ISO 10303-214:2010(E)

Figure — Arrowleft Figure — Clause 4 Figure — Arrowright

4.2.337 Moments_of_inertia

A Moments_of_inertia describes the matrix of inertia of a rigid body. The moments of inertia I are described as follows:

Figure — Formula03

A Moments_of_inertia is a type of Shape_dependent_property.

The data associated with a Moments_of_inertia are the following:

4.2.337.1 inertia_value

The inertia_value specifies the 9 inertia coefficients.

NOTE The matrix defined by the 'inertia_value' is symmetric with respect to the main diagonal. For that reason, the values of the coefficients are equal, if mirrored along this diagonal. As a consequence, there are 6 different values in the 'inertia_value'.

See moments_of_inertia to numerical_value for the application assertion.

4.2.337.2 is_defined_in

The is_defined_in specifies the Cartesian_coordinate_space in which the property is applicable.

NOTE The values of geometry related properties are specified relative to a Cartesian_coordinate_space.

EXAMPLE The reference_axis_placement for the Moments_of_inertia is defined within the coordinate space. A Moments_of_inertia may be specified in different coordinate spaces for different purposes.

See moments_of_inertia to cartesian_coordinate_space for the application assertion.

4.2.337.3 reference_axis_placement

The reference_axis_placement specifies the Axis_placement which was used to calculate the 'inertia_value'.

See moments_of_inertia to axis_placement for the application assertion.



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