Illness and less than normal heart muscle strength

Assignment Help Basic Statistics

Reference no: EM131127722

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: EM131127722

Questions Cloud

Cause the system step response : A control system is shown in Figure AP9.8. The gain K is greater than 500 and less than 3000. Select a gain that will cause the system step response to have an overshoot of less than 20%. Plot the Nichols diagram, and calculate the phase margin.

Misfire company is a small editorial services company : On August 31, 2010, the end of the current year, Misfire Company's accounting clerk prepared the unadjusted trial balance shown on the next page.

What is the current price per share : Huskie Motors just paid an annual dividend of $1.00 per share. Management has promised shareholders to increase dividends at a constant rate of 5%. If the required return is 12%, what is the current price per share?

Specify whether the pf is leading or lagging : For the following voltage and current phasors, calculate the complex power, apparent power, real power, and reactive power. Specify whether the pf is leading or lagging.

Illness and less than normal heart muscle strength : 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..

What is the expected dividend growth rate for laserace : LaserAce is selling at $22.00 per share. The most recent annual dividend paid was $0.80. Using the Gordon growth model, if the market requires a return of 11%, what is the expected dividend growth rate for LaserAce?

Qualities that made him successful as leader : Michael Lewis (the author of Moneyball) writes of Billy Beane, “it was hard to know which of Billy’s qualities was most important to his team’s success.” A great leader usually will have many strong qualities (distinctive attributes or characteristic..

What is percent concentration of sugar in the resulting mix : Ten grams of sugar are added to a 40g serving of a breakfast cereal that is 30% sugar. What is the percent concentration of sugar in the resulting mix?

Discuss importance of having subject matter jurisdiction : It is common knowledge that jurisdiction, the official power to make legal decisions and judgments, is vitally important to the adversarial legal system. Discuss the importance of having either subject matter jurisdiction or personal jurisdiction ..

User Account

All Pages