RCAIDE.Library.Methods.Mass_Properties.Weight_Buildups.Cryogenic.Transport.Semi_Empirical.compute_operating_empty_weight

compute_operating_empty_weight#

compute_operating_empty_weight(vehicle, settings=None)[source]#
Main function that estimates the zero-fuel weight of a transport aircraft:

  • MTOW = WZFW + FUEL

  • WZFW = WOE + WPAYLOAD

  • WOE = WE + WOPERATING_ITEMS

  • WE = WSTRCT + WPROP + WSYS

Assumptions:

  1. All nacelles are identical

  2. The number of nacelles is the same as the number of engines

Source:

FLOPS method: The Flight Optimization System Weight Estimation Method

Inputs:
vehicle - data dictionary with vehicle properties [dimensionless]
-.networks: data dictionary with all the network elements and properties
-.total_weight: total weight of the propulsion system [kg]

(optional, calculated if not included)

-.fuselages: data dictionary with the fuselage properties of the vehicle -.wings: data dictionary with all the wing properties of the vehicle, including horzinotal and vertical stabilizers -.wings[‘main_wing’]: data dictionary with main wing properties

-.flap_ratio: flap surface area over wing surface area

-.mass_properties: data dictionary with all the main mass properties of the vehicle including MTOW, ZFW, EW and OEW

method_type - weight estimation method chosen, available:

  • FLOPS Simple

  • FLOPS Complex

Outputs:

output - data dictionary with the weight breakdown of the vehicle

-.propulsion:

-.total: total propulsive system weight -.engines: dry engine weight -.thrust_reversers: thrust reversers weight -.miscellaneous: engine controls and starter -.fuel_system: fuel lines and pumps weight -.fuel_tanks: fuel tank structural weight -.electrical_cabling: power and sensor cable weight -.thermal_management: cooling system weight -.battery: battery weight -.motors: electric motor weight

-.structural:

-.total: total structural weight -.wings: wing weight -.fuselage: fuselage weight (or center_body + aft_center_body for BWB) -.empennage: horizontal and vertical tail weight -.landing_gear: main and nose gear weight -.nacelle: nacelle weight -.booms: boom weight -.paint: paint weight

-.systems:

-.total: total system weight -.control_systems: flight control system weight -.apu: auxiliary power unit weight -.electrical: electrical system weight -.avionics: avionics weight -.hydraulics: hydraulics and pneumatics weight -.furnishings: furnishing weight -.air_conditioner: air conditioning weight -.instruments: instrumentation weight

-.payload:

-.total: total payload weight -.passengers: passenger weight -.baggage: baggage weight -.cargo: cargo weight

-.operational_items:

-.total: total operating items weight -.misc: unusable fuel, engine oil, cargo containers -.flight_crew: flight crew weight -.flight_attendants: flight attendants weight -.passenger_service: passenger service weight

-.empty.total = structural.total + propulsion.total + systems.total -.zero_fuel_weight = empty.total + payload.total -.max_takeoff: maximum takeoff weight

Properties Used:

N/A