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Dynamics 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.20267mDynamics of MachineryExplain the balancing of primary and secondary forces in reciprocating engines. Derive the conditions for complete balancing of primary and secondary forces.20267mDynamics of MachineryPartial balancing is particularly important in: (i) Steam turbines (ii) Locomotives (iii) Electric motors (iv) Centrifugal pumps.20262mDynamics 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
PreviousFor 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.NextA single-degree damped vibrating system has mass 7.5 kg and makes 24 free oscillations in 14 seconds. The amplitude reduces to 0.25 of its initial value after five oscillations. Determine (i) spring stiffness, (ii) logarithmic decrement, and (iii) damping factor (system damping/critical damping).
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