GB/T 29716.3-2021 English PDF

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GB/T 29716.3-2021: Mechanical vibration and shock - Signal processing - Part 3: Methods of time-frequency analysis
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Basic data

Standard ID: GB/T 29716.3-2021 (GB/T29716.3-2021)
Description (Translated English): Mechanical vibration and shock - Signal processing - Part 3: Methods of time-frequency analysis
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Word Count Estimation: 10,120
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 29716.3-2021: Mechanical vibration and shock - Signal processing - Part 3: Methods of time-frequency analysis

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Mechanical vibration and shock-Signal processing-Part 3.Methods of time-frequency analysis ICS 17.160 J04 National Standards of People's Republic of China Mechanical vibration and shock signal processing Part 3.Time-frequency analysis method (ISO 18431-3.2014, IDT) Released on 2021-05-21 2021-12-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Symbol 2 5 Time-frequency transformation 2 5.1 Short-time Fourier Transform 2 5.2 Generalized Wigner-Wille distribution 3 5.3 Wavelet Transform 3 Appendix A (informative appendix) Gear failure analysis based on Wigner distribution 5 Reference 7

Foreword

GB/T 29716 "Mechanical Vibration and Shock Signal Processing" is divided into the following parts. ---Part 1.Introduction; ---Part 2.Time domain window of Fourier transform analysis; ---Part 3.Time-frequency analysis method; ---Part 4.Impact response spectrum analysis. This part is Part 3 of GB/T 29716. This section was drafted in accordance with the rules given in GB/T 1.1-2009. The translation method used in this part is equivalent to ISO 18431-3.2014 "Mechanical Vibration and Shock Signal Processing Part 3.Time-Frequency Analysis" method". The Chinese documents that correspond to the international documents cited in this section are as follows. ---GB/T 2298-2010 Mechanical vibration, shock and condition monitoring vocabulary (ISO 2041.2009, IDT) ---GB/T 29716.1-2013 Mechanical Vibration and Shock Signal Processing Part 1.Introduction (ISO 18431-1.2005, IDT) This part is proposed and managed by the National Mechanical Vibration, Shock and Condition Monitoring Standardization Technical Committee (SAC/TC53). Drafting organizations of this section. Shanghai Jiaotong University, China Southern Power Grid Power Technology Co., Ltd., Zhengzhou Machinery Research Institute Co., Ltd. The main drafters of this section. Rao Zhushi, Dong Guangming, Liu Shi, Ma Weiping, Yang Yi.

Introduction

Time-frequency analysis is suitable for the quantitative description of vibration or shock in the time domain and frequency domain. This method is conducive to the analysis of variable speed machinery Vibration problems, such as cars with changing engine speeds, etc. Time-frequency analysis is also suitable for quantitatively describing mechanical impulse response, such as collision response. Time-frequency analysis can describe the duration and frequency response of the impact. Frequency response can be expressed in terms of frequency, speed, or octave. Headquarters It contains four methods. short-time Fourier transform, Wigner-Will transform, Joey-Williams transform and wavelet transform. By choosing appropriately Taking characteristic parameters, each method can quantitatively describe the time and frequency components of shock and vibration, so as to realize the quantification of the specified machinery description. Mechanical vibration and shock signal processing Part 3.Time-frequency analysis method

1 Scope

This part of GB/T 29716 specifies the sampling measurement of a given physical or engineering quantity (such as acceleration, force or displacement) over a period of time Numerical calculation method for time-frequency analysis. Several mathematical formulas of time-frequency transformation are given, and requirements and suggestions are put forward for parameter recording. The data can be obtained through the experimental measurement of the mechanical structure, and can also be obtained from the numerical simulation of the mechanical structure. Due to the variety of mechanical structures Such as microscopic instruments, musical instruments, automobiles, processing machines, buildings and civil structures, etc., so the types of data involved are very wide. by These data can determine the response of a machine or human body to mechanical vibrations and shocks.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article For all undated reference documents, the latest version (including all amendments) is applicable to this document. ISO 2041 Mechanical vibration, shock and condition monitoring vocabulary (Mechanicalvibration, shockandconditionmonito- ring-Vocabulary) ISO 18431-1 Mechanical vibration and shock signal processing Part 1.Introduction (Mechanical vibration and shock- Signalprocessing-Part 1.Generalintroduction)

3 Terms and definitions

The following terms and definitions defined by ISO 2041 and ISO 18431-1 apply to this document. 3.1 Short-time Fourier transform A mathematical transformation related to Fourier transform, used to determine the dependence of harmonic frequency and phase on time in time-varying vibration. 3.2 Wigner-Vile distribution Bilinear time-frequency description based on autocorrelation of vibration signals. 3.3 Generalized Wigner-Vile distribution Time-frequency description based on autocorrelation of vibration signal with filtering processing. 3.4 Choi-Wiliams transform Generalized Wigner-Wille distribution of vibration signal with specific kernel function. 3.5 Wavelettransform Time-frequency description based on frequency scale transformation of vibration signal. ......

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