Hybrid Modeling Application in Control Valve

Abstract: In view of the serious nonlinearity, time-varying and parameter uncertainty in the physical model of regulating valve, a prediction model of flow rate and pressure of regulating valve based on mixed model was proposed.According to the physical model of the regulator, the parameters that can represent the operation state of the regulator are analyzed, and the relevant parameters are identified by unbiased LSSVM method.The DAMADICS simulation results show that the model can predict the output of flow rate and pressure with better accuracy, which can provide guidance for the design of automatic control valve or fault diagnosis system.