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GB/T 29040-2012: Test methods of rolling resistance for motor vehicle tyres -- Single point test and correlation of measurement results Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 29040-2012: Test methods of rolling resistance for motor vehicle tyres -- Single point test and correlation of measurement results---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/GBT29040-2012 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.160.10 G 41 Test Methods of Rolling Resistance for Motor Vehicle Tyres - Single Point Test and Correlation of Measurement Results (ISO 28580.2009 Passenger Car, Truck and Bus Tyres - Methods of Measuring Rolling Resistance - Single Point Test and Correlation of Measurement Results, MOD) Issued on. DECEMBER 31, 2012 Implemented on. SEPTEMBER 1, 2013 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of ContentsForeword... 3 Introduction... 4 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 5 4 Test Methods... 8 5 Test Equipment... 9 6 Test Conditions... 10 7 Test Procedure... 11 8 Data Interpretation... 14 9 Data Analysis... 18 10 Measurement Machines Alignment and Monitoring Requirements... 19 Appendix A (Informative) Comparison of Chapter and Article Numbers between This Standard and ISO 28580.2009... 24 Appendix B (Informative) Technical Differences between This Standard and ISO 28580.2009 and Their Reasons... 26 Appendix C (Normative) Test Equipment Tolerances... 28 Appendix D (Informative) Measurement Methods of Moment of Inertia for Drum and Tyre Assembly (Deceleration Method)... 31 Bibliography... 36ForewordThis standard was drafted according to the rules specified in GB/T 1.1-2009. This Standard is modified in relation to ISO 28580.2009 "Passenger Car, Truck and Bus Tyres - Methods of Measuring Rolling Resistance - Single Point Test and Correlation of Measurement Results". There are some adjustments in the structure for this Standard which is compared with ISO 28580.2009; the comparison list of chapter and article numbers of this Standard and ISO 28580.2009 is given in Appendix A. There are some technical differences between ISO 28580.2009 and this Standard, those technical differences have already been incorporated into the text and marked with perpendicular single line on the margin of relevant clauses. Appendix B gives a summary list of these technical differences and their reasons for your reference. To be convenient for use, the following editorial changes are also made in this Standard. — Standard name was changed; — Bibliography was deleted. This national standard was proposed by China Petroleum and Chemical Industry Association. This Standard is under the jurisdiction of National Technical Committee 19 on Tyres and Rims of Standardization Administration of China (SAC/TC 19). Chief drafting organizations of this Standard. Beijing Research & Design Institute of Rubber Industry, Michelin (China) Investment Co., Ltd., Double Coin Holdings Ltd., Shandong Linglong Tyre Co., Ltd., Inspection and Quarantine Center of Shandong Exit & Entry Inspection and Quarantine Bureau, Triangle Tyre Co., Ltd., Sailun Co., Ltd., Hangzhou Zhongce Rubber Co., Ltd., Bridgestone (China) Investment Co., Ltd., Qingdao Gaoxiao Measurement & Control Technology Co., Ltd. and Sichuan Haida Rubber Group Co., Ltd. Chief drafting staff of this Standard. Li Hongwei, Xu Lihong, Lu Yi, Li Bowei, Chen Shaomei, Sheng Menglong, Qiao Lingling, Liu Aiqin, Zhang Jianjun, Fu Guangping, Qin Juncun, Yang Qi and Zheng Guangliang.1 ScopeThis Standard specifies methods for measuring rolling resistance, under controlled laboratory conditions, for new pneumatic tyres designed primarily for use on passenger cars, and trucks. This Standard is applicable to the new pneumatic tyres designed primarily for use on passenger cars, trucks and motorcycles. Tyres intended for temporary use only are not included in this Standard.2 Normative ReferencesThe following document is essential for the application of this Standard. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) is applicable to this document. GB/T 2977 Size Designation, Dimensions Inflation Pressure and Load Capacity for truck tyres3 Terms and DefinitionsFor the purpose of this Standard, the terms and definitions defined in GB/T 6326 apply. Type of parasitic loss measurement in which the tyre is kept rolling, without slippage, while reducing the tyre load to a level at which energy loss within the tyre itself is virtually zero. A virtual laboratory that is established on the base of test data of compare laboratory.4 Test MethodsThe four alternative measurement methods listed below are given in this national standard. The choice of an individual method is left to the tester. For each method, the test measurements shall be converted to a force acting at the tyre/drum interface. The four measured parameters are.5 Test EquipmentMeasurement of these parameters shall be sufficiently accurate and precise to provide the required test data. The specific and respective values are shown in Appendix C. The reference ambient temperature, measured at a distance 0.15 m ~ 1 m from the tyre sidewall, shall be 25 ℃. Care should be taken to ensure that the temperature of the test drum surface is the same as the ambient temperature at the beginning of the test.6 Test ConditionsThe value shall be obtained at the appropriate drum speed specified in Table 1. The inflation pressure shall be in accordance with that shown in Table 2 and shall be capped with the accuracy specified in Clause C.4.7 Test ProcedureThe steps described in 7.4 to 7.6 shall be carried out once if the measurement standard deviation, determined in accordance with 10.6.3, is.8 Data InterpretationThe parasitic losses, Fpl, expressed in newtons, are calculated by means of Equation (1). The parasitic losses, Fpl, expressed in newtons, are calculated by means of Equation (4). The rolling resistance, Fr, expressed in newtons, is calculated by means of Equation (6).9 Data AnalysisThe temperature scope shall be from 20 ℃ to 30 ℃. If measurements at temperatures other than 25 ℃ are unavoidable, then a correction for temperature shall be made by means of Equation (10), where Fr25 is the rolling resistance at 25 ℃, expressed in newtons. Where the number n of measurements is greater than 1, if required by 10.6, the measurement result shall be the average of the Cr values obtained for the n measurements, after the corrections described in 9.2 and 9.3 have been made.10 Measurement Machines Alignment and Monitoring RequirementsMeasured rolling resistance value shall be rounded to two decimal places after thermometric correction and drum diameter correction. All values shall be rounded off, except for the values of final correction equation. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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