ASTM F811-01

Standard Practice for Accelerometer Use in Vehicles for Tire Testing

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-May-2001
• ICS: 83.160.01 - Tyres in general
• Technical Committee: F09 - Tires
• Drafting Committee: F09.10 - Equipment, Facilities and Calibration

Relations

• Replaces: ASTM F811-95 - Standard Practice for Accelerometer Use in Vehicles for Tire Testing
• Effective Date: 10-May-2001
• Replaced By: ASTM F811-02 - Standard Practice for Accelerometer Use in Vehicles for Tire Testing
• Effective Date: 10-Oct-2002
• Referred By: ASTM F1572-21 - Standard Test Methods for Tire Performance Testing on Snow and Ice Surfaces
• Effective Date: 10-May-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: F 811 – 01
Standard Practice for
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Accelerometer Use in Vehicles for Tire Testing
This standard is issued under the fixed designation F 811; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope inertial reaction. F 538
3.1.6 strain gage accelerometer, n—an accelerometer using
1.1 This practice covers guidelines for using accelerometers
strain gages to sense the motion of the seismic element.
in test vehicles to evaluate dynamic accelerations resulting
F 538
from various maneuvers such as braking, accelerating, or
3.2 Definitions of Terms Specific to This Standard:
cornering.
3.2.1 performance accelerometer, n—a packaged accelera-
1.2 This practice is applicable to accelerometers that are
tion measuring system with integral data processing capability.
rigidly attached to the body of the test vehicle or stabilized to
the earth-fixed axis system by means of a gyroscope.
4. Significance and Use
1.3 The values stated in SI units are to be regarded as the
4.1 The measured accelerometer output can be used to
standard. The values given in parentheses are for information
calculate traction properties of combined tire-vehicle systems
only.
for passenger cars, light trucks, and heavy trucks through use
1.4 This standard does not purport to address all of the
of applicable methods of testing.
safety concerns, if any, associated with its use. It is the
4.2 This practice is intended to achieve uniformity in test
responsibility of the user of this standard to establish appro-
vehicle accelerometer use and in accelerometer signal process-
priate safety and health practices and determine the applica-
ing. Through such usage, a basis for meaningful comparisons
bility of regulatory limitations prior to use. Specific precau-
of test results from different sources will be obtained.
tions are given in Section 6.
4.3 This practice is not applicable to accelerometers used in
2. Referenced Documents destructive testing, such as vehicle crash tests or vehicle
vibration measurements.
2.1 ASTM Standards:
F 538 Terminology Relating to the Characteristics and Per-
5. Apparatus
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formance of Tires
5.1 Body-Mounted Accelerometer—An accelerometer shall
3. Terminology be used to measure vehicle accelerations in any of the three
primary vehicle axes (use x, y, z as illustrated in Fig. 1) and
3.1 Definitions:
shall have the following specifications:
3.1.1 accelerometer, n—an instrument that senses inertial
5.1.1 Range—The full-scale range of the accelerometer
reaction to measure linear or angular acceleration. F 538
shall be at least 61.0 g and not more than6 5.0 g for units used
3.1.2 bandwidth, [1/T], n—the range of frequencies within
in the x and y axes, and at least 62.0 g and not more than 65.0
which certain performance characteristics occur; specific limits
g for units used in the z axis.
normally apply. F 538
5.1.2 Accuracy—Amplitude accuracy shall be equal or
3.1.3 g, n—a unit of acceleration where 1 g is equal to the
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better than 61 % of full scale including all error sources.
acceleration of gravity, 9.8 m/s (32.2 ft/s ). F 538
5.1.3 Bandwidth—The frequency response of the complete
3.1.4 gyro-stabilized accelerometer, n—a precision vertical
system shall be from DC to a minimum of 20 Hz. The output
gyroscope fitted with one to three accelerometers to provide
shall not vary more than 62 % of the static output over this
orthogonal measurements referenced to the earth-fixed axis
frequency range.
system. F 538
5.1.4 Temperature—The operating temperature range shall
3.1.5 servo accelerometer, n—an accelerometer containing
be, as a minimum, between −23 and 66°C (−10 and 150°F)
servo mechanisms, electronics, and a seismic element to sense
with a temperature sensitivity of less than 0.054 %/°C (0.03 %/
°F) of full scale of the sensor.
5.1.5 Cross-Axis Sensitivity—The measured output shall not
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This practice is under the jurisdiction of ASTM Committee F09 on Tires and is
be affected by more than 63 % of the accelerations acting
the direct responsibility of Subcommittee F09.10 on Equipment, Facilities, and
Calibration. perpendicular to the measurement axis.
Current edition approved May 10, 2001. Published July 2001. Originally
5.2 Gyro-Stabilized Accelerometer—Accelerometers that
published as F 811 – 83. Last previous edition F 811 – 95.
are attached to a gyro-stabilized platform for the purpose of
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Annual Book of ASTM Standards, Vol 09.02.
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