# The inversion of motion of bristle bots: analytical and experimental analysis

## TL;DR

This paper investigates how the direction of motion in bristle bots can be controlled by adjusting the oscillation frequency, supported by theoretical modeling and experimental validation.

## Contribution

It introduces a method to invert the motion direction of bristle bots through frequency tuning, combining analytical and experimental approaches.

## Key findings

- Motion direction can be reversed by changing oscillation frequency.
- Theoretical model aligns with experimental results.
- Frequency tuning offers a new control mechanism for bristle bots.

## Abstract

Bristle bots are vibration-driven robots actuated by the motion of an internal oscillating mass. Vibrations are translated into directed locomotion due to the alternating friction resistance between robots' bristles and the substrate during oscillations. Bristle bots are, in general, unidirectional locomotion systems. In this paper we demonstrate that motion direction of vertically vibrated bristle systems can be controlled by tuning the frequency of their oscillatory actuation. We report theoretical and experimental results obtained by studying an equivalent system, consisting of an inactive robot placed on a vertically vibrating substrate.