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GB/T 12538: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12538-2023 | English | 440 |
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Road vehicles - Determination of centre of gravity
| Valid |
| GB/T 12538-2003 | English | 70 |
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Road vehicles with two axles -- Determination of centre of gravity
| Obsolete |
| GB/T 12538-1990 | English | 279 |
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Motor vehicles. Height of gravity center. Measuring method
| Obsolete |
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GB/T 12538-2023: Road vehicles - Determination of centre of gravity
---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/GBT12538-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
CCS T 40
Replacing GB/T 12538-2003
Road Vehicles - Determination of Center of Gravity
(ISO 10392.2011, MOD)
Issued on. NOVEMBER 27, 2023
Implemented on. JUNE 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Measurement Preparation and Preliminary Measurement... 5
5 Determination of Horizontal Center of Gravity... 8
6 Determination of Height of Center of Gravity... 9
Appendix A (informative) Comparison Table of Structural No... 21
Appendix B (informative) Table of Technical Differences and Causes... 23
Appendix C (informative) Test Record of Axle lift Method... 25
Appendix D (informative) Test Record of Stable Pendulum Method... 28
Appendix E (informative) Test Record of Tilt-table Method... 31
Bibliography... 35
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement of GB/T 12538-2003 Road Vehicles with Two Axles -
Determination of Center of Gravity. In comparison with GB/T 12538-2003, apart from
structural adjustments and editorial modifications, the main technical changes are as follows.
a) The scope of application is modified (see Chapter 1; Chapter 1 of Version 2003);
b) Terms and definitions are added (see Chapter 3);
c) Measurement preparation and preliminary measurement are added (see Chapter 4);
d) The requirements for vehicle preparation are modified (see 4.2; Chapter 3 of Version
2003);
e) The accuracy requirements for the measuring instruments are modified (see 4.3;
Chapter 5 of Version 2003);
f) The definition of test data is modified to satisfy multi-axle requirements (see 4.4; 4.1
of Version 2003);
g) The calculation formula for the horizontal center of gravity is modified (see 5.1 and
5.2; 6.1 of Version 2003);
h) The principle of axle lift method is added (see 6.1.1);
i) The data processing method of the axle lift method is modified (see 6.1.2; 4.2 ~ 4.6
of Version 2003);
j) The calculation formula for the height of center of gravity of the axle lift method is
modified (see 6.1.3 and 6.1.4; 6.2 of Version 2003);
k) The test record of the axle lift method is modified (see 6.1.5; Chapter 7 of Version
2003);
l) The method of measuring the height of center of gravity using the stable pendulum
method is added (see 6.2);
m) The method of measuring the height of center of gravity using the tilt-table method is
added (see 6.3);
n) The special requirements for trailers are added (see 6.4).
This document modifies and adopts ISO 10392.2011 Road Vehicles - Determination of Center
of Gravity.
In comparison with ISO 10392.2011, there are many technical differences, and the involved
clauses are marked with a vertical single line () in the outer margin of the page. A table of these
technical differences and their causes is provided in Appendix B.
This document makes the following editorial modifications.
---Appendix E (informative) “Test Record of Tilt-table Method” is added.
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by Ministry of Industry and Information Technology of the
People’s Republic of China.
This document shall be under the jurisdiction of National Technical Committee 114 on Auto of
Standardization Administration of China (SAC/TC 114).
The drafting organizations of this document. China Automotive Technology and Research
Center Co., Ltd.; CATARC Automotive Inspection Center (Tianjin) Co., Ltd.; Guangxi Zhuang
Autonomous Region Automobile and Tractor Research Institute Co., Ltd.; CATARC
Automotive Inspection Center (Wuhan) Co., Ltd.; Xiangyang Da’an Automotive Inspection
Center Co., Ltd.; Yutong Bus Co., Ltd.; Jinan Yuantong Measurement and Control Technology
Co., Ltd.; SAIC MAXUS Automotive Co., Ltd.; Beijing Foton Daimler Automotive Co., Ltd.;
Chery Automobile Co., Ltd.; Dongfeng Liuzhou Motor Co., Ltd.; HONDA Motor Industrial
(China) Investment Co., Ltd.
The main drafters of this document. Yang Yunsheng, Tian Fugang, Chen Qian, He Ziyi, Wang
Zuguo, Xu Zhongtang, Gao Aidong, Chen Xiaopeng, Zhang Guangxiu, Liu Ce, Liang
Guanghui, Li Wenhai, Li Fengming, Wang Yulei, Liu Yaou, Qiu Ranran, Dai Mengjie, Zhou
Zhibin, Yang Yufei.
This document was firstly issued in 1990 and firstly revised in 2003.This is the second revision.
Road Vehicles - Determination of Center of Gravity
1 Scope
This document specifies a method for the determination of center of gravity of road vehicles
and describes a method for the determination of horizontal center of gravity and three methods
for the determination of the height of center of gravity.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 3730.1 Terms and Definitions of Motor Vehicles, Trailers and Combination Vehicle - Part
1.Types
GB/T 3730.3 Motor Vehicles and Towed Vehicles - Dimensions of Vehicles - Terms and
Definitions (GB/T 3730.3-1992, ISO 612.1978, NEQ)
3 Terms and Definitions
The terms and definitions defined in GB/T 3730.1, GB/T 3730.3 and GB/T 12549 are applicable
to this document.
4 Measurement Preparation and Preliminary Measurement
Adopt the vehicle coordinate system specified in GB/T 12549, that is, the positive x direction
points forward along the main movement direction of the vehicle, the positive y direction points
horizontally to the left, and the positive z direction points upward.
The longitudinal and vertical position of the seat shall be adjusted in accordance with the
vehicle manufacture’s requirements, and the seat back angle shall be adjusted (for seats with
corresponding adjustment functions).
5 Determination of Horizontal Center of Gravity
The horizontal distance between the vehicle’s center of gravity and the longitudinal center plane
is the horizontal position of center of gravity (yCG), expressed in (mm), which is calculated in
accordance with Formula (5).
6 Determination of Height of Center of Gravity
During the measurement, the loading load must be reliably fixed to avoid displacement caused
by vehicle lifting. In order to balance the impact of the block, both the lifting and descending
processes shall be measured.
Weigh the prepared vehicle and record its total mass (mv), then, the vehicle shall be restrained
on the platform in a mode that minimizes the movement of the chassis relative to the platform.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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