QC/T 1142-2021 PDF EnglishUS$140.00 · In stock · Download in 9 seconds
QC/T 1142-2021: Test method of natural frequency for automobile wheels Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
QC/T 1142-2021: Test method of natural frequency for automobile wheels---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/QCT1142-2021QC AUTOMOBILE INUDSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040.50 CCS T 22 Test Method of Natural Frequency for Automobile Wheels ISSUED ON: MARCH 05, 2021 IMPLEMENTED ON: JULY 01, 2021 Issued by: Ministry of Industry and Information Technology of PRC Table of ContentsForeword ... 5 1 Scope ... 6 2 Normative References ... 6 3 Terms and Definitions ... 6 4 Test Sample ... 6 5 Test Environment ... 7 6 Test Environment ... 7 7 Test Procedures ... 8 8 Data Processing ... 9 Test Method of Natural Frequency for Automobile Wheels1 ScopeThis 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 ReferencesThe 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 Marking3 Terms and DefinitionsFor 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 SampleThe test sample shall be a qualified new wheel completed through all the processing procedures.5 Test EnvironmentThere shall be no vibration and noise interference that affect the test in the test environment.6 Test Environment6.1 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. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of QC/T 1142-2021 be delivered?Answer: The full copy PDF of English version of QC/T 1142-2021 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of QC/T 1142-2021_English with my colleagues?Answer: Yes. 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