Autonomous Human Body Control, Part XV: Intradialytic Hypotension Control during Hemodialysis using First-order and D-P Compensators Compared with a PD Controller | IJCT Volume 12 – Issue 5 | IJCT-V12I5P67

This paper is the fifteenth in a series of research papers presenting the control of an autonomous human body. It handles the control of the intradialytic diastolic blood pressure in human hemodialysis operations using a first order and a D-P compensators from the second generation of control compensators. Some tuning techniques for the proposed controller/compensators are proposed based on zero/pole cancellation and fulfilling some time-based characteristics for the closed-loop control system. The step time response of the control system using the investigated controller/compensators is presented and compared with that of a conventional PD controller from the first generation of PID controllers tuned by the author. The comparison reveals the best controller/compensator among the three ones presented depending on a graphical and quantitative comparison study for reference input tracking

-This research paper investigated the use of first order and D-P compensators from the second generation of control compensators compared with a PD controller from the first generation of PID controllers to control the diastolic blood pressure a human body during hemodialysis. -The process under control was identified as an unstable process having a first order + an integrator process transfer function without time delay. -The performance of the proposed controller/compensators was assigned through the investigation of the step time response of the control system comprising the controller/compensator and the DBP process. -The tuning technique used to optimize the controller/compensator parameters was based on the zero/pole cancellation technique and fulfilling specific requirements for the settling time and the steady state of the control system. -The three proposed controller/compensators succeeded to eliminate completely the maximum percentage overshoot of the closed-loop control system for reference input tracking. -The settling time of the step input tracking time response (for 2 % tolerance) was assigned to be only half an hour for the three controller/compensators indicating fast time response compared with infinity for the uncontrolled DBP process. -With the proposed controller/compensators it is possible to select any value for the settling time where the controller/compensator parameters will change accordingly. -The three proposed controller/compensators succeeded to provide a step time response having a delay time less than 0.144 h. -The three proposed controller/compensators succeeded to provide a step time response having a rise time less than 0.288 h. -Through the tuning approaches used it was possible for the proposed controller/ compensators provided step time response to step input tracking without steady-state error. -The PD controller and the D-P compensator proved in this application to be the best controller/compensator because of their ideal step shape without any overshoot, undershoot or steady-state error. However, the D-P compensator was selected as the best controller/compensator because of its simple design without summing point electronic circuit.

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