ME8492 – NOTES & QP
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ME8492 – SYLLABUS
UNIT I BASICS OF MECHANISMS
Classification of mechanisms — Basic kinematic concepts and definitions — Degree of freedom, Mobility — Kutzbach criterion, Gruebler?s criterion — Grashof?s Law — Kinematic inversions of four-bar chain and slider crank chains — Limit positions — Mechanical advantage — Transmission Angle — Description of some common mechanisms — Quick return mechanisms, Straight line generators, Universal Joint — rocker mechanisms.
UNIT II KINEMATICS OF LINKAGE MECHANISMS
Displacement, velocity and acceleration analysis of simple mechanisms — Graphical method– Velocity and acceleration polygons — Velocity analysis using instantaneous centres — kinematic analysis of simple mechanisms — Coincident points — Coriolis component of Acceleration — Introduction to linkage synthesis problem.
UNIT III KINEMATICS OF CAM MECHANISMS
Classification of cams and followers — Terminology and definitions — Displacement diagrams –Uniform velocity, parabolic, simple harmonic and cycloidal motions — Derivatives of follower motions — Layout of plate cam profiles — Specified contour cams — Circular arc and tangent cams — Pressure angle and undercutting — sizing of cams.
UNIT IV GEARS AND GEAR TRAINS
Law of toothed gearing — Involutes and cycloidal tooth profiles –Spur Gear terminology and
definitions –Gear tooth action — contact ratio — Interference and undercutting. Helical, Bevel, Worm, Rack and Pinion gears [Basics only]. Gear trains — Speed ratio, train value — Parallel axis gear trains — Epicyclic Gear Trains.
UNIT V FRICTION IN MACHINE ELEMENTS
Surface contacts — Sliding and Rolling friction — Friction drives — Friction in screw threads — Bearings and lubrication — Friction clutches — Belt and rope drives — Friction in brakes- Band and Block brakes.