Effects Of Stiffness Non-Linearity On The Electromechanical Coupling Of A Vibration Based Energy Harvesting Device

Ramlan, Roszaidi and Muhammad, Nor Salim and Kok, Swee Leong and Putra, Azma and Jenal, Rustamreen and Zakaria, Nazri Huzaimi and Low, Pei Sing (2017) Effects Of Stiffness Non-Linearity On The Electromechanical Coupling Of A Vibration Based Energy Harvesting Device. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The concept of harvesting energy from ambient to power applications has been gaining attention from researchers in recent times due to its self-sustaining power source solution.Traditionally,the linear system has been used to harvest the energy.However,the limitation due to the difficulty in matching between the natural frequency of the device and the ambient frequency has made it less favourable.Presently,the nonlinear system has been introduced to overcome the limitation of the linear system.Despite of the bandwidth performance,the closed form performance characteristic for the nonlinear system in terms of transduction coefficient and optimum power has yet to be established.In this study,an analytical analysis is conducted using the harmonic balance method to analyse the dynamic characteristics of the systems. The harmonic balance method is further employed to determine the jump frequencies and to deduce the new optimum power expression for the nonlinear system.Also,a proof of concept device with adjustable magnet gap is fabricated.The nonlinearity of the device is varied by adjusting the magnet gap.The dynamic characteristics of the proposed device are investigated experimentally. Further studies involve the effect of nonlinearity on the transduction coefficient and setting the limit of using the linear transduction coefficient on the nonlinear system.The limit is characterized from the analysis of the harmonic ratio.In the experimental analysis,the results reveal that the nonlinear system gradually converges to linear system as the magnet gap increases. In the study involving the transduction coefficient,the limit is characterized based on the harmonic ratio analysis.The results show that the linear transduction coefficient is applicable to the nonlinear system when the harmonic ratio is less than five percent at the multi-stable solutions region.

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