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The paper presents the results of finite element study conducted by developing a three dimensional model of single cylinder engine piston assembly. A new method to estimate the piston assembly friction by finite element approach on the bases of IMEP (Indicated Mean Effective Pressure) without using any instrumentation and engine modification has been discussed. The basic CAD model of the engine cylinder required to build finite element model was developed using Ug-Nx-3 software. The finite element model of the single cylinder engine cylinder piston assembly was generated by using HYPERMESH 7 preprocessing software. The respective boundary conditions, loads, material properties, contact pairs were defined to mimic the real working conditions of the engine. In order to impose the effect of lubrication one dimensional Reynolds equation was solved to find hydrodynamic pressure acting on the piston skirt. The final model is solved by L.S.Dyna solver.

The paper presents results of the multibody non linear dynamic analysis of the internal combustion engine to study the motions of the piston assembly components like piston, piston rings etc. The complete three dimensional CAD model of the multicylinder engine is developed using UG-Nx-3 modeling software and the finite element model along with the required boundary conditions to mimic the working conditions of the engine is obtained using HYERMESH preprocessor. The effect of hydrodynamic lubrication is imposed by solving Reynolds equation. The complete model is simulated using L.S.Dyna software and the results of simulation are used to study the dynamic phenomenon of the piston assembly components. The dynamic motions of the top, second, oil rings are demonstrated and it is found that there exists a difference in ring motions in different cylinders of the same engine.