| The cantilever structure plays a supporting role in the catenary system,and its service performance and state will directly affect the train operation.In recent years,Chinese workers have designed a new type of cantilever structure and gradually applied it to the catenary.However,the research on the performance analysis of the new type of cantilever structure is less;therefore,the research on the performance analysis of the new type of cantilever structure has important guiding significance for the design,production,installation and maintenance of the new type of cantilever.In this work,ANSYS WORKBENCH is used to analyze the static performance,dynamic performance and fatigue life of two kinds of aluminum alloy 6082 new positioning cantilever structures under various working conditions.The pantograph is simplified as a three lumped mass model and combined with the catenary finite element model.The load of the new cantilever structure under various working conditions is obtained by using the pantograph catenary coupling simulation analysis.The obtained load is applied to the study of the performance parameters of the new cantilever,and the structural performance of the new cantilever under load is obtained.The main work and conclusions are as follows:1?Through the research on the static performance of the aluminum alloy 6082 new type of cantilever structure,it is found that the new type of cantilever structure has good static performance,and the stress and deformation under various working conditions meet the requirements;the stress distribution and displacement distribution of the two types of positioning structure are similar,the maximum stress of the new type of cantilever structure is at the flat cantilever,and the maximum displacement is at the positioner.2?The modal analysis,harmonic response analysis and transient dynamic analysis are carried out to analyze the dynamic performance of the new cantilever structure under various conditions.The results of modal analysis show that the values of the two positioning modes of the new cantilever structure are close and have little influence under different working conditions.The harmonic response analysis results show that the frequency of the maximum displacement of the new cantilever structure in each direction of the bearing cable seat and the positioner end is much higher than the external frequency,avoiding the resonance phenomenon;the transient analysis results show that the maximum displacement value is much higher than the external frequency under different working conditions,thus avoiding the resonance phenomenon;the transient analysis results show that the maximum displacement value of the new cantilever structure is far higher than the external frequency Under the condition of large load,the new cantilever structure has a great displacement in the bearing cable seat and positioner,and has good transient performance.3?Through the fatigue strength analysis of the new cantilever structure,it is found that the new cantilever structure has good stress cycle times and strength coefficient under three speeds.Under the condition of the maximum load,the reliability of the flat cantilever,positioning column,positioner,stress cycle times less than 10~6 and strength coefficient less than 1 is slightly poor.In view of the phenomenon that the stress cycle of key components(flat cantilever,positioning column and positioner)is less and the strength coefficient is also low,it can be considered to increase the strength of the position to improve the overall life of the cantilever and maximize the utilization value of the whole cantilever. |
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