The application of a polynomial fit based simulation method in hydraulic actuator control system

With the development of aerospace technology, the method which uses linear model to represent the nonlinear component is not able to match the fault detection perfectly in hydraulic actuator control system. This paper proposes a polynomial fit based simulation method to build nonlinear model in hydraulic actuator control system. This method is used to simulate two kinds of typical hydraulic actuator control system. Contrastively, a simulation with traditional linear model is also executed. Through comparison among the result of two kinds of simulation and the test data, it is proved that this polynomial fit based method is more accurate than the traditional method and it can perform more effectively for fault detection in hydraulic actuator control system.