ASTM F811-02

Standard Practice for Accelerometer Use in Vehicles for Tire Testing

SIGNIFICANCE AND USE
The measured accelerometer output can be used to calculate traction properties of combined tire-vehicle systems for passenger cars, light trucks, and heavy trucks through use of applicable methods of testing.
This practice is intended to achieve uniformity in test vehicle accelerometer use and in accelerometer signal processing. Through such usage, a basis for meaningful comparisons of test results from different sources will be obtained.
This practice is not applicable to accelerometers used in destructive testing, such as vehicle crash tests or vehicle vibration measurements.
SCOPE
1.1 This practice covers guidelines for using accelerometers in test vehicles to evaluate dynamic accelerations resulting from various maneuvers such as braking, accelerating, or cornering.  
1.2 This practice is applicable to accelerometers that are rigidly attached to the body of the test vehicle or stabilized to the earth-fixed axis system by means of a gyroscope.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4 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. Specific precautions are given in Section 6.

General Information

• Status: Historical
• Publication Date: 09-Oct-2002
• ICS: 83.160.01 - Tyres in general
• Technical Committee: F09 - Tires
• Drafting Committee: F09.10 - Equipment, Facilities and Calibration

Relations

• Replaces: ASTM F811-01 - Standard Practice for Accelerometer Use in Vehicles for Tire Testing
• Effective Date: 10-Oct-2002
• Replaced By: ASTM F811-02(2010) - Standard Practice for Accelerometer Use in Vehicles for Tire Testing
• Effective Date: 01-Feb-2010
• Referred By: ASTM F1572-21 - Standard Test Methods for Tire Performance Testing on Snow and Ice Surfaces
• Effective Date: 10-Oct-2002

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:F811–02
Standard Practice for
1
Accelerometer Use in Vehicles for Tire Testing
ThisstandardisissuedunderthefixeddesignationF811;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.4 gyro-stabilized accelerometer, n—a precision vertical
gyroscope fitted with one to three accelerometers to provide
1.1 Thispracticecoversguidelinesforusingaccelerometers
orthogonal measurements referenced to the earth-fixed axis
in test vehicles to evaluate dynamic accelerations resulting
system. F538
from various maneuvers such as braking, accelerating, or
3.1.5 servo accelerometer, n—an accelerometer containing
cornering.
servo mechanisms, electronics, and a seismic element to sense
1.2 This practice is applicable to accelerometers that are
inertial reaction. F538
rigidly attached to the body of the test vehicle or stabilized to
3.1.6 strain gage accelerometer, n—an accelerometer using
the earth-fixed axis system by means of a gyroscope.
strain gages to sense the motion of the seismic element.
1.3 The values stated in SI units are to be regarded as the
F538
standard. The values given in parentheses are for information
3.2 Definitions of Terms Specific to This Standard:
only.
3.2.1 performance accelerometer, n—a packaged accelera-
1.4 This standard does not purport to address all of the
tionmeasuringsystemwithintegraldataprocessingcapability.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety and health practices and determine the applica-
4.1 The measured accelerometer output can be used to
bility of regulatory limitations prior to use. Specific precau-
calculate traction properties of combined tire-vehicle systems
tions are given in Section 6.
for passenger cars, light trucks, and heavy trucks through use
2. Referenced Documents of applicable methods of testing.
2
4.2 This practice is intended to achieve uniformity in test
2.1 ASTM Standards:
vehicleaccelerometeruseandinaccelerometersignalprocess-
F538 Terminology Relating to the Characteristics and Per-
ing. Through such usage, a basis for meaningful comparisons
formance of Tires
of test results from different sources will be obtained.
3. Terminology 4.3 This practice is not applicable to accelerometers used in
destructive testing, such as vehicle crash tests or vehicle
3.1 Definitions:
vibration measurements.
3.1.1 accelerometer, n—an instrument that senses inertial
reaction to measure linear or angular acceleration. F538
5. Apparatus
3.1.2 bandwidth, [1/T], n—the range of frequencies within
5.1 Body-Mounted Accelerometer—An accelerometer shall
whichcertainperformancecharacteristicsoccur;specificlimits
be used to measure vehicle accelerations in any of the three
normally apply. F538
primary vehicle axes (use x, y, z as illustrated in Fig. 1) and
3.1.3 g, n—a unit of acceleration where 1 g is equal to the
2 2
shall have the following specifications:
acceleration of gravity, 9.8 m/s (32.2 ft/s ). F538
5.1.1 Range—The full-scale range of the accelerometer
shallbeatleast 61.0gandnotmorethan 65.0gforunitsused
inthexandyaxes,andatleast 62.0gandnotmorethan 65.0
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ThispracticeisunderthejurisdictionofASTMCommitteeF09onTiresandis
g for units used in the z axis.
the direct responsibility of Subcommittee F09.10 on Equipment, Facilities, and
5.1.2 Accuracy—Amplitude accuracy shall be equal or
Calibration.
better than 61% of full scale including all error sources.
Current edition approved October 10, 2002. Published October 2002. Originally
published as F811–83. Last previous edition F811–01. DOI: 10.1520/F0811-02.
5.1.3 Bandwidth—The frequency response of the complete
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
system shall be from DC to a minimum of 20 Hz. The output
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
shall not vary more than 62% of the static output over this
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. frequency range.
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F811–02
FIG. 1 Sign Convention
5.1.4 Temperature—The operating temperature range shall vehicle calibration procedures suitable for test stability. The
be, as a minimum, between −23 and 66°C (−10 and 150°F) software for these units considers the roll rates for several
withatemperaturesensitivityoflessthan0.054%/°C(0.03%/
different vehicle suspension combinations and will adjust t
...