scholarly journals Exploiting Benefits of a Periodically-Forced Nonlinear Oscillator for Energy Harvesting from Ambient Vibrations

2011 ◽  
Vol 25 ◽  
pp. 819-822 ◽  
Author(s):  
C. Trigona ◽  
N. Dumas ◽  
L. Latorre ◽  
B. Andò ◽  
S. Baglio ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Nonlinear Oscillator ◽  
Ambient Vibrations ◽  
Forced Nonlinear Oscillator

U-sequence and period-tripling phenomena in a forced nonlinear oscillator

1985 ◽  
Vol 2 (5) ◽  
pp. 213-216 ◽  
Author(s):  
Wu Shu-xian ◽  
Pei Liu-qing ◽  
Guo Fen
Keyword(s):  
Nonlinear Oscillator ◽  
Forced Nonlinear Oscillator

Energy Harvesting from Ambient Vibrations and Heat

2008 ◽  
Vol 20 (5) ◽  
pp. 609-624 ◽  
Author(s):  
Daniel Guyomar ◽  
Gaël Sebald ◽  
Sébastien Pruvost ◽  
Mickaël Lallart ◽  
Akram Khodayari ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Energy Flow ◽  
Extraction Process ◽  
Energy Scavenging ◽  
Ambient Vibrations ◽  
Point Of Interest ◽  
Piezoelectric Energy ◽  
Detailed Explanation ◽  
Self Powered ◽  
Increasing Demand

Increasing demand in mobile, autonomous devices has made the issue of energy harvesting a particular point of interest. Systems that can be powered up by a few hundreds of microwatts can feature their own energy extraction module, making them truly self-powered. This energy can be harvested from the close environment of the device. Particularly, piezoelectric conversion is one of the most investigated fields for ambient energy harvesting. Moreover, the extraction process can be optimized by proper treatment of the piezomaterial output voltage. This article proposes a detailed explanation of the real energy flow that lies behind several energy conversion techniques for piezoelectric energy scavenging. As well, the principles of energy harvesting using piezoelectric effect is extended to the pyroelectric effect, therefore allowing harvesting energy from temperature variation, which is one of the most common energy sources.

scholarly journals Energy Harvesting From Torsional Vibrations Using a Nonlinear Oscillator

2016 ◽  
Author(s):  
Ben Gunn ◽  
Panagiotis Alevras ◽  
Stephanos Theodossiades
Keyword(s):  
Energy Harvesting ◽  
Low Power ◽  
Wireless Sensors ◽  
Magnetic Levitation ◽  
Electronic Devices ◽  
Excitation Frequency ◽  
Electrical Energy ◽  
Torsional Vibrations ◽  
Ambient Vibrations ◽  
Frequency Spectra

Harvesting ambient energy in a variety of systems and applications is a relatively recent trend, often referred to as Energy Harvesting. This can be typically achieved by harvesting energy (that would otherwise get wasted) through a physical process aiming to convert energy amounts to useful electrical energy. The harvested energy can be thermal, solar, wind, wave or kinetic energy, with the last class mainly referring to harvesting energy from vibrating components or structures. More often these oscillations are error states from the systems’ ideal function and through harvesting this potentially wasted energy could be reclaimed and become useful. Regardless of the generally low power output of the devices designed to harvest energy from vibrations, their use remains an attractive concept, which is mostly attributed to the growing use of modern electronic devices that exploit the low power requirements of semi-conductors. Energy Harvesting applications are often met in situations where a network of essential electronic devices, such as sensors in Structural Health Monitoring or bio-implantable devices, becomes hardly accessible. Harvesting ambient vibrations to power up these devices offers the option to utilize wireless sensors rendering these systems autonomous. Typical cases of systems, where ambient vibrations are ubiquitous are met in automotive and aerospace applications. Besides their potentially adverse impact, the energy carried by vibrating parts could be harvested, such that wireless sensors are powered. In this paper, a concept for harvesting torsional vibrations is proposed, based on a concept that employs magnetic levitation to establish a nonlinear Energy Harvester. Experience has shown that linear harvesters require resonant response to operate, often leading to low performance of the device when the excitation frequency deviates from resonance conditions. This is why harvesters with essential nonlinearity are preferred, since they are able to demonstrate high response levels over wider frequency regions. Herein, the conducted study aims to demonstrate the functionality of this concept for torsional systems. A mathematical model of the coupled nonlinear electromechanical system is established, seeking preliminary estimates of the harvested power. The compelling attribute of this system lies in the dependency of its linear natural frequency on the excitation frequency, which is found to cause multiple response peaks in the corresponding frequency spectra. Moreover, the selection of the static equilibrium of the levitating magnet is found to greatly influence the system’s response.

Tunable Energy Harvesting From Ambient Vibrations

2010 ◽  
Author(s):  
Mohamed Rhimi ◽  
Nizar Lajnef
Keyword(s):  
Energy Harvesting ◽  
Lead Zirconate Titanate ◽  
Coupling Effect ◽  
Energy Levels ◽  
Axial Loading ◽  
Lead Zirconate ◽  
Energy Scavenging ◽  
Ambient Vibrations ◽  
Civil Structures ◽  
Piezoelectric Energy

Most civil structures have a low vibration response frequency range, generally one to two orders of magnitude lower than the operating frequency spectrum of most piezoelectric energy scavenging devices, which is dictated by the device’s design and the used materials. This considerably limits the levels of harvestable power under ambient vibrations. In this paper, the improvement of the energy harvesting characteristics of a bimorph cantilever lead zirconate titanate (PZT) piezoelectric beam through the application of initial pre-stress loading conditions is studied. A generalized model that can take into account all the vibration modes of the beam as well as the back coupling effect is derived using the Hamiltonian principle. The model describes the effect of the pre-stress parameters on the harvestable energy levels. Results showing the variations of the natural frequency, amplitude, and efficiency of the piezoelectric device with varying preload are presented. Vibration recordings from a bridge under ambient loading are used to show variations of the harvested power with different pre-stress conditions. Increases of up to 250% in the output power levels are shown possible through the application of 8N of compressive axial loading for a system with a 15g vibrating mass. Experimental verification of the model is also performed. The time and frequency domain responses of a piezoelectric bimorph are measured and compared to theoretical results.

A Piezoelectric Based Energy Harvester With Dynamic Magnification

2015 ◽  
Author(s):  
Davide Castagnetti
Keyword(s):  
Energy Harvesting ◽  
Fractal Geometry ◽  
Efficient Solution ◽  
Experimental Validation ◽  
Computational Analysis ◽  
Energy Harvester ◽  
Piezoelectric Materials ◽  
Piezoelectric Transducers ◽  
Ambient Vibrations ◽  
Piezoelectric Energy

Energy harvesting from ambient vibrations exploiting piezoelectric materials is an efficient solution for the development of self-sustainable electronic nodes. This work presents a simple and innovative piezoelectric energy harvester, intrinsically including dynamic magnification and inspired by fractal geometry. After an initial design step, computational analysis and experimental validation show a very good frequency response with five eigenfrequencies below 100 Hz. Even if the piezoelectric transducers were put only on a symmetric half of the top surface of the structure, the energy conversion is good for all the eigenfrequencies investigated.

Forced nonlinear oscillator with nonsymmetric dry friction

2006 ◽  
Vol 77 (5) ◽  
pp. 353-362 ◽  
Author(s):  
K. Zimmermann ◽  
I. Zeidis ◽  
M. Pivovarov ◽  
K. Abaza
Keyword(s):  
Dry Friction ◽  
Nonlinear Oscillator ◽  
Forced Nonlinear Oscillator
Sign in / Sign up

Export Citation Format

Share Document