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GB/T 44125.2-2024: Railway applications - Calculation of braking performance(stopping, slowing and stationary braking) - Part 2: General algorithms utilizing step by step calculation
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Railway applications - Calculation of braking performance(stopping, slowing and stationary braking) - Part 2: General algorithms utilizing step by step calculation
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GB/T 44125.2-2024
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Basic data | Standard ID | GB/T 44125.2-2024 (GB/T44125.2-2024) | | Description (Translated English) | Railway applications - Calculation of braking performance(stopping, slowing and stationary braking) - Part 2: General algorithms utilizing step by step calculation | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | S30 | | Classification of International Standard | 45.060 | | Word Count Estimation | 30,321 | | Date of Issue | 2024-05-28 | | Date of Implementation | 2024-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 44125.2-2024: Railway applications - Calculation of braking performance(stopping, slowing and stationary braking) - Part 2: General algorithms utilizing step by step calculation
---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.
ICS 45:060
CCSS30
National Standards of People's Republic of China
Braking performance calculations for railway applications (stopping, deceleration and
Static braking) Part 2: Step-by-step calculation method
(ISO :20138-2:2019,MOD)
Released on 2024-05-28
2024-12-01 implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Symbols and units of measurement 1
5 General explanation of the step-by-step calculation 3
6 Notes on calculation of stopping/deceleration distance and deceleration 5
7 Static brake 7
Appendix A (Normative) Parking and deceleration braking calculation process 8
Appendix B (Informative) Calculation of deceleration force (non-static) 9
Appendix C (Informative) Braking Calculation Example 12
Reference 24
Foreword
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 is Part 2 of GB/T 44125 "Calculation of braking performance for railway applications (parking, deceleration and static braking)":
GB/T 44125 has published the following parts:
--- Part 1: Average calculation method;
--- Part 2: Step-by-step calculation method:
This document is modified to adopt ISO :20138-2:2019 "Calculation of braking performance for railway applications (parking, deceleration and static braking) Part 2
"Step-by-step calculation method":
This document has the following structural adjustments compared to ISO :20138-2:2019:
--- Changed the table in Appendix C: The original input data table is divided into train input data table and vehicle input data table, and the numbers are repeated in sequence:
New sorting (see Appendix C):
The technical differences between this document and ISO :20138-2:2019 and their reasons are as follows:
--- Replaced ISO :20138-1:2018 with the normative reference GB/T 44125:1 (see 5:1, 5:2, 5:3:4, 5:4:1, 6:3, 6:4:1,
6:5:4, 6:5:8, 6:6:2, Chapter 7), the consistency between the two documents is modified to adapt to my country's technical conditions, increase
Operability:
The following editorial changes were made to this document:
--- Deleted the terminology database description in ISO :20138-2:2019 (see Chapter 3);
--- Changed the variable a in Table 1 and formula (12) to ains (see Chapter 4, 5:4:2);
--- Changed the unit of ramp inclination angle (°) in Table C:3 to rad (see C:1:2):
--- Changed the pressure unit "bar" to "kPa" in Table C:2 of ISO :20138-2:2019 (see Table C:3):
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 Railway Administration:
This document was drafted by: China Academy of Railway Sciences Group Co:, Ltd: Locomotive and Rolling Stock Research Institute, China Academy of Railway Sciences Group Co:, Ltd:
CRRC Qingdao Sifang Rolling Stock Research Institute Co:, Ltd:, CRRC Tangshan Locomotive and Rolling Stock Co:, Ltd:, CRRC Changchun Railway Vehicles Co:, Ltd:
Datong Railway Vehicles Co:, Ltd:, CRRC Qingdao Sifang Locomotive and Rolling Stock Co:, Ltd:, CRRC Zhuzhou Electric Locomotive Co:, Ltd:, CRRC Qiqihar
EL VEHICLES LIMITED:
The main drafters of this document are: Jin Zhe, Jin Yuzhi, Song Rui, Cai Tian, Chen Meng, Shi Zhewen, Liu Zhonghua, Qiao Feng, Xu Li, Zhang Liguo, Li Dan,
Lu Zhengtao:
Introduction
The International Organization for Standardization Railway Application Technical Committee (ISO /TC269) has developed the braking performance calculation (parking, deceleration and static braking)
Standards for dynamics: average calculation method and step-by-step calculation method, used for calculation of braking distance, deceleration, power and energy of railway vehicles:
The calculation method of braking performance is in line with China's national conditions and in line with international standards: GB/T 44125 "Calculation of braking performance for railway applications (parking,
Deceleration and Static Braking)》, which is planned to consist of two parts:
--- Part 1: Average calculation method: The purpose is to use a general algorithm and formula with average value input to calculate all types of trains and
The stopping or deceleration distance of a single rolling stock and the corresponding braking power and energy for the corresponding braking distance:
--- Part 2: Step-by-step calculation method: The purpose is to use a general algorithm and formula with instantaneous value input to calculate all types of trains and
The stopping or deceleration distance of a single rolling stock and the corresponding braking power and energy for the corresponding braking distance:
Braking performance calculations for railway applications (stopping, deceleration and
Static braking) Part 2: Step-by-step calculation method
1 Scope
This document specifies the calculation of the braking system stopping/decelerating distance and the braking power and
A general algorithm for energy and other braking performance:
This document applies to the calculation of the braking forces generated by common types of braking systems:
This document is not applicable to the calculation of parking brake distances in conditions exceeding the available adhesion level (wheel slip):
Note 1: This document does not specify specific acceptance criteria such as pass/fail:
NOTE 2 This document is not intended as a design guide for the selection of braking systems, nor does it specify performance requirements for braking systems:
NOTE 3 If other types of braking systems are used, such as new equipment or new types of equipment, other methods of calculating braking force are used:
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document:
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document:
GB/T 44125:1 Calculation of braking performance for railway applications (parking, deceleration and static braking) Part 1: Average calculation method
(GB/T 44125:1-2024, ISO :20138-1:2018, MOD)
3 Terms and definitions
The following terms and definitions apply to this document:
3:1
Slowing distance slowing distance
The distance traveled from the initial braking request to the final speed vfin:
Note: When the final speed vfin=0m/s, the deceleration distance is also called the parking braking distance:
3:2
deceleration time slowingtime
The time elapsed from the initial braking request to the final speed vfin being reached:
Note: When the final speed vfin=0m/s, the deceleration time is also called parking brake time:
4 Symbols and units of measurement
The symbols and units of variables used in this document shall comply with the requirements of Table 1 and GB/T 44125:1:
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