# Optimized Design of a Sub-Arc-Second Micro-Drive Rotary Mechanism Based on the Swarm Optimization Algorithm

## TL;DR

This paper presents a new micro-drive rotary mechanism optimized for ultra-precision movement using a swarm optimization algorithm.

## Contribution

A novel micro-drive mechanism is designed and optimized for sub-arc-second precision using particle swarm optimization.

## Key findings

- A micro-drive mechanism was designed to convert linear piezoelectric motion into precise rotary motion.
- Structural optimization using particle swarm algorithm improved the maximum output angle and positioning accuracy.
- Experimental verification confirmed the system's high rotary displacement and low positioning error.

## Abstract

The optimization of the micro-motion rotary mechanism aims to obtain the maximum rotation angle in a certain space and increase the compensation range of the micro-motion mechanism. Aiming to address the disadvantages of a small movement stroke, low positioning accuracy, and limited research on the sub-arc-second level of precision micro-drive mechanism, a micro-drive mechanism was designed in this study and structural optimization was performed to obtain the maximum output angle. Additionally, the performance of the optimized mechanism was investigated. First, based on the principle of a flexure hinge guide and conversion, a micro-drive rotary mechanism that could transform the linear motion of piezoelectric ceramics into rotating motion accurately without parasitic motion and non-motion direction force was designed. Second, its structural optimization was achieved using the particle swarm optimization algorithm. Third, analyses of the drive performance and kinematics of the system were conducted. Finally, a performance test platform for the micro-drive rotary mechanism was built, its positioning performance and dynamic characteristics were verified experimentally, and the maximum rotary displacements and positioning error of the system were calculated. This research has certain reference value for studies of ultra-precision positioning.