Dynamic Finite Element Analysis And Optimized Design Of Aluminum Alloy Wheels

With the increasing number of cars and drivers,the safety of vehicles has become more and more important.Meanwhile,the current automobile exhaust emission regulations have also turned into rigorouser.so improving vehicle safety and reducing vehicle emissions have become hot issues.Compared with steel wheels,aluminum alloy wheels are widely used in automobiles due to their light weight and good heat dissipation.The wheel's weak position can be optimized through bending fatigue analysis,radial fatigue analysis,and random vibration analysis,it can improve their safety.Based on the finite element method,this paper analyzes the bending stress,radial stress and random vibration of the wheel using random vibration theory and filtered white noise method,and optimizes the wheel based on the results of the analysis.The main contents are:(1)This paper studies and analyzes how to transform the actual bending and radial test into the finite element simulation at home and abroad,and analyzes the use advantages of aluminum alloy wheels.(2)This article takes an aluminum alloy wheel as the subject investigated to construct its three-dimensional model.Through the analysis of the flex repeated experiment device and the radial repeated experiment device,the boundary conditions are obtained.According to the data provided by the manufacturer and measured,the loading bending moment and other required parameters in the test are calculated.(3)The bending,radial and modal analysis of the wheel is completed.Finally,the maximum stress data and get the dispersion of peril point.During the bending fatigue analysis,we get the biggest stress occurs when the maximum rated load rotates 262 degrees along the end of the loading shaft,which is 117.45 Mpa.The distribution of the maximum stress nodes is similar to the cosine curve fluctuation,In the process of radial fatigue analysis,it is found that the maximum stress of 112.79 Mpa is less than the permissible stress by analyzing the stress ofthe wheel.Although the node positions of dangerous points are scattered,they all appear near the center of the wheel.The trend is to move anticlockwise along the wheel,and the maximum radial force and the position of dangerous points appear When comparing the free mode and constrained mode of the wheel,the main modes of the two modes are approximately the same,and the maximum vibration value is concentrated on the outside of the wheel,but most of the swing directions of the two modes change.Under different constraint conditions,the frequency and the greatest shift of the wheel are constantly changing.In the simulation experiment of the mode,it is necessary to Boundary constraints should be set properly,and the resonance region should be avoided in practical work to reduce the acceleration damage of resonance to the wheel.(4)The kinematic model is established and solved.Based on this,the whole vehicle model is established.At the same time,the two-dimensional B-level random road surface is constructed based on the filter white noise method,and Adams is built based on MATLAB The3 D equivalent volume pavement recognizable by car,based on the three sigma principle,obtains the stress situation under the specific frequency spectrum,and observes the influence of the random vibration of the B-level pavement on the wheel.The conclusion is as follows:the damage of the random vibration to the wheel is much smaller than that of the bending and the radial damage to the wheel.The main ring breaking range is the wheel center,when it is carried out with other loading forces When coupling,the damage to the wheel can not be ignored.(5)By comparing the effects of bending,radial and random vibration on wheels,the maximum stress is taken as the optimization object.To determine the optimization parameters,two variables are designed in this paper,which are the bead seat width and the end value of the weight reduction groove.On the presuppose of economy and security,the best plan variables are obtained.After the model is built again,the bending stress of the optimized wheel reduce than the optimization,and the maximum equivalent bending stress reaches 117.45 Mpa when T= 5.6e-2s before the optimization,and 90.544 Mpa after the optimization,The overall stress is reduced by 22.9%;the three maximum meridional stress values before optimization are all reduced by different ranges,and the average value before optimization is 111.80 mpa,which is reduced to 87.84 mpa after optimization.