Gravity
The Gravity PropertyManager
applies linear accelerations to a part or assembly document for use in
structural and nonlinear analyses. You specify accelerations in the x,
y, and z
directions of a coordinate system defined by a reference plane or planar
face. You can also define linear acceleration along a straight edge.
Gravity loading in each direction is calculated by multiplying the specified
acceleration of gravity by the mass. The mass is calculated from the density
value of the material. If you select a material from a default library,
then the density is already defined. If you choose to input material properties
manually, make sure to specify the density. Distributed and remote masses are considered for the
supported analysis types.
For nonlinear studies, you can define time-dependent accelerations of
gravity.
To specify gravitational loading:
Do one of the following:
In the Simulation study tree, right-click
External Loads and select Gravity.
-or-
Click Simulation,
Loads/Fixture, Gravity.
-or-
Click Gravity
(Simulation toolbar).
In the PropertyManager, select a planar face,
a reference plane, or a straight edge.
The selected reference appears in the Face, Edge, Plane for Direction box
under Selected Reference.
Type a value of gravity
or click 
to apply Earth's gravity. Select Reverse
direction if required. The direction of applied gravity is shown
by an arrow in the graphics window. The gravity is applied normal to selected
plane or face and along a selected edge.
Under Advanced,
do the following:
Select the desired system of Unit
you want to use to enter the acceleration values.
Enter values for the acceleration components.
If you select a reference
plane or a planar
face, specify at least one of the following:
Along
plane Dir 1
. Type the value of the acceleration component
along direction 1 of the selected plane or face.
Along
plane Dir 2
. Type the value of the acceleration component
along direction 2 of the selected plane or face.
In an assembly, you can use
reference geometry from the assembly or the components (parts and sub-assemblies)
of the assembly.
For nonlinear studies, you can define a
time-dependent
gravitational acceleration.
If necessary, under Symbol
Settings, do the following:
Click Edit
color to change the color of the gravitational acceleration symbols.
Click the spin arrows to increase or decrease
the size of the gravitational acceleration symbols.
Click 
.