T/CI 048-2023 Intelligent Fault Diagnosis and Operation and Maintenance Management Technology and Guidelines for the Exterior of Subway Trains' Automation and Management Technology Application

Scope

Scope: This document provides guidelines on terms and definitions, typical failure modes analysis, performance indicators, data acquisition techniques, image preprocessing techniques, component positioning techniques, and intelligent detection techniques for exterior fault diagnosis and operation and maintenance management of metro trains, among other related content. This document is applicable to the full life cycle health detection and diagnosis research, design, and technical routes of exterior fault detection in metro trains, and can serve as a technical basis for the design and research of intelligent operation and maintenance of metro trains. Main technical content: Key components and their failure modes of metro train exteriors 4.3.1 Overview of key components and their failure modes of metro train exteriors According to the component failure modes faced by intelligent fault diagnosis and operation and maintenance of metro train key components, the failure types can be divided into conventional visual-based abnormal fault modes and wear-and-tear-based fault modes that require measurement to determine abnormalities. 4.3.2 Analysis of conventional failure modes Conventional typical failure types mainly include missing class (Missing Class), bulge class (Bulge Class), foreign object class (Foreign Class), loss class (Losses Class), and crack class (Crack Class). In intelligent maintenance, the coding format of each item is usually "failure type_item name_item number". The following will analyze and discuss them separately. Missing class failures are items that need to be considered during most train maintenance. Trains contain numerous small components such as plugs, bolts, and coordinating devices, which ensure the overall stability of large components and enable them to function properly. However, due to the frequent braking and operation in dark and humid environments, high-frequency vibration and component aging easily lead to component damage

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