Analysis of Vibration in Diesel Engine Considering Combustion Gas Forces Using Grey Cast Iron Material

Abstract

In the today world, the diesel Engines are now replacing the petrol engines due to its fuel economy. Also they are mostly bei ng used as commercial vehicles. However diesel Engines generate comparatively higher NVH (Noise, Vibration and Harshness) levels. They are known to generate a lot of noise as a result of piston slap. In conventional diesel engines it is always found that piston slap occurs at near the top dead centre while at bottom dead centre and mid stroke slaps may be suppressed at some low speed operating conditions. Most of the researchers have found for the mechanical noise i.e. piston slap. Very few efforts are devoted for combustion gas force analysis. Little attention was paid on noise and vibration due to combustion gas force. This work focuses on this issue. The main purpose of this work is to analyze the vibration in diesel engine cylinder liner considering combustion gas forces and cylinder liner temperature using finite element software ANSYS. Also Grey cast iron material is being tested in the software for this purpose. The output results were quite satisfactory to predict the behavior of deflection under different pressures. The combustion gas forces calculate d for varying compression pressures. Results are presented the displacement vs frequency shows the amplitude of vibration. By comparing the analytical results, the validity of the proposed analysis has been confirmed. Furthermore, this analysis is applied to evaluate the vibration of grey cast iron material along with increase in thickness, and revealing the closer response accordi ng to the material and vibration.