Parametric Sensitivity Study on Modal Frequency Respect to Fatigue Damage of Bogie Frame

doi:10.3901/JME.2018.04.264

Abstract

Abstract: Bogie frame is the main loaded part on running gear. Fatigue strength and reliability of the frame structure are kernel objects in structural design. According to the loading analysis, vehicle body vibration loads and torsion supporting induced by track irregularities contribute mostly to the elastic deformations of the frame. Modal participant coefficients are analyzed by rigid-flexible coupling dynamic simulations based on modal flexibility method. The first modal vibration response is main contributor to the elastic deformation of the frame which also induce high stress levels and fatigue damages at connections of side and transverse beams. As H shape is common to bogie structural pattern, an abstract model of variant torsion stiffness is derived for parameter study on the relations of modal frequency and fatigue damage. Torsion frequency is variant from 0 Hz to 45 Hz by changing torsion spring stiffness and dynamic stresses and fatigue damages are simulated by quai-static superposition with inertia relief method. It is found that fatigue damages at connection locations are decreased with increased torsion frequency and the parameter sensitivity is larger than other areas. It is recommended that within the mass constraints, the torsion modal frequency should be increased for more smooth stiffness distributions.

Key words: bogie frame, fatigue damage, structural modal, variable torsion stiffness

CLC Number:

U260

LI Guodong, WANG Jianbin, ZENG Jing. Parametric Sensitivity Study on Modal Frequency Respect to Fatigue Damage of Bogie Frame[J]. Journal of Mechanical Engineering, 2018, 54(4): 264-269.

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