Simulation analysis of fatigue strength of heavy truck diesel engine crankshaft under long-distance driving

Wenbin Pan, Weigang Guo, Shuiqin Zhou
Fair friend institute of Intelligent manufacturing, Hangzhou Vocational & Technical College, Hangzhou, China, 310018

Abstract:

Crankshaft fatigue strength analysis is a necessary link for long-distance driving of heavy trucks. Due to the influence of the analysis model, the error of fatigue strength analysis results is large. Therefore, the fatigue strength simulation analysis of heavy truck diesel engine crankshaft under long-distance driving is proposed. Aiming at the working principle of diesel engine under the long-term driving environment of heavy truck, the crankshaft dynamics is deeply analyzed. The finite element analysis method is used as the basis of fatigue strength simulation analysis. In order to improve the authenticity of the simulation, the boundary condition loading method is designed before the finite element calculation. Combined with the dynamic differential equation under the finite element scheme and the calculation formula of applied load, the finite element fatigue strength analysis model is constructed. Finally, the simulation results of crankshaft fatigue strength are expressed by fatigue safety factor. The simulation results show that the calculation results of the minimum fatigue safety factor of the proposed method are closer to the real value. Compared with other analysis methods, the error of fatigue strength analysis results is reduced by 75% and 86%.