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中文摘要：
电路网络法建模可以通过看电路图直接写出其传递函数形式的数学模型，键图法可以很容易地将液压系统的键图绘制出来。本文以键图为中介，将电路网络法推广应用到液压系统中去，即将液压系统绘制成键图，然后将该键图转换成等效的电路图，再根据电路网络法直接写出其传递函数形式的数学模型。实例推导证明本方法比较简单、快速、直观。
英文摘要：
The mathematical model in format of transfer function could be written directly through observing its circuit diagram using circuit network modeling method. The bond graph of a hydraulic system could be easily drawn using bond graph modeling method. The circuit network modeling method was extended from circuit system into hydraulic system by medium of bond graph. The bond graph of a hydraulic system was drawn, and then transformed into its equivalent circuit diagram, the mathematical model in format of transfer function was directly written according to the circuit network modeling method. Calculation of an actual example shows that the method is simple, rapid and visual.
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