Dynamic responses of a high-speed railway car due to wheel polygonalisation

Experimental and Numerical Investigation into Formation of Metro Wheel Polygonalization

“…As it is shown in Figure 2, the wheel wear exhibits a combination of several different orders, while the wheel eccentricity (1 st order) and polygonal wear of the 6-8 th order have the highest roughness level. Such wheel polygonalization is unlike that previously observed on high-speed trains [14][15][16][17][18][19]24] and electric locomotives [12,13]; the latter are always characterized by a regular harmonic waveform with a constant wavelength along the wheel circumference. is is probably because high-speed trains and electric locomotives in China tend to maintain a constant operating speed over long-distance operation, while the metro's operational speed varies frequently due to the short station intervals.…”

“…Using a flexible wheelset model, Mazilu [22] found that wheel/rail contact forces increase when the passing frequency of the OOR interacts with the bending mode of the wheelset; similar results were obtained by Han [23]. Wu [16] investigated the dynamic response of a high-speed vehicle under 18 th order polygonal wear. e results suggested that high-order polygonalization leads to extreme acceleration on the axlebox and wheel/rail normal forces at high speeds and even wheel/rail separation at relatively low speeds when resonance occurs.…”

“…Further experimental investigation [13] suggested that wheelset first bending resonance may be the root cause of 18 th -19 th order polygonalization, while 24 th order polygonalization may be attributed to lateral bending resonance of the wheel disc. High-order wheel polygonal wear was observed on Chinese high-speed EMU train wheels; at operating speeds of 300 km/h, the wheel exhibited 18 th -20 th order polygonalization [14][15][16][17][18], while 23 rd -24 th order wheel polygonalization dominated under operating speeds of 250 km/h [19]. However, the passing frequency of a different polygonalization in Chinese high-speed trains displays almost the same interval (approximately 550-600 Hz).…”

“…e effect of wheel polygonalization on the dynamic response of the vehicle and track system has been widely investigated both theoretically and experimentally [16,17,[19][20][21][22][23]. Liu [20] reported that periodic polygonal wheels cause considerable dynamic loads in a wide speed range, while for stochastic polygonal wheels, rail/wheel contact forces become more sensitive at higher train speeds.…”

Experimental Investigations on the Effects of Fatigue Crack in Urban Metro Welded Bogie Frame

“…Similarly, by using on-site experiments and simulations, the mechanism of metro wheel polygonal wear was carefully explored at the speed of 65-75 km/h and suggested that the wheelset flexibility could accelerate the polygonal wear and abnormal vibration [19,20]. Such an irregular wheel profile was reasonably believed to produce a detrimental effect on the railway axle and bogie frame [21][22][23].…”