ASTM F1650-21
(Practice)Standard Practice for Evaluating Tire Traction Performance Data Under Varying Test Conditions
Standard Practice for Evaluating Tire Traction Performance Data Under Varying Test Conditions
ABSTRACT
This practice covers the required correction procedures for examining sequential control tire data for any systematic or bias (not random) variation due to changing test conditions that may influence absolute and also comparative performance of candidate tires, as they are tested over any short or extended time period. The procedures provided here may be used for any repetitive tire traction testing in any environment (for example, dry, wet, snow, ice) where test conditions are subject to change. This practice does not address the issue of rejecting outlier data points or test values that might occur among a set of otherwise acceptable data values obtained under identical test conditions in a short time period. Method A uses the initial operational conditions defined by the first control traction test as a reference point. The calculations correct all traction test performance parameters (for example, traction coefficients) to the initial level or condition of the pavement or other testing conditions, or both. With this method, corrections may be made after only a few candidate and control sets have been evaluated. Method B uses essentially the midpoint of any evaluation program, with the grand average traction test value as a reference point. This grand average value is obtained with higher precision than the initial control traction test average of Method A because it contains more values. However, Method B corrections cannot be made until the grand average value is established, which is normally at the end of any program.
SCOPE
1.1 This practice covers the required procedures for examining sequential control tire data for any variation due to changing test conditions. Such variations may influence absolute and also comparative performance of candidate tires, as they are tested over any short or extended time period. The variations addressed in this practice are systematic or bias variations and not random variations. See Appendix X1 for additional details.
1.1.1 Two types of variation may occur: time or test sequence “trend variations,” either linear or curvilinear, and the less common transient or abrupt shift variations. If any observed variations are declared to be statistically significant, the calculation procedures are given to correct for the influence of these variations. This approach is addressed in Method A.
1.2 In some testing programs, a policy is adopted to correct all candidate traction test data values without the application of a statistical routine to determine if a significant trend or shift is observed. This option is part of this practice and is addressed in Method B.
1.3 The issue of rejecting outlier data points or test values that might occur among a set of otherwise acceptable data values obtained under identical test conditions in a short time period is not part of this practice. Specific test method or other outlier rejection standards that address this issue may be used on the individual data sets prior to applying this practice and its procedures.
1.4 Although this practice applies to various types of tire traction testing (for example, dry, wet, snow, ice), the procedures as given in this practice may be used for any repetitive tire testing in an environment where test conditions are subject to change.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F1650 − 21
Standard Practice for
Evaluating Tire Traction Performance Data Under Varying
1
Test Conditions
This standard is issued under the fixed designation F1650; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Tiretractiontestingprogramsatprovinggroundsorotherexteriortestsitesareoftenextendedover
a period of days or weeks. During this time period test conditions may change due to a number of
varying factors, for example, temperature, rain or snow fall, surface texture, water depth, and wind
velocity and direction. If tire performance comparisons are to be made over any part of the test
program(ortheentireprogram)wherethesetestconditionvariationsareknownorsuspectedtoaffect
performance, the potential influence of these variations must be considered in any final evaluation of
traction performance.
1. Scope 1.4 Although this practice applies to various types of tire
traction testing (for example, dry, wet, snow, ice), the proce-
1.1 This practice covers the required procedures for exam-
dures as given in this practice may be used for any repetitive
ining sequential control tire data for any variation due to
tire testing in an environment where test conditions are subject
changing test conditions. Such variations may influence abso-
to change.
lute and also comparative performance of candidate tires, as
1.5 This standard does not purport to address all of the
they are tested over any short or extended time period. The
variations addressed in this practice are systematic or bias safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
variations and not random variations. See Appendix X1 for
additional details. priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.1.1 Two types of variation may occur: time or test
sequence“trendvariations,”eitherlinearorcurvilinear,andthe 1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
less common transient or abrupt shift variations. If any
observed variations are declared to be statistically significant, ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
thecalculationproceduresaregiventocorrectfortheinfluence
of these variations. This approach is addressed in Method A. mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.2 In some testing programs, a policy is adopted to correct
allcandidatetractiontestdatavalueswithouttheapplicationof
2. Referenced Documents
astatisticalroutinetodetermineifasignificanttrendorshiftis
2
2.1 ASTM Standards:
observed. This option is part of this practice and is addressed
E501Specification for Standard Rib Tire for Pavement
in Method B.
Skid-Resistance Tests
1.3 The issue of rejecting outlier data points or test values
E524Specification for Standard Smooth Tire for Pavement
that might occur among a set of otherwise acceptable data
Skid-Resistance Tests
values obtained under identical test conditions in a short time
E826Practice for Testing Homogeneity of a Metal Lot or
period is not part of this practice. Specific test method or other
Batch in Solid Form by Spark Atomic Emission Spec-
outlier rejection standards that address this issue may be used
trometry
ontheindividualdatasetspriortoapplyingthispracticeandits
E1136Specification for P195/75R14 Radial Standard Refer-
procedures.
ence Test Tire
1
This practice is under the jurisdiction ofASTM Committee F09 on Tires and is
2
the direct responsibility of Subcommittee F09.20 on Vehicular Testing. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2021. Published April 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ε1
approved in 1995. Last previous edition approved in 2014 as F1650–98 (2014) . Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/F1650-21. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F1650 − 21
F538Terminology Relating to the Characteristics and Per- 4. Significance and Use
formance of Tires
4.1 Tire testing is
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: F1650 − 98 (Reapproved 2014) F1650 − 21
Standard Practice for
Evaluating Tire Traction Performance Data Under Varying
1
Test Conditions
This standard is issued under the fixed designation F1650; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Editorially corrected Subsection X2.4 in April 2014.
INTRODUCTION
Tire traction testing programs at proving grounds or other exterior test sites are often extended over
a period of days or weeks. During this time period test conditions may change due to a number of
varying factors, for example, temperature, rain or snow fall, surface texture, water depth, and wind
velocity and direction. If tire performance comparisons are to be made over any part of the test
program (or the entire program) where these test condition variations are known or suspected to affect
performance, the potential influence of these variations must be considered in any final evaluation of
traction performance.
1. Scope
1.1 This practice covers the required procedures for examining sequential control tire data for any variation due to changing test
conditions. Such variations may influence absolute and also comparative performance of candidate tires, as they are tested over
any short or extended time period. The variations addressed in this practice are systematic or bias variations and not random
variations. See Appendix X1 for additional details.
1.1.1 Two types of variation may occur: time or test sequence “trend variations,” either linear or curvilinear, and the less common
transient or abrupt shift variations. If any observed variations are declared to be statistically significant, the calculation procedures
are given to correct for the influence of these variations. This approach is addressed in Method A.
1.2 In some testing programs, a policy is adopted to correct all candidate traction test data values without the application of a
statistical routine to determine if a significant trend or shift is observed. This option is part of this practice and is addressed in
Method B.
1.3 The issue of rejecting outlier data points or test values that might occur among a set of otherwise acceptable data values
obtained under identical test conditions in a short time period is not part of this practice. Specific test method or other outlier
rejection standards that address this issue may be used on the individual data sets prior to applying this practice and its procedures.
1.4 Although this practice applies to various types of tire traction testing (for example, dry, wet, snow, ice), the procedures as given
in this practice may be used for any repetitive tire testing in an environment where test conditions are subject to change.
1
This practice is under the jurisdiction of ASTM Committee F09 on Tires and is the direct responsibility of Subcommittee F09.20 on Vehicular Testing.
Current edition approved Jan. 1, 2014April 1, 2021. Published February 2014April 2021. Originally approved in 1995. Last previous edition approved in 20052014 as
ε1
F1650 – 98 (2005).(2014) . DOI: 10.1520/F1650-98R14E01.10.1520/F1650-21.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F1650 − 21
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
E501 Specification for Standard Rib Tire for Pavement Skid-Resistance Tests
E524 Specification for Standard Smooth Tire for Pavement Skid-Resistance Tests
E826 Practice for Testing Homogeneity of a Metal Lot or Batch in Solid Form by Spark Atomic Emission Spectrometry
E1136 Specification for P195/75R14 Radial Standard Reference Test Tire
F538 Te
...
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