Friction identification and compensation design for precision positioning

• 来源期刊: 先进制造进展（英文版）
• 关键词: Precision positioning Friction compensation Identification Modeling
• 年，卷（期）: 2017,（2）
• 页码范围: 120-129
• 页数: 10页
• 语种: 英文
• DOI: 10.1007/s40436-017-0171-z

摘要

Precision positioning systems driven by linear motors are vulnerable to force disturbances owing to the reduction of gear transmission.The friction,included in the disturbance,can be modeled and compensated to improve the servo performance.This paper proposes a modified Stribeck friction model (SFM) and an optimization algorithm for consistency with the positioning platform.The compensators based on the friction model and disturbance observer (DOB) are simulated.The simulation results show that as compared with the DOB compensator (the velocity recovers by 5.19％),the friction model based compensator (the velocity recovers by 10.66％) exhibits a better performance after adding the disturbance.Moreover,compensation comparisons among the Coulomb friction,traditional SFM,and modified SFM are performed.The experimental results showthat the following error with modified SFM compensation improves by 67.67％ and 51.63％ at a speed of 0.005 m/s and 0.05 m/s,compared with the Coulomb friction compesation.This demonstrates that the proposed model,optimization algorithm,and compensator can reduce the following error effectively.