Question

(a) [3 marks] In the LASER Displacement Sensing (LDS) set-up of Figure-3, the displacement of a target object is measured using triangulation technique. The optical centre of the imaging lens, O is placed at 70mm to the emitted LASER beam. When the target object is placed at mid-range of its measurement, the angle that it makes with the emitted and reflected LASER beam, Om, is measured as 30° while the angles measured at the start and end ranges are 35° and 25° respectively. Compute the full measurement range of the sensing system. What is the significance of triangulation method? LASER Diode Collimating Lens Photosensor array A Imaging Lens 90° Start Range direction + Displacement Mid Range End Range Figure-3: LASER Triangulation measurement (b) [2 marks] Perform a RCA (root cause analysis) using 5-whys method related to any adverse/undesired outcome for your industrial case-study that you did during the semester. (c) [3 marks] For the system of figure-4, cascaded system components are shown along with their reliability indices below each box. Compute the overall system reliability. Electronic conditioning Instrument R3 0.75 Electromechanical Mechanical System 1 R1 Sensing System R2 5th order Butterworth Filter Drive- Electronics R6 Instrument R5 R7 Mechanical System 2 R8 0.92 Electronic conditioning Instrument R4 0.82 0.77 0.8 0.88 0.9 0.7 Figure-4: System Reliability

Answer 1

c) L = 7on 35 aus 30d B А Range = + tonas 70 tan 145 zo ton 145 + ton 25 5o. 145 mm Significance - Tutangulation method helg to determine or measure the point located vory far withoust measwing its distance. We can cale later the distance by measuring its angle with Heference point- ot 16 Problem → The Conveyor belt of the mon production line_Stubbed working 1: Why the belt Stobbed, wo working → The pulley on which belt is mounted i not working or 1or rotating. (2. Why Pulley stubbed rotating ? → Because motor is not able to rotate it. 3 why motor is not able to totale Pulley? → The winding of the motor is twined. CS Scanned with CamScanner

4. Why the windings bwined out ? The motor worluing load is above its Rower capacity 15. Why was the motor overloaded. ? As there is no instruction of its load copacity No. of why may be more than 5 or les than Is uw is totally depends over the problem Statement and its root cause s) || System Reliability RS 0.9 x 0.82 X (1-0.15) (1–0.7)] x.0.17X0.8% 0-88X0.92 R = 0.738 x 0.925 X 0.4987136 TR = 0.34 CS Scanned with CamScanner