DESIGN LAB (18MEL77)

DESIGN LAB

Course Code 18MEL77
CIE Marks 40
Teaching Hours /Week (L:T:P) 0:2:2 
SEE Marks 60
Credits 02
Exam Hours 03

Course Learning Objectives:

 To understand the concepts of natural frequency, logarithmic decrement, damping and damping ratio.
 To understand the techniques of balancing of rotating masses.
 To verify the concept of the critical speed of a rotating shaft.
 To illustrate the concept of stress concentration using Photo elasticity.
 To appreciate the equilibrium speed, sensitiveness, power and effort of a Governor.
 To illustrate the principles of pressure development in an oil film of a hydrodynamic journal bearing.

Experiments

PART - A

1 Determination of natural frequency, logarithmic decrement, damping ratio and damping coefficient in a single degree of freedom vibrating systems (longitudinal and torsional).
2 Balancing of rotating masses
3 Determination of critical speed of a rotating shaft
4 Determination of equilibrium speed, sensitiveness, power and effort of Porter/Proell /HartnelGovernor.

PART - B

5 Determination of Fringe constant of Photo-elastic material using.
a) Circular disc subjected to diametral compression.
b) Pure bending specimen (four-point bending.
6 Determination of stress concentration using Photo-elasticity for simple components like a plate with a hole under tension or bending, circular disk with the circular hole under compression, 2D Crane hook
7 Determination of Pressure distribution in Journal bearing
8 Determination of Principal Stresses and strains in a member subjected to combined loading using Strain
9 Doesteetrtmesin. ation of stresses in Curved beam using a strain gauge.

Course Outcomes: At the end of the course, the student will be able to:

CO1: Compute the natural frequency of the free and forced vibration of single degree freedom systems, critical speed of shafts.
CO2: Carry out balancing of rotating masses.
CO3: Analyse the governor's characteristics.
CO4: Determine stresses in disk, beams, plates, and hook using a photoelastic bench.
CO5: Determination of Pressure distribution in Journal bearing
CO6: Analyse the stress and strains using strain gauges in compression and bending test and stress distribution in curved beams.

Conduct of Practical Examination:

1. All laboratory experiments are to be included for practical examination.
2. Breakup of marks and the instructions printed on the cover page of the answer script to be strictly adhered to by the examiners.
3. Students can pick one experiment from the questions lot prepared by the examiners.

Scheme of Examination:

One question from Part A: 40 marks
One question from Part B: 40 Marks
Viva voce: 20 Marks
Total: 100 Marks