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SUAVE
2.5.2
An Aerospace Vehicle Environment for Designing Future Aircraft
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SUAVE
2.5.2
An Aerospace Vehicle Environment for Designing Future Aircraft
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Provides structural weight correlations for a BWB concept. More...
Functions | |
| def | SUAVE.Methods.Weights.Correlations.BWB.aft_centerbody.aft_centerbody (no_of_engines, aft_centerbody_area, aft_centerbody_taper, TOGW) |
| def | SUAVE.Methods.Weights.Correlations.BWB.cabin.cabin (cabin_area, TOGW) |
| def | SUAVE.Methods.Weights.Correlations.BWB.empty.empty (vehicle) |
Provides structural weight correlations for a BWB concept.
| def SUAVE.Methods.Weights.Correlations.BWB.aft_centerbody.aft_centerbody | ( | no_of_engines, | |
| aft_centerbody_area, | |||
| aft_centerbody_taper, | |||
| TOGW | |||
| ) |
Weight estimate for the aft section of a BWB centerbody.
Regression from FEA by K. Bradley (George Washington University).
Assumptions:
-The engines are mounted on the aft centerbody
-The aft centerbody is unpressurized
Sources:
Bradley, K. R., "A Sizing Methodology for the Conceptual Design of
Blended-Wing-Body Transports," NASA/CR-2004-213016, 2004.
Inputs:
no_of_engines - the number of engines mounted on the aft centerbody
[dimensionless]
aft_centerbody_area - the planform area of the aft centerbody.
Typcially the area behind 70% chord [meters**2]
aft_centerbody_taper - the taper ratio of the aft centerbody (exclude
the chord taken up by the pressurized passenger cabin) [dimensionless]
TOGW - Takeoff gross weight of the aircraft [kilograms]
Outputs:
aft_wt - the estimated structural weight of the BWB aft centerbody
Properties Used:
N/A
| def SUAVE.Methods.Weights.Correlations.BWB.cabin.cabin | ( | cabin_area, | |
| TOGW | |||
| ) |
Weight estimate for the cabin (forward section of centerbody) of a BWB.
Regression from FEA by K. Bradley (George Washington University).
Assumptions:
-The centerbody uses a pressurized sandwich composite structure
-Ultimate cabin pressure differential of 18.6psi
-Critical flight condition: +2.5g maneuver at maximum TOGW
Sources:
Bradley, K. R., "A Sizing Methodology for the Conceptual Design of
Blended-Wing-Body Transports," NASA/CR-2004-213016, 2004.
Inputs:
cabin_area - the planform area representing the passenger cabin [meters**2]
TOGW - Takeoff gross weight of the aircraft [kilograms]
Outputs:
cabin_wt - the estimated structural weight of the BWB cabin [kilograms]
Properties Used:
N/A
| def SUAVE.Methods.Weights.Correlations.BWB.empty.empty | ( | vehicle | ) |
This is for a BWB aircraft configuration.
Assumptions:
Calculated aircraft weight from correlations created per component of historical aircraft
The wings are made out of aluminum.
A wing with the tag 'main_wing' exists.
Source:
N/A
Inputs:
engine - a data dictionary with the fields:
thrust_sls - sea level static thrust of a single engine [Newtons]
wing - a data dictionary with the fields:
gross_area - wing gross area [meters**2]
span - span of the wing [meters]
taper - taper ratio of the wing [dimensionless]
t_c - thickness-to-chord ratio of the wing [dimensionless]
sweep - sweep angle of the wing [radians]
mac - mean aerodynamic chord of the wing [meters]
r_c - wing root chord [meters]
aircraft - a data dictionary with the fields:
Nult - ultimate load of the aircraft [dimensionless]
Nlim - limit load factor at zero fuel weight of the aircraft [dimensionless]
TOW - maximum takeoff weight of the aircraft [kilograms]
zfw - maximum zero fuel weight of the aircraft [kilograms]
num_eng - number of engines on the aircraft [dimensionless]
num_pax - number of passengers on the aircraft [dimensionless]
wt_cargo - weight of the bulk cargo being carried on the aircraft [kilograms]
num_seats - number of seats installed on the aircraft [dimensionless]
ctrl - specifies if the control system is "fully powered", "partially powered", or not powered [dimensionless]
ac - determines type of instruments, electronics, and operating items based on types:
"short-range", "medium-range", "long-range", "business", "cargo", "commuter", "sst" [dimensionless]
fuselage - a data dictionary with the fields:
area - fuselage wetted area [meters**2]
diff_p - Maximum fuselage pressure differential [Pascal]
width - width of the fuselage [meters]
height - height of the fuselage [meters]
length - length of the fuselage [meters]
Outputs:
output - a data dictionary with fields:
wt_payload - weight of the passengers plus baggage and paid cargo [kilograms]
wt_pax - weight of all the passengers [kilogram]
wt_bag - weight of all the baggage [kilogram]
wt_fuel - weight of the fuel carried [kilogram]
wt_empty - operating empty weight of the aircraft [kilograms]
Properties Used:
N/A
1.8.15