| The performance of crankshaft, the critical movement part of diesel engine of locomotive, influence directly the reliability and the life of diesel engine. Enduring periodical dynamic loads, the crankshaft system probably resonate intensively during the range of performance rotate speed. The resonance of crankshaft system may result in stress increasing rapidly, which will make the crankshaft flexual fatigue damage and torsional fatigue damage. Therefore, it is very important to precisely analyze the dynamical characteristics, proofread the strength and evaluate the life.The railway transportation develops for high-speed and over- loading, which request more rigorous design performance of diesel engine. Correspondently, the indexes of the crankshaft of the diesel engine are demanded rigidly. Nevertheless, the traditional research methods base commonly on simply model solution, or analyse the normal mode only. Few of them go deep into the fatigue analysis and life evaluation. That cannot satisfy the demand of the high speed locomotive.Firstly, the theories of normal mode analysis, dynamic response analysis, and fatigue evaluation are discussed in this paper. Subsequently, on the base of the theories, a technical approach is presented and studied by means of finite element method, from normal mode analysis of crankshaft, to dynamic response analysis , strength calculation and fatigue evaluation. This method solves many critical problems related to the modeling. With the dynamic stress , the result of dynamic response analysis, the crankshaft strength is calculated and life is evaluated, which is more accurate than the results calculated with the beam-elements model. Finally, The technologies are validated by the crankshaft of a 16-cylinder diesel engine of locomotive, and worthwhile results are acquired.As far as the crankshafts of locomotive diesel engine are concerned,the calculating method and the modeling technical approach are worthwhilein the engineering project. |
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