The Effect of Damping Factor of the Composite Bogie on Driving Performance

초록

The composite bogie frame functions not only sustain heavy static and dynamic loads but also have a primary suspension. Dynamic characteristic of the composite bogie frame was evaluated by means of modal test and the damping factor was estimated according to each eigen modes. The first bending eigen values of the composite bogie frame was 22.8Hz, corresponding to 27.7% of the steel frame. This result shows the possibility of the primary suspension by itself. However, the driving performance can be changed according to damping factor of the composite bogie frame. To verify the effect of damping factor from the composite bogie on driving performance, a multi-body dynamic analysis was performed. The bogie frame is modeled as a flexible body including the mode shapes and their frequencies. After completion of the multi-body dynamic analysis, the effect of damping factor from the modal test was studied.