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MessagePosté le: Ven 7 Oct - 15:04 (2016)    Sujet du message: Cbr Method Airport Pavement Design Software Répondre en citant




Cbr Method Airport Pavement Design Software > shorl.com/bridrojofrevuvi











6704223018
LEDFAA...computes...damage...caused...by...the...6-wheeled...strut...of...the...B777...that...is...similar...to...that...calculated...by...traditional...empirical...CBR-based...methods....The..authors..wish..to..acknowledge..Ian..Rickards..for..his..enthusiastic..support..and..active..participation..in..our..research...The...B777...has...6-wheel...dual...tridem...landing...gears...[CAPTION:...Figure...1)....In...its...present...form...it...treats...only...single...wheel...groups...and...so...does...not...attempt...to...allow...for...interaction...effects...between...wheel...groups....The...major...specifications...for...the...facility...are...as...follows:...Test...track...275...metres...long...by...18...metres...wide....Instead..the..strain..distribution..(not..just..a..single..maximum..strain)..at..all..points..across..the..pavement..for..a..given..depth..is..used..to..capture..the..damage..contributions..of..all..the..aircraft..wheels..in..all..their..wandering..positions...This..has..lead..to..minor..modifications..to..the..ACN..calculation..method..so..that..interim..ACN..values..could..be..assigned..to..the..B777...This.contrasts.with.earlier.methods.that.compute.only.single.maximum.values.of.the.damage..Ltd..

In...addition,...many...pavements...constructed...over...weak...soils...are...more...than...2...m...thick...to...cater...for...large...numbers...of...heavy...aircraft...such...as...the...Boeing...747....The.availability.of.such.a.methodology.is.also.important.for.aircraft.manufacturers,.to.allow.them.to.design.landing.gears.that.will.not.overstress.the.worlds.existing.runways,.and.yet.will.optimise.aircraft.performance..Most.significantly.the.APSDS.model.of.the.full-scale.test.data.generated.by.the.Corps.of.Engineers.over.many.years.has.significantly.less.scatter.than.other.methods.of.analysis..The..recently..released..FAA..computer..program,..LEDFAA..(Layered..Elastic..Design..Federal..Aviation..Administration)..is..based..on..the..coverage..concept...This..has..been..the..case..with..APSDS...This.is.considered.to.be.a.transitional.measure,.and.it.is.expected.that.modulus.values.will.be.changed.over.time.to.better.model.the.pavement.as.performance.data.becomes.available..Not.registered?.Create.a.free.account..The.large.wheel.groups.of.the.new.and.proposed.large.aircraft.should.cause.less.surface.rutting.than.predicted.by.current.methods.and.may.not.be.significantly.more.damaging.to.flexible.pavements.than.present.generation.aircraft..

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