...
Mass
...
values
...
are
...
calculated
...
for
...
structural
...
elements
...
according
...
to
...
volume
...
and
...
material
...
density.
...
Mass
...
is
...
then
...
automatically
...
concentrated
...
at
...
...
locations.
...
During
...
dynamic
...
analysis,
...
mass
...
translation
...
along
...
each
...
of
...
the
...
three
...
joint
...
displacement
...
degrees-of-freedom
...
(DOF)
...
correlates
...
with
...
...
to
...
create
...
...
...
.
...
Additional
...
concentrated
...
mass
...
may
...
be
...
assigned
...
to
...
joint
...
locations.
...
Further,
...
mass
...
moment
...
of
...
inertia
...
may
...
be
...
applied
...
to
...
each
...
of
...
the
...
three
...
joint
...
rotational
...
DOF
...
to
...
account
...
for
...
rotational
...
inertia.
...
Mass
...
is
...
uncoupled
...
between
...
different
...
joints,
...
and
...
between
...
DOF
...
at
...
a
...
joint
...
location.
...
Mass
...
units
...
are
...
given
...
as
...
W/g
...
,
...
and
...
mass
...
moment-of-inertia
...
units
...
are
...
given
...
as
...
WL
...
2
...
/g
...
,
...
where
...
W
...
is
...
weight,
...
L
...
is
...
length,
...
and
...
g
...
is
...
gravity.
...
Mass Tips
- After analysis is run, check joint mass by selecting Display > Show Tables > Analysis Results > Joint Output.