电液伺服阀阀芯粘性阻尼系数辨识方法研究

Study on Identification Method of Viscous Damping Coefficient of Electro Hydraulic Servo Valve Spool

电液伺服阀为电液伺服系统的核心元件,其模型的准确性关系到整个伺服系统模型的准确性,而阀芯粘性阻尼系数是电液伺服阀模型中的重要参数。因此,本文建立了一种基于动态测试方法的粘性阻尼系数测试系统。文章将该测试系统看作一个二阶模型系统,通过系统辨识的方法,可求解得到阀芯的粘性阻尼系数。试验结果证明了该测试及辨识方法的有效性和准确性,为电液伺服阀精确建模打下了坚实的基础,具有一定的工程应用价值。

Electro-hydraulic servo valve is a key component of electro-hydraulic servo systems. The accuracy of its model is closely related to the accuracy of the whole servo systems＇ model. Spool viscous damping coefficient is an important parameter for the model of electro hydraulic servo valve. Therefore, a viscous damping coefficient test system is established, which is based on a dynamic test method presented in this paper. The transfer function of the test system is regarded as a second-order model. By using system identification method, the viscous damping coefficient is able to be obtained. The validity and accuracy of the test and i- dentification method are proven by the experiment results that can serve as foundation for accuracy modeling of electro hydraulic servo valve and has certain practical significance.