www.rollerenligne.com

Code : Tout sélectionner

from math import pi, pow

DEBUG = 0

def dprint(s):
    if DEBUG:
        print s
        
class Roue(object):
    
    def __init__(self, masse, diametre, vitesse, nb_roue, tore_b=None):
        self.m = masse
        self.d = diametre
        self.v = vitesse
        self.nb_roue = nb_roue
        self.tag = " (%smm %sroues)" % (diametre, nb_roue)
        
        if tore_b:
            self.a = self.d / 2. # rayon majeur
            self.b = tore_b      # rayon mineur
        else:
            self.a = self.b = None
            
        self.energie()
        
    def energie(self):
        if self.a:
            print "Tore:" + self.tag
            I = self.m * (0.75 * pow(self.a, 2) + pow(self.b, 2))
        else:
            print "Cylindre:" + self.tag
            I = 0.5 * self.m * pow(self.d/2, 2)
            
        print "I= " + str(I)
        dprint("I= " + str(I))
        
        ms = self.v / 3.6
        dprint("ms= " + str(ms))
        
        mm = ms * 60
        dprint("mm= " + str(mm))
        
        circ = pi * self.d
        nb_tour_min = mm / circ
        dprint("nb tour min= " + str(nb_tour_min))
  
        v_angu = nb_tour_min / 60 * 2 * pi
        dprint("v_angu= " + str(v_angu))
        
        er = 0.5 * I * pow(v_angu, 2)
        dprint("er= " + str(er))
        er_tot = er * self.nb_roue
        dprint("er_tot= " + str(er_tot))
        
        ec = 0.5 * self.m * pow(ms, 2)
        dprint("ec= " + str(ec))
        ec_tot = ec * self.nb_roue
        dprint("ec_tot= " + str(ec_tot))
        
        E = er_tot + ec_tot
        print "E= " + str(E)
  
R = Roue(0.148, 0.110, 30, 8)
R = Roue(0.182, 0.125, 30, 6)

print ""

R = Roue(0.148, 0.110, 30, 8, 0.110/4.)
R = Roue(0.182, 0.125, 30, 6, 0.125/4.)