Modal Analysis of Rail Transit Gearbox

Modal analysis is an important method to study the dynamic properties of structures. In order to explore the effect of prestress on the dynamic characteristics of rail transit gearboxes, in this paper, a three-dimensional solid model of the rail transit gearbox was established, and the bearing reaction force of the transmission system was obtained by multi-body dynamics method. Considering the force transmitted by transmission system through the bearing seat to the case, the prestressed modal analysis of the rail transit gearbox casing was conducted by utilizing a finite element method, and the prestressed modal of the case was obtained. The modal parameters of the model were compared with the model of the case without prestress. The results manifested that the prestress has a significant on the modal characteristics of the gearbox casing, and the prestress of gearbox casing should be taken into account when conduct modal analysis.