Related references
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Article
Engineering, Multidisciplinary
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Summary: In this paper, a mathematical model and experimental results for a vibration generator and magnetic spring prototype that convert mechanical energy to electrical energy are proposed. The magnetic spring model is developed using a robotic approach based on Denavit-Hartenberg's notation, and the vibration generator is modeled using neural networks. The magnetic spring potential energy is calculated using the finite elements method. The laboratory testing results show good agreement with the simulation results for the displacement of the magnetic spring and vibration generator.
Article
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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
Materials Science, Multidisciplinary
Masahiko Ito
Summary: This study proposes a method of fine-tuning the resonance frequency of a magnetostrictive vibration energy harvester by changing the magnetization state using the Delta E effect of Young's modulus. It is found that adjusting the magnetization strength by changing the distance between the magnet and the harvester can tune the resonance frequency in the order of 0.1 Hz. The plot of resonant frequency against the change in flux density shows a good quadratic approximation. A magnetostrictive vibration energy harvester tuned using this method can generate electricity steadily for eleven days, indicating the possibility of long-term use.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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Article
Engineering, Mechanical
Xiaoqing Ma et al.
Summary: This research aims to explore the nonlinear characteristics and energy harvesting performance of asymmetric tristable energy harvesters. By predicting chaotic motion using the Melnikov method and verifying it through numerical simulations, the study reveals the performance and response mechanism of asymmetric tristable energy harvesters.
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Article
Computer Science, Information Systems
Joanna Bijak et al.
Summary: The aim of this paper is to establish mathematical modeling and simulation to calculate the voltage induced during movement of the moveable magnet in a double-sided magnetic spring. changing the geometrical dimensions and shape of permanent magnets allows one to control the stiffness of the double-sided magnetic spring and the natural frequency of the energy harvester system.
Article
Chemistry, Analytical
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Summary: This article focuses on studying the concept and feasibility of an electromagnetic suspension system that is capable of recovering energy. By using a damper composed of permanent magnets and coils, the system can recover the energy generated in automobiles. The paper presents an experimental method to maximize energy recovery.
Article
Chemistry, Analytical
Joanna Bijak et al.
Summary: The aim of this article is to mathematically model and investigate selected parameters of a small energy harvesting system designed to collect energy from mechanical vibrations of car tires and provide power supply for various sensors. The energy harvester consists of three permanent magnets inserted into a tube made of polyamide material. Comsol program is used to calculate the force between the magnets, magnetic spring stiffness, and system's natural frequency. MATLAB program is used to simulate the movement of the movable magnet and compare it with actual measurements. Finally, the mathematical model parameters of the energy harvester are investigated and validated on a specially prepared laboratory test bench.
Article
Engineering, Civil
Gregory C. Conroy et al.
Summary: This research examines the use of viscous dampers and energy harvesting transducers to reduce vibrations in tall buildings and harvest energy from wind-induced vibrations. It compares the differing requirements for supplemental damping under service conditions and extreme events, and develops a nonlinear model for an electromagnetic energy harvesting transducer. The findings of the study will support future exploration of energy harvesting concepts in structural design.
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(2021)
Article
Engineering, Mechanical
A. Romero et al.
Summary: This paper investigates energy harvesting in railway bridges and analyzes performance under different operational conditions. The authors propose an approximation method based on modal superposition to calculate the energy harvested from train-induced bridge vibration, and study the influence of various factors on energy harvesting using simplistic mechanical approaches. They also evaluate the feasibility of energy harvesting based on experimental data from a railway bridge on the Madrid-Sevilla High-Speed line.
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Article
Green & Sustainable Science & Technology
A. Razmjoo et al.
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Review
Chemistry, Physical
Hailing Fu et al.
Summary: This paper comprehensively reviews the state-of-the-art progress in rotational energy harvesting, including energy characteristics, harvester categories, methodologies, mechanisms, and applications. Key developments, critical challenges, and potential research directions and opportunities are summarized and discussed based on progress to date.
Article
Thermodynamics
Shuailing Sun et al.
Summary: A novel dual-magnet TPEH with only one external magnet is proposed in this study, and the system transitions from a tri-stable state to a bi-stable state and then to a mono-stable state as the magnet distance increases, as revealed by the analysis of magnetic force expression and potential function. Simulation results show better output performance in the bi-stable state than in the tri-stable state under low excitation, while the output performance in the tri-stable state is better than in the bi-stable state under large excitation levels.
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