GB/T 33829-2017 PDF EnglishUS$155.00 · In stock · Download in 9 seconds
GB/T 33829-2017: Test method for snow grip performance of passenger car tyres 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 33829-2017: Test method for snow grip performance of passenger car tyres---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/GBT33829-2017NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.160.10 G 41 Test method for snow grip performance of passenger car tyres ISSUED ON: MAY 31, 2017 IMPLEMENTED ON: APRIL 01, 2018 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Test method ... 5 5 Test report ... 12 Appendix A (Normative) Snow hardness tester ... 13 Test method for snow grip performance of passenger car tyres1 ScopeThis Standard specifies the method for snow grip performance of passenger car tyres. To reduce the measurement deviation, this Standard uses a test method of comparison with standard tyres. This standard applies to passenger car tyres.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 6326, Tyre terms and definitions3 Terms and definitionsTerms and definitions determined by GB/T 6326 and the following ones are applicable to this document. 3.1 Candidate tyre The tyre that is measured through the test. 3.2 Standard reference test tyre; SRTT Standard reference test tyre A set of special candidate tyres that are used as a reference in the measurement system. To minimize the variation, these tyres which have tightly controlled design characteristics, are produced, controlled and stored according to relevant standards. 3.3 Control tyre The tyre that -- If the candidate tyre and the standard tyre cannot be directly compared on the same vehicle, THEN, compare the tyre with the candidate tyre, (CTI, see Appendix A) is 75 ~ 85. 4.2.2 Climatic conditions The ambient temperature range which is measured at about 1 m above the ground is -21°C ~ -7°C; The snow temperature which is measured at a depth of about 1 cm from the snowy road surface shall be -21°C ~ -9°C; The temperature variation during the test shall not exceed 10°C. During the test, large variation in direct sunlight and humidity shall be avoided; the wind speed should not exceed 5 m/s. 4.2.3 Test vehicle conditions 4.2.3.1 Select an ABS-equipped test vehicle to which both the candidate tyre and the standard tyre are applicable. 4.2.3.2 The test vehicle shall be equipped with a calibrated sensor suitable for winter measurements. The speed and distance data acquisition system shall be equipped with a function to store measurement results. The sensor and system accuracy shall meet the requirement that the relative uncertainty of the measured or calculated mean fully developed deceleration is less than 1%. 4.3 Test measurement instrument 4.3.1 Test measurement instruments shall be insensitive to vibration, deceleration and ambient temperature changes. All the exposed parts shall be able to withstand 100% relative humidity, dust, shock, vibration and other unfavorable factors. 4.3.2 The speed of the test vehicle shall be measured by a non-contact speed measurement instrument such as a five-wheeled instrument or a global positioning system (GPS). In the range of ambient temperature of -21°C ~ -7°C, the allowable error: a) Vehicle speed measurement: ± 1% or ± 0.5 km/h, whichever is larger; b) Distance measurement: ± 0.1 m. 4.3.3 During the test, the vehicle shall display the actual vehicle speed measured by measurement-instrument OR the difference BETWEEN the actual vehicle speed AND the standard vehicle speed, so that the driver can adjust the vehicle speed. 4.3.4 The accuracy of the barometer shall be ± 5 kPa. 4.6.7 Calculation of snow grip index of the candidate tyre: Calculate the snow grip index SG, which indicates the ratio of braking performance of the candidate tyre to the standard tyre on the snowy road, according to Formula (9): A -- average of the average-deceleration of the candidate tyre, in meters per square second (m/s2); WA -- weighted-average of the average-deceleration of the standard tyre, in meters per square second (m/s2). 4.7 Adopt control tyre to test the snow performance 4.7.1 Overview If the candidate tyre and the standard tyre differ greatly on specifications, and cannot be directly compared on the same vehicle, then, use candidate tyres to perform comparison test respectively. 4.7.2 Principle Use control tyres and two different test vehicles to perform comparison tests with the candidate tyres respectively. One of the test vehicles is suitable for the assembly of the standard tyre and the control tyre; the other is suitable for the assembly of the candidate tyre and the control tyre. The former is used to measure the standard tyre and the control tyre, and the latter is used to measure the candidate tyre and the control tyre. The two vehicles shall be tested on the same road surface; the surface temperature difference between the two tests shall be within 5°C. Two test vehicles shall use the same set of four control tyres which shall be mounted on the same position. The environmental conditions shall be comparable; all tests shall be completed within the same day. Calculate the snow grip index SG of the candidate tyre relative to the standard tyre according to Formula (10): Where: SG1 -- relative index of the control tyre and the standard tyre;Appendix A(Normative) Snow hardness tester A.1 Conditions of use A.1.1 Snow compression and shear strength have a great influence on the tyre traction performance. These parameters cannot be ignored. However, changes of these two aspects can be quantified by vertical and horizontal compaction tests. CTI snow hardness tester can measure and characterize snow surface compaction. A.1.2 The top of CTI snow hardness tester is a 1.6-mm-radius ball that looks like a plumb (see Figure A.1), and the other end is a measuring rod. Including the knurled nut at the measuring top, the entire instrument, in the laboratory, shall be adjusted to a weight of 220 g ± 1g; the height of the measuring rod shall be adjusted to 218.9 mm ± 0.25 mm. A.1.3 When using, the ball and the measuring rod are freely dropped at a predetermined height from the rail with the flange end to the tested surface, and the kinetic energy is converted into vertical insertion and horizontal compression. The insertion distance is directly represented by the number (50 ~ 100) from the handheld-scale. A.1.4 In order to ensure the consistency of the entire test-site, the range of values which is measured from different areas of the test-site shall not exceed 8. A.2 Instructions for use A.2.1 When the CTI snow hardness tester is used on site, the instrument shall be placed on the snow surface to ensure that the metal part of the instrument has the same temperature as the snow surface. After each measurement, the head of the measuring rod shall be wiped clean to ensure that no extra snowflakes are inside the instrument. If other factors cause snowflakes inside the instrument, the best way is melting the snowflakes instead of disassembling the instrument. If the instrument needs to be disassembled, be sure to remember clearly the location of all parts before disassembly. A.2.2 The standard test method is as follows: drive the vehicle with normal tyres on the front wheels over the test-site; then move the vehicle to expose the previous tyre pressing-mark; place the instrument in the center of the tyre pressing-mark; lift up the measuring rod; gently turn the instrument for 45° and ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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