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vertical_tail.py
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vertical_tail.py
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" vertical tail "
from gpkit import Model, Variable
from .tail_aero import TailAero
from gpkitmodels.GP.aircraft.wing.wing import AeroSurf
from gpkitmodels.GP.aircraft.wing.constant_taper_chord import c_bar
from gpkitmodels.GP.aircraft.wing.wing_interior import WingInterior
from gpkitmodels.GP.aircraft.wing.wing_skin import WingSkin
#pylint: disable=invalid-name, too-many-locals, unused-variable
#pylint: disable=attribute-defined-outside-init
class VerticalTail(Model):
"vertical tail model"
def setup(self, N=3, lam=0.8):
Vv = Variable("V_v", "-", "vertical tail volume coefficient")
W = Variable("W", "lbf", "vertical tail weight")
lv = Variable("l_v", "ft", "vertical tail moment arm")
mfac = Variable("m_{fac}", 1.1, "-", "vertical tail margin factor")
cb, eta, deta, cbarmac = c_bar(lam, N)
subdict = {"\\lambda": lam, "\\bar{c}": cb, "\\eta": eta,
"\\bar{c}_{ave}": (cb[1:]+cb[:-1])/2, "\\tau": 0.08,
"\\bar{c}_{MAC}": cbarmac, "d\\eta": deta,
"C_{L_{max}}": 1.5}
self.surf = AeroSurf(N=N)
self.surf.substitutions.update(subdict)
self.skin = WingSkin()
self.skin.substitutions.update({"\\rho_{CFRP}": 0.049})
self.foam = WingInterior()
self.foam.substitutions.update({"\\bar{A}_{jh01}": 0.0548})
self.foam.substitutions.update({"\\rho_{foam}": 0.024})
self.components = [self.skin, self.foam]
constraints = [
W/mfac >= sum([c["W"] for c in self.components]),
self.skin["W"] >= (self.skin["\\rho_{CFRP}"]*self.surf["S"]*2
* self.skin["t"]*self.skin["g"]),
self.foam["W"] >= 2*(
self.foam["g"]*self.foam["\\rho_{foam}"]
*self.foam["\\bar{A}_{jh01}"]*self.surf["c_{ave}"]**2
* (self.surf["b"]/2)*self.surf["d\\eta"]).sum()
]
self.flight_model = TailAero
return constraints, self.surf, self.components