Eur. Phys. J. Spec. Top. (2022) 231: 1567-1586
https://doi.org/10.1140/epjs/s11734-022-00495-9

Regular Article

Effective design of vibro-impact energy harvesting absorbers with asymmetric stoppers

Department of Mechanical and Aerospace Engineering, New Mexico State University, 88003, Las Cruces, NM, USA

^b abdu@nmsu.edu

Received: 13 September 2021
Accepted: 20 February 2022
Published online: 3 March 2022

Abstract

An investigation is carried out for the purpose of simultaneously controlling a base-excited dynamical system and enhancing the effectiveness of a piezoelectric energy harvesting absorber. Amplitude absorbers are included to improve the energy harvested by the absorber with the possibility of activating broadband resonant regions to increase the operable range of the absorber. This study optimizes the stoppers’ ability for the energy harvesting absorber to generate energy by investigating asymmetric gap and stiffness configurations. Medium stiffnesses of $5\times {10}^4\text{N/m}$ and $1\times {10}^5\text{N/m}$ show significant impact on the primary system’s dynamics and improvement in the level of the harvested power for the absorber. A solo stopper configuration when the gap distance is $0.02\text{m}$ improves 29% in peak power and 9% in average power over the symmetrical case. Additionally, an asymmetric stiffness configuration when one of the stiffnesses is $1\times {10}^5\text{N/m}$ and a gap size of $0.02\text{m}$ indicates an improvement of 25% and 8% for peak and average harvested power, respectively, and the second stopper’s stiffness is $5\times {10}^3\text{N/m}$. Hard stopper configurations shows improvements with both asymmetric cases, but not enough improvements to outperform the system without amplitude stoppers.