Research On Strength And Modal Of Welded Frame For 160km/h Rapid Wagon Bogie

Currently, the Chinese freight transport is rapid developing along the heavy-haul and rapid speed directions. Various high performance new freight cars are needed imminently. Compared to heavy-haul transport, the rapid speed freight transport develops tardily. In order to adapt the development of Chinese railway transport, it is imperative under the situation to operate 160km/h rapid speed freight train as soon as possible.Researching and manufacturing the bogie of rapid speed wagon is one of the key technologies for the rapid speed freight train. It is indicated that welded frame bogie is the certain running gear technique mode for Chinese 160km/h-rapid speed freight car. As the installation base of rapid speed freight car body and other bogie components, welded frame is the key loaded and transfer force structures. Its structural strength directly influences the running security and reliability of the car in its life span. So aiming at strength problem of welded frame for rapid speed freight car bogie, the main research contents carried out in this paper are as follows:(1) The main structural characters and performance parameters of new 160km/h rapid speed freight car bogie were introduced. The forming structures of welded frame were analyzed detailedly. It is the base to determine the operation loads and load cases for welded frame, and build reasonable FE model(2) By comparing and analyzing the rolling stock design standards or codes used nowadays in home and overseas, and considering the dynamic performance, structural characters of rapid speed freight car bogie, it is recommended to use the UIC codes to assess the structural strength of welded frame. The act loads and load cases for welded frame were determined according to relative design codes.(3) Based on introducing the basic principle of FEM, the FE stress analysis model for welded frame is build according to its structural and loading characters. Then the static loading capability is checked through calculating the stress of welded frame under exceptional in-service load cases. The forth strength theory is used to assess the structural static strength of welded frame.(4) Based on simply introducing the relative theory of metal fatigue, the dynamic loading capability is checked through calculating the stress of welded frame under normal in-service load cases and especial in-service load cases. The fatigue strength of welded frame was assessed according to the method provided by UIC codes.(5) The inherent vibration performance of welded frame was researched using FEM. Its natural frequencies and corresponding modal shape were determined.