Basic Analytical Modeling of the Piston Slap in Conjunction With Engine Block Vibration

Abstract

Abstract The objective of this research is to enhance and develop analytical and experimental schemes to study the source and path analysis of piston slap noise and to develop tools to relate the piston slap to the engine block vibration. These computer tools solve the piston dynamics and the engine block vibration. The results of this approach are block vibrations that are comparable to experimental results. This study resulted in an analytical approach to understand the piston dynamics in conjunction with block vibration. The engine block vibration was obtained using both a coupled and uncoupled approach due to the piston slap. The coupled approach was to solve the piston motion along with the flexible motion of the cylinder bore which yields the cylinder block vibration directly. The uncoupled approach consists of solving for the contact forces with the simple cylinder model; then using those forces in an FEA analysis of the engine block to determine the resulting vibration.