A multi-directional multi-stable device: Modeling, experiment verification and applications. (1st January 2021)

• Record Type: Journal Article
• Authors: Yang, Tao; Cao, Qingjie; Li, Qiangqiang; Qiu, Hanqing
• Is Part Of: Mechanical systems and signal processing. Volume 146(2021)
• Publication Date: 2021-01-01
• Subjects: SD oscillator -- Multi-directional multi-stable -- Ultra-low frequency vibration -- Energy harvesting; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2020.106986
• Languages: English
• ISSNs: 0888-3270

Abstract

Highlights: A multi-directional multi-state device based on spring-mass system is originally investigated. Equilibrium analysis demonstrates the multi-stable mechanism and the bifurcation conditions. The Extended Averaging Method is carried out to demonstrate the multi-stable behavior. The designed prototype can be easily adopted for efficient energy harvesting from ultra-low frequency vibration sources. Abstract: Multi-stable vibration energy harvester based on spring-mass system has received widespread attention from many researchers, because the spring-mass multi-stable system has the advantages of low natural frequency, simple structure and high output power. This work considers such a energy harvesting system, but with the additional novelty of using the link mechanism to improve the bistable smooth and discontinuous (SD) oscillator, and a multi-directional multi-stable device (MMD) is proposed. Equilibrium analysis demonstrates the multi-stable mechanism and the bifurcation conditions for the unperturbed system. While for the perturbed system, the Extended Averaging Method is carried out to demonstrate the multi-stable behaviors, transitions between different potential wells, and their large amplitude inter-well motions. The experimental results are compared to theoretical results. Both theoretical and experimental data suggest that the MMD produces a large amplitude response at ultra-low frequencies, enabling motion throughout all equilibrium positions. The designed prototype can be easily adopted for efficient energy harvesting from ultra-low frequency vibration sources.