Pneumatic rotary actuator angle control system

Based on the adaptive control method, a kind of parameter adjuster was used to control pneumatic rotary actuator to track the expected output. The system uses electropneumatic proportional valve as control device, which adjusts the gas flow of actuator's two cavities and changes the pressure of cavity and pushes the piston of actuator to move, so the rotary actuator's axis can be made to revolve to the required angle at last. According to the characteristic of pneumatic system, the control system was described with a fourth-order mathematic model. The control rule is deduced by model reference adaptive control method. By the result of experiment, it was proved that by using the adaptive control method, the output of rotary actuator could track the expected value in time and accurately.