Maneuver

General Mission Analysis Tool

Maneuver

Maneuver — Perform an impulsive (instantaneous) maneuver

Script Syntax

Maneuver BurnName (SpacecraftName)

Description

The Maneuver command applies a selected ImpulsiveBurn to a selected Spacecraft. To perform an impulsive maneuver using the Maneuver command, you must create an ImpulsiveBurn. If you wish to model fuel depletion, you must associate a specific ChemicalTank hardware object with this ImpulsiveBurn and attach the ChemicalTank to the desired Spacecraft. See the Remarks and example shown below for more details.

Options

Option

Description

ImpulsiveBurnName

Allows the user to select which ImpulsiveBurn to apply. As an example, to maneuver DefaultSC using DefaultIB, the script line would appear as Maneuver DefaultIB(DefaultSC).

Accepted Data Types	Reference Array
Allowed Values	Any ImpulsiveBurn existing in the resource treet
Default Value	DefaultIB
Required	yes
Interfaces	GUI, script

SpacecraftName

Allows the user to select which Spacecraft to maneuver. The maneuver applied is specified by the ImpulsiveBurnName option above.

Accepted Data Types	Reference Array
Allowed Values	Spacecraft resource
Default Value	DefaultSC
Required	yes
Interfaces	GUI, script

GUI

The Maneuver command dialog box, as shown below, allows you to select which previously created ImpulsiveBurn should be applied to which Spacecraft.

Remarks

Fuel Depletion

To model fuel depletion associated with your chosen ImpulsiveBurn, you must configure the ImpulsiveBurn object as follows:

Set the ImpulsiveBurn parameter, Decrement Mass, equal to true.
Select a ChemicalTank for the ImpulsiveBurn object and attach this selected ChemicalTank to the Spacecraft.
Set values for the ImpulsiveBurn parameters, Isp and GravitationalAccel, which are used to calculate, via the Rocket Equation, the mass depleted.

Interactions

ImpulsiveBurn	The Maneuver command applies the specified ImpulsiveBurn to the specified Spacecraft.
ChemicalTank	The ChemicalTank specified by the ImpulsiveBurn object is (optionally) used to power the ImpulsiveBurn.
Spacecraft	This is the object that the ImpulsiveBurn is applied to.

Examples

Create a default Spacecraft and ChemicalTank and attach the ChemicalTank to the Spacecraft. Perform a 100 m/s impulsive maneuver in the Earth VNB-V direction.

%  Create default Spacecraft and ChemicalTank and attach the ChemicalTank 
%  to the Spacecraft.
Create Spacecraft DefaultSC
Create ChemicalTank FuelTank1
DefaultSC.Tanks = {FuelTank1}

%  Set ChemicalTank1 parameters to default values
FuelTank1.AllowNegativeFuelMass = false
FuelTank1.FuelMass = 756
FuelTank1.Pressure = 1500
FuelTank1.Temperature = 20
FuelTank1.RefTemperature = 20
FuelTank1.Volume = 0.75
FuelTank1.FuelDensity = 1260
FuelTank1.PressureModel = PressureRegulated

%  Create ImpulsiveBurn associated with the created ChemicalTank
Create ImpulsiveBurn IB
IB.CoordinateSystem = Local
IB.Origin = Earth
IB.Axes = VNB
IB.Element1 = 0.1
IB.Element2 = 0
IB.Element3 = 0
IB.DecrementMass = true
IB.Tank = {FuelTank1}
IB.Isp = 300
IB.GravitationalAccel = 9.810000000000001

BeginMissionSequence
%  Apply impulsive maneuver to DefaultSC
Maneuver IB(DefaultSC)

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