Hybrid rotary-translational vibration energy harvester using cycloidal motion as a mechanical amplifier

Moss, Scott D.; Hart, Genevieve A.; Burke, S. K.; Carman, Gregory P.

doi:10.1063/1.4861601

Cited by 39 publications

(35 citation statements)

References 29 publications

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“…The missing component in Figure 6 is the power module, the size of which will vary depending on the configuration. A variety of powering options will be catered for, including a wired USB link, battery power and ultimately a capacity to link to strain and vibration based energy harvesters [7].…”

Section: System Integrationmentioning

confidence: 99%

Autonomous stress imaging cores: from concept to reality

et al. 2016

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The historical reliance of thermoelastic stress analysis on cooled infrared detection has created significant cost and practical impediments to the widespread use of this powerful full-field stress measurement technique. The emergence of low-cost microbolometers as a practical alternative has allowed for an expansion of the traditional role of thermoelastic stress analysis, and raises the possibility that it may in future become a viable structural health monitoring modality. Experimental results are shown to confirm that high resolution stress imagery can be obtained from an uncooled thermal camera core significantly smaller than any infrared imaging device previously applied to TSA. The paper provides a summary of progress toward the development of an autonomous stress-imaging capability based on this core.

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Section: System Integrationmentioning

confidence: 99%

Autonomous stress imaging cores: from concept to reality

et al. 2016

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“…Repeating the frequency sweeps for this case and considering the coupled response of Eqs. (12) and (13), frequency response curves of the coupled oscillator are obtained.…”

Section: Time Histories Of the Harvester's Responsementioning

confidence: 99%

“…This is consistent with the time histories, where the highest average power was recorded for a relation between the frequencies abiding to the previous inequality. Also, one should not overlook the bandwidth of the response curve for the power, which approximately conveys that for a 4 Hz band (11)(12)(13)(14)(15), the average power will be over 25 mW.…”

Section: Time Histories Of the Harvester's Responsementioning

confidence: 99%

“…Mann and Sims [10], Foisal et al [11] and Berdy et al [12] used magnetic levitation, whereas Moss et al [13] used a magnetic tether to create a nonlinear translational energy harvester with a wide operating bandwidth. The main advantage is that the performance of a nonlinear harvester presents relative robustness to variations of the excitation frequency.…”

Section: Introductionmentioning

confidence: 99%

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Energy Harvesting From Torsional Vibrations Using a Nonlinear Oscillator

Gunn

Alevras

Theodossiades

2016

Volume 8: 28th Conference on Mechanical Vibration and Noise

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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.

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“…Several devices using impact mechanisms [12][13][14][15][16] have shown usefulness for widening system bandwidth and for low-frequency vibrations such as human motion. However, beyond a critical acceleration sufficient to drive the proof mass displacement to its maximum amplitude, the output power saturates [12,17] and is left increasingly far below the theoretical power bound for displacement-limited operation [18].…”

Section: Introductionmentioning

confidence: 99%

Power optimization and effective stiffness for a vibration energy harvester with displacement constraints

Truong¹,

Le²,

Halvorsen³

2016

J. Micromech. Microeng.

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This paper presents experiments on how to approach the physical limits on power from vibration energy harvesting under displacement-constrained operation. A MEMS electrostatic vibration energy harvester with voltage-control of the system stiffness is used for this purpose. The power saturation problem, when the proof-mass displacement reaches a maximum amplitude for sufficient acceleration amplitude, is shifted to higher accelerations by use of load optimization. In addition we demonstrate the effect of varying the electromechanical coupling k 2. Measurement results show that harvested power can be made to follow the optimal power of the velocity-damped generator also for a range of accelerations that implies displacement constraints. Comparing to the saturated power, the power increases 1.5 times with the optimal load for electromechanical coupling k 2 =8.7%. The improvement is 2.3 times for a higher coupling of k 2 =17.9%. The obtained system effectiveness exceeds 60%. This work shows a first demonstration of reaching optimal power in the intermediate acceleration-range between the two extremes of maximum efficiency and maximum power transfer. The experimental results follow the theoretical results for a device with both load and stiffness tuning surprisingly well despite only optimizing the load here. We compared a linearized lumped-model of the device with the same augmented by end-stop nonlinearities. The comparison shows that an effective stiffness due to end-stop impacts in the latter model closely matches the optimal stiffness for the former model and therefore can explain why the experimental output power is close to optimal despite lack of deliberate stiffness tuning.

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Hybrid rotary-translational vibration energy harvester using cycloidal motion as a mechanical amplifier

Abstract: A non-resonant, frequency up-converted electromagnetic energy harvester from human-body-induced vibration for hand-held smart system applications

Cited by 39 publications

References 29 publications

Autonomous stress imaging cores: from concept to reality

Autonomous stress imaging cores: from concept to reality

Energy Harvesting From Torsional Vibrations Using a Nonlinear Oscillator

Power optimization and effective stiffness for a vibration energy harvester with displacement constraints

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