Vibration test and structural optimization analysis of axle box bracket

Abstract

The bracket cracked and ground cable broken have occur to axle box many times on certain line metro vehicle. In view of this kind of accident, vibration test, vibration analysis, modal analysis as well as structure optimization are carried out for the axle box bracket of the subway. The test results show that the first transverse bending mode of the bracket is excited by the line vibration, so, it breaks due to vibration fatigue in the resonant state. The simulation results show that the modal frequency can be increased by thickening the bracket and optimizing its structure, so that avoiding resonance phenomenon and increasing its fatigue life. Finally, experiments are carried out to further verify the conclusion, and the structure that performs best can be chosen among multiple optimizations.

Dynamic analysis of lathe bed of woodworking CNC machining center based on the modeling of joint surface

“…According to the result of finite element analysis, the point in the upper right corner of the workbench is selected as the excitation point. Based on the test point, structure of the whole system is reflected as much as possible without missing the principle of the mode [ 27 ]. 63 measuring points are arranged on the body.…”