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Analysis of noise level from engines is important from point of view of customer satisfaction. Accurate prediction of noise is important for planning, design and target setting decisions for meeting customer satisfaction goals. In this work an analytic model has been described to break diesel engine noise data into various components in order to plan a strategy for condition monitoring of engine.

Analytical motion of piston secondary motion with an experimental verification for a diesel engine has been presented. Modeling of the piston secondary motion is carried out and simulation is performed. In this method, both dynamic characteristics of the part of piston skirt and cylinder liner are taken into consideration. As compared the simulated results with the experimental results, the validity of presented model has been confirmed and this numerical model is effective to comprehend the piston slap secondary motion.