ASTM F811-95
(Practice)Standard Practice for Accelerometer Use in Vehicles for Tire Testing
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.
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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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: F 811 – 95
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
1
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 orthogonal measurements referenced to the earth-fixed axis
system. F 538
1.1 This practice covers guidelines for using accelerometers
3.1.5 servo accelerometer, n—an accelerometer containing
in test vehicles to evaluate dynamic accelerations resulting
servo mechanisms, electronics, and a seismic element to sense
from various maneuvers such as braking, accelerating, or
inertial reaction. F 538
cornering.
3.1.6 strain gage accelerometer, n—an accelerometer using
1.2 This practice is applicable to accelerometers that are
strain gages to sense the motion of the seismic element.
rigidly attached to the body of the test vehicle or stabilized to
F 538
the earth-fixed axis system by means of a gyroscope.
1.3 The values stated in SI units are to be regarded as the
4. Significance and Use
standard. The values given in parentheses are for information
4.1 The measured accelerometer output can be used to
only.
calculate traction properties of combined tire-vehicle systems
1.4 This standard does not purport to address all of the
in the operation of passenger cars, light trucks, and heavy
safety concerns, if any, associated with its use. It is the
trucks through use of applicable methods of testing.
responsibility of the user of this standard to establish appro-
4.2 This practice is intended to achieve uniformity in test
priate safety and health practices and determine the applica-
vehicle accelerometer use and in accelerometer signal process-
bility of regulatory limitations prior to use. Specific precau-
ing. Through such usage, a basis for meaningful comparisons
tions are given in Section 6.
of test results from different sources will be obtained.
4.3 This practice is not applicable to accelerometers used in
2. Referenced Documents
destructive testing, such as vehicle crash tests or vehicle
2.1 ASTM Standards:
vibration measurements.
F 538 Terminology Relating to the Characteristics and Per-
2
formance of Tires
5. Apparatus
5.1 Body-Mounted Accelerometer—An accelerometer shall
3. Terminology
be used to measure vehicle accelerations in any of the three
3.1 Definitions:
primary vehicle axes (use x, y, z as illustrated in Fig. 1) and
3.1.1 accelerometer, n—an instrument that senses inertial
shall have the following specifications:
reaction to measure linear or angular acceleration. F 538
5.1.1 Range—The full-scale range of the accelerometer
3.1.1.1 Discussion—For additional information on acceler-
shall be at least 61.0 g and not more than6 5.0 g for units used
ometers, refer to the Handbook of Transducers for Electronic
in the x and y axes, and at least 62.0 g and not more than 65.0
3
Measuring Systems.
g for units used in the z axis.
3.1.2 bandwidth, [1/T], n—the range of frequencies within
5.1.2 Accuracy—The static and dynamic accuracies of the
which certain performance characteristics occur; specific limits
accelerometer shall be 60.25 % of full scale including linear-
normally apply. F 538
ity, hysteresis, and repeatability.
3.1.3 g, n—a unit of acceleration where 1 g is equal to the
5.1.3 Bandwidth—The frequency response of the complete
2 2
acceleration of gravity, 9.8 m/s (32.2 ft/s ). F 538
system shall be from DC to a minimum of 20 Hz. The output
3.1.4 gyro-stabilized accelerometer, n—a precision vertical
shall not vary more than 62 % of the static output over this
gyroscope fitted with one to three accelerometers to provide
frequency range.
5.1.4 Temperature—The operating temperature range shall
be, as a minimum, between 23 and 66°C (−10 and 150°F) with
1
This practice is under the jurisdiction of ASTM Committee F-9 on Tires and is
a temperature sensitivity of less than 0.054 %/°C (0.03 %/°F).
the direct responsibility of Subcommittee F09.10 on Equipment, Facilities, and
5.1.5 Cross-Axis Sensitivity—The measured output shall not
Calibration.
Current edition approved Oct. 10, 1995. Published December 1995. Originally
be affected by more than 1 % of the accelerations acting
published as F 811 – 83. Last previous edition F 811 – 89.
perpendicular to the measurement axis.
2
Annual Book of ASTM Standards, Vol 09.02.
3
5.2 Gyro-Stabilized Accelerometer—Accelerometers that
Norton, H. N., Handbook of Transducers for Electronic Measuring Systems,
Prentice-H
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