## Mass property definition

@MASS_PROPERTY_DEFINITION {
@MASS_PROPERTY_NAME {MassPropName} {
@TOTAL_MASS {m00}
@CENTRE_OF_MASS_LOCATION {η1, η2, η3}
@MOMENTS_OF_INERTIA {ρ11, ρ12, ρ13, ρ22, ρ23, ρ33}
@WITH_RESPECT_TO_MASS_CENTRE {CenterFlag}
}
}

### NOTES

1. This section defined the mass properties of a rigid body mass. m00 is the total mass of the body.
2. ##### Figure 1. Configuration of the rigid body.
3. The configuration of the rigid body is depicted in fig. 1. Point B is the reference point of the rigid body coordinates η1, η2, and η3 of the center of mass are defined in the local coordinate system attached to the corresponding rigid body.
4. The components of the moment of inertia tensor, ρ11, ρ12, ρ13, ρ22, ρ23, and ρ33, are defined in the local coordinate system. Two reference points are possible for this definition depending on the value of the parameter CenterFlag. (Default value: CenterFlag = NO)
• if CenterFlag = NO, the components of the moment of inertia tensor are measured in the local coordinate system, with respect to the origin of the local coordinate system. For this option, ρ11, ρ12, ρ13, ρ22, ρ23, ρ33 are the components of tensor ρB, as defined in eq. 4.
• if CenterFlag = YES the moments of inertia are measured in the local coordinate system, with respect to the center of mass of the body. For this option, ρ11, ρ12, ρ13, ρ22, ρ23, ρ33 are the components of tensor IC, as defined in this eq. (4).
• The relationship between tensors ρB and ρC is readily found based on the parallel axis theorem, see eq. (5).
5. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.