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THERMO | |
______ | |
1GWh = 10^6kWh | |
N = 490*10^6/10000 = 4.9*10^4 | |
-- | |
schéma 1 approprié | |
reçoit travail elec, fournit e thermique | |
sens source chaude à source froide | |
-- | |
centre stockage : negatif | |
fournit milieu exterieur | |
-- | |
a : reçoit, augmente | |
c : permanent: +debit +masse circule | |
a : si pelec aug, ether degr aug, temp aug | |
-- | |
Volume fluide | |
V = Dv * Delta t ref | |
Masse volume | |
m = p * V | |
m = p * Dv * Delta t ref | |
-- | |
Dernier principe thermo | |
Q = chaleur recue par système | |
P * Delta t ref + Q = 0 | |
Transfert thermique positif : | |
-Q = P * Delta t ref | |
-- | |
Expression Ts : | |
- temp entree fluide elevee | |
- puissance elec recue elevee | |
- debit volumique fluide faible | |
- masse volumique fluide faible | |
- capacité thermique fluide faible | |
cohérent q4 | |
-- | |
Dair = P/pair*cair*(Ts-Te) | |
Dair = 0.48 * 10^3 m^3*s^-1 | |
débit 1000* plus élevé, trop important | |
discrim masse volumique | |
SON | |
___ | |
I = P/S => W*m^-2 | |
L = 10 * log(I/I0) | |
att acoustique vitre : absorption | |
I1 sans att = P1/S1 | |
5.0*10^-4 W*m^-2 = 87dB | |
Derrière : 87-25 = 62dB | |
Supérieur, avion = gêne | |
I2 = P2/S2 | |
3.5*10^-8W*m^-2 = 45dB | |
Att max 45-30 = 15dB | |
Compas : 129 ~ 231° |
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Moteur courant continu | |
U = E + RI | |
Couple (Nm) | |
C = Kc * I | |
I: courant ampère (A) | |
Kc: const couple newton mètre * ampère (Nm*A^-1) | |
PHASE 1 | |
MTRUV | |
a = vf-vi/tf-ti = 0.55/0.4 | |
= 1.375m*s^-2 | |
TRD > > > > | |
A + B + P = Mr*a | |
S>R S>R G | |
> | |
/x : XA+XB-P*sin(teta)=Mr*a | |
G | |
> | |
/z : ZA+ZB-P*cos(teta) = 0 | |
tan beta = tan(11.3°) | |
= 0.2 = XB/ZB | |
tan w = tan(20°) | |
= 0.364 = XA/ZA | |
A partir eq 3 : | |
ZB*b - P*a*cos(teta) - P*h*sin(teta) - a *Mr*h = 0 | |
G | |
ZB = "" / b ce qui donne 87.94N | |
XB = 0.2*87.94 = 17.58N | |
on met val dans eq. 1 | |
XA = -XB + P*sin(teta)+aG*Mr | |
= -17.58+12*9.81*sin(5.71)+12*1.375 | |
= 10.63N | |
Action tangentielle Xmax = XB/2 = 8.79N | |
V = rayon petitOmega (w)r | |
donc w =V/rayon=0.55/0.05=11rd*s^-1 | |
r | |
On déduit Nr = 105tr*min^-1 | |
Choisi : couple 0.49, 120tr/mn | |
convient car Cr<0.49 | |
Nr < 120 | |
Vitesse roue 3 = 0.39m*s^-1 | |
roue 4 = 0.402 | |
Vitesses diff a cause perturbations frottements visqueux | |
trajectoire perturbee donc se decaler ligne droite | |
+ critere de vitesse non respecté | |
Soluce : ajouter mesure vitesse + regulation | |
Vitesse roue 3 = roue 4 ~= 0.47m/s | |
ecart |(0.47-0.55)/0.55| = 0.145 14.5% | |
conso | |
I absorbé plat : 0.16*2=0.32A | |
pente : 0.33*2=0.66A | |
Co = U*I*T = ((0.32+0.66)/2)*14.8*40/3600 | |
= 0.49*14.8*40/3600 = 0.0806W*h 2mn | |
Co4mot = Comotav+Comotar | |
= 0.065 + 0.0806 = 0.1456W*h | |
I absorbee | |
= 0.9 + 0.012 + 2 + 0.005 = 0.922A | |
P = 14.8*0.922 = 13.64W | |
Donc Energie | |
= 13.64*2/60=13.64*0.0333=0.454W*h 2mn | |
E2min = Emot+Eacc = Coacc | |
= 0.1456 + 0.454 = 0.6W*h 2mn | |
1h = 0.6*30 = 18W*h | |
Ebatt = 14.8*8 = 118W*h | |
Autonomie = 118/18 = 6.56h | |
1er octet donnée A8 | |
Bin 10101000 LSB 1er donc 00010101 | |
bit poids faible 1 donc deplacement positif | |
2ms 180° + 0.5ms | |
donc 100° = (2ms/180)*100+0.5=1.61ms | |
Algorigramme | |
0.5/20 | |
2.5/20 | |
Acquisition angle | |
RC_0_degré + (angle*Ratio) | |
elif descendre_tablette: | |
pwm.ChandeDutyCycle(rapport_cyclique_en_pourcentage(angle)) | |
angle -= 1 | |
time.sleep(0.02) | |
|x|x| OUI |x| 14.5% | Respect exigences | | |
------------------------------------------------------ | |
|x|x| OUI |x| | Ecart ds tolérance | | |
|x|x| |x| | excès de vitesse | | |
|x|x| |x| | Régulation annuler | | |
|x|x| |x| | ecarts vitesse roues | | |
|x|x| |x| | Tps reaction diminué | | |
------------------------------------------------------ | |
|x|x| NON |x| Autonomie 4.86h | Ecart très faible | | |
|x|x| |x| Ecart rel 2.8% | autonomie inférieure | | |
------------------------------------------------------ | |
|x|x| OUI |x|xxxxxxxxxxxxxxxxx| Choix pertinent | | |
|x|x| |x|xxxxxxxxxxxxxxxxx| conso faible, portee | | |
|x|x| |x|xxxxxxxxxxxxxxxxx| + orientation tablet | |
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