Optimized Design and Analysis of an Electric Ventricular Assist Device Control System

Abstract

For cardiac surgery control, patient requires one efficient control system for electric ventricular assist device. The total control system concerned may be considered to consist of motor pump and blood sac in cascade with a cardiovascular system and suitable compensator operated in the closed loop manner with negative feedback path. In the present work for mathematical comfortability the negative feedback path is considered to have unity gain. The optimality of the performance for the system is considered to be attained with gain of the Proportional Integral (PI) compensator so chosen that the integral square error (ISE) becomes a minimum. The present work considers the minimization using particle swarm optimization (PSO) which searches the maxima of the reciprocal of the ISE within the range of the value of the system gain as obtained by Routh Hurwitz criterion. The overall system is found to be stable, controllable and observable. The system is also analyzed in sampled data control domain (z domain). The stability in z domain is analyzed using Jury’s Stability test. MATLAB software is appropriately used in the entire analysis.  The overall system offers an indepth sight for the biomedical engineering application of the control system of an electric ventricular assist device for cardiology patients operated under  optimal condition.