Investigations on rigid-flex coupling relationship based on FEM correction techniques
To avoid as much as possible the vibration fatigue problem of aluminum alloy carbody caused by the central hol-low tread wear of wheels,the rigid-flex coupling relationship of High Speed Rolling Stock is necessary to be established rea-sonably with the effective correction techniques of Finite Element Model.In view of German ICE3 prototype with primary hunting phenomenon,a dynamical design methodology of high-speed bogies was proposed,and the analysis graphs of full-vehicle stability properties and variation patterns were used to clarify the self-adaptive improvement direction,i.e.λeN≥λemin but λemin=(0.03-0.05).By applying the(semi-)active damping techniques between carbodies,the central hollow tread wear could be then self-cleaned through crossing over the dedicated lines of different speed-grades.Both rigid-flex cou-pling simulations and two tracking line tests of Trailer TC 02/07 had been obtained the consistent analysis conclusion on the formation mechanism of carbody fluttering phenomena,i.e.the traction converter hanged under floor produces the lateral coupling resonance with dominant frequency ca.9.2/9.3 Hz,which caused the serious fatigue damage to the transverse fil-let weld on roof,and then lost completely the technical space to promote the construction speed.However,the safety threshold of bogie vibration warning could be appropriately increased as long as the lateral modal frequency of traction con-verter was greater than 12 Hz,preferably close to 14 Hz.
万方数据
维普
