KINEMATICS OF MACHINERY

KINEMATICS OF MACHINERY                                                                         3  1  0 4

OBJECTIVE

·          To understand the concept of machines, mechanisms and related terminologies.

·          To analyse a mechanism for displacement, velocity and acceleration at any point in a moving link

·          To understand the theory of gears, gear trains and cams

·          To understand the role of friction in drives and brakes.

UNIT I             BASICS OF MECHANISMS                                                             7(L) Definitions – Link, Kinematic pair, Kinematic chain, Mechanism, and Machine. -Degree of  Freedom  –  Mobility  -  Kutzbach  criterion  (Gruebler’s  equation)  -Grashoff's  law- Kinematic Inversions of four-bar chain and slider crank chain - Mechanical Advantage- Transmission angle.

Description  of  common  Mechanisms  -  Offset  slider  mechanism  as  quick  return mechanisms, Pantograph, Straight line generators (Peaucellier and Watt mechanisms), Steering  gear  for  automobile,  Hooke’s  joint,  Toggle   mechanism,   Ratchets   and escapements - Indexing Mechanisms.

UNIT II            KINEMATIC ANALYSIS                                                            10(L)+5(T)

Analysis  of   simple   mechanisms  (Single   slider  crank   mechanism  and  four  bar mechanism) - Graphical Methods for displacement, velocity and acceleration; Shaping machine mechanism - Coincident points – Coriolis acceleration - Analytical method of analysis of slider crank mechanism and four bar mechanism.   Approximate analytical expression for displacement, velocity and acceleration of piston of reciprocating engine mechanism.

UNIT III           KINEMATICS OF CAMS 

                                                            8(L)+3(T)

Classifications - Displacement diagrams - Parabolic, Simple harmonic and Cycloidal motions – Graphical construction of displacement diagrams and layout of plate cam profiles - circular arc and tangent cams -  Pressure angle and undercutting.

UNIT IV           GEARS                                                                                        10(L)+4(T)

Classification of gears – Gear tooth terminology - Fundamental Law of toothed gearing and involute gearing – Length of path of contact and contact ratio - Interference and undercutting - Gear trains – Simple, compound and Epicyclic gear trains - Differentials.

UNIT V            FRICTION                                                                              10(L)+3(T)

Dry friction – Friction in screw jack – Pivot and collar friction - Plate clutches - Belt and rope drives - Block brakes, band brakes.

Total Number of Periods: L= 45     T= 15 60

TEXT BOOKS

1.  Ambekar A. G., Mechanism and Machine Theory, Prentice Hall of India, New

Delhi, 2007.

2.  Uicker    J.J.,Pennock    G.R.,    Shigley    J.E.,    “Theory    of    Machines    and

Mechanisms”(Indian Edition), Oxford University Press, 2003.

REFERENCE BOOKS

1.  Thomas Bevan, “Theory of Machines”, CBS Publishers and Distributors, 1984.

2.  Ramamurti,V.,’  Mechanism  and  Machine  Theory”,  Second  Edition,  Narosa

Publishing House, 2005

3.  Ghosh A and A.K.Mallick, “Theory of Mechanisms and Machines”, Affiliated East- West Pvt. Ltd., New Delhi, 1998.

4.  Rao J.S and Dukkipati R.V, “Mechanism and Machine Theory”, Wiley-Eastern

Ltd., New Delhi, 199 2.

5.  John Hannah and Stephens R.C, “Mechanics of Machines”, Viva Low-Prices

Student Edition, 1999