# Research and analysis of an enhanced genetic algorithm identification method based on the LuGre model

## TL;DR

This paper improves a genetic algorithm to better identify friction parameters in high-precision servo systems, enhancing control performance.

## Contribution

A novel genetic algorithm is proposed for precise LuGre model parameter identification in servo systems.

## Key findings

- LuGre-based feedforward compensation outperforms PID control in reducing speed tracking errors.
- Experimental validation shows a 25.1% improvement in tracking accuracy on a linear motor platform.

## Abstract

Nonlinear friction in high-precision, ultra-low-speed servo systems severely degrades performance, causing low-speed crawling, static errors, and limit-cycle oscillations. This study introduces the LuGre friction model to describe these phenomena mathematically and proposes an improved genetic algorithm (GA) for precise parameter identification. Simulations demonstrate that LuGre-based feedforward compensation outperforms conventional proportional-integral-derivative (PID) control, effectively mitigating speed tracking errors and enhancing both speed and position accuracy. Experimental validation on a linear motor platform confirms the method’s efficacy, achieving a 25.1% improvement in tracking accuracy. The results highlight the practical relevance of this approach for precision servo systems. This work has achieved a practical identification framework for LuGre parameters, combining GA optimization with transient/steady-state data, feedforward compensation that directly injects estimated friction forces, bypassing feedback delays and experimental verification of the method’s industrial applicability.