# Energy harvesting below the onset of flutter

## TL;DR

This paper explores a novel energy harvesting method from a stable flutter system using external forcing, enabling controlled vibration and energy extraction even below the flutter onset, independent of the flutter point.

## Contribution

It introduces a new approach to energy harvesting in stable flutter systems through external forcing, allowing on-demand energy extraction.

## Key findings

- Negative excitation work observed in certain parameters
- Energy harvesting possible below flutter onset
- External forcing controls vibrations independently of flutter point

## Abstract

This work demonstrates preliminary results on energy harvesting from a linearly stable flutter-type system with circulatory friction forces. Harmonic external forcing is applied to study the energy flow in the steady sliding configuration. In certain parameter ranges negative excitation work is observed where the external forcing allows to pull part of the friction energy out of the system and thus makes energy harvesting possible. Studies reveal that this behavior is largely independent of the flutter point and thus that it is primarily controlled by the excitation. Contrary to existing energy harvesting approaches for such systems, this approach uses external forcing in the linearly stable regime of the oscillator which allows to control vibrations and harvest energy on demand.