ABSTRACT
High-speed on-off valves are widely used in PWM electropneumatic servo systems and their characteristics are generallly described by their on and off delay time. This paper focuses on establishing the relationships between their on-off switching behaviors and their frequency response characteristics. A method is proposed by which the frequency response characteristics for an analog PWM high-speed on-off valve at the points that the periods of the input signal are certain times of the carrier ones can be calculated based on its switching behaviors. Then a simple and direct describing function for a PWM high-speed on-off valve is established based on the simulation.
