Run-Time Concurrency Tuning for Peak Power Modulation in Energy Harvesting Systems

2011 ◽  
Author(s):  
Yu Zhou ◽  
Terrence Mak ◽  
Alex Yakovlev
Keyword(s):  
Energy Harvesting ◽  
Peak Power ◽  
Power Modulation ◽  
Harvesting Systems ◽  
Run Time

Influence of Power Conditioning on the Optimization of Energy Harvesting Systems

2009 ◽  
Author(s):  
Stephen G. Burrow ◽  
Lindsay R. Clare
Keyword(s):  
Energy Harvesting ◽  
Peak Power ◽  
Electrical Power ◽  
Building Blocks ◽  
Load Resistance ◽  
Maximum Power ◽  
Power Conditioning ◽  
Harvesting Systems ◽  
Converter Topology ◽  
Power Point

Energy harvesting systems have components in both mechanical and electrical domains and in order to optimize the design of the overall system, the effect of practical electrical power conditioning sub-systems on the mechanical operation of the harvester must be taken into account. From basic considerations of a linear energy harvester it is shown that, for optimum mass displacement, the effective load resistance presented to the harvester by the power conditioning circuitry should be equal to or less than the load resistance at the peak power point. Further consideration reveals that peak power per volume may occur at an operating point different to that at which maximum power is achieved. The commonly available building blocks of the power conditioning system have characteristics that make it impossible to operate the harvester in a stable manner in the optimum region, and more complex techniques of maximum power tracking may consume excessive quiescent power and are only valid if maximum power is required at all times. The discussion is illustrated by numerical simulations. Finally a converter topology is described and realized, using discrete components, that goes some way to addressing these issues.

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.

Multimodal pizza-shaped piezoelectric vibration-based energy harvesters

2021 ◽  
pp. 1045389X2110069
Author(s):  
Virgilio J Caetano ◽  
Marcelo A Savi
Keyword(s):  
Energy Harvesting ◽  
Frequency Spectrum ◽  
Optimization Procedure ◽  
Single Mode ◽  
Ambient Vibration ◽  
Vibration Source ◽  
Element Analysis ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
Harvesting Systems

Energy harvesting from ambient vibration through piezoelectric devices has received a lot of attention in recent years from both academia and industry. One of the main challenges is to develop devices capable of adapting to diverse sources of environmental excitation, being able to efficiently operate over a broadband frequency spectrum. This work proposes a novel multimodal design of a piezoelectric energy harvesting system to harness energy from a wideband ambient vibration source. Circular-shaped and pizza-shaped designs are employed as candidates for the device, comparing their performance with classical beam-shaped devices. Finite element analysis is employed to model system dynamics using ANSYS Workbench. An optimization procedure is applied to the system aiming to seek a configuration that can extract energy from a broader frequency spectrum and maximize its output power. A comparative analysis with conventional energy harvesting systems is performed. Numerical simulations are carried out to investigate the harvester performances under harmonic and random excitations. Results show that the proposed multimodal harvester has potential to harness energy from broadband ambient vibration sources presenting performance advantages in comparison to conventional single-mode energy harvesters.

A closed-loop wide-range tunable mechanical resonator for energy harvesting systems

2009 ◽  
Vol 19 (9) ◽  
pp. 094004 ◽  
Author(s):  
Christian Peters ◽  
Dominic Maurath ◽  
Wolfram Schock ◽  
Florian Mezger ◽  
Yiannos Manoli
Keyword(s):  
Energy Harvesting ◽  
Closed Loop ◽  
Mechanical Resonator ◽  
Wide Range ◽  
Harvesting Systems
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