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论文类型：期刊论文

发表时间：2014-03-04

发表刊物：INSTRUMENTATION SCIENCE & TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：42

期号：2

页面范围：184-199

ISSN号：1073-9149

关键字：electro-hydraulic; force control; friction compensation; friction model

摘要：Nonlinear friction is the main factor in the electro-hydraulic servo force control system. It causes steady-state and tracking errors that are difficult to eliminate during static and dynamic loading. In recent years, many studies have been done to reduce or eliminate the influence of the friction in the control system. This article discusses an electro-hydraulic servo force control system to complete simulation experiments in the laboratory. According to friction theory, the effect of friction near the zero-velocity point that appeared twice within a cycle during the test would be very obvious, which distorts the waveform and decreases the control accuracy. Due to the special purpose of the electro-hydraulic servo force control system, a practical friction compensation method has been introduced in this article. The friction static friction model, dynamic friction model, and identification methods are discussed in detail. The experimental results show that this practical friction compensation method can significantly reduce the influence of the nonlinear friction and improve control accuracy in the high-precision electro-hydraulic servo force control system.