| Crankshaft is one of the most important parts of diesel, and also is the part with the most complex force situation. The size parameters of the crankshaft affect the overall dimensions and weight of the diesel, and affect the performance and reliability of diesel to a large extent. With the continuous advancement and improvement of technology diesel, the working condition of crankshaft will become harsher. Therefore, the structure strength analysis of the crankshaft has an extremely important position at the process of the design and improvement of diesel.In this paper, as six-cylinder diesel crankshaft as the study object, the static performance and dynamic characteristics of the crankshaft was calculated and analyzed, which provide a feasibility scheme of the strength calculation at the process of the crankshaft design.The three-dimensional solid model of the crankshaft is established with ANSYS. After converting the finite element model, the crankshaft meshes and boundary conditions imposed are realized. The finite element method based on the crankshaft static strength analysis the crankshaft of the deformation and stress state, and the results show that the strength of the crankshaft design and operating condition meet the requirements of working conditions perfectly.Modal analysis were finished based on the above finite element model of crankshaft, the crankshaft before 10-order free vibration modal analysis of vibration mode shapes and natural frequencies were calculated. Modal frequency of the crankshaft can be used to predict the diesel components of the possibility of dynamic interference, so the rational structural design could avoid the resonance frequency. Optimize for the diesel crankshaft to improve the design based on valuable theoretical basis.The result is of the great significance for improving the design of the diesel crankshaft, improving the level of the diesel design engine performance, which is both economical and effective scientific means. |
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