Non-linear Energy Harvesting from Coupled Impacting Beams

K Vijayan, MI Friswell, H Haddad Khodaparast & S Adhikari (Swansea University)

International Journal of Mechanical Sciences, Vol. 96-97, June 2015, pp. 101-109


Energy harvesting has many potential applications for structures with broadband excitation, such as aircraft noise and low frequency vibrations from human motion. The advantage with a vibro-impacting system is the capability of converting low frequency response to high frequencies. A coupled beam system is base excited and the influence of different system parameters are studied. Model reduction was carried out to reduce the computational cost. Exciting the system at a single resonant frequency indicates the influence of clearance and base excitation amplitude on the beam responses. The frequency sweep study shows the sensitivity of the power generated to the contact stiffness, damping and clearance between the beams. The power generated by the coupled system from the non-linear impact is sensitive to the thickness ratio and the clearance. The variation in thickness ratio alters the spacing of the natural frequencies of the system which causes modes to interact. This study shows that higher power is produced than the linear system, depending on the dissimilarity in the mode shapes of the interacting close modes.

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This material has been published in the International Journal of Mechanical Sciences, Vol. 96-97, June 2015, pp. 101-109, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by Elsevier. Note this paper is published as Open Access.

Link to paper using doi: 10.1016/j.ijmecsci.2015.03.001

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