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Applied mathematical modelling v.55, 2018년, pp.205 - 223   SCIE
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Dynamics regularization with tree-like structures

Nieuwenhuis, Rochelle (Department of Mathematical and Statistical Sciences, University of Alberta Edmonton, AB T6G 2G1, Canada ) ; Kubota, Madoka (Fuji Electric, Power Electronics Technology Development Center, Product Technology Laboratory, 1, Fuji-machi, Hino-city, Tokyo 191-8502, Japan ) ; Flynn, M.R. (Corresponding author. ) ; Kimura, Masayuki (Department of Electrical Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan ) ; Hikihara, Takashi (Department of Electrical Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan ) ; Putkaradze, Vakhtang (Department of Mathematical and Statistical Sciences, University of Alberta Edmonton, AB T6G 2G1, Canada ) ;
  • 초록  

    Abstract The dynamics of a fully nonlinear, tree-structured resonator and its response to a broadband forcing of the branches is examined. It is shown that the broadband forcing yields a transfer of energy between the parts of the spectrum so that the spectrum becomes progressively more narrow-band for each level of the tree-like structure in the direction of the stem. We show that this behavior is in contrast to the response of a linear oscillator, which simply filters out the harmonics away from the resonance. We term such behavior “regularization” and examine its significance for two- and three-dimensional motion using a Lagrangian framework. Key to our analysis is to investigate the dependence of the spectrum of motion, and its narrowing, on the parameters of the tree-like structure, for instance the lengths of different branches. Model predictions are obtained for idealized wind forcing characterized by an airflow that is interrupted at random time intervals. Our numerically-derived results are then compared against the data collected from select analogue laboratory experiments, which confirm the robust nature of the vibration regularization. Highlights A novel tree-like energy harvester is proposed. The dynamics regularizes towards the stem when broadband forcing is applied. Qualitatively similar behavior is observed in two- and three-dimensional motion. The possibility of energy harvesting by planar structures is also examined.


  • 주제어

    Nonlinear dynamics .   Coupled nonlinear oscillators .   Tree-like structures .   Dynamics regularization.  

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