QC/T 1142-2021Test method for natural frequency of automobile wheels (English PDF)
汽车车轮固有频率试验方法
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
March 5, 2021
Implementation date
July 1, 2021
Scope
QC/T 1142-2021 is the English-translated version of 汽车车轮固有频率试验方法.
QC/T 1142-2021 covers the test method for the natural frequency of automobile wheels under rigid constraints, and applies to passenger car wheels. It sets out terms and definitions, test samples, test environment, test equipment, test procedures and data processing.
Two quantities are defined: the disc's primary natural frequency, the primary frequency value at which the excitation point and the induction point are in opposite phase, a phase difference close to 180 degrees, and the rim's primary natural frequency, where they are in the same phase, a phase difference close to 0 degrees.
The sample must be a qualified new wheel completed through all processing procedures, and the test area must be free of vibration and noise interference affecting the test.
The equipment clause calls for a vibration measuring meter with a data acquisition system, a one-way acceleration sensor, an exciter such as a force hammer, and test software.
The data acquisition system needs at least 3 channels, a recommended measurement frequency range of 10 Hz to 5 kHz, and a sampling frequency of at least 10 kHz with anti-aliasing.
The recommended frequency response range of the sensor is 1 Hz to 10 kHz, its range is plus or minus 500 g and its sensitivity 10 mV/g. The typical bench uses an embedded fixed plate buried horizontally in a cement bench, recommended at 1000 mm by 1000 mm by 80 mm in steel. GB/T 2933 is the normative reference, for wheel and rim nomenclature.
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Document preview — QC/T 1142-2021
National Standard of the People's Republic of China
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword5
- 1 Scope6
- 2 Normative References6
- 3 Terms and Definitions6
- 4 Test Sample6
- 5 Test Environment7
- 6 Test Environment7
- 7 Test Procedures8
- 8 Data Processing9
1 Scope
This Document specifies the terms and definitions, test samples, test environment, test equipment, test procedures and data processing of test method of the natural frequency for automobile wheels under rigid constraints.
This Document is applicable to passenger car wheels.
2 Normative References
The provisions in following documents become the provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.
GB/T 2933 Wheels/Rims for Pneumatic Tyres - Nomenclature, Designation and Marking
3 Terms and Definitions
For the purposes of this Documents, the terms and definitions given in GB/T 2933 and the following apply.
3.1 Disc's primary natural frequency
The primary frequency value when the phase of the excitation point and the induction point are opposite (the phase difference is close to 180°).
3.2 Rim's primary natural frequency
The primary frequency value when the phase of the excitation point and the induction point are the same (the phase difference is close to 0°).
4 Test Sample
The test sample shall be a qualified new wheel completed through all the processing procedures.
5 Test Environment
There shall be no vibration and noise interference that affect the test in the test environment.
6 Test Environment
6.1 Measuring meter
6.1.1 The natural frequency test adopts a vibration measuring meter, which shall include a data acquisition system, a one-way acceleration sensor, an exciter (such as a force hammer) and test software.
6.1.2 The data acquisition system shall have at least 3 channels, the recommended measurement frequency range is 10Hz~5kHz; sampling frequency >= 10kHz, with anti-aliasing function.
6.1.3 The recommended frequency response range of the one-way acceleration sensor is 1 Hz~10kHz; the range is ±500g; and the sensitivity is 10mV/g.
6.2 Test bench
6.2.1 Figure 1 shows an example of a typical test bench, which is mainly composed of an embedded fixed plate, a fixed plate and a connecting plate. The test bench shall be fixed on the cement bench; and the embedded fixed plate shall be buried horizontally into the cement bench.
6.2.2 It is recommended length, width, and height of the embedded fixed plate is 1000mm×1000mm×80mm; and the material shall be steel.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.
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