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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 2 Examinations 2011/
Module Title: Biomechanics & Biofluids
Module Code: BIOE
School: Mechanical and Process Engineering
Programme Title: Bachelor of Engineering in Biomedical Engineering – Year 3
Programme Code: EBIME_7_Y
External Examiner(s): Mr Gary Clerkin, Dr Laoise McNamara Internal Examiner(s): Mr Keith Bryan, Ms Aoife Burke
Instructions: Attempt any 3 questions Use seperate answer books for each section
Duration: 2 Hours
Sitting: Summer 2012
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
Section A
Q1. Figure Q1 shows a person doing shoulder abduction in the frontal plane. O represents the axis of rotation of the shoulder joint in the frontal plane, Line OA represents the position of the arm when it is stretched out parallel to the ground (horizontal), Line OB represents the position of the arm when the hand is at its highest elevation, and line OC represents the position of the arm when the hand is closest to the body. The motion of the arm is symmetric about the line OA. Derive expressions for: (i) angular displacement of the arm (6 marks) (ii) velocity of the arm (7 marks) (iii) acceleration of the arm (7 marks) Take the period of angular motion of the arm to be 3 seconds and the angle 0 to be 80.
Q2. It is proposed to design a loop section in a motor cycle stunt track as shown in figure Q2.
Figure Q (a) If the total mass of the rider and motorcycle is 150kg and the motor cycle is able to maintain a constant velocity of 7m/s at all angles. Calculate: Continued /......
Figure Q
(c) A Newtonian fluid with steady laminar flow through a blood vessel records the shear rate and shear stress values below. Calculate the pressure drop in the blood vessels if the flowrate is 450 L min-1, the blood vessel diameter is 4cm and length 5m.
Shear Rate (s-^1 ) 1.0 2.0 3.0 4.0 5. Shear Stress 0.006 0.012 0.018 0.024 0.
(8 marks)
Q4 (a) Detail and illustrate the three layers within a blood vessel. (6 marks)
(b) What is the relationship between stenosis of coronary arteries, turbulent flow of blood and ischemic strokes. (4 marks)
(c) Discuss mechanical wear processes under the following headings: (i) Interfacial wear (ii) Fatigue wear (6 marks) (d) Describe the following proposed mechanisms of joint lubrication (i) Elasto-hydrodynamic lubrication (ii) Weeping/self lubrication (4 marks)
