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3.The connecting rod of an internal combustion engine is 225 mm long and has a mass 1.6 kg. The mass of the piston and gudgeon pin is 2.4 kg and the stroke is 150 mm. The cylinder bore is 112.5 mm. The centre of gravity of the connection rod is 150 mm from the small end. Its radius of gyration about the centre of gravity for oscillations in the plane of swing of the connecting rod is 87.5 mm. Determine the magnitude of torque on the crank when the piston is moving 25mm away from the top dead centre under an effective gas pressure of 1.8 MN/m2. The engine speed is 1200r.p.m.
Turning Moment DiagramTurning moment diagram for a single cylinder, double acting steam engine.where FP = Piston effort,r = Radius of crank,n = Ratio of the connecting rod length and radius of crank, andθ = Angle turned by the crank from inner dead centre.
Turning Moment Diagram for a Four Stroke Cycle InternalCombustion Engine
Turning Moment Diagram for a Multi-cylinder steam Engine
Fluctuation of Energy•The variations of energy above and below the mean resisting torque line are called fluctuations of energy.•The difference between the maximum and the minimum energies is known as maximum fluctuation of energy.