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Conceptual paper | Open Access

Theory and practice for assessing structural integrity and dynamical integrity of high-speed trains

Weihua Zhang1( ), Yuanchen Zeng1, Dongli Song1, Zhiwei Wang1,2
State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu, China
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, China
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Abstract

Purpose

The safety and reliability of high-speed trains rely on the structural integrity of their components and the dynamic performance of the entire vehicle system. This paper aims to define and substantiate the assessment of the structural integrity and dynamical integrity of high-speed trains in both theory and practice. The key principles and approaches will be proposed, and their applications to high-speed trains in China will be presented.

Design/methodology/approach

First, the structural integrity and dynamical integrity of high-speed trains are defined, and their relationship is introduced. Then, the principles for assessing the structural integrity of structural and dynamical components are presented and practical examples of gearboxes and dampers are provided. Finally, the principles and approaches for assessing the dynamical integrity of high-speed trains are presented and a novel operational assessment method is further presented.

Findings

Vehicle system dynamics is the core of the proposed framework that provides the loads and vibrations on train components and the dynamic performance of the entire vehicle system. For assessing the structural integrity of structural components, an open-loop analysis considering both normal and abnormal vehicle conditions is needed. For assessing the structural integrity of dynamical components, a closed-loop analysis involving the influence of wear and degradation on vehicle system dynamics is needed. The analysis of vehicle system dynamics should follow the principles of complete objects, conditions and indices. Numerical, experimental and operational approaches should be combined to achieve effective assessments.

Originality/value

The practical applications demonstrate that assessing the structural integrity and dynamical integrity of high-speed trains can support better control of critical defects, better lifespan management of train components and better maintenance decision-making for high-speed trains.

Keywords

FatigueHigh-speed trainsStructural integrityDynamical integrityVehicle system dynamicsBogieIntegrity assessment

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Railway Sciences
Volume 3 Issue 2,
April 2024
Pages 113-127
DOI: 10.1108/RS-01-2024-0002
Cite this article:
Zhang W, Zeng Y, Song D, et al. Theory and practice for assessing structural integrity and dynamical integrity of high-speed trains. Railway Sciences, 2024, 3(2): 113-127. https://doi.org/10.1108/RS-01-2024-0002

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Received: 12 January 2024
Revised: 09 March 2024
Accepted: 11 March 2024
Published: 04 April 2024
© Weihua Zhang, Yuanchen Zeng, Dongli Song and Zhiwei Wang. Published in Railway Sciences.

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