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Design of an ADRC Controller based on ESO to Control Size of Droplet in Micro Electro-Hydrodynamic

Mohammadi, Sasan | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53211 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Haeri, Mohammad
  7. Abstract:
  8. This thesis is related to the identification and design of a robust controller for an electrohydrodynamic printer system. As an emerging technology, this printer uses a strong electric field to deliver fluid ink from various conductive materials to the substrate. Modeling this system is complex due to the effect of different variables on its performance. In this project, first a simplified model with numerical solution data of the COMSOL model that is validated experimentaly is proposed. Then, by presenting a new control method that is a variant of an active disturbance rejection control baesd on extended state observer has been controlled. The new control method is actually an amendment to the control of multiple integrator systems in the presence of input saturation. The problem with the nested saturated feedback control is that there is no control over the first state variable until the input effect reaches this state. This defect can cause practical instability for high-order integrator systems. Here, the time convergence problem of the nested saturated feedback control is solved by presenting a modified extended state observer that is steemed from active disturbance rejection method. In continuance, the efficiency of the proposed method in the case of third order integrator system is examined and it is shown that the transient and steady state performances of the system are significantly improved compared to the existing methods. Proof of the stability of this new control method for nested saturation in the presence of external perturbations is provided. In the next step, based on obtained dynamic model for the printer, the two new controllers along with a PID controller are designed and according to the results, the best controller is implementsd in COMSOL software, which emulates a more realistic model of the process
  9. Keywords:
  10. Electrohydrodynamic Printer ; Stability Analysis ; External Disturbance ; Multiple Integrator Systems ; Active Disturbance Rejection Control (ADRC) ; Nested Saturated Feedback Controller ; Modified Extended State Observer ; COMSOL Software

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