Dynamic Stress Analysis and Structural Optimization of Braking Pipeline of Metro Vehicle

doi:10.3901/JME.2021.10.118

Abstract

Abstract: The braking pipeline on the bogie is a critical component of air braking system of the metro vehicles. Its reliability is crucial to the security of train brake. Aiming at the fracture phenomenon of the braking pipeline occurring on a metro line, the cause is analyzed by means of experimental and numerical modal analyses, vibration and dynamic stress tests. Three measures are presented to optimize the braking pipeline, including increasing pipeline wall thickness, using elastic pipe clamp and increasing the pipe clamp numbers. The dynamic stress of the braking pipeline for each optimization measure is obtained by a dynamic stress analysis method which considers frequency domain and time domain. The results show that the coupling resonance between the first-order lateral bending vibration of the braking pipeline (73.2 Hz) and the lateral bending vibration of the frame side beam (71.8 Hz) is the main reason for the braking pipeline fracture. Comparing with increasing the pipeline wall thickness from 1.5 mm to 3 mm and reducing the pipe clamp stiffness from 0.85 GPa to 0.15 GPa, adding an extra pipe clamp in middle position of the existing two pipe clamps on the braking pipeline has the most significant effect on reducing the pipeline dynamic stress amplitude. The present work provides a theoretical basis for the optimization design of the brake pipeline structure of vehicle bogie.

Key words: metro vehicles, pipeline fracture, random vibration, stress analysis, modal analysis, structural optimization

CLC Number:

U270

XIE Chenxi, TAO Gongquan, WEN Zefeng. Dynamic Stress Analysis and Structural Optimization of Braking Pipeline of Metro Vehicle[J]. Journal of Mechanical Engineering, 2021, 57(10): 118-125.

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