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Dynamics of MachineryFor a knife-edge follower, the cam profile is the same as the: (i) Pitch curve (ii) Base circle (iii) Prime circle (iv) Pitch circle.20262mDynamics of MachineryA roller follower is preferred over a knife-edge follower mainly because it: (i) Has higher friction (ii) Reduces wear and friction (iii) Requires no cam (iv) Cannot transmit motion.20262mDynamics of MachineryDraw the displacement, velocity and acceleration diagrams for a follower when it moves with uniform acceleration and retardation. Derive the expressions for velocity and acceleration during outstroke and return stroke.20267mDynamics of MachineryFor a two-cylinder locomotive with cranks at 90°: reciprocating mass per cylinder = 300 kg; crank radius = 0.3 m; driving wheel diameter = 1.8 m; distance between cylinder centre lines = 0.65 m; distance between driving wheel central planes = 1.55 m. Determine (i) the fraction of reciprocating masses to be balanced if hammer blow is not to exceed 46 kN at 96.5 km/h, (ii) variation in tractive effort, and (iii) maximum swaying couple.20267m
PreviousThe turning moment diagram for a petrol engine is drawn to these scales: turning moment, 1 mm = 5 N·m; crank angle, 1 mm = 1°. The diagram repeats itself at every half revolution of the engine. The areas above and below the mean turning moment line taken in turn are 295, 685, 40, 340, 960, 270 mm². The rotating parts are equivalent to a mass of 36 kg at a radius of gyration of 150 mm. Determine the coefficient of fluctuation of speed when the engine runs at 1800 r.p.m.NextDraw the displacement, velocity and acceleration diagrams for a follower when it moves with uniform acceleration and retardation. Derive the expressions for velocity and acceleration during outstroke and return stroke.
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