| With the gradual development of our country’s social economy,the transportation demand between cities and between different regions in big cities are also increasing,which makes the urban rail transit in China develop rapidly.The mid-low speed maglev train is one of the seven urban rail transit systems,which effectively complements the urban rail transit network system.As one of the important components of the mid-low speed maglev vehicle,it is necessary to study the structure reliability of the levitation bogie.This thesis mainly focuses on the new type of mid-low speed maglev vehicle’s levitation bogie developed by our school,and studies the strength test method of levitation bogie,it provides a basis for the structural reliability design of the levitation bogie of mid-low speed maglev vehicle,and provides some guidance for the indoor strength test of the levitation bogie.In this thesis,the structure and functions of the new type of mid-low speed maglev vehicle’s levitation bogie are firstly introduced,and the bearing conditions of the levitation bogie during the actual operation of the vehicle are analyzed,and the boundary conditions of the finite element model of the levitation bogie are determined.The finite element model of the levitation bogie under 5 key working conditions is built by finite element modeling software Hyper Mesh,and the finite element model is simulated by finite element analysis software Ansys.Then,based on the fourth strength theory,the static strength of the single side module of the levitation bogie is evaluated,and the results show that the maximum stress is 41.431 MPa,which appears at the installation seat of the anti-roll beam,and the maximum stress value of each component is less than the allowable stress of the respective materials;In addition,the results of the modal analysis show that the first-order mode of the single side module of the levitation bogie is 7.811 Hz.The structural reliability of the new type of mid-low speed maglev vehicle’s levitation bogie is verified by static strength and modal analysis.Secondly,according to the structural characteristics of the new type of mid-low speed maglev vehicle’s levitation bogie and the bearing position and restraint mode under various working conditions,the design theory of the levitation bogie strength test bench is studied to ensure that the virtual test bench can carry out static strength and fatigue strength tests reliably.The mechanical system of the levitation bogie strength test bench is mainly designed,and the3-D model of the test bench is established by using 3-D modeling software Solidworks.Meanwhile,the supporting equipment and tooling required by the test bench are studied respectively,and the overall design description of the test bed is formed.Then,the finite element model of the levitation bogie strength test bench ss established by the finite element method,the static strength and mode of the test bench under the maximum load condition are simulated and analyzed,the structural reliability of levitation bogie strength test bench is verified,and its first-order mode is 13.24 Hz,away from the test load frequency of actuator,which verifies the feasibility of the test loading.Then,the static strength test and fatigue strength test of the levitation bogie are designed according to the existing wheel-rail vehicle bogie strength test standard based on the bearing condition of the levitation bogie and the structure of the test bench.12 kinds of static strength test conditions and 17 kinds of fatigue strength test conditions are set up.According to the above test conditions,the test loads are calculated,the relevant load spectrum is obtained and the load action mechanism of the test process is analyzed.Finally,based on the finite element simulation results and the structural characteristics of the levitation bogie,the position of the measuring point patch is determined,and the evaluation method of static strength test and fatigue strength test is developed based on the standard. |
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