An Output Feedback Pusher Plate Controller for the Penn State Electric Ventricular Assist Device: Stability Analysis

[+] Author and Article Information
U. Tasch

Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD 21228

G. K. Klute

KRUG Life Sciences, Houston, TX 77058

D. B. Geselowitz

The Bioengineering Program, The Pennsylvania State University, University Park, PA 16802

J. Dyn. Sys., Meas., Control 112(4), 696-702 (Dec 01, 1990) (7 pages) doi:10.1115/1.2896197 History: Received March 01, 1989; Revised November 01, 1989; Online March 17, 2008


The development of an optimal output feedback controller for the Penn State electric ventricular assist device (EVAD) is addressed. The controller is designed to minimize the electric energy consumption of the EVAD, while utilizing the measured pusher plate position as the only feedback signal. The controller incorporates statistical information of the targeted patient population and optimizes the expected value of the system performance. The present paper shows that the optimal output feedback control scheme is asymptotically stable when the EVAD operates in a steady beat rate mode, and bounded-input/bounded-output stable when the beat rate undergoes a transient. Since the EVAD operates in either steady or transient beat rate modes, this optimal control scheme is stable.

Copyright © 1990 by The American Society of Mechanical Engineers
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