|Table of Contents|

Review on influence of coupler and draft gear on safety of railway train collision(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2021年01期
Page:
233-249
Research Field:
   综述专刊
Publishing date:

Info

Title:
Review on influence of coupler and draft gear on safety of railway train collision
Author(s):
ZHU Tao ZHANG Jing-ke WU Qi-fan LYU Rui-juan WANG Xiao-rui XIAO Shou-ne DENG Yong-quan
(State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
Keywords:
vehicle engineering coupler and draft gear energy absorption system crash safety collision response modeling method
PACS:
U270.34
DOI:
10.19818/j.cnki.1671-1637.2021.01.011
Abstract:
The research methodologies and results of coupler and draft gear in the field of train collisions in last 20 years were reviewed from four specific aspects of coupler and draft gears in train: function and failure mechanisms, classifications and standards, theories and applications, and train collision responses. The strengths, weaknesses, and future problems to be solved of these four studies were summarized. The role of coupler and draft gear in train collisions, as well as its position in the overall design of vehicle system, was discussed from the perspective of kinematic theory of train collisions. The compositions of sub-components of coupler and draft gear were introduced based on the crashworthiness and strength standards of trains in European Union, the United States, Japan, and China.The evolution of the theoretical model of coupler and draft gear was analyzed from its application in train collision dynamics model and finite element model.Research trends and development goals of coupler and draft gear were described based on the current state of coupler and draft gear worldwide. Research results show that coupler and draft gear is one of the important components in the multistage energy-absorption systems of trains. It is necessary to establish different mechanical models for different types of coupler and draft gears to accurately reflect the nonlinear hysteresis characteristics of the buffer, the energy absorption characteristics of the collapse pipe, and the dynamic characteristics of coupler and draft gear during collision. The coupler draft gear standards that currently exist in China and abroad only specify the static strength indices for coupler draft gears and only provide detailed specifications for freight-car coupler draft gears. The standardized load indicators and energy limits for the coupler and draft gear are scarce of high-speed trains in dynamic scenarios. Although elastomer and gas-liquid buffers have better mechanical collision properties than friction buffers, their complex nonlinear characteristics depend on accurate mathematical models and tests. At present, the transverse and vertical dynamic characteristics of the mathematical model of coupler and draft are yet to be formulated in details.Tests should be used to strengthen studies on the activation and failure stability of coupler and draft gears in train-operation and train-collision processes, as well as their effects on the longitudinal collision response of train cars.High stiffness levels in coupler and draft gear can lead to abnormal vertical and horizontal responses at low and medium speeds.The mechanical properties and initial attitudes of coupler and draft gears at different speed levels have great influence on vehicle collision mechanism. 2 tabs, 17 figs, 91 refs.

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Last Update: 2021-03-20