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分析被动式加载系统的工作特点以及多余力的产生机理，研究液压动力元件的结构参数与多余力的关系，进一步分析多余力的本质特征，探讨克服被动式加载系统多余力、提高加载精度的有效方法，为研制高性能的被动式加载系统提供理论依据．
This paper analyzes the working characteristics of passive loading system and the generation mechanism of excess force, studies the relationship between structure parameters of hydraulic power components and excess force, further analyzes the essential features of excess force, discusses effective methods to overcome the excess load of passive loading system and improve the loading accuracy, It provides theoretical basis for developing high performance passive loading system.