ISO 18431-3:2014 PDF

Name: ISO 18431-3:2014 — Mechanical vibration and shock — Signal processing — Part 3: Methods of time-frequency analysis
SKU: ISO 18431-3:2014
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Mechanical vibration and shock — Signal processing — Part 3: Methods of time-frequency analysis

Название (английский):

ISO 18431-3:2014

Mechanical vibration and shock — Signal processing — Part 3: Methods of time-frequency analysis

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 24 марта 2014 г.
Издание:: ISO IS 18431 edition 1 version 1
ICS:: 17.160

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Описание (английский):

ISO 18431-3:2014 specifies methods for the digital calculation of a time-frequency analysis of a given sampled measurement of a physical or engineering quantity, such as acceleration, force, or displacement, over an interval of time. Several mathematical formulations of time-frequency transformations are given with requirements for recording of parameters and recommendations.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 18431-3:2014 - Mechanical vibration and shock - Signal processing - Part 3: Methods of time‑frequency analysis - specifies digital methods for calculating time‑frequency (and time‑scale) representations from sampled measurements of physical or engineering quantities (for example acceleration, force, displacement). The standard provides mathematical formulations of several time‑frequency transforms, specifies the measurement and processing parameters to record, and gives recommendations to enable quantitative, reproducible analysis of vibration and shock data.

Keywords: ISO 18431-3:2014, time-frequency analysis, mechanical vibration, signal processing, Wigner-Ville, short-time Fourier transform, wavelet transform, Choi-Williams

Key topics and technical requirements

Scope of data: Applies to both experimentally measured and numerically simulated sampled signals over a time interval (broad applicability from microscopic instruments to vehicles and buildings).

Time‑frequency transforms specified:

Short‑Time Fourier Transform (STFT) - requirements for window length K, window function w(k) and time increment Δn; units reported (e.g., u/Hz).
Wigner‑Ville distribution - quadratic time‑frequency method based on autocorrelation; notes on high resolution and potential spurious cross‑terms; sampling/time indexing considerations.
Generalized Wigner‑Ville / Choi‑Williams transform - filtered/autocorrelation forms and the dimensionless sigma parameter (σ) to reduce spurious components.
Wavelet transform (continuous) - definition, requirement to state the chosen mother wavelet (e.g., Gaussian‑enveloped sinusoid), and the inherent time/scale resolution trade‑offs.

Parameters and documentation: The standard requires recording of processing parameters (window type/length, Δt, Δn, transform-specific parameters such as σ or mother wavelet choice) and recommends how to report units and plots so results are quantitative and comparable.

Practical applications and users

Applications:

Condition monitoring and fault diagnosis (e.g., gearbox/gear tooth fault detection)
Analysis of impulsive events and shock responses (impact duration and frequency content)
Vibration analysis of variable‑speed machinery (engines, turbines) where spectral content changes with time or RPM
Structural vibration and civil/industrial testing

Who should use this standard:

Vibration and condition‑monitoring engineers
Test laboratories and OEM validation teams
Research scientists in signal processing and mechanical diagnostics
Software developers of vibration analysis and condition monitoring tools

Related standards

ISO 18431-1 - Signal processing: General introduction

ISO 18431-2 - Time domain windows for Fourier transform analysis

ISO 2041 - Mechanical vibration, shock and condition monitoring - Vocabulary

ISO 18431-3 provides the mathematical basis and practical parameter reporting that make time‑frequency methods reliable and interoperable across test labs, diagnostic systems and research, improving reproducibility and the quality of vibration and shock analysis.

ISO 18431-3:2014 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

ISO 18431-1:2005

Mechanical vibration and shock — Signal processing — Part 1: General introduction

ISO 18431-2:2004

Mechanical vibration and shock — Signal processing — Part 2: Time domain windows for Fourier Transform analys…

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