2011

Table Of Contents

Mass properties for solids

DescriptionMass property

Radii of gyration are expressed in distance units.

Calculations that are derived from the products of inertia and that

have the same unit values. The moment of inertia is highest through

Principal mo-

ments and

a certain axis at the centroid of an object. The moment of inertia isX,Y,Z directions

about centroid lowest through the second axis that is normal to the first axis and

that also passes through the centroid. A third value included in the

results is somewhere between the high and low values.

Calculations Based on the Current UCS

The following table shows the parameters that control the units in which

mass properties are calculated.

Parameters that control MASSPROP units

Used to calculateParameter

Mass of solidsDENSITY

Volume of solidsLENGTH

Area of regions and surface area of solidsLENGTH*LENGTH

Bounding box, radii of gyration, centroid, and

perimeter

LENGTH*LENGTH*LENGTH

Moments of inertia, products of inertia, and

principal moments

DENSITY*LENGTH*LENGTH

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