Effect of polygon abrasion on wheel rail force and axle box acceleration

LIN Feng-tao1, WANG Rui-tao1,2
(1.Key Laboratory of Conveyance and Equipment, Ministry of Education, East China Jiaotong University,
Nanchang 330013, China; 2.Locomotive Car Research Institute, China Academy of
Railway Sciences Corporation Limited, Beijing 100081, China)

Abstract: Aiming at the problem of increase of wheel-rail interaction and abnormal damage between wheel and rail due to polygonal wheel wear of high-speed EMU, FE model of wheelsets was established and Lancos method was adopted to analyze the mode of wheelsets. A rigid-flexible coupling dynamic model of train considering wheelsets flexibility was established to analyze the dynamic responses of wheel polygon wear with different amplitudes and orders at different speed level. The simulation results indicate that as the amplitude of the wheel polygon wear increases, the wheelrail vertical force and the axle-box acceleration increases, and when the degree of polygon wear is within 18 and 23, the excitation frequency caused by the polygon wear will lead to resonance in the frequency range of 300 Hz～350 Hz, 500 Hz～550 Hz and 680 Hz～750 Hz, which is close to the flexiblewheelset system mode. As a result, the wheel-rail force and vibration acceleration amplitude increase significantly in above-mentioned range.
Key words: wheel ovalization; wheel polygon wear; wheel-rail system; rigid-flexible coupling;wheelsetmodal