双级气流场压力解耦控制研究

Decoupling Control Research of Double-level Air Current Field

针对温度、压力、湿度多参数复合计量检定装置中双温双压法湿度发生的上级饱和气体压力和下级实验舱气体压力控制具有强耦合关系,提出了一种基于对角矩阵的双极气流场解耦方法。该方法利用理想气体状态方程和调节阀流量特性建立双输入双输出气流场控制模型,运用对角矩阵法将原系统变为两个独立的单输入单输出控制系统,消除两者之间的耦合关系。实验结果表明:该方法取得了很好的效果,饱和器和实验舱的压力控制稳态精度都得到大幅度提高。

To solve the strong coupling influence between the upper air pressure and the lower air pressure in the temperature,pressure and humidity composite metrological verification device,a double-level air current field decoupling control method based on diagonal matrix was presented. With the state equation of ideal gas and the flow characteristics of the valve,the double input and double output airflow field control model was built. Using diagonal matrix method,the original control system became two independent single input single output control systems. The coupling relationship was eliminated well. The experiment results indicate that this method is effective in improving the air pressure control precision of the saturator and experiment box.