Experimental Vibration Analysis of the Zigzag Structure for Energy Harvesting

2011 ◽  
pp. 281-290
Author(s):  
M. A. Karami ◽  
D. J. Inman
Keyword(s):  
Energy Harvesting ◽  
Vibration Analysis ◽  
Zigzag Structure

Energy Harvesting From Bike Using Linear DC Motor

2010 ◽  
Author(s):  
Reza Sabzehgar ◽  
Siamak Arzanpour
Keyword(s):  
Energy Harvesting ◽  
Vibration Analysis ◽  
Center Of Mass ◽  
Dc Motor ◽  
Linear Motor ◽  
Electrical Parameters ◽  
Power Simulation ◽  
Linear Dc Motor ◽  
Simulation Results

This paper investigates the application of a proposed energy harvesting mechanism to convert the vibrations in a bicycle tire to electricity. For this setting all tire spokes have been removed and two spring-damper links and one linear DC motor are used instead. The vibration analysis of the tire’s center of mass caused by bicycle motion is obtained using trigonometric relations. Moreover, the regenerated power by the linear motor is obtained analytically. This model together with the motion of the center of the mass of the tire are used to estimate the harvested power. The mechanical and electrical parameters are also optimized to harvest the maximize the power. Simulation results show the efficiency of proposed energy harvesting mechanism.

scholarly journals Scanning confocal vibrometer microscope for vibration analysis of energy-harvesting MEMS in wearables

2017 ◽  
Vol 84 (s1) ◽  
Author(s):  
Robert Kowarsch ◽  
Jürgen Janzen ◽  
Christian Rembe ◽  
Hyunjun Cho ◽  
Hyuck Choo
Keyword(s):  
Energy Harvesting ◽  
Dynamic Analysis ◽  
Vibration Analysis ◽  
Microelectromechanical Systems ◽  
Laser Doppler Vibrometer ◽  
Mode Shapes ◽  
Confocal Laser ◽  
Contactless Measurement ◽  
Medical Implants ◽  
Resonance Frequencies

AbstractWe present a scanning confocal laser-Doppler vibrometer microscope for sensitive, contactless measurement of microelectromechanical systems (MEMS). This systems enables the dynamic analysis up to 3.2 MHz with a lateral resolution of few micrometers. We show measurements on developed MEMS for vocal-energy harvesting in wearables and medical implants. For efficient harvesting a cantilever beam with a serpentine form was designed with a fundamental resonance at 200 Hz. We verified the simulated mode shapes with our vibration measurements. The observed deviations in resonance frequencies between simulation and measurement are due to modelling and manufacturing dissimilarities.

Design and modeling of a flexible longitudinal zigzag structure for enhanced vibration energy harvesting

2016 ◽  
Vol 28 (3) ◽  
pp. 367-380 ◽  
Author(s):  
Shengxi Zhou ◽  
Weijia Chen ◽  
Mohammad H Malakooti ◽  
Junyi Cao ◽  
Daniel J Inman
Keyword(s):  
Theoretical Model ◽  
Energy Harvesting ◽  
Free Vibration Analysis ◽  
Free Vibrations ◽  
Vibration Energy ◽  
Vibration Energy Harvesting ◽  
Element Analysis ◽  
Low Frequencies ◽  
Wide Range ◽  
Zigzag Structure

The use of piezoelectric materials for vibration energy harvesting at low frequencies is challenging and requires innovative structural design. Here, a flexible longitudinal zigzag structure is developed to enhance energy harvesting at low-frequency ambient vibrations. The proposed structure is composed of orthogonal beams which enable vibration energy harvesting in two directions. A theoretical model based on Euler–Bernoulli beam theory is formulated to study the dynamic response of the structure under free vibrations. The free vibration analysis demonstrates that low operating frequencies can be obtained by increasing the number of, and/or the length of, beams in the proposed structure. To validate the accuracy of the developed theoretical model, finite element analysis is performed using ANSYS. On verification of the model’s accuracy, the piezoelectric effect of the active beams is considered in the model to evaluate the energy harvesting performance of the proposed flexible longitudinal zigzag structure. Numerical results demonstrate that the output voltage and the working frequency of these energy harvesting structures can be tailored through simply altering the number of beams. Overall, the results indicate that the proposed structure is capable of efficient energy conversion at low frequencies, which makes them suitable for a wide range of working conditions.

scholarly journals Free and Forced Vibration Analysis of H-type and Hybrid Vertical-Axis Wind Turbines

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6747
Author(s):  
Minhui Tong ◽  
Weidong Zhu ◽  
Xiang Zhao ◽  
Meilin Yu ◽  
Kan Liu ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Wind Energy ◽  
Natural Frequency ◽  
Forced Vibration ◽  
Vibration Analysis ◽  
Cfd Simulation ◽  
Vertical Axis ◽  
Aerodynamic Loads ◽  
Vertical Axis Wind Turbines ◽  
Forced Vibration Analysis

Vertical-axis wind turbines (VAWTs) are compact and efficient and have become increasingly popular for wind energy harvesting. This paper mainly focuses on free and forced vibration analysis of two different types of VAWTs, i.e., an H-type VAWT and a new hybrid VAWT. The H-type VAWT has a lower cost, while the hybrid VAWT has a better self-starting capability at a low wind velocity. Both of them can be used for wind energy harvesting. By using the assumed modes method, the two VAWTs are simplified by a single degree-of-freedom (SDOF) model. By utilizing the method of structural mechanics, a multi-degree-of-freedom (MDOF) model is developed for the two VAWTs and the turbines in them are reasonably simplified. Natural frequency analyses for the SDOF and MDOF models of the two VAWTs are conducted. A beam element model (BEM) of the two VAWTs is created to calculate their natural frequencies and mode shapes and to verify natural frequency results from the SDOF and MDOF models. By using the BEM of the two VAWTs, their amplitude-frequency responses are obtained from harmonic response analysis. To analyze forced vibrations of the two VAWTs, aerodynamic loads on the two VAWTs are obtained from computational fluid dynamics (CFD) simulation. By using solid element models of the two VAWTs, forced transient responses of the two VAWTs are calculated by using the aerodynamic loads from CFD simulation. Steady-state forced response amplitudes of the 1 m-mast hybrid VAWT are 23.8% and 20.5% smaller in X- and Y-directions than those of the 1 m-mast H-type VAWT, respectively. Frequency contents of the aerodynamic loads from CFD simulation are calculated, which confirm that they are periodic, and the power efficiency of the H-type VAWT is about 2.6% higher that of the hybrid VAWT.

Analysis of magneto rheological elastomers for energy harvesting systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 439-446
Author(s):  
Gildas Diguet ◽  
Gael Sebald ◽  
Masami Nakano ◽  
Mickaël Lallart ◽  
Jean-Yves Cavaillé
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Shear Strain ◽  
Magnetic Induction ◽  
Magnetic Particles ◽  
Homogeneous Magnetic Field ◽  
Electrical Signal ◽  
Harvesting Systems ◽  
Dc Bias ◽  
Magneto Rheological

Magneto Rheological Elastomers (MREs) are composite materials based on an elastomer filled by magnetic particles. Anisotropic MRE can be easily manufactured by curing the material under homogeneous magnetic field which creates column of particles. The magnetic and elastic properties are actually coupled making these MREs suitable for energy conversion. From these remarkable properties, an energy harvesting device is considered through the application of a DC bias magnetic induction on two MREs as a metal piece is applying an AC shear strain on them. Such strain therefore changes the permeabilities of the elastomers, hence generating an AC magnetic induction which can be converted into AC electrical signal with the help of a coil. The device is simulated with a Finite Element Method software to examine the effect of the MRE parameters, the DC bias magnetic induction and applied shear strain (amplitude and frequency) on the resulting electrical signal.

Simply supported FPEDs connected by springs for broadband energy harvesting

2020 ◽  
Vol 64 (1-4) ◽  
pp. 201-210
Author(s):  
Yoshikazu Tanaka ◽  
Satoru Odake ◽  
Jun Miyake ◽  
Hidemi Mutsuda ◽  
Atanas A. Popov ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Evaluation Method ◽  
Energy Harvester ◽  
Vibrational Energy ◽  
Functional Materials ◽  
Vibration Energy ◽  
Theoretical Evaluation ◽  
Vibration Energy Harvester ◽  
Polyvinylidene Difluoride ◽  
Simply Supported

Energy harvesting methods that use functional materials have attracted interest because they can take advantage of an abundant but underutilized energy source. Most vibration energy harvester designs operate most effectively around their resonant frequency. However, in practice, the frequency band for ambient vibrational energy is typically broad. The development of technologies for broadband energy harvesting is therefore desirable. The authors previously proposed an energy harvester, called a flexible piezoelectric device (FPED), that consists of a piezoelectric film (polyvinylidene difluoride) and a soft material, such as silicon rubber or polyethylene terephthalate. The authors also proposed a system based on FPEDs for broadband energy harvesting. The system consisted of cantilevered FPEDs, with each FPED connected via a spring. Simply supported FPEDs also have potential for broadband energy harvesting, and here, a theoretical evaluation method is proposed for such a system. Experiments are conducted to validate the derived model.

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