{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

B511F09h1 - DUE SEPT 10 AT 9:30 AM BME-511 Homework Set#1...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
BME-511 Homework Set #1 Fall 2009 1. Assume that the block diagram of a temperature-regulating space-suit to be worn by an astronaut for a mission to Mars is as shown in Figure 1. The variable "X" represents the external temperature while "Y" represents the temperature inside the space-suit. "G c " is the steady state gain of the heating/cooling device (controller) built into the space-suit, while "G p " represents the steady state gain associated with the thermal characteristics of the astronaut. "H" is the gain with which the internal temperature is fed back to the controller. The operating internal temperature (Y) is allowed to range from 60 o F to 100 o F. Assume that G c = 2, G p = 1, and H = 7. (a) What range of external temperatures can this space-suit be used for, if it is deployed in open-loop mode? (b) What is the permissible range of external temperatures when the space-suit is deployed in closed-loop mode? (c) Based on the results obtained in (a) and (b), what can you conclude about the effect of negative feedback in this device. 2. The cardiac output curve of a heart that has been transplanted into a patient is given in tabular form as follows: Right Atrial Pressure 0 1 2 3 4 5 6 7 8 9 10 11 12 13 (mmHg) --------------------------------------------------------------------------------------------------------------------- Cardiac Output 0 0.3 1.0 2.5 4.8 7.0 9.0 10.5 11.0 11.3 11.5 11.6 11.6 11.6 (L min -1 ) Suppose the venous return characteristics of the patient's systemic circulation can be expressed in the form of the following equations: Q R = 14 P ra 0 = 14 - 2 P ra 0 < P ra < 7 = 0 P ra 7 (a) Deduce the patient's steady-state right atrial pressure (P ra
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern