Modeling and harmonic analysis of energy extracting performance of a piezoelectric nonlinear energy sink system with AC and DC interface circuits. (16th June 2021)

• Record Type: Journal Article
• Authors: Li, Zhaoyu; Xiong, Liuyang; Tang, Lihua; Yang, Weiqing; Liu, Kefu; Mace, Brian
• Is Part Of: Mechanical systems and signal processing. Volume 155(2021)
• Publication Date: 2021-06-16
• Subjects: Nonlinear energy sink -- Vibration energy harvesting -- Equivalent impedance method -- Harmonic balance method; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2021.107609
• Languages: English
• ISSNs: 0888-3270

Abstract

Highlights: An energy harvesting NES system is analyzed with AC and DC interface circuits. DC interface circuit is simplified by adopting equivalent impedance method. Theoretical solutions of proposed systems are derived by harmonic balance method. Holistic equivalent circuit modeling and simulation validate theoretical results. Experiments are conducted to verify results of theoretical analysis and simulation. Abstract: Nonlinear energy sink (NES) has been successfully integrated with vibration energy harvesters to enhance energy extracting performance in a broadband manner. This article intends to evaluate a piezoelectric energy harvester based on the NES technique and coupled to a pure resistive load (EHNES-AC) and a standard rectifying energy extracting circuit (EHNES-DC) under harmonic excitation. A new approach for the analysis of the EHNES-DC system is proposed by simplifying the DC circuit on the basis of the equivalent impedance method (EIM). The theoretical solutions and analyses of the EHNES-AC system, the EHNES-DC system with an original DC circuit based on Shockley diode model and the EHNES-DC system with a simplified DC circuit based on EIM are then derived by the harmonic balance method (HBM). On the other hand, the holistic circuit simulation is performed by employing the equivalent circuit model (ECM) to validate those approximate theoretical analyses. With the assistance of the proposed models and simulation tool, the effect of the load resistance on the efficiencies of the EHNES-AC and EHNES-DC systems is parametrically studied. Experiments are also conducted and verify the main conclusions given by theoretical and numerical studies.