and showing potential for self-powered weather monitoring applications.
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Junlei Wang et al.
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Fan Yang et al.
Summary: The research introduces a novel approach for the large-scale fabrication of piezoelectric biomaterial thin films with excellent piezoelectric properties and mechanical flexibility. The glycine-PVA films, with their natural compatibility and degradability in physiological environments, have the potential to advance the development of transient implantable electromechanical devices.
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