MODELLING RAIL THERMAL DIFFERENTIALS DUE TO BENDING AND DEFECTS

IF 1.3 4区工程技术 Q3 TRANSPORTATION SCIENCE & TECHNOLOGY

Transport Pub Date : 2021-06-10 DOI:10.3846/TRANSPORT.2021.14574

C. Bosomworth, M. Spiryagin, S. Alahakoon, C. Cole

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引用次数: 0

Abstract

Rail foot flaws have the potential to cause broken rails that can lead to derailment. This is not only an extremely costly issue for a rail operator in terms of damage to rolling stock, but has significant flow-on effects for network downtime and a safe working environment. In Australia, heavy haul operators run up to 42.5 t axle loads with trains in excess of 200 wagons and these long trains produce very large cyclic rail stresses. The early detection of foot flaws before a broken rail occurs is of high importance and there are currently no proven techniques for detecting rail foot flaws on trains at normal running speeds. This paper shall focus on the potential use of thermography as a detection technique and begin investigating the components of heat transfer in the rail to determine the viability of thermography for detecting rail foot flaws. The paper commences with an introduction to the sources of heat generation in the rail and modelling approaches for the effects of bending, natural environmental factors and transverse defects. It concludes with two theoretical case studies on heat generated due to these sources and discusses how they may inform the development of a practical thermography detection methodology.

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由于弯曲和缺陷造成的钢轨热差建模

轨道脚的缺陷有可能导致轨道断裂，从而导致脱轨。对于铁路运营商来说，这不仅是一个极其昂贵的问题，因为它会损坏机车车辆，而且会对网络停机时间和安全工作环境产生重大影响。在澳大利亚，重载运营商使用超过200节车厢的列车运行高达42.5吨的轴载，这些长列车产生非常大的循环轨道应力。在钢轨断裂发生之前及早发现轨脚缺陷是非常重要的，目前还没有成熟的技术来检测正常运行速度下的列车轨脚缺陷。本文将重点关注热成像作为一种检测技术的潜在用途，并开始研究钢轨中传热的组成部分，以确定热成像检测钢轨足部缺陷的可行性。本文首先介绍了钢轨产生热量的来源以及弯曲、自然环境因素和横向缺陷影响的建模方法。它总结了两个理论案例研究产生的热量，由于这些来源，并讨论了他们如何告知实际热成像检测方法的发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Transport Engineering-Mechanical Engineering

CiteScore

3.40

自引率

5.90%

发文量

审稿时长

4 months

期刊介绍： At present, transport is one of the key branches playing a crucial role in the development of economy. Reliable and properly organized transport services are required for a professional performance of industry, construction and agriculture. The public mood and efficiency of work also largely depend on the valuable functions of a carefully chosen transport system. A steady increase in transportation is accompanied by growing demands for a higher quality of transport services and optimum efficiency of transport performance. Currently, joint efforts taken by the transport experts and governing institutions of the country are required to develop and enhance the performance of the national transport system conducting theoretical and empirical research. TRANSPORT is an international peer-reviewed journal covering main aspects of transport and providing a source of information for the engineer and the applied scientist. The journal TRANSPORT publishes articles in the fields of: transport policy; fundamentals of the transport system; technology for carrying passengers and freight using road, railway, inland waterways, sea and air transport; technology for multimodal transportation and logistics; loading technology; roads, railways; airports, ports, transport terminals; traffic safety and environment protection; design, manufacture and exploitation of motor vehicles; pipeline transport; transport energetics; fuels, lubricants and maintenance materials; teamwork of customs and transport; transport information technologies; transport economics and management; transport standards; transport educology and history, etc.