Abstract
The efficiency of the mechanical energy harvesting with the use of vibrating elements can be improved by synchronizing stimulation vibrations and own linear frequencies of systems as well as super or sub harmonics induced by non-linear phenomena. The article presents numerical cross-sectional study of the mechanical system. The system consists of an elastic beam set vertically, which the lower end is fixed in the rotary support, and is stimulated to move in the horizontal axis. The upper end of the beam is free but below its level there are bumpers limiting the free rotation of the beam. Numerical studies took into account the variability of the frequency and amplitude of the excitation beam movement, and horizontal distance between bumpers. Beam deflection was observed, on the basis of which the amount of energy generated by the piezo element was estimated. Nonlinear phenomena and analysis of frequency synchronization of vibrations improving the energy effect of an energy generator are presented.
Highlights
In the field of energy harvesting, a mechanical systems using non-linearity are used to increase the efficiency of the system with the ambient vibration sources
We focus on energy efficiency with changing selected system parameters, namely: excitation parameters, clearance between the angular amplitude limiters
We studied the energy harvesting system with the inverted elastic pendulum with amplitude limiters
Summary
In the field of energy harvesting, a mechanical systems using non-linearity are used to increase the efficiency of the system with the ambient vibration sources. The frequency and amplitude of the system excitation are directly affecting the power output of the harvesting device. The occurrence of the nonlinear phenomena are giving additional frequency broadness of the moderate power output via inclined nonlinear resonance characteristics, multiple natural frequencies as well as their sub-harmonics and super-harmonics or dynamical hysteresis occurring with frequency change [2,3,4]. We present the results on the bistable vibrational energy harvester with additional amplitude limiters inducing impacts [9, 10]. We focus on energy efficiency with changing selected system parameters, namely: excitation parameters (amplitude and frequency), clearance between the angular amplitude limiters
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