资源描述：
《Design Alternatives for MotoGP Engines》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、DieEntwicklungsalternativenfürGrandPrixMotorradmotorenDesignAlternativesforMotoGPEnginesGordonP.Blair1.AbstractFrom2002theFIM(FederationInternationaleMotocycliste)sanctionedtheuseof3990cm,naturally-aspirated,spark-ignition,multi-cylinderenginesoperatingonpetrolforracingintheprestigeandfastes
2、tGrandPrixcategory,i.e.,MotoGP.This99033cmclassificationreplacedwhathadbeena500cmclasssincethedawnofmotorcycleracingandwhereinrecentdecadesthetwo-strokeengineofsome3-or4-cylindersandproducingsome200hphadeliminatedallcompetitionfromfour-3strokeengineswhichwouldstruggletoproduceperhaps150hpfro
3、ma500cmengine.Consequently,thedesignersofracingengineshadtolearnnewdesigntechniquesandmuch,ifnotall,ofthetheoryoftuninglearnedthehardwayon2-strokeshadtoberapidlyunlearned.Manycompanies,suchasHonda,Yamaha,orDucati,tonamebutthree,alreadycompetedinWorldSuperbikeswhereallengines33werehistoricall
4、y1000cmfour-stroketwin-cylinder,or750cmfour-cylinder,or9003cmthree-cylinderunits.Withinsuchorganisationsmuchexperiencealreadyexistedondesigninganddevelopingfour-strokemulti-cylinderracingengines.However,inMotoGP,thechoiceofenginelayoutismuchwiderandtheselectionofthefinaldesignlayoutforMotoGP
5、racingoftendevolvedtopersonalchoice,copyingofthatwhichisdeemedtobecurrentlysuccessful,ortosomelong-heldbutasyetunproventheory.ThispaperattemptstosetoutsomelogicforanymechanicaldesigntobeselectedforMotoGPracingand,inparticular,showstheadvantagesanddisadvantagesofdesignswithtwotosixcylindersal
6、lnominallyproducingthesamepoweroutputofsome230hpat15000rpm.2.TheGeometricLayoutDesignParametersInastatementoftheobvious,theenginehastofitintoamotorcycleandbematedtoa(probablysix-speedmechanicallyfoot-operated)gearbox.Thismeansthatwidth,centre-of-gravitylocations,andweightoftheengineareallsig
7、nificantdesignparameters.Almostwithoutdiscussion,theenginewillbeliquid-cooledandalsowithoutexcessivedisagreementwillprobablyhavefour-valvespercylinderinapentroof-typecombustionchamber.Thevalveoperationwillbedouble-overheadcamshaftsandthevalvefollow
