ISO/TR 8955:2025 PDF

Name: ISO/TR 8955:2025 — Railway infrastructure — Track quality evaluation — Chord-based method
SKU: ISO/TR 8955:2025
Price: 25 EUR
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Railway infrastructure — Track quality evaluation — Chord-based method

Название (английский):

ISO/TR 8955:2025

Railway infrastructure — Track quality evaluation — Chord-based method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 43
Дата публикации:: 24 марта 2025 г.
Издание:: ISO TR 8955 edition 1 version 1
ICS:: 45.080

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Описание (английский):

This document describes the relationship between an inertial measurement system and a chord measurement system applying the chord-based method with different chord length and chord division. This document is applicable to 1 435 mm and wider track gauges. This document does not apply to urban/light rail systems, tramways and any track gauge narrower than 1 435 mm.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO/TR 8955:2025 - Railway infrastructure - Track quality evaluation - Chord-based method is a Technical Report that explains how chord-based measurement systems relate to inertial measurement systems for assessing railway track geometry. The document focuses on the conversion and signal-processing relationships when applying the chord-based method with different chord lengths and chord divisions. It is applicable to mainline track gauges of 1 435 mm and wider and explicitly excludes urban/light rail, tramways and gauges narrower than 1 435 mm. This TR is intended to be used in conjunction with ISO 23054-1.

Key technical topics and requirements

Measurement system relationship: Describes the two primary measuring systems - inertial measurement systems and chord measurement systems - and how they map to two evaluation approaches (wavelength range method and chord-based method).

Transfer functions: Defines the colouring, decolouring (Wiener inverse), and recolouring transfer functions linking measured signals to evaluation signals; includes treatment of impulse/transfer functions in Fourier, Laplace and Z domains.

Chord parameters: Discusses effects of chord length, chord division ratio, and normalized chord length on the transfer function and measurement outcome. Introduces chord length classes (short/long - C1/C2) used in practice.

Colouring and decolouring processes: Specifies methods to generate a chord measurement signal from non-coloured signals (colouring) and to remove chord-induced distortion (decolouring). Techniques covered include digital filtering (FIR and IIR), space-domain and frequency-domain methods.

Recolouring and verification: Presents methods to transform one coloured signal to another and verification approaches using test signals and recorded track geometry data.

Practical considerations: Includes procedures for eliminating influence of track geometry layout, use of restored waveforms, and examples (Annex A shows a colouring example in MATLAB; Annex B provides verification guidance).

Applications and target users

ISO/TR 8955:2025 is valuable for:

Track engineers and maintenance planners assessing longitudinal level and alignment.

Manufacturers of measurement systems (inertial and chord-based) for calibration and compatibility.

Data analysts and signal-processing engineers implementing colouring/decolouring and verification workflows.

Rail infrastructure owners and procurement teams specifying measurement performance and interoperability requirements.

Practical uses include converting measurement data between systems, defining processing chains for track quality evaluation, and ensuring consistent track geometry metrics for maintenance decision-making.

ISO/TR 8955:2025 PDF

Abstract

Похожие стандарты

Overview

Key technical topics and requirements

Applications and target users

Related standards

Технические детали

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