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Nonlinear analysis of a two-degree-of-freedom vibration energy harvester using high order spectral analysis techniques

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Show simple item record Nico, Valeria Frizzell, Ronan Punch, Jeff 2021-10-13T09:27:28Z 2021-10-13T09:27:28Z 2017
dc.description peer-reviewed en_US
dc.description.abstract Conventional vibration energy harvesters are generally based on linear mass spring oscillator models. Major limitations with common designs are their narrow bandwidths and the increase of resonant frequency as the device is scaled down. To overcome these problems, a two-degree-of-freedom nonlinear velocity-amplified energy harvester has been developed. The device comprises two masses, oscillating one inside the other, between four sets of nonlinear magnetic springs. Impacts between the masses allow momentum transfer from the heavier mass to the lighter, providing velocity amplification. This paper studies the nonlinear effects introduced by the presence of magnetic springs, using high order spectral analysis techniques on experimental and simulated data obtained for a range of excitation levels and magnetic spring configurations, which enabled the effective spring constant to be varied. Standard power spectrum analysis only provide limited information on the response of nonlinear systems. Instead, bispectral analysis is used here to provide deeper insight of the complex dynamics of the nonlinear velocity-amplified energy harvester. The analysis allows identification of period-doubling and couplings between modes that could be used to choose geometrical parameters to enhance the bandwidth of the device. en_US
dc.language.iso eng en_US
dc.publisher IOP Publishing en_US
dc.relation.ispartofseries Smart Materials and Structures;26 (4)
dc.rights This is the Accepted Manuscript version of an article accepted for publication in Smart Materials and Structures. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at en_US
dc.subject energy harvesting en_US
dc.subject electromagnetic transducer en_US
dc.subject 2Dof en_US
dc.subject magnetic springs en_US
dc.subject high order spectral analysis en_US
dc.title Nonlinear analysis of a two-degree-of-freedom vibration energy harvester using high order spectral analysis techniques en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1088/1361-665X/aa63db
dc.contributor.sponsor SFI
dc.relation.projectid 10/CE/I1853
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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