کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
561335 1451884 2012 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Slow-fast response decomposition of a bi-stable energy harvester
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
پیش نمایش صفحه اول مقاله
Slow-fast response decomposition of a bi-stable energy harvester
چکیده انگلیسی

A bi-stable vibration-based energy harvester excited by low frequency base motions exhibits vibrations characterised by a combination of slow and non-stationary fast components. The conversion of slow into fast oscillations by a nonlinear potential barrier can increase the amount of harvested power as has been shown before. In this paper the dynamical behaviour leading to the conversion of low-frequency oscillations into high frequency ones is discussed and explained. A non-parametric response decomposition approach able to separate the slow and fast parts is employed. This decomposition provides deeper insight into the effect of the nonlinear potential barrier by identifying the local evolution of instantaneous amplitude and frequency near the potential barrier and far from it. The slow and fast components are utilised to identify the backbone-curves of the two asymmetric potential wells and the nonlinear stiffness of the system. The proposed decomposition and analysis allow one to examine the repetitive transient dynamics near the potential barrier without resorting to averaging or perturbation based methods. The proposed approach and the subsequent analysis are demonstrated and explained via numerical and experiment results.

Graphical AbstractFigure optionsDownload as PowerPoint slideHighlights
► Highlights the importance of nonlinearity in vibration based energy harvesters.
► Introduces a new non-parametric method for the investigation of bistable oscillators.
► Presents graphically the frequency up-conversion property in nonlinear energy harvesters.
► Compute the double backbone of asymmetric potentials and potential force functions.
► New three-dimensional diagram: instantaneous amplitude and frequency vs. time.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanical Systems and Signal Processing - Volume 31, August 2012, Pages 29–39
نویسندگان
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