ASTM_E_2034_-_99_2012.pdf

Designation:E203499(Reapproved 2012)Standard Practices forSimulating Truck Response to Longitudinal Profiles ofVehicular Traveled Surfaces1This standard is issued under the fixed designation E2034;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These practices cover the calculation of truck responseto longitudinal profiles of traveled surface roughness.1.2 These practices utilize computer stimulations to obtaintwo truck responses including:sprung and unsprung massvertical displacement,velocity and acceleration,and sprungmass pitch angular displacement,velocity and acceleration.1.3 These practices present standard truck simulations(quarter truck,half-single unit truck,and half-tractor semi-trailer)for use in the calculations.1.4 The values stated in SI units are to be regarded as thestandard.1.5 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 Reference2.2 ISO Standard:32631 Guide for the Evaluation of Human Exposure toWhole-Body Vibration3.Terminology3.1 See Terminology E867.4.Summary of Practice4.1 These practices use a measured profile(see Test MethodE950)or a synthesized profile as a part of a computersimulation to obtain truck response.4.2 The first practice uses a standard truck simulation toobtain truck sprung mass vertical acceleration.The accelera-tion history can be computed as a function of time or distance.One application of this practice is to use the accelerationhistory in ride quality evaluation,such as the ISO Guide 2631.Another application is to use the sprung mass vertical displace-ment history as input to a suspended seat model in ride qualityevaluation.4.3 The second practice uses a truck simulation model toobtain tire/pavement vertical forces as a function of time ordistance.One application of this practice is to use the tire/pavement history in pavement loading evaluation.44.4 For all calculations,a truck speed is selected andmaintained throughout the calculation.Pertinent informationaffecting the results must be noted.5.Significance and Use5.1 These practices provide a means for evaluating truckride quality and pavement loading exerted by truck tires.6.Apparatus6.1 ComputerThe computer is used to calculate truckresponse to a traveled surface profile using a synthesizedprofile or a profile obtained in accordance with Test MethodE950 as the input.It is recommended that a 16 or more-bitdigital computer be used.6.2 Data-Storage DeviceA data storage device shall beprovided for the reading of profiles and the recording andlong-term storage of computed data.Profile data shall be scaledto maintain resolution of 0.025 mm(0.001 in.)and to accom-modate the full range of amplitudes encountered during normal1These practices are under the jurisdiction of ASTM Committee E17 onVehicle-Pavement Systems and are the direct responsibility of Subcommittee E17.33 onMethodology for Analyzing Pavement Roughness.Current edition approved June 1,2012.Published June 2012.Orignally approvedin 1999.Last previous edition approved in 2007 as E2304 99(2007).DOI:10.1520/E2034-99R12.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Todd,K.B.,and Kulakowski,B.T.,“Simple Computer Models for PredictingRide Quality and Pavement Loading for Heavy Trucks,”Transportation ResearchRecord 1215,1989,pp.137150.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 profile-measuring operations.The devices shall not contributeto the recorded data any noise amplitude larger than 0.025 mm(0.001 in.)6.3 Simulation InputDigital profile recordings of road-roughness profiles shall be obtained in accordance with TestMethod E950 or synthesized.The profile must be recorded atintervals no greater than one third of the wavelength requiredfor accurate representation of the traveled surface for theintended use of the data.For most applications,a sampleinterval of 0.15 m(0.5 ft)will give a valid representation for alltypes of road surfaces.When more than one path of a traveledsurface is measured,the