GB/T 12538-2003 in English

《GB/T 12538-2003两轴道路车辆 重心位置的测定》由TC114（全国汽车标准化技术委员会）归口，TC114SC19（全国汽车标准化技术委员会整车分会）执行，主管部门为工业和信息化部。
本标准规定了两轴道路车辆重心位置测定的测试条件、测试方法、测试参数的精度，重心位置的确定及试验结果的记录与格式，适用于两轴道路车辆重心位置的测定。

1 Scope

This standard specifies test conditions, test methods, accuracy of test parameters, determination of centre of gravity, record and format of test results for determination of centre of gravity of road vehicles with two axles.
This standard is applicable to determination of centre of gravity for road vehicles with two axles, and determination of other vehicles may refer to it.

2 Normative References

The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending error in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the documents is applicable. For undated references, the latest edition of the normative document applies.
GB/T 12673 "Motor Vehicles-Basic Dimensions-Measuring Method"
GB/T 12674 "Motor Vehicles-Weight Parameter-Measuring Method"

3 Test Conditions

3.1 Liquid
Oil tank shall be filled up. In the test for height of centre of gravity, the vehicle inclination leads to liquid moving. The liquid influence shall be considered and counted in.
3.2 Load conditions, hanger bracket and machinery parts
After the specified load for vehicle is met (curb weight state if no special requirement specification), all loads shall be fixed on their positions to avoid vehicle displacement caused by declination. Vehicle hanger bracket shall be deadly locked to avoid the vehicle deformation state change caused by declination. Other spare parts flexibly mounted on vehicle shall all be deadly locked to avoid affecting test result.
When raising vehicle to test, put in neutral gear and loosen hand brake; for rolling of wheel, only adopt sprag or other methods to prevent the wheel from rolling. Maintain the front wheel in direct movement state as much as possible.

Foreword I
1 Scope
2 Normative Reference
3 Test Condition
4 Test Methods
5 Accuracy of Test Parameter
6 Determination of Centre of Gravity
7 Record Format
Appendix A (Normative) Determination of Wheel Static Radius rstat1
Appendix B (Normative) Test Report