Research On Alloy Aluminum Axlebox Strength Of The Next Generation Subway

Axle box is the key components of train coupling wheelset and bogie frame,and it plays a vital role for the safe running of train.At the same time,the next generation of metro train aluminum alloy axle box is developed and designed independently in China.However,there are few reports published about the strength test and simulation method of axle box.This paper works on the rotary-arm aluminum alloy axle box of metro train,based on existing standards and the measured data to establish the axle box test criteria and load calculation.Combined with finite element simulation and bench test,the strength of aluminum alloy axle box of swivel arm is studied.The main research contents are as follows:(1)Comparing current international standards of architecture,according to its working condition and parameters of next generation metro trains,determining the text standard.Based on the vibration acceleration and load tracking test data of several subway lines.By comparing the data results of different lines with the standard load,it can be concluded that the axle box load calculated by the standard can cover the actual operational load,and the axle box test standard can be adopted,with sufficient margin and safer calculation method.(2)According to its working condition,the finite element models are discussed around the different complex boundary conditions,with reference to standard load,and a simplified equivalent simulation method is obtained.The single axle box model with bearing and rigid node is basically consistent with the test results,the model and calculation method greatly simplifies the calculation of the axle box.Based on standards,the static strength and fatigue strength of aluminum alloy axle box of the next generation subway train are calculated and analyzed by equivalent simplified simulation method,and the results show that the strength meets the requirements.(3)Comparing existing bench test schemes,from tooling simplicity,forces authenticity and reliability of the result.Combined with the existing bench test results and simulation technology,comparing and analysing the differences of the axle box stress distribution under different test ways.It is concluded that the side beam of bench test method,which data is more accurate and reliable.Exploring the credibility of adopting the rigid tooling instead of flexible tooling.The influence of elastic and rigid fixture on the accuracy and symmetry of test results was analyzed.(4)The static strength and fatigue strength tests of the axle box under the condition of supernormal load and operating load were carried out respectively.Based on the static strength test results,the stress distribution trend of the axle box as a whole,the symmetry of the positive load stress distribution,the consistency of the stress distribution of the left and right axle box and the difference of the stress distribution of the measuring points at different sections of the axle box are compared and analyzed.According to the test results,the strength of aluminum alloy axle box of the next generation metro train is evaluated,and its static strength and fatigue strength meet the requirements.On the basis of Miner linear cumulative damage theory,combined with the material S-N curve,calculatiing the damage value of points in the whole process test,it is concluded that the values of each measuring point damage under a 10 million-cycle are less than 1,the axle box body without defects such as cracks,meet the requirement of design and use.In this paper,a reliability evaluation method for aluminum alloy axle box of next generation metro train is established.It provides a strong support for the design and optimization of the rotary aluminum alloy axle box.It provides a reference for other axle box test and simulation methods and it provides ideas for the design and development of other structures.