~.AW!!TheEngineering~ Resource For~ Advancing Mobility 400COMMONWEAL THDRIVEWARRENDALE, PA15096 861282 Performance of1-3Traction Implement TiresonConcrete JamesSummers, KelvinSelf, andGalenMcLaughlin Agricultural Engineering Dept. Oklahoma StateUniv. Stillwater, OK JohnHart, RandallHughey, andRichardSharp TheCharles Machine Works,Inc. Perry,OK International Off-Highway &Powerplanl Congress&Exposition Milwaukee, Wisconsin September 8-11.1986Downloaded from SAE International by Columbia Univ, Tuesday, August 21, 2018Theappearance ofthecodeatthebotlom 01thefirstpage01thispaperindicates SAE'sconsentthatcopies01thepapermaybemadeforpers::ma! orintern~luse,or forthepersonal orinternaluseofspecificclients.Thisconsent isgivenonthecon­ dition.however, thatthecopierpaythestatedperarticlecopyfeethrough the Copyright Clearance Center,Inc.,Operations Center,P.O.Box765,Schenectady, N.Y.12301,forcopying beyondthatpermitted bySections 107or108oftheU.S. Copyright Law.Thisconsent doesnotextendtootherkindsofcopying suchas copying forgeneral distribution, foradvertising orpromotional purposes, for creating newcollective works,orforresale. Paperspublished priorto1978mayalsobecopiedataperpaperfeeof$2.50 undertheabovestatedconditions. SAEroutinely stocksprinledpapersforaperiodofthreeyearsfollowing dateof publication. DirectyourorderstoSAEOrdp.rDepartment. Toobtainquantity reprintrates.permission toreprintatechnical paperorper· mission tousecopyrighted SAEpublications inotherworks.contact theSAE Publications Division. III.Ui/'_'/'(" Jr<',;hIT'HIt'.! J"J"'J......, '"th.'S..lI(;r"h"',1/,,/,,111\'n""h,;«' SAE(;LOIl.\l MOOILITY II.\.T,\lI,1,SE Nopartorthispublication maybereproduced inanyform,in anelectronic retrieval systemorotherwise, without theprior writtenpermission orthepUblisher. ISSN0148·7191 Copyright ©1986SocietyofAutomotive Engineers, Inc. Thispapt'rissunjccitorcvision. Statemel1lS andopinions ad· ~'anccdinpapersordisnlssion arctheat:thor's andan:his rcsponsihility. nolSAL's;howt.'vcr. tht.'paperhasbeencditt'd bySAlforunifor111 stylingandfOfm;J\. Discussion willbe printedwiththep;Jperifitispuhlished inSALTransactions. lorpt'flni~sion 10publishIhispaperinfullorinp;Jft.l'ontat:l theSAtPuhlkations Dh·ision.Pcrsons wishing tosubmitpapcrstobenlOsidered forprt'­ scntiltion orpublkation through SAl:"shouldst'ndthelllanu­ sniptora300wordabstrat't ofapropost.'d manuscript 10: Senctary. Fng:inct'ring Activit}" Board,SAl'. I'rintt'dinL1.S.A.Downloaded from SAE International by Columbia Univ, Tuesday, August 21, 2018861282 Performance of1-3Traction Implement TiresonConcrete JamesSummers, KelvinSelf, andGalenMcLaughlin AgricuJ!ural Engineering Dept. Oklahoma SlateUniv. Stillwater, OK JohnHart, RandallHughey, andRichard Sharp TheCharles Machine Works.Inc. (1) (2)ABSTRACT Tractive performance testswereperformed withfourI-3traction implement tiresoncon­ crete. Differences inthetireswerelugangle, lugpattern andtireprofile. Nettraction. towedforce, loadtransfer, actualvelocity and axlespeedweremeasured. Pull-to- dynamic load ratio.tractive efficiency andwheelslipwere calculated. Curves werefittothedatatodes­ cribetractive performance. Significant differ­ enceswerefoundinthepull-to-dynamic loadra­ tioofthefourtires. TRACTIVE PERFORHANCE OFTIRESisanimportant factorinthedesignofprimemovers. Whensimu­ latingvehicle performance. thepull-to-dynamic loadratioorcoefficient oftraction, isneeded toestimate available drawbar pullanddrawbar power. Thepull-to-dynamic loadratioisneeded todetermine changes indrivetrainstresses withchanges indynamic loadonthetires. Trac­ tiveefficiency isneeded tooptimize theeffi­ ciencyofprimemoverconverting engine powerin­ todrawbar power. Nettractive forceorpullvaries withdy­ namicload.wheelslipandinflation pressure on mosttraction surfaces. Tractive performance relationships foragricultural tractor drive tires(R-I)havebeenpresented forconcrete (1. 2.3).Adatavoidexists ontheeffects ofdy­ namicload,wheelslipandinflation pressure on tractive p