Key result
The proposed supervisory control scheme demonstrated a pressure undershoot less than 10 mmHg while maintaining Mean Arterial Pressure within ±5 mmHg of the desired value in simulations.
Why the study?
Time delay is inherent in various applications, motivating the design of supervisory control structures for Linear Parameter Varying systems with delays to enhance closed-loop performance over a single robust controller.
A novel supervisory control structure for LPV systems with time delays effectively regulated simulated mean arterial pressure in a postoperative hypertension model.
Answers are grounded in this paper and cite their sources.
Should not change practice; leaves open in vivo validation of simulation-based MAP control.
Linear Parameter Varying (LPV) systems and their control have gained attraction recently as they approximate nonlinear systems with higher order than ordinary linear systems. On the other hand, time delay is an inherent part of various real-life applications. A supervisory control structure is proposed in this paper for LPV systems subject to time delays. In the proposed control structure, a supervisor selects the most suitable controller from a bank of controllers; which desires to enhance the performance of closed-loop system in contrast with using a single robust controller. The analysis is based on the celebrated Smith predictor for time delay compensation and we provide a sufficient condition to assure the stability of the closed-loop switched system in terms of dwell time. Simulations on blood pressure control of hypertension patients in postoperative scenario are used to exemplify the effectiveness of the utilized technique. The operating region of the system is partitioned into five smaller operating regions to construct corresponding robust controllers and perform hysteresis switching amongst them. Simulation results witnessed that the proposed control scheme demonstrated a pressure undershoot less than the desired value of 10 mmHg while the Mean Arterial Pressure (MAP) remains within ±5 mmHg of the desired value.
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Zahid et al. (2021) studied Hypertension (simulated postoperative scenario). Supervisory control structure with hysteresis switching vs. Single robust controller was evaluated on Pressure undershoot and Mean Arterial Pressure (MAP) regulation. The proposed supervisory control scheme demonstrated a pressure undershoot less than 10 mmHg while maintaining Mean Arterial Pressure within ±5 mmHg of the desired value in simulations.
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