Research On Vibration Response Of Key Parts Of Railway Special Container

With the rapid development of railway container transportation,the use and demand for railway special containers are also rapidly increasing.However,the current research on the fatigue reliability of special container structures in the railway transportation environment is still in a blank state.In order to ensure transportation safety,it is necessary to analyze the vibration characteristics and fatigue reliability of the key parts of the vibration response according to the railway transportation conditions.This thesis takes LNG tank container as the research object,uses railway freight car body fatigue and vehicle vibration test bench to carry out vibration test,combined with simulation analysis,carries out corresponding research on the vibration response of the key components of LNG tank container.The main research contents of this paper are as follows:(1)Research on the structure of LNG tank container,establish the finite element model of LNG tank container,determine the load type and application method according to actual operating conditions,perform finite element static simulation analysis on the LNG tank container,and obtain the fatigue key parts,and calculated the static stress response value and load-stress transfer coefficient of the key parts of the container under various load conditions;(2)Establish the dynamic model of LNG tank container,conduct dynamic simulation analysis of LNG tank container,obtain the load response at each bottom corner of the tank.Then study the load identification method,and obtain the load response of the tank,combined with the load-stress transfer coefficient,obtain the dynamic stress response of the key parts of the LNG tank container under various load conditions;(3)Determine the dynamic stress measurement points and acceleration measurement points of the LNG tank container,and use the railway freight car body fatigue and vehicle vibration test bench to perform the vehicle vibration test under the AAR5 spectrum excitation on the LNG tank container.Collect the response data of each measuring point at 60km/h,80km/h,100km/h,and 120km/h speed levels,and obtain dynamic stress response data and acceleration response data after data processing;(4)Perform finite element simulation modal analysis on the LNG tank container,and use the Poly MAX method to perform working modal analysis on the LNG tank container based on the measured acceleration response data,combined with the finite element simulation modal analysis results,determine the working modal parameters of the LNG tank container;(5)According to the simulated load response and the measured stress response,combined with the material S-N curve and Miner’s rule,the fatigue damage calculation of the key parts of the LNG tank container is carried out,and the key parts with larger fatigue damage are selected.Then calculate simulated load fatigue life and measured stress fatigue life,the basis for the fatigue life evaluation of key parts is determined after comparative analysis.The fatigue life of key parts is evaluated,and the dynamic stress response of key parts is analyzed by PSD spectrum.Combined with the results of modal analysis,the vibration characteristics of key parts are analyzed.58 figures,23 tables,81 references.