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Dynamics of MachineryExplain partial balancing of locomotives and derive the expression for hammer blow.20267mDynamics of MachineryA connecting rod is suspended from a point 25 mm above the centre of the small end, and 650 mm above its centre of gravity, its mass being 37.5 kg. When permitted to oscillate, the time period is found to be 1.87 seconds. Find the dynamically equivalent system constituted of two masses, one of which is located at the small-end centre.20267mDynamics of MachineryThe 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.20267mDynamics of MachineryThe purpose of balancing reciprocating masses is to: (i) Increase engine temperature (ii) Reduce unbalanced forces and couples (iii) Increase friction (iv) Reduce fuel supply.20262m
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