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dc.contributor.authorKunz, Jancs
dc.contributor.authorFialka, Jiřícs
dc.contributor.authorPikula, Stanislavcs
dc.contributor.authorBeneš, Petrcs
dc.contributor.authorKrejčí, Jakubcs
dc.contributor.authorKlusáček, Stanislavcs
dc.contributor.authorHavránek, Zdeněkcs
dc.date.accessioned2021-04-01T10:54:31Z
dc.date.available2021-04-01T10:54:31Z
dc.date.issued2021-03-30cs
dc.identifier.citationSENSORS. 2021, vol. 21, issue 7, p. 1-19.en
dc.identifier.issn1424-8220cs
dc.identifier.other170992cs
dc.identifier.urihttp://hdl.handle.net/11012/196489
dc.description.abstractMeasuring the efficiency of piezo energy harvesters (PEHs) according to the definition constitutes a challenging task. The power consumption is often established in a simplified manner, by ignoring the mechanical losses and focusing exclusively on the mechanical power of the PEH. Generally, the input power is calculated from the PEH’s parameters. To improve the procedure, we have designed a method exploiting a measurement system that can directly establish the definition-based efficiency for different vibration amplitudes, frequencies, and resistance loads. Importantly, the parameters of the PEH need not be known. The input power is determined from the vibration source; therefore, the method is suitable for comparing different types of PEHs. The novel system exhibits a combined absolute uncertainty of less than 0.5% and allows quantifying the losses. The approach was tested with two commercially available PEHs, namely, a lead zirconate titanate (PZT) MIDE PPA-1011 and a polyvinylidene fluoride (PVDF) TE LDTM-028K. To facilitate comparison with the proposed efficiency, we calculated and measured the quantity also by using one of the standard options (simplified efficiency). The standard concept yields higher values, especially in PVDFs. The difference arises from the device’s low stiffness, which produces high displacement that is proportional to the losses. Simultaneously, the insufficient stiffness markedly reduces the PEH’s mechanical power. This effect cannot be detected via the standard techniques. We identified the main sources of loss in the damping of the movement by the surrounding air and thermal losses. The latter source is caused by internal and interlayer friction.en
dc.formattextcs
dc.format.extent1-19cs
dc.format.mimetypeapplication/pdfcs
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofSENSORScs
dc.relation.urihttps://www.mdpi.com/1424-8220/21/7/2388cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectpiezoelectricen
dc.subjectpiezoelectric ceramicen
dc.subjectlead zirconate titanate (PZT)en
dc.subjectpolyvinylidene fluoride (PVDF)en
dc.subjectenergy harvestingen
dc.subjectefficiencyen
dc.subjectefficiency measurementen
dc.subjectpower conversionen
dc.subjectpower flowen
dc.titleA New Method to Perform Direct Efficiency Measurement and Power Flow Analysis in Vibration Energy Harvestersen
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Kybernetika pro materiálové vědycs
thesis.grantorVysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. Ústav automatizace a měřicí technikycs
sync.item.dbidVAV-170992en
sync.item.dbtypeVAVen
sync.item.insts2021.04.01 12:54:30en
sync.item.modts2021.04.01 12:14:21en
dc.coverage.issue7cs
dc.coverage.volume21cs
dc.identifier.doi10.3390/s21072388cs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1424-8220/cs
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen


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Creative Commons Attribution 4.0 International
Except where otherwise noted, this item's license is described as Creative Commons Attribution 4.0 International