ASTM_E_1448_-_E_1448M_-_09_2015.pdf

Designation:E1448/E1448M09(Reapproved 2015)Standard Practice forCalibration of Systems Used for Measuring VehicularResponse to Pavement Roughness1This standard is issued under the fixed designation E1448/E1448M;the number immediately following the designation indicates the yearof 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.Scope1.1 This practice describes equipment and procedures forthe calibration of systems used for measuring vehicular re-sponse to pavement roughness.Such systems are referred to asresponse-type systems.(See Test Method E1082.)1.2 The response-type system includes the driven vehicle,the driver and contents of the vehicle,the towed trailer(if oneis used with the system),and a device called a road meter thatmeasures the vehicle response to pavement roughness.Theroad meter may be mounted in an automobile,van,or in atowed trailer.Response-type(road meter)devices covered inthis practice include:devices measuring the relative axle-bodymotion of a vehicle,devices measuring the vertical accelera-tion of the vehicle body,and devices measuring the verticalacceleration of the vehicle axle.1.3 The calibration procedures described in this practice arelimited to the use of the simulations described in PracticeE1170.1.4 This practice is not intended to apply to pavementroughness measuring equipment whose output is not influencedby the response of the host vehicle.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E867 Terminology Relating to Vehicle-Pavement SystemsE950 Test Method for Measuring the Longitudinal Profile ofTraveled Surfaces with an Accelerometer EstablishedInertial Profiling ReferenceE1082 Test Method for Measurement of Vehicular Responseto Traveled Surface RoughnessE1170 Practices for Simulating Vehicular Response to Lon-gitudinal Profiles of Traveled SurfacesE1215 Specification for Trailers Used for Measuring Vehicu-lar Response to Road RoughnessE1364 Test Method for Measuring Road Roughness byStatic Level MethodE1926 Practice for Computing International Roughness In-dex of Roads from Longitudinal Profile Measurements3.Terminology3.1 Definitions:3.1.1 half-car roughness index(HRI)an index resultingfrom a mathematical simulation of vehicular response to thelongitudinal profile of two wheelpaths of a pavement using thehalf-car simulation model described in Practice E1170 and atraveling speed of 80 km/h 50 mph.Units are in millimetersper kilometer or inches per mile.3.1.2 international roughness index(IRI)an index result-ing from a mathematical simulation of vehicular response tothe longitudinal profile of one wheelpath of a pavement usingthe quarter-car simulation model described in Practice E1170and a traveling speed of 80 km/h 50 mph.Units are inmillimeters per kilometer or inches per mile.3.1.3 Additional definitions of terms related to this practicemay be found in Definitions E867.3.2 Definitions of Terms Specific to This Standard:3.2.1 response type system number(RTSN)the raw mea-sured output from a response-type system being calibrated.1This practice is under the jurisdiction of ASTM Committee E17 on Vehicle-Pavement Systems and is the direct responsibility of Subcommittee E17.31 onMethods for Measuring Profile and Roughness.Current edition approved Sept.1,2015.Published December 2015.Originallyapproved in 1992.Last previous edition approved in 2009 as E1448 09.DOI:10.1520/E1448_E1448M-09R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Units are arbitrary,being whatever the road meter in theresponse type system measures.4.Significance and Use4.1 Measures obtained by a response-type system dependprimarily on the vehicle design and condition,the load,themeasuring speed,and a host of environmental conditions.Evenwith control of all significant variables,the response of everyvehicle is unique.Thus,raw measures from such a system arenot reproducible with other systems.4.2 The calibration described in this practice provides amethod for converting