Dynamic Analysis Of Internal Combustion Engine Block Considering Multiple Excitation Sources

The internal combustion engine as a power machinery commonly used in daily life and industrial production,brings great convenience to our daily life,with the continuous upgrading of technology,internal combustion engine gradually develop to high speed and high power direction,its dynamic response characteristics has become an important factor affecting combustion machine design;as the main body of the whole structure of the internal combustion engine,engine block has great influence to engine vibration and noise,so research the dynamic response of the organism is very important.Under this background,this paper takes the 6L265 diesel engine as the original machine,and applies the theory of finite element dynamics to analyze the dynamic response of the engine.First of all,according to the technical parameters of the diesel engine provided by the locomotive company to built three-dimensional modeling,and rational simplification of the body and parts,according to the finite element theory and ANSYS software to made modal analysis of the body structure,acquired the related inherent characteristics of internal combustion engine body.According to the dynamic theory,the virtual prototype model of the engine is established by using ADAMS software.using Hypermesh software to mesh the crankshaft and make it flexible.By setting reasonable constraints,calculating the incentive force which has great impact on engine block and analysis the force.Calculating engine block dynamic response under setting reasonable excitation force,and obtained the displacement nephogram of each cylinder.Finally,by using of post processing obtained engine block node displacement response and stress response then carry out frequency analysis for engine block node,acquired vibration displacement amplitude and main frequency of the vibration of the engine body,according to the results of the dynamic response of the body to reduce the vibration amplitude of the improved scheme is put forward,in order to improve the dynamic response of internal combustion engine.