Insights on the Effects of Magnetic Forces on the Efficiency of Vibration Energy Harvesting Absorbers in Controlling Dynamical Systems

Journal Article · Tue Jan 24 23:00:00 EST 2023 · Energies

DOI:https://doi.org/10.3390/en16031272· OSTI ID:1916504

Alvis, Tyler; Mesh, Mikhail; Abdelkefi, Abdessattar

This study investigates the effects of magnetic constraints on a piezoelectric energy harvesting absorber while simultaneously controlling a primary structure and harnessing energy. An accurate forcing representation of the magnetic force is investigated and developed. A reduced-order model is derived using the Euler–Lagrange principle, and the impact of the magnetic force is evaluated on the absorber’s static position and coupled natural frequency of the energy harvesting absorber and the coupled primary absorber system. The results show that attractive magnet configurations cannot improve the system substantially before pull-in occurs. A rigorous eigenvalue problem analysis is performed on the absorber’s substrate thickness and tip mass to effectively design an energy harvesting absorber for multiple initial gap sizes for the repulsive configurations. Then, the effects of the forcing amplitude on the primary structure absorber are studied and characterized by determining an effective design of the system for a simultaneous reduction in the primary structure’s motion and improvement in the harvester’s efficiency.

• Sponsoring Organization: USDOE
• OSTI ID: 1916504
• Alternate ID(s): OSTI ID: 2311699
• Journal Information: Energies, Journal Name: Energies Journal Issue: 3 Vol. 16; ISSN 1996-1073; ISSN ENERGA
• Publisher: MDPI AG
• Country of Publication: Switzerland
• Language: English