Work

Pre-Compensation Strategy for Tracking Error and Contour Error by Using Friction and Cross-Coupled Control

Year: 2024

Type: article

Abstract: This paper focuses on improving the tracking accuracy for servo systems and increasing the contouring performance of precision machining. The dynamic friction during precision machining is analyzed using the LuGre model. The dynamic and static parameters in the friction model are efficiently and accurately identified using the improved Drosophila swarm algorithm based on cross-mutation. The friction tracking error can be deduced from the friction state space and an expression is derived. To compensate for the tracking error caused by friction, a feedforward compensation control is designed to avoid signal lag in traditional friction controllers. Furthermore, the factors of multi-axis parameter mismatching that impact the machining profile accuracy are analyzed for multi-axis control. An adaptive cross-coupled control-based pre-compensation strategy of contour error is designed to reduce both the tracking error and the contour error. The effectiveness of the proposed method is validated through several experiments, which demonstrate a remarkable improvement in tracking performance and contour accuracy.

Source: Machines

DOI: 10.3390/machines12090593

Authors: Minghao Liu, Yongmin Zhu, Hongliang Xu, Weirui Liu, Hui Yang, Xingjun Gao

Institutions: Liaoning Shihua University, Guangdong Polytechnic Normal University, Beihang University

Language: English

Topic: Dynamics and Control of Mechanical Systems

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,728

Funder: National Science Foundation