Design and optimisation of an underfloor energy harvesting system

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dc.contributor.author Evans, Matthew en
dc.contributor.author Tang, Lihua en
dc.contributor.author Tao, K en
dc.contributor.author Aw, Kean en
dc.date.accessioned 2019-06-10T01:37:36Z en
dc.date.issued 2019-01 en
dc.identifier.citation Sensors and Actuators A: Physical 285:613-622 Jan 2019 en
dc.identifier.issn 0924-4247 en
dc.identifier.uri http://hdl.handle.net/2292/46888 en
dc.description.abstract Piezoelectric stack energy harvesters have the advantage of generating electrical power for small amounts of deflection. In an underfloor energy harvesting application, this is advantageous as the device does not disrupt the gait of pedestrians overhead. Low frequency, stochastic loading patterns are typical of underfloor applications, where the precise gait, weight and number of pedestrians are unpredictable. Energy harvesters targeting this type of directly applied load are faced with the challenge of providing sufficient force for power generation and determining appropriate matching of the piezoelectric stack to the circuit being powered, to achieve the highest possible energy conversion efficiency. The latter is particularly challenging in the case of stochastic input, due to the piezoelectric stack’s dependence on frequency. To address these challenges, a force amplification frame is used in conjunction with a piezoelectric stack to provide an increase of up to 10 times of the applied load to the stack. A method of modelling the energy harvester is presented to optimise the device to suit a range of typical inputs, including walking, jogging and multiple pedestrian loading conditions. The methods used are capable of incorporating measured data from existing support platforms and the behaviour of interfacing power management circuitry into the optimisation loop, providing an accurate means of predicting the response of the energy harvesting system under typical operating conditions. The model is experimentally validated, and the results used to demonstrate a potential power increase of a factor of 21 when compared to an off-the-shelf piezoelectric stack. en
dc.publisher Elsevier en
dc.relation.ispartofseries Sensors and Actuators A: Physical en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.rights.uri https://www.elsevier.com/about/policies/sharing en
dc.title Design and optimisation of an underfloor energy harvesting system en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.sna.2018.12.002 en
pubs.begin-page 613 en
pubs.volume 285 en
dc.rights.holder Copyright: Elsevier en
pubs.author-url https://www.sciencedirect.com/science/article/pii/S0924424718315619 en
pubs.end-page 622 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 757794 en
pubs.org-id Engineering en
pubs.org-id Mechanical Engineering en
pubs.record-created-at-source-date 2018-12-12 en
pubs.online-publication-date 2018-12-06 en


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