MEEG 206
Theory of Machines
3 Cr.
Objective:
To familiarize with the relative motion of different machine parts and the forces acting on them
To give aid for designing of various parts of a machine and other components.
Description
MODULE 1:
Basic Concepts 6 Hours Lecture + 4 Hours Tutorial
Mechanism and machine, constrained and unconstrained motion, resistant and rigid body, link, kinematic pair, kinematic chain and inversions; degrees of freedom and mobility of mechanism, Types of kinematic chain: four bar chain mechanism. Single slider crank and double slider crank mechanism, Inversion of mechanism, position and displacement analysis, velocity analysis of simple mechanism.
MODULE 2:
Cams 3 hrs Lecture + 5 hrs Tutorial
Types of cams; types of followers; Cam Nomenclature, Layout of cam profile, graphical methods for uniform velocity, Simple harmonic motion, uniform acceleration and retardation, and cycloidal motion;
MODULE 3:
Balancing of revolving masses 3 hrs Lecture + 3 hrs Tutorial
Balancing of revolving masses: Static and dynamic balancing; Balancing cases, effect of single mass & several masses in the same plane & several planes (analytic and graphical method).
MODULE 4:
Gears 6 hrs Lecture + 4 hrs Tutorial
Types of gear, Spur gear, Helical gear, bevel and helical gears; Gears terminologies, Gear ratio, Law of gearing, characteristics of involutes profile gears, path of contact, arc of contact, number of pairs of teeth in contact, Interference and method of avoiding it.
MODULE 5:
Gear Trains 3 hrs Lecture + 5 hrs Tutorial
Types of gear train, Simple, compound, reverted and epicyclic gear train; gear train solution: tabular method only.
MODULE 6:
Belt and rope drives 3 hrs Lecture + 3 hrs Tutorial
Belt drive, types of belt, types of flat belt drive, velocity ratio, slip of belt; effect of slip on velocity ratio, length of belt drive, power transmitted by belt, ratio of driving tension.
MODULE 7:
Vibration 2 hrs Lecture
Natural and forced vibration; transmissibility; damping and whirling of shafts. Natural frequency and critical speed. Multirotor system. Torsional vibration. Two and three rotor systems; Nodes.
Evaluation:
25% In Semester 75% End Semester
Assignment:
• There will be one or two assignments after each module depending upon the requirement of the individual module.
Class Test/Internal test:
• There will be several class test and class practice test on each module.
• Internal test will be held on the regular schedule published by the department. There may be two internals.
• The final internal marks will be the average of all test marks.
Project/Presentation:
• At the end of the course, students have to complete one mini project (fabrication based) related to the subjects, mainly in different mechanism.
• There will be three to four students in a group.
• The marks will be based on complete fabrication of the product, demonstration of the product and final presentation.
References:
Course Book:
1. P L Ballaney, “Theroy of aMachine”.
Reference Books:
2. R.S Khurmi, J.K Gupta,” Theory of Machine”, S.I. Units
3. Ashok G. Ambekar, “Mechanism and Machine theory”.
4. Dr. Jagadishlal, "Theory of machines", Metropolitan Book Co.
5. Bevan Thomas, "Theory of machine", CBS Publications
6. Mable & Ocvirk, "Mechanism and Dynamics of Machinery", John Wiley & Sons.
Others:
1. Course Handouts/Slides