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T avg

N ard. N arg. N avd. Résistance de l’air: R =1/2 r scxv 2. P. N avg. T avd. R rlt. T avg. Vitesse constante. Résistance de l’air: R =1/2 r scxv 2. P. y. N avg. N arg. N avd. N ard. R rlt. T avd. T avg. x. /x: Tavd + Tavg - Rair -4Rrlt=0.

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T avg

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  1. Nard Narg Navd Résistance de l’air: R =1/2rscxv2 P Navg Tavd R rlt Tavg Vitesse constante

  2. Résistance de l’air: R =1/2rscxv2 P y Navg Narg Navd Nard R rlt Tavd Tavg x /x: Tavd+Tavg-Rair-4Rrlt=0 /y: Navd+Navg+Nard+Narg-P=0

  3. Navg Narg Navd Nard Tavd Vitesse constant et résistances négligées

  4. Nard Tard Narg Navd Tavd Targ Pression Navg Pression N Tavg cf cf N N N couple de freinage frein à tambours C= N x f x b x R^2 x (cos qa-cos qb) x(k1+k2) couple de freinage frein à disques C= N x f x rmoyenx n

  5. Card Carg Navd Cavd g Tavd V1/0 P Cavg y Nard Narg Navg Targ Tard Tavg x /x: -Tavd-Tavg-Tard-Targ=-mg

  6. Cf R T Cf=T x R

  7. Corrigé exercice : 4 freins à disques Pression arrière = 35% avant /x: -Tavd-Tavg-Tard-Targ=-mg • -Cavd/R-Cavg/R-Card/R-Carg/R=-mg • (-Cavd-Cavg-Card-Carg)/Rroue=-mg • (2Cav+2Car)=Rrouemg • (Cav+Car)=Rrouemg/2 Pav.S.f.Ravmoyen.n+0.35Pav.S.f.Rarmoyenn. =Rrouemg/2 Pavf.n.S(Ravmoyen+0.35.Rarmoyen) =Rrouemg/2 2Pavf.n.S(Ravmoyen+0.35.Rarmoyen)/Rroue.m =g Pavfplaquette/disque.n[2].p.D2piston(Ravmoyen+0.35.Rarmoyen)/2Rroue.mvéhicule= gvéhic

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