An electric ventricular assist device (EVAD) that helps pump blood concurrently to a defective natural heart in sick patients can be shown to have a transfer function G(s) = Pao(s)/Em(s) =1361/ s2 + 69s + 70.85The input, Em(s) is the motor's armature voltage, and the output is Pao(s), the aortic blood pressure (Tasch, 1990). The EVAD will be controlled in the closed-loop configuration shown
