The influencing relationship of strong correlation can conditionally formulate between spin dissipation of wheels and strain energy of motor hanging frames.The previous achievements of self-adaptive improved de-sign make the wheel-rail matching return to the rational conditions.At the actual equivalent conicity of 0.10,the vibration early warning will only be triggered when the vehicle speed approaches 600 km/h.However,when the vehicle speed reaches or exceeds 500 km/h,the combined elastic hangers of the traction motors on bogie frames experience the resonance of down-swung motion mode,accompanied by torsional elastic modal vibration of the motor hanging frame.The investigating results for the cracking causes of the motor hanging frames gained thereby are consistent with the layered tearing conclusion of the metallographic analysis.This a-nalysis conclusion elucidates that the irrational condition of wheel-rail matching makes it difficult to avoid the detrimental wear of wheel-rail contact.Both will make the wheels generate the uncertain influences of spin dissipation,forcing the motor bogies to produce lateral forced vibration response,resulting in traction motors'intermittent or continuous chattering phenomena.This exposes the prototype design default of yaw redundancy constraint in the combined elastic hangers of traction motors on bogie frames and associated sensitive impacts on the weld fatigue damage of the motor hanging frames.
higher-speed motor bogiemotor hanging framerigid-flex coupling simulationfatigue damage assessmentredundancy constraint
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