some main problems in modelling the electro hydraulic servo loading system are discussed, and an example is given to illustrate the modelling procedure and display the results for a practical system.
抽油机电液伺服加载系统是一种位置扰动型的施力系统 ,存在着非线性、不确定因素及由于位置扰动引起的多余力 ,传统的控制方法不能达到理想的效果 。