发布时间：2023-09-06 10:56:16 人气：611
PCL401-04-UT04-002派克进口液压阀通常以空载流量q0=Kqxv为输出参量。因此双喷嘴挡板力反馈两级电液伺服阀的传递函数还可以表示为式中，Ksv为伺服阀的流量增益，其取值为。
在大多数电液伺服系统中，PCL401-04-UT04-002派克进口液压阀的动态响应往往高于动力元件的动态响应。为了简化系统的动态特性分析与设计，其传递函数可以进一步简化，一般可用二阶振荡环节表示。如果电液伺服阀二阶环节的固有频率高于动力元件的固有频率，电液伺服阀的传递函数还可用一阶惯性环节表示。当电液伺服阀的固有频率远大于动力元件的固有频率时，电液伺服阀可看成比例环节。
PCL401-04-UT04-002派克进口液压阀二阶近似的传递函数可由下式估计式中，ωsv为电液伺服阀的固有频率，定义为电液伺服阀相频特性曲线相位滞后90°所对应的频率；ζsv为电液伺服阀的等效阻尼比。下面将给出Wsv和ζsv的计算方法。
由式（5-65）可得电液伺服阀的相位滞后角度
由伺服阀固有频率的定义可知，将ωsv代入上式，滞后角等于90°，因此可得
由自动控制原理可知，对各种不同的阻尼比，都有一条对应的相频特性曲线。因此也可以将电液伺服阀的相频特性曲线与此对照，通过比较确定ζsv值。
电液伺服阀一阶近似的传递函数可由下式估计式中，ωsv为电液伺服阀的固有频率，ωsv=Kvf或取频率特性曲线上相位滞后45°所对应的频率。
5.2.3 频宽计算
在双喷嘴挡板力反馈两级电液伺服阀的闭环传递函数式（5-65）中，由于Kvf是最低的转折频率，所以整个电液伺服阀的频宽主要由Kvf决定。下面根据频宽的定义近似估计电液伺服阀的频宽。
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