Abstract
When a wheel rolls to a flat, it can generate the impact force several multiples larger than that generated at the common time. The paper established a wheel-rail coupling vibration model with wheel flat, and vibration acceleration responses of the rail was computed. The computational result was then compared with the experimental result. Good consistency between simulation and experiment indicated that the finite element model is reliable. Then, based on the finite element model and boundary element model, the paper established a structural-acoustic coupling boundary element model and computed the radiation noise of wheel-rail under effects of wheel flats. Results show that: the wheel flats were an important reason for wheel rail impact noises, impact noises of wheel flats were mainly concentrated in frequency bands of over 250 Hz, and impact noises of wheel flats were closely related with wheel flat length, quantity of wheel flats as well as running speeds. With the increase of these parameters, the radiation noise of wheel flats would be increased correspondingly.
Highlights
In recent years, the high-speed railway has obtained rapid development
Wheel flat is a general term for steel rail failures generated from periodical wheel clashing, that were caused by tread abrasion, stripping, defects and other factors which can influence wheel rolling roundness [1]
Yang [8] established a theoretical model of train-rail coupling vibration and computed impact noises caused by wheel flats, but the computational results were not verified by experiments
Summary
The high-speed railway has obtained rapid development. Because of application of advanced anti-skid and anti-idle technologies in high-speed trains, abrasion between wheels and steel rails has been reduced to a low level, but wheel abrasion still cannot be avoided. NUMERICAL COMPUTATION OF WHEEL-RAIL IMPACT NOISES WITH CONSIDERING WHEEL FLATS BASED ON THE BOUNDARY ELEMENT METHOD. Bian [6] used finite element method to research the impact force of sleeper under wheel flat effects and further analyzed influences brought by train speed and static loads on wheel flat impact force, but the research course was not verified in experiments. Yang [8] established a theoretical model of train-rail coupling vibration and computed impact noises caused by wheel flats, but the computational results were not verified by experiments. Based on the finite element model and boundary element model [11, 12], the structural-acoustic coupling model was built and the wheel-rail radiation noise under the impact of flats was computed
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