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

The input, E_m(s), is the motor’s armature voltage, and the output is P_ao(s), the aortic blood pressure (Tasch, 1990). The EVAD will be controlled in the closed-loop configuration shown in Figure P11.1.

a. Design a phase lag compensator to achieve a tenfold improvement in the steady-state error to step inputs without appreciably affecting the transient response of the uncompensated system.

b. Use MATLAB to simulate the uncompensated and compensated systems for a unit step input.

                                       

Transcribed Image Text:

Pao(s) Em(s) s2 + 69s +70.85 1361 G(s) =