大流量插装式伺服阀数学模型及试验验证

针对插装式伺服阀在高速大流量电液伺服系统中表现出的非线性特征，以及在理论分析时不能对其进行线性化处理等问题，对该阀内部构成机理进行了分析.将其先导级数学模型简化为一个线性二阶环节并对其输入输出变量进行限幅，对其主阀芯进行动力学分析.在此基础上建立了插装式伺服阀简单实用的非线性数学模型.在试验平台上验证了该模型的正确性.试验结果表明，该阀的阶跃响应存在较大的纯滞后，且阶跃响应时间随阶跃幅值的增加而增加.基于该数学模型的仿真结果与试验结果的对比表明，该模型能够较为准确地描述此类伺服阀的动静态特征，可应用于高速大流量电液伺服系统的理论分析.

Mathematical model and experimental verification of high flow cartridge servo valve

Mechanism analysis of the cartridge servo valve was done to solve problems that the cartridge servo valve exhibits serious nonlinear characteristics in the high velocity and high flow electro-hydraulic servo system and its mathematical model cannot be linearized in theoretical analysis.The pilot valve's model was simplified as a linear second-order equation with the ranges of the input and output variables limited,and kinetic analysis of the main spool was done.A compact nonlinear mathematical model of the cartridge servo valve was established.A test platform was set up to verify the mathematical model.The experimental results showed that the step response of the main spool displacement exhibits a great pure delay and the step response time increases with the step amplitude.Comparison between experiment and simulation based on the mathematical model showed accuracy of the model,which proved that the model could be applied to theoretical analysis of the high velocity and high flow electro-hydraulic servo system.