Introduces the working principle and the method of the selection about the type ZY47 Valve controlled by the pressure difference, and analyses its adaption condition.
介绍了ZY 47型自力式压差控制阀的工作原理和选型方法，分析了不同被控环路系统的适用条件。
The reason of difference is analyzed and a new method named Combined Feature Selection is put forward.
分析了产生差异的原因，并提出一种适合于中文环境的特征选取方法：组合特征选取方法。
Performance experiments about ZY47 pressure -difference control valve and ZL47 flux control valve have been done, based on their structure and work principle, presented the method of type selection.
对ZY 47型自力式压差控制阀和ZL47型流量控制阀进行了性能实验，并依据它们的结构特点和工作原理，提出了选型方法。
Through the suitable selection of difference quotient and correction of the one-dimension inaccuracy linear searching, scope of the improved method is extended.
从应用角度出发，首先，将约束变尺度法改进为一般约束条件，通过适当选择差商形式和对一维不精确线性搜索方法的修正，扩大了该方法的适用范围。
This paper presents an adaptive fault circuit selection method based on the principle that the difference of transient energy of normal circuits and that of fault circuit is.
提出一种基于暂态能量的故障选线自适应方法，利用所有健全线路暂态能量与故障线路暂态能量之差为最小值的原理，构成故障选线算法。
This paper presents an adaptive fault circuit selection method based on the principle that the difference of transient energy of normal circuits and that of fault circuit is.
提出一种基于暂态能量的故障选线自适应方法，利用所有健全线路暂态能量与故障线路暂态能量之差为最小值的原理，构成故障选线算法。
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