GB/T 20921-2025 English PDF

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GB/T 20921-2025: Condition monitoring and diagnostics of machines - Vocabulary
Status: Valid

GB/T 20921: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 20921-2025	344	Add to Cart	4 days	Condition monitoring and diagnostics of machines - Vocabulary	Valid
GB/T 20921-2007	314	Add to Cart	3 days	Condition monitoring and diagnostics of machines -- Vocabulary	Valid

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Basic data

Standard ID: GB/T 20921-2025 (GB/T20921-2025)
Description (Translated English): Condition monitoring and diagnostics of machines - Vocabulary
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Classification of International Standard: 17.160
Word Count Estimation: 17,165
Date of Issue: 2025-06-30
Date of Implementation: 2026-01-01
Older Standard (superseded by this standard): GB/T 20921-2007
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 20921-2025: Condition monitoring and diagnostics of machines - Vocabulary

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20921-2025
ICS 17.160 CCSJ04 National Standard of the People's Republic of China Replaces GB/T 20921-2007 Machine Condition Monitoring and Diagnostics Glossary (ISO 13372.2012, IDT) Released on June 30, 2025 Implementation on January 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III 1 Scope 1 2 Normative references 1 3 General terms 1 4 Machine Features 3 5 Operation and Maintenance 3 6 Fault 3 7 Data Collection and Data Acquisition 4 8 Data Characteristics 5 9 Data Processing and Signal Processing 6 10 Analysis 6 11 Diagnosis 7 12 Predictions 7 References 8 Index 9 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 20921-2007 "Machine Condition Monitoring and Diagnosis Vocabulary". In addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Deleted the terms "analysis", "catastrophic failure", "predictive maintenance", "predictive maintenance" and their definitions (see 2.1,.2007 edition 2.3, 2.13, 2.15); --- Added the terms "criticality", "equipment", "machine health management", "machine health monitoring", "severity" and their definitions (see 3.4, 3.6, 3.13, 3.14, 3.16); --- Changed the definitions of the terms "condition monitoring", "function", "prediction" and "system" (see 3.3, 3.9, 3.15, 3.17,.2007 edition 2.5, 2.9, 2.16, 2.17); --- Added the rejection item of the term "condition-based maintenance" (see 3.2); --- Changed the definitions of the terms "critical machinery" and "performance" (see 4.1, 4.3, 3.1, 3.3 of the.2007 edition); --- Added the term "health and use monitoring system" and its definition (see 5.2), and deleted the term "friction and wear" and its definition (see 5.10 of the.2007 edition); --- Changed the definitions of the terms "failure mode" and "failure progression" (see 6.6, 6.7, 5.6, 5.7 of the.2007 edition); --- Changed the definitions of the terms "dynamic range", "thermal imaging" and "time window" (see 7.3, 7.4, 7.5, 6.3, 6.4,.2007 edition) 6.5) and deleted the term "signal-to-noise ratio" and its definition (see 7.6 of the.2007 edition); --- Changed the definitions of the terms "asynchronous" and "online" (see 8.1, 8.5, 7.1, 7.5 of the.2007 edition), and deleted the term "current analysis" and its definition (see 8.1 of the.2007 edition); --- Added the term "electrical characteristic analysis" and its definition (see 9.1), and deleted the terms "cost efficiency" and "cross-channel analysis" and their definitions. Meaning (see 9.1 and 9.3 of the.2007 edition); --- Changed the definitions of the terms "failure mode and effects analysis", "failure frequency" and "risk assessment" (see 10.2, 10.5, 10.8,.2007 9.4, 9.7, and 9.10 of the.2007 edition), and deleted the term “confidence level” and its definition (see 10.2 of the.2007 edition); --- Changed the definitions of the terms "diagnostic conclusion", "parameter" and "symptom" (see 11.2, 11.3, 11.4, and 10.3, 10.4, and 10.5 of the.2007 edition); --- Changed the definition of the term "forecast" (see 12.2, 11.2 of the.2007 edition). This document is equivalent to ISO 13372.2012 "Machine condition monitoring and diagnostics vocabulary". This document adds a chapter on “Normative References”. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Technical Committee for Standardization of Mechanical Vibration, Shock and Condition Monitoring (SAC/TC53). This document was drafted by. North China Electric Power University, China Machinery Engineering Corporation Zhengzhou Machinery Research Institute Co., Ltd., China Southern Power Grid Electric Power Technology Co., Ltd. Co., Ltd., Beijing Institute of Automation of the Mechanical Industry Co., Ltd., Huzhou Guanjiong Electromechanical Technology Co., Ltd., Sinopec Co., Ltd. Qilu Branch, China Shipbuilding Industry Corporation No. 704 Research Institute, Guangdong New Energy Storage National Research Institute Co., Ltd., The People's Liberation Army Armored Forces Academy, Shanghai Railway Institute Rail Transit Technology Co., Ltd., State Grid Hubei Electric Power Co., Ltd. Electric Power Science Research Institute Institute of Science and Technology, Beijing University of Science and Technology, Beijing Disheng Technology Co., Ltd., Guanglian Aviation Industry Co., Ltd., Huazhong University of Science and Technology, Henan Jiu Yuenpai Electric Power Technology Co., Ltd. The main drafters of this document are. Fu Zhongguang, Ma Weiping, Liu Shi, Zhu Xiaomin, Wu Hongbo, Dou Lisha, Deng Jian, Zhu Hua, Yang Yi, Feng Fuzhou, Luo Yanyun, Zhou Miao, Zhang Lijun, Ding Dongliang, Wang Zengduo, Liu Zhenqing, and Guo Yujie. This document was first published in.2007 and this is the first revision. Machine Condition Monitoring and Diagnostics Glossary 1 Scope This document defines the terms and definitions used in machine condition monitoring and diagnostics. It is intended to provide guidance to users and manufacturers of condition monitoring and diagnostic systems. Manufacturers provide a common vocabulary. This document applies to monitoring and diagnosis of machine conditions and provides unified terms and definitions. 2 Normative references This document has no normative references. 3 General terms 3.1 breakdown maintenance Repairs performed after a machine (3.10) has failed 3.2 Condition-based maintenance Maintenance performed under the supervision of a condition monitoring program. 3.3 Condition monitoring Method for collecting and processing information and data reflecting the state of a machine (3.10) over time NOTE If a fault (3.8) or failure (3.7) occurs, the state of the machine deteriorates. 3.4 Criticality A composite index combining the severity (3.16) of the impact with the expected frequency and probability of occurrence. 3.5 diagnosis evaluation of symptoms (11.4) and syndromes (6.9) to determine the nature (type, condition, extent) of a fault (3.8) or failure (3.7) investigation. 3.6 equipment A machine or group of machines including all machine or process control components. 3.7 failure loss of ability to perform a specified function (3.9) Note 1 to entry. A failure is an event distinct from a fault (3.8), which is a state. Note 2 to entry. Failure is a manifestation of a fault. ......

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