Class MassSupport

Namespace

NominalSystems.Maths

Assembly

NominalSystems.Maths.dll

A static library that helps with converting different mass values between different frames of reference. These include Center of Masses and Moment of Inertias. The frames of reference are: L -> Component (Local) Frame B -> Body Frame (Spacecraft) N -> Inertial Frame

public static class MassSupport

Inheritance

object

MassSupport

Methods

CenterOfMass_BtoL(Vector3, Matrix3, Vector3)

Converts a Center of Mass in the B frame to a Center of Mass in the L frame. This works for all thre CoM forms; Dot and Prime included, as long as the com_B_B value is the correct B frame form of the value.

public static Vector3 CenterOfMass_BtoL(Vector3 com_B_B, Matrix3 dcm_LB, Vector3 r_LB_B)

Parameters

com_B_B Vector3

[m] The center of mass (standard, dot or prime) in the B frame

dcm_LB Matrix3

[-] The rotation matrix from the L to B frames

r_LB_B Vector3

[m] The location difference between the L and B frames

Returns

Vector3

[m] The center of mass (standard, dot or prime) in the L frame

CenterOfMass_LtoB(Vector3, Matrix3, Vector3)

Converts a Center of Mass in the L frame to a Center of Mass in the B frame. This works for all thre CoM forms; Dot and Prime included, as long as the com_L_L value is the correct L frame form of the value.

public static Vector3 CenterOfMass_LtoB(Vector3 com_L_L, Matrix3 dcm_LB, Vector3 r_LB_B)

Parameters

com_L_L Vector3

[m] The center of mass (standard, dot or prime) in the L frame

dcm_LB Matrix3

[-] The rotation matrix from the L to B frames

r_LB_B Vector3

[m] The location difference between the L and B frames

Returns

Vector3

[m] The center of mass (standard, dot or prime) in the B frame

MomentOfInertiaPrime_LtoB(Matrix3, Matrix3, Vector3, Vector3, double)

Converts a Moment of Inertia Prime (which is a derivate) from the L frame to a B frame.

public static Matrix3 MomentOfInertiaPrime_LtoB(Matrix3 moiPrime_L_L, Matrix3 dcm_LB, Vector3 com_B_B, Vector3 comDot_B_B, double mass)

Parameters

moiPrime_L_L Matrix3

[kg m^2/s] The moment of inertia in the L frame

dcm_LB Matrix3

[-] The rotation matrix from the L to B frame

com_B_B Vector3

[m] The center of mass in the B frame

comDot_B_B Vector3

[m] The center of mass change in time in the B frame

mass double

[kg] The mass of the object

Returns

Matrix3

[kg m^2/s] The moment of inertia in the B frame

MomentOfInertia_BtoL(Matrix3, Matrix3, Vector3, double)

Converts a Moment of Inertia in the B frame to a Moment of Inertia in the L frame.

public static Matrix3 MomentOfInertia_BtoL(Matrix3 moi_B_B, Matrix3 dcm_LB, Vector3 com_B_B, double mass)

Parameters

moi_B_B Matrix3

[kg m^2] The moment of inertia in the B frame

dcm_LB Matrix3

[-] The rotational matrix between the L frame and the B frame

com_B_B Vector3

[m] The center of mass in the B frame

mass double

[kg] The mass of the object

Returns

Matrix3

[kg m^2] The moment of inertia in the B frame

MomentOfInertia_LtoB(Matrix3, Matrix3, Vector3, double)

Converts a Moment of Inertia in the L frame to a Moment of Inertia in the B frame.

public static Matrix3 MomentOfInertia_LtoB(Matrix3 moi_L_L, Matrix3 dcm_LB, Vector3 com_B_B, double mass)

Parameters

moi_L_L Matrix3

[kg m^2] The moment of inertia in the L frame

dcm_LB Matrix3

[-] The rotational matrix between the L frame and the B frame

com_B_B Vector3

[m] The center of mass in the B frame

mass double

[kg] The mass of the object

Returns

Matrix3

[kg m^2] The moment of inertia in the B frame