ASTM_F_2137_-_15.pdf

Designation:F213715Standard Practice forMeasuring the Dynamic Characteristics of AmusementRides and Devices1This standard is issued under the fixed designation F2137;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 This practice covers acquisition of data related to thedynamic characteristics of amusement rides and devices.1.2 This practice also defines the specific requirements of aStandardized Amusement Ride Characterization Test(SARCTest)for use in characterizing the dynamic motion of anamusement ride or device.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3.1 ExceptionThe values are reversed in Section 13since EN standards primarily use SI units.2.Referenced Documents2.1 ASTM Standards:2F747 Terminology Relating to Amusement Rides and De-vices2.2 SAE Standard:3SAE J211 Instrumentation for Impact Tests2.3 EN Standard:4EN 13814 Fairground and amusement park machinery andstructures-Safety3.Terminology3.1 Definitions:3.1.1 aliasinga phenomenon associated with sampled datasystems,wherein a signal containing significant energy atfrequencies greater than one half of the system sample fre-quency manifests itself in the sampled data as a lowerfrequency(aliased)signal.Aliasing can be avoided only bylimiting the frequency content of the signal prior to thesampling process.Once a signal has been aliased,it is notpossible to reconstruct the original signal from the sampleddata.3.1.2 calibration constantthe arithmetic mean of the sen-sitivity coefficients,evaluated at frequencies that are evenlyspaced on a logarithmic scale between FLand FH.3.1.3 calibration valuethe ratio of the reference calibra-tion system output,in engineering units relevant to thetransducer,to the data channel output,in volts,as measured atconstant excitation frequency and amplitude.3.1.4 channel frequency class(CFC)a frequency responseenvelope that conforms to Fig.1 and is referred to by the valueFHin hertz.The CFC frequency response envelope is definedby the boundaries shown in Fig.1 and the following charac-teristic frequencies:FLPass band lower limit(hertz).Always equal to zero(0.0)hertz.FHPass band upper limit(hertz).The CFC designator.FNThe corner or knee of the frequency response envelope.Always equal to or greater than 1.667 FH.FSThe minimum sample frequency for a sampled datasystem that corresponds to the designated CFC.Always equalto or greater than 12 FH.3.1.4.1 DiscussionFL,FH,FN,and FSare always specifiedin hertz.While the characteristics of the CFC may be appliedto individual components of a data channel,the CFC is,bydefinition,the frequency response envelope of the entire datachannel from the mounted transducer to the final representationof the acquired data.3.1.5 coordinate systemthree orthogonal axes that inter-sect at an origin whose positive directions correspond to theright-hand rule.3.1.5.1 measurement coordinate systema coordinate sys-tem that provides the reference axes and sign convention forthe test data record(s).3.1.5.2 patron coordinate systema coordinate system thatis fixed with respect to the human upper torso and oriented asin Fig.2.1This practice is under the jurisdiction ofASTM Committee F24 on AmusementRides and Devices and is the direct responsibility of Subcommittee F24.10 on TestMethods.Current edition approved Feb.1,2015.Published March 2015.Originallyapproved in 2001.Last previous edition approved in 2013 as F2137 13.DOI:10.1520/F2137-15.2For 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 Society of Automotive Engineers,400 Commonwealth Drive,Warrendale,PA 15096.4Available from European Committee for Standardization,http:/www.cen.eu/.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.5.3 vehicle coordinate systema coordinate system thatis fixed with respect to the ride or device being tested.3.1.6 data channelthe entire instrumentation system for asingle channel of data acquisition;from the transducer to thefinal representation of the data,including all post-acquisitiondata processing that may alter the amplitude or frequencycontent of the data.3.1.7 data channel full scalethe maximum usable value,in units of the physical phenomenon being measured,that maybe represented by a data channel.This value is determined bythe data channel component with the lowest full-scale range.3.1.8 free-run timea period of time during the ride cyclewhen