Modeling energy and stress concentration in diesel engines with flexible crankshaft
Abstract
Diesel engines feature significant power but result in huge dynamics that is related to the flexibility of crankshaft. Such flexibility decreases the air mass flow rate, resulting in a higher rate of CO exhaust emission. Since the analytical modeling of such dynamics has not been done yet, the present paper investigates the strain energy-based aspects, frequency-related aspects and stress concentration in diesel engines with flexible crankshaft. The result shows that the most influential parameters onto the strain energy of flexible crankshafts are the mass moment of inertia and the distance between the crank and the bearing of crankshaft. The radial force is several times larger than the tangential force. The force due to cylinder's pressure is several times larger than the force due to inertia, which is in turn several times larger than the force due to eccentricity. The study remedies the stress concentration in crankshaft by identifying: (i) the location of the most critical section of stress concentration, (ii) the effect of the radius of the crankpin shoulder fillet on the maximum shearing stress and maximum bending stress that can be withstood by the crankpin. The study facilitates determining the value of the radius of the crankpin shoulder fillet that remedies the stress concentration in the most critical section in crankshaft. The paper formulates the stress concentration factor and provides the sensitivity analysis thereon. The proposed models enable better performance of diesel engines, prolonging their service life and improving air quality.
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