Abstract—The engine vibration is considered as the major source of engine noise which deteriorates the engine performance and increases the pollution. The noise from the engine comprises of mechanical and combustion noise. Combustion noise is primarily due to rapid pressure fluctuations in the combustion chamber. The mechanical noise is due to mechanical impact forces during both motions of piston viz. primary and secondary motions.In this study the effect of the piston secondary motion is taken for the analysis considering combustion pressure contributing to the dynamics of the piston. The Kirloskar Diesel Engine is considered for the present study. The geometrical modeling of the engine is done using CATIA V-5 modeling tool. The finite element meshing is done using Hypermesh 9.0 meshing tool. This work analysis is carried out in ANSYS 10 commercial finite element analysis software. To understand the complex behavior of the piston in motion relative to the other engine parts, viz., connecting rod, crankshaft, a Multi Body Dynamic (MBD) analysis is carried out. This analysis showed the occurrence of piston tilt near TDC and BDC. The stress and displacement results are viewed and analyzed using Hyperview. The analysis results can effectively be used to optimize piston geometry and hence lateral forces are minimized to obtain minimum tilt of the piston. The minimization of the piston tilt eventually leads to the reduction of engine noise.

Index Terms—Piston, Vibration, Finite element analysis, piston secondary motion, Hypermesh, Multibody dynamics

Cite: S N Kurbet, Vinay V Kuppast, and Vijaykumar N Chalwa, "," International Journal of Mechanical Engineering and Robotics Research, Vol.2, No. 1, pp. 183-192, January 2013.