Research On Wheel Polygon Limit Of CRH3 Type EMU

With the continuous extension of China's high-speed railway network,high-speed rail has been integrated into people's daily travel life,and has made important contributions to China's rapid economic and social development,however,with the continuous operation of high-speed trains,the problem of wheel loss has become one of the important factors affecting the safe and stable operation of high-speed trains.Wheel polygon is one of the main forms of wheel loss,and the high frequency vibration caused by it has many adverse effects on the safe and stable operation of the train.This thesis takes the CRH3 technology platform EMU as the research object,and uses the finite element software ANASYS and the dynamics software SIMPACK to build the CRH3 EMU model considering the elastic wheel-set,and introduce the measured wheel polygon data and track irregularity disturbance on the Wuhan-Guangzhou line into the model to carry out the limit simulation of high-order polygons from 10 to 30 orders.Firstly,this thesis summarizes the wheel polygon faults of CRH3 EMUs and finds that the order of high-order wheel polygons is mostly in the order of 17~20,and the CRH3 of Guangzhou Railway Group has the highest polygon failure rate and the lowest in Northeast China.Then,this thesis is based on the analysis of the vibration data caused by the wheel polygon repair of CRH3 EMUs on the Wuhan-Guangzhou line,it finds that the polygonal wheel will cause obvious high-frequency vertical vibration of the axle box.However,the suspension of a series does not eliminate the vibration energy caused by the polygonal wheel,but the secondary suspension can eliminate a considerable amount of vibration energy.Second,this thesis is based on the measured polygons,this paper constructs 10~30-order polygon wheels.When the train speed is 300km/h,the 25 dB wheel polygon roughness limit,170 kN wheel rail vertical force limit and 100 g axle box vertical The wheel-rail vertical force and the vertical vibration of the axle box under the vibration limit condition are simulated and analyzed.It is found that the vertical force of the wheel-rail and the vertical vibration of the axlebox increase with the increase of the wheel polygon order,and 25 dB and When the wheel-rail vertical force and the vertical vibration of the axle box are less than 170 kN at 100 g,the specified 170 kN wheel-rail force limit is satisfied with the limits of 25 dB and 100g;Third,this thesis analyzes the train safety,stationarity and wheel wear index with the three limits of 25 dB,100g and 170 kN,it is found that the increase of the wheel polygon order has less influence on the derailment coefficient,the frame sagging vibration and the vehicle body stability,the wheel load shedding rate and the axle lateral force increase with the increase of the order,and the train operation safety and stability indicators under the three limit conditions are in line with China's current standard requirements.