18AE44 Mechanisms And Machine Theory syllabus for AE

Introduction to Mechanisms:

Types of constrained motion, Link and its types, joints and its types, kinematic pair and its types, degrees of freedom, Grubler’s criterion, Types of kinematic chains and inversions: Inversions of Four bar chain: Beam engine, coupling rod of a locomotive, Watt’s indicator mechanism. Inversions of Single Slider Crank Chain: Pendulum pump or Bull engine, Oscillating cylinder engine, Rotary internal combustion engine, Crank and slotted lever quick return motion mechanism, Whitworth quick return motion mechanism. Inversions of Double Slider Crank Chain: Elliptical trammels, Scotch yoke mechanism, Oldham’s coupling. Straight line motion mechanisms: Peaucellier’s mechanism and Robert’s mechanism. Intermittent Motion mechanisms: Geneva wheel mechanism and Ratchet and Pawl mechanism, Ackerman steering gear mechanism.

Velocity, Acceleration and static force analysis of Mechanisms (Graphical Methods):

Velocity and acceleration analysis of Four Bar mechanism, slider crank mechanism and Simple Mechanisms by vector polygons.

Static force analysis:

Introduction: Static equilibrium, Equilibrium of two and three force members. Members with two forces and torque. Free body diagrams, principle of virtual work. Static force analysis of four bar mechanism and slider-crank mechanism with and without friction.

Spur Gears and Gear Trains

Spur Gears:

Gear terminology, law of gearing, Path of contact, Arc of contact, Contact ratio of spur gear, Interference in involute gears, Methods of avoiding interference.

Gear Trains:

Simple gear trains, Compound gear trains, Reverted gear trains, Epicyclic gear trains, Analysis of epicyclic gear train (Algebraic and tabular methods), torques in epicyclic trains.

Balancing of Rotating and Reciprocating Masses

Balancing of Rotating Masses:

Balancing of Several Masses Rotating in the Same Plane, Balancing of Several Masses Rotating in Different Planes (only Graphical Methods).

Balancing of Reciprocating Masses:

Primary and Secondary Unbalanced Forces of Reciprocating Masses, Partial Balancing of Unbalanced Primary Force in a Reciprocating Engine, Balancing of Primary and secondary Forces of Multi-cylinder In-line Engines, Balancing of Radial Engines (only Graphical Methods)

Governors and Gyroscope

Governors:

Types of governors; force analysis of Porter and Hartnell governors, Controlling force, stability, sensitiveness, isochronism, effort and power of Porter and Hartnell governors.

Gyroscopes:

Vectorial representation of angular motion, gyroscopic couple, effect of gyroscopic couple on plane disc and aeroplane

Course Outcomes:

At the end of the course the student will be able to:

1. CO1: Apply the theory of velocity, acceleration and static force analysis to design of mechanisms.

2. CO2: Design spur gears, gear train, balancing of rotating and reciprocating masses.

3. CO3 : Apply governors and gyroscope

Question paper pattern:

• The question paper will have ten full questions carrying equal marks. Each full question consisting of 20 marks.
• There will be two full questions (with a maximum of four sub questions) from each module.
• Each full question will have sub question covering all the topics under a module.
• The students will have to answer five full questions, selecting one full question from each module.

Textbook/s

1 Theory of Machines Rattan S.S Tata McGraw-Hill Publishing Company Ltd., New Delhi 3rd edition -2009

2 Theory of Machines & Mechanisms J.J. Uicker, G.R. Pennock, J.E. Shigley OXFORD 3rd Ed. 2009

Reference Books

1 Theory of Machines R. S. Khurmi, J.K. Gupta Eurasia Publishing House 2008

2 Design of Machinery Robert L Norton McGraw Hill 2001

3 Mechanism and Machine theory Ambekar PHI Learning Pvt. Ltd 2007