液压伺服缸是液压伺服系统中的关键元件,对系统性能影响很大。而液压伺服缸中的库仑摩擦和内部泄漏对于系统来说是非线性量,它们的存在降低了系统的控制精度和稳定性。普通液压缸中存在着较大的库仑摩擦力,其值通常为最大有效载荷的5～15%。而在我们研制的疲劳试验机中所使用的伺服 Hydraulic servo cylinder hydraulic servo system is a key component, a great impact on system performance. However, Coulomb friction and internal leakage in the hydraulic servo cylinder are non-linear quantities to the system, and their presence reduces the control accuracy and stability of the system. There is a large Coulomb friction in an ordinary hydraulic cylinder, which is usually 5 to 15% of the maximum payload. And in our developed fatigue testing machine used in the servo