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SYLLABUS

UNIT-I

FRICTION Inclined plane, Friction of Screws and Nuts, Pivot and Collar, Uniform pressure, Uniform wear – Friction circle and friction axis – Lubricated surfaces, Boundary friction, Film lubrication. CLUTCHES Friction clutches- Single disc or plate clutch, Multiple disc clutch, Cone clutch, Centrifugal clutch. BRAKES AND DYNAMOMETERS Simple block brakes, Band brake, Internal expanding brake, Braking of vehicle – Dynamometers – Absorption and transmission types – General description and methods of operation.

UNIT-II

PRECESSION Gyroscopes – Effect of precession motion on the stability of moving vehicles such as Motor car, Motor cycle, Aeroplanes and Ships. TURNING MOMENT DIAGRAMS AND FLYWHEELS Turning moment diagrams for Steam engine – IC engine and multi cylinder engine – Crank effort - coefficient of fluctuation of energy – Coefficient of fluctuation of speed – Fly wheels and their design – Fly wheels for punching machines.

UNIT-III

GOVERNORS Watt, Porter and Proell governors – Spring loaded governors – Hartnell and Hartung governors with auxiliary springs. Sensitiveness, Isochronism and hunting – Effort and power of a governor.

UNIT-IV

BALANCING Balancing of rotating masses – Single and Multiple – Single and different planes. BALANCING OF RECIPROCATING MASSES Primary and secondary balancing of reciprocating masses – Analytical and graphical methods – Unbalanced forces and couples – V-engine, Multi cylinder, Inline and Radial engines for primary and secondary balancing.

UNIT-V

VIBRATIONS Free and Forced vibration of single degree of freedom system – Role of damping – Whirling of shafts and critical speeds – Simple problems on Free, Forced and Damped vibrations – Vibration Isolation & Transmissibility – Transverse vibrations of beams with concentrated and distributed loads – Dunkerly’s method, Raleigh’s method. Torsional vibrations - Two and three rotor systems.