Exploiting Bursting Oscillations to Improve Energy Capture from Slowly Changing Excitation.

Purpose: Energy harvesting has been extensively developed to scavenge energy from mechanical oscillations. Many investigations focus on the resonant issues which can activate large-amplitude responses in the region of the fundamental frequency. Hence, there are many ultra-low slowly changing excitation sources in the actual environment. To adapt to the slowly changing vibrational excitations, in this paper, we explore a novel bursting oscillations to collect energy induced by the low-frequency excitations. Methods: The slowly changing ambience excitation is proposed by a cosinoidal voltage source, and the nonlinear restoring force is realized using a nonlinear capacitor. A novel harvester of electromechanical device is developed, the electromechanical coupling equations are presented, and the bursting response is observed via numerical integration. Results: The superiority of the presented bursting energy harvester is contrasted with the resonance and nonresonance frequencies. Based on the method of fast–slow dynamical analysis method, the dynamical mechanism of bursting oscillations is revealed via the transformed phase diagram. Furthermore, the effects of system parameters on the bursting motion are discussed. [ABSTRACT FROM AUTHOR]