Find the bore and stroke in inches of a six cylinder four stroke cycle gasoline engine which delivers 120 bhp at an average piston speed 2500 rpm. Assume volumetric efficiency 85%, mechanical efficiency 80%, HHV=20000 Btu/lb A/F= 15 lb /lb. excess air 30% brake thermal efficiency 23% stroke and bore ratio 1:1, pressure 14 psia and temperature 180 F at the end of suction stroke. FIND: A.) BORE B.) STOKE

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Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.