| Power distribution cabinet is an important part of the current industrial production of electricity distribution.Among the high-speed trains,the performance of the distribution cabinet is a direct impact on the continuous and stable operation of the train,the cabinet treated as the mechanical skeleton of the power distribution cabinet is the basic of cabinet manufacturing,so the cabinet structure technology has become the basis of the foundation.Different types of distribution cabinets have various types of cabinet processing technology,which have their own characteristics,different requirements,in order to ultimately good use of performance in the cabinet manufacturing process,the requirements of the cabinet to meet the cabinet structure itself of the mechanical and mechanical performance requirements at the same time,but also to meet the various parts of the integrated functional conditions,appearance requirements.So the good performance of the distribution cabinet is the most basic indicators of stable work.This paper mainly conducted researchs on the following aspects:(1)With the design of a type of distribution cabinet as the research background,the structure of the general distribution cabinet and the processing technology of the cabinet were introduced in detail.According to the structure and performance requirements of a train power distribution,the structure of the distribution cabinet was designed by using CATIA with the theoretical analysis and the design and calculation of the main structural components.The cabinet is mainly composed of the shell skeleton and the internal support,which can realize the installation of the train distribution cabinet and the requirement of the structure performance.(2)Based on the establishment of the geometric model and finite element calculation model of the distribution cabinet,the static analysis of the cabinet structure was carried out by using the finite element simulation and analysis method,and the equivalent stress distribution and deformation of the cabinet structure under different working conditions were obtained,and the strength was checked.On the basis of static analysis,the modal analysis of the cabinet structure was carried out,and the vibration mode and natural frequency under different modes were calculated,and its anti vibration performance was studied.(3)According to the relevant regulations of the design of rivet in the manual of mechanical design,the rivet strength was checked for the two working conditions of the distribution cabinet with relatively large equivalent stress.The results showed that the safety factor of rivet strength was much higher than that of the assessment standard,and the connection was reliable.During the actual production process,the number of rivets could be reduced properly under the premise of meeting the strength and stability.(4)The durability limit method was used to check the fatigue of the distribution cabinet.According to the acceleration load of multiple directions when the distribution cabinet was running,the three directions of vibration and impact fatigue load were combined to form 8 kinds of fatigue conditions,and the simulation was carried out.The results showed that the maximum equivalent stress of the cabinet was lower than the fatigue limit strength 28.2MPa under 107 constant amplitude cyclic loads,which met the safety requirements of rail vehicle accessories.(5)The response surface optimization analysis method was used to optimize the thickness parameters of the distribution cabinet,and based on the DOE experimental design,the working condition 1 was selected for analysis.The results showed that the safety factor was still 1.23,the stress distribution was improved,and the lightweight design goal was realized in the distribution cabinet under the premise that the overall quality was reduced by 5.76 kg.Through the analysis and research on the performance of the cabinet,it provides a reliable mechanical basis for the structure design of the distribution cabinet,and makes thenormal and stable operation of the equipment more secure. |
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