  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.
