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| Extended state observer‑based pressure control for pneumatic actuator servo systems |
| JohnMohorcic,LiliDong |
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| (Delta Systems Inc., Streetsboro, OH 44241, USA;Department of Electrical Engineering and Computer Science, Cleveland State University, Cleveland, OH 44115, USA) |
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| DOI：https://doi.org/10.1007/s11768-021-00038-y |
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| Extended state observer‑based pressure control for pneumatic actuator servo systems |
| John Mohorcic,Lili Dong |
| (Delta Systems Inc., Streetsboro, OH 44241, USA;Department of Electrical Engineering and Computer Science, Cleveland State University, Cleveland, OH 44115, USA) |
| Abstract: |
| A pneumatic actuator is a fast and economical tool that converts compressed air into mechanical motion. In this paper, an extended state observer (ESO)-based sliding mode controller (SMC) is developed to adjust the air pressure of the actuator for accurate position control. Specifcally, an impedance control module is established to produce desired air pressure based on the relationship between forces and desired positions. Then, the ESO-based SMC is implemented to adjust the air pressure to the required level despite the presence of system uncertainties and disturbances. As a result, the position of the actuator is controlled to a setpoint through the regulation of pressure. The performance of ESO-based SMC is compared with that of a classic active disturbance rejection controller (ADRC) and a SMC. Simulation results demonstrate that the ESO-based SMC shows comparable performance to ADRC in terms of precise pressure control. In addition, it requires the least control efort necessary to excite valves among the three controllers. The stability of ESO-based SMC is theoretically justifed through Lyapunov approach. |
| Key words: Pneumatic actuator · Pressure control · ESO-based SMC · ADRC · Impedance control module · Stability proof · Lyapunov approach |
