As a typical servo system for simulating various loads in the experiment, the electro-hydraulic loading system is quite a complex machine-electricity-hydraulic multiple system.

由于是一个典型的力伺服系统，而且在仿真实验过程中需要模拟各种载荷的变化情况，电液伺服加载系统是一个相当复杂的机—电—液复合系统。

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It is the typical passive electro-hydraulic force control system. It mainly includes two parts-loading system and driving system.

它是一个典型的被动式电液力控制系统，主要由加载系统和驱动系统两部分组成。

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Aiming at the problems as the nonlinear factors and the position disturbance in the electro-hydraulic servo loading system of pumping unit, the conventional control method cant attain perfect effect.

抽油机电液伺服加载系统存在非线性和位置扰动引起的准确度问题，传统的控制方法不能达到理想的效果。

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