Prediction of Piston Slap of IC Engine Using FEA by Varying Gas Pressure

Abstract

The automotive industries in recent years are growing with a faster rate with an emphasis on the development of quieter engines to minimize noise and vibration. Hence by improving performance, contribution can be done to minimize the noise pollution. In present work the study of engine part, viz. piston is considered as main source of vibration and noise due to slap. The motion of piston in cylinder from TDC to BDC is of two types, primary motion and secondary motion. The secondary motion gives the lateral motion of piston perpendicular to the axis of the motion of the piston. Hence, the lateral displacement of the piston is studied considering the different gas pressure on the piston for different crank angle position. The gas pressure curve is obtained from the actual engine performance data of Kirloskar make. In this work the finite element model of the piston is developed and structural analysis is done in ANSYS11 software. The stress and displacement curves are used to predict the presence of piston slap. The piston slap is considered as one of the chief sources of vibration during secondary motion.