Analysis And Optimization Of A Certain Pedestal Of Locomotive Diesel Generator Set

With the increasing types of diesel generators, common pedestals are more ofen used in diesel generators set to isolate vibration. The static and dynamic properties of the pedestal have a significant impact on the reliability and stability of the diesel generators set. Therefore, before using the pedestal, to ensure the reliability of the diesel generators set, a comprehensive structural analysis for the pedestals is required.In this article, a three-dimensional model of one certain locomotive diesel generator set was established, and finite element analysis was made for the set through software ANSYS Workbench. During the static analysis, the static strength, vertical stiffness and torsional stiffness evaluation method of the pedestal was introduced. Through the results of finite element analysis, the strength and stiffness of the pedestal were checked. The stiffness and configuration of the vibration isolator were inspected if they meet the static design requirements. Meanwhile, according to the results of static analysis, the parts of which stiffness is relatively weak was discovered, and the starting point for improving the pedestal was found.In the dynamic analysis, this paper analyzed the possible excited force of the diesel generator, and then made a modal analysis on generator set. Through contrasting the natural frequency and the frequency of the excited force, the vibration isolation performance of the pedestal was tested.Finally, through the former static analysis, in order to improving the torsional stiffness of the pedestal,a structure optimization of the pedestal was made. The results of the computational analysis showed that:the optimized pedestal significantly improved the stress state and torsional rigidity, and optimized pedestal could meet the design requirements of vibration isolation. The optimization scheme for the pedestal was valid and feasible.