ASTM F1650-98(2005)
(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 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.
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 and health practices and determine the applicability of regulatory limitations prior to use.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F1650 − 98(Reapproved 2005)
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 outlier rejection standards that address this issue may be used
ontheindividualdatasetspriortoapplyingthispracticeandits
1.1 This practice covers the required procedures for exam-
procedures.
ining sequential control tire data for any variation due to
changing test conditions. Such variations may influence abso- 1.4 Although this practice applies to various types of tire
lute and also comparative performance of candidate tires, as traction testing (for example, dry, wet, snow, ice), the proce-
they are tested over any short or extended time period. The dures as given in this practice may be used for any repetitive
variations addressed in this practice are systematic or bias tire testing in an environment where test conditions are subject
variations and not random variations. See Appendix X1 for to change.
additional details.
1.5 This standard does not purport to address all of the
1.1.1 Two types of variation may occur: time or test
safety concerns, if any, associated with its use. It is the
sequence“trendvariations,”eitherlinearorcurvilinear,andthe
responsibility of the user of this standard to establish appro-
less common transient or abrupt shift variations. If any
priate safety and health practices and determine the applica-
observed variations are declared to be statistically significant,
bility of regulatory limitations prior to use.
thecalculationproceduresaregiventocorrectfortheinfluence
of these variations. This approach is addressed in Method A. 2. Referenced Documents
2
1.2 In some testing programs, a policy is adopted to correct 2.1 ASTM Standards:
allcandidatetractiontestdatavalueswithouttheapplicationof E501 Specification for Rib Tire for Pavement Skid-
astatisticalroutinetodetermineifasignificanttrendorshiftis Resistance Tests
observed. This option is part of this practice and is addressed E524Specification for Smooth Tire for Pavement Skid-
in Method B. Resistance Tests
E826Practice for Testing Homogeneity of a Metal Lot or
1.3 The issue of rejecting outlier data points or test values
Batch in Solid Form by Spark Atomic Emission Spec-
that might occur among a set of otherwise acceptable data
trometry
values obtained under identical test conditions in a short time
E1136Specification for P195/75R14 Radial Standard Refer-
period is not part of this practice. Specific test method or other
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 Nov. 1, 2005. Published January 2006. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1995. Last previous edition approved in 1998 as F1650–98. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/F1650-98R05. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F1650 − 98 (2005)
F538Terminology Relating to the Characteristics and Per- may occur. The procedures as described in this practice are
formance of Tires therefore needed to correct for these unavoidable testing
complications.
3. Terminology
5. Summary of Practice
3.1 Descriptions of Terms Specific to This Standard—
Descriptionsoftermsparticulartothispracticearelistedeither
5.1 This practice specifies certain test plans for testing
as principal terms or under principal terms as derived terms.
control tires. Testing begins with an initial test of the control
3.2 Discussion: tireortireset.Anumberofcandidatetiretractiontestsarethen
c
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.