Wheel Out-of-Roundness Identification Approach Based on Axlebox High-Frequency Vibrations
In order to realise the real-time detection of wheel out-of-roundness(OOR)for high-speed trains,the spectral characteristics and mapping relationship between the axlebox high-frequency vibration and the wheel OOR are studied.The amplitude and order of the wheel OOR are identified using the frequency-domain integration method.Firstly,manifestations of the wheel polygonisation,rail corrugation and track modes of China high-speed railways are investigated through static measurements and laboratory experiments.Secondly,the time-frequency characteristics and evolution principle of the bogie axlebox vibrations are obtained through the long-term operation performance tracking test of a high-speed train.Finally,taking the 20th order wheel polygonisation as the research object,an identification approach of the wheel OOR order and amplitude is proposed based on the frequency-domain integration method.The results show that the third-order bending modal frequency of the China railway track system Ⅱ(CRTS-Ⅱ)track slab is 592 Hz.When the train is running at a speed of 300 km/h,the response frequencies due to the 20th-order wheel polygonisation and the rail corrugation with a wavelength of 136 mm are 580 and 613 Hz,respectively.The dominant frequencies of rail mode,wheel polygonisation and rail corrugation are relatively concentrated.The amplitude of high-frequency vibration of axlebox increases with the increase of vehicle speed and mileage after re-profiling.Theoretically,the amplitude and order of the wheel OOR can be identified by the integration of accelerations in the frequency domain.The relative error between the identified 20th-order wheel OOR results based on the field-tested axlebox acceleration and the static measured values is less than 5%.
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