Patients with a cardio logical illness

Reference no: EM131127672

Patients with a cardio logical illness and less than normal heart muscle strength can benefit from an assistance device. An electric ventricular assist device (EVAD) converts electric power into blood flow by moving a pusher plate against a flexible blood sac. The pusher plate reciprocates to eject blood in systole and to allow the sac to fill in diastole. The EVAD will be implanted in tandem or in parallel with the intact natural heart as shown in Figure AP9.11 (a). The EVAD is driven by rechargeable batteries, and the electric power is transmitted inductively across the skin through a transmission system. The batteries and the transmission system limit the electric energy storage and the transmitted peak power. We desire to drive the EVAD in a fashion that minimizes its electric power consumption [33].

The EVAD has a single input, the applied motor voltage, and a single output, the blood flow rate. The control system of the EVAD performs two main tasks: It adjusts the motor voltage to drive the pusher plate through its desired stroke, and it varies the EVAD blood flow to meet the body's cardiac output demand. The blood flow controller adjusts the blood flow rate by varying the EVAD beat rate. A model of the feedback control system is shown in Figure AP9.11 (b). The motor, pump, and blood sac can be modeled by a nominal time delay with T = 1 s. The goal is to achieve a step response with zero steady-state error and percent overshoot P.O. ≤ 10%.

Consider the controller

For the nominal time delay of T = 1 s, plot the step response and verify that steady-state tracking error and percent overshoot specifications are satisfied. Determine the maximum time delay, T, possible with the PID controller that continues to stabilize the closed loop system. Plot the phase margin as a function of time delay up to the maximum allowed for stability.

Reference no: EM131127672

Questions Cloud

What basic principle of finance can be applied to the valuat : What basic principle of finance can be applied to the valuation of any investment asset?

What are the advantages of such a paging scheme : Consider a system that allocates pages of different sizes to its processes. What are the advantages of such a paging scheme? What modi?cations to the virtual memory system provide this functionality?

Compute the transfer function : A multi loop block diagram is shown in Figure AP9.10. (a) Compute the transfer function T(s) = Y(s)/R(s).

Prepared the following unadjusted trial balance : The balance in unearned fees represented the February 1 receipt in advance for services to be provided. Only$1,600 of the services was provided between February 1 and February 28.

Patients with a cardio logical illness : Patients with a cardio logical illness and less than normal heart muscle strength can benefit from an assistance device. An electric ventricular assist device (EVAD) converts electric power into blood flow by moving a pusher plate against a flexib..

Different theories define deviance and punishment in society : Examine the three (3) key sociological theories discussed in the chapter-structural functionalism, conflict theory, and symbolic interactionism. Discuss the key ways that these different theories define deviance and punishment in society

Find the frequency of oscillation : Calculate the minimum value of Ro that will cause oscillation to occur.

Response of this system to a step input : The system of Figure CDP4.1 uses a controller Gc(t) = Ka. Determine the value of Ka so that the phase margin is 70°. Plot the response of this system to a step input.

Analyze the information on the basis of the sara model : Outline an action plan that partners the specific stakeholders, the community, and law enforcement. Integrate the cultural issues and past problems that resulted in the chief being replaced (from the LASA 1 report). Explain how the city will know..

User Account

All Pages