An impact based frequency up-conversion mechanism for low frequency vibration energy harvesting

Edwards, Bryn; Xie, Mengying; Aw, Kean C.; Hu, Aiguo Patrick; Gao, Wei

doi:10.1109/transducers.2013.6627026

Cited by 15 publications

(22 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This article details the design and analysis of a low-frequency electromagnetic energy harvester utilising an impact-based frequency up-conversion mechanism (Edwards et al, 2013). This mechanism utilises a single cantilever and high coefficient of restitution end-stop to produce an oscillation frequency greater than that of the natural frequency of the cantilever from an excitation below the natural frequency.…”

Section: Introductionmentioning

confidence: 99%

Mechanical frequency up-conversion for sub-resonance, low-frequency vibration harvesting

Edwards

2016

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

This article presents analysis and model validation of a single cantilever frequency up-conversion mechanism under stochastic excitation when configured as an electromagnetic energy harvester. The results show that the mechanism is able to achieve an increase in the root mean square velocity of the cantilever end when excited at frequencies below the natural frequency of the beam in the range of 3–7 Hz, as compared to a simple cantilever. The maximum observed gains in root mean square velocity from the experiment varied from 69% at a fundamental excitation frequency of 7 Hz to 153% at 3 Hz for cantilevers with natural frequencies in the range of 8.5–13.3 Hz as compared to a simple cantilever device with the same range of natural frequency. Comparison between the experimental and simulation results demonstrates that the mathematical model of the mechanical system is able to predict the response under such excitation conditions with 99% of the points in the parameter space being fitted at the 95% confidence level. Configured as an electromagnetic harvester based on low-frequency vibration, the device has been shown in the experiment to have a potential gain in average power delivery of 91.5% compared to a simple cantilever structure.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanical frequency up-conversion for sub-resonance, low-frequency vibration harvesting

Edwards

2016

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

show abstract

“…A frequency up converter typically involves a primary resonator or dynamic system that is either linear Rastegar et al (2006); Lee et al (2008); Ferrari et al (2013); Edwards et al (2013) or rotational Priya (2005); Rastegar and Murray (2009) with potential to incorporate transmission gear trains. This primary resonator or dynamic system is typically designed to be responsive to a lower and/or wide band frequency to couple with the ambient source, which is in turn coupled to a secondary resonating system that usually operates at a higher narrow band frequency with a higher quality factor.…”

Section: Frequency Conversionmentioning

confidence: 99%

Review of nonlinear vibration energy harvesting: Duffing, bistability, parametric, stochastic and others

Jia

2020

Journal of Intelligent Material Systems and Structures

122

View full text Add to dashboard Cite

Vibration energy harvesting typically involves a mechanical oscillatory mechanism to accumulate ambient kinetic energy, prior to the conversion to electrical energy through a transducer. The convention is to use a simple linear mass-spring-damper oscillator with its resonant frequency tuned towards that of the vibration source. In the past decade, there has been a rapid expansion in research of vibration energy harvesting into various nonlinear vibration principles such as Duffing nonlinearity, bistability, parametric oscillators, stochastic oscillators and other nonlinear mechanisms. The intended objectives for using nonlinearity include broadening of frequency bandwidth, enhancement of power amplitude and improvement in responsiveness to non-sinusoidal noisy excitations. However, nonlinear vibration energy harvesting also comes with its own challenges and some of the research pursuits have been less than fruitful. Previous reviews in the literature have either focussed on bandwidth enhancement strategies or converged on select few nonlinear mechanisms. This article reviews eight major types of nonlinear vibration energy harvesting reported over the past decade, covering underlying principles, advantages and disadvantages, and application-specific guidance for researchers and designers.

show abstract

“…Frequency up-conversion with impact coupling has also been investigated by several authors. Reference [39] described an frequency up-converting wideband vibration energy harvester with impact coupling. At low frequency base excitation of 18 Hz, it induced 374 Hz free vibrations in PVEH via the impact coupling.…”

Section: Introductionmentioning

confidence: 99%

Vibro-Shock Dynamics Analysis of a Tandem Low Frequency Resonator—High Frequency Piezoelectric Energy Harvester

Žižys

Gaidys

Ostaševičius

et al. 2017

Sensors

View full text Add to dashboard Cite

Frequency up-conversion is a promising technique for energy harvesting in low frequency environments. In this approach, abundantly available environmental motion energy is absorbed by a Low Frequency Resonator (LFR) which transfers it to a high frequency Piezoelectric Vibration Energy Harvester (PVEH) via impact or magnetic coupling. As a result, a decaying alternating output signal is produced, that can later be collected using a battery or be transferred directly to the electric load. The paper reports an impact-coupled frequency up-converting tandem setup with different LFR to PVEH natural frequency ratios and varying contact point location along the length of the harvester. RMS power output of different frequency up-converting tandems with optimal resistive values was found from the transient analysis revealing a strong relation between power output and LFR-PVEH natural frequency ratio as well as impact point location. Simulations revealed that higher power output is obtained from a higher natural frequency ratio between LFR and PVEH, an increase of power output by one order of magnitude for a doubled natural frequency ratio and up to 150% difference in power output from different impact point locations. The theoretical results were experimentally verified.

show abstract

An impact based frequency up-conversion mechanism for low frequency vibration energy harvesting

Cited by 15 publications

References 8 publications

Mechanical frequency up-conversion for sub-resonance, low-frequency vibration harvesting

Mechanical frequency up-conversion for sub-resonance, low-frequency vibration harvesting

Review of nonlinear vibration energy harvesting: Duffing, bistability, parametric, stochastic and others

Vibro-Shock Dynamics Analysis of a Tandem Low Frequency Resonator—High Frequency Piezoelectric Energy Harvester

Contact Info

Product

Resources

About