Drop Test Setup
The Drop Test Setup PropertyManager
sets parameters for a drop test study.
Specify
Sets the type of input you will specify.
Drop height. You specify
the height from which the model is dropped from rest.
Velocity at impact.
You specify the direction and
magnitude of the model's velocity at the moment of impact with the target
plane.
Height
Sets the height from which the body is dropped from rest. This
is the distance that the body has to travel in the direction of gravity
to hit the rigid plane. Available only when you select Drop height in
the Specify
box. The velocity at impact is calculated from Vimpact
= (2gh)1/2,
where g is the acceleration of gravity, and h is the height.
The centroid is the geometric
center of the body. For an assembly, the centroid coincides with the center
of gravity only if all components have the same density.
From lowest point. The specified height
is the smallest distance between the body and the rigid planar floor.
The closest point to the rigid planar floor is the first the point to
hit the floor as the body travels in the direction of the gravity.
Drop height 
. Specifies
height from centroid or from lowest point to the impact plane. You can
select units for height.
Velocity at Impact
Sets the direction and value of the velocity
at the time of impact. Used only if
you select Velocity at impact
in the Specify box.
Impact velocity reference. Sets the
reference entity to determine the direction of the velocity at impact.
You can select an edge, a reference plane, or planar face. If you select
a reference plane or planar face, the velocity is applied in the direction
normal to the reference plane or the planar face. Click 
to reverse the direction of the velocity at impact.
Velocity magnitude 
. Sets
the magnitude and unit of the velocity at impact.
Gravity
Sets the direction and value of the acceleration
of gravity.
Gravity reference.
Sets the reference entity to determine the direction of the gravity. You
select an edge, a reference plane, or planar face. If you select a reference
plane or planar face, the gravity is applied in the direction normal to
the reference plane or the planar face. Click to reverse
the direction of gravity.
Gravity magnitude
. Sets the magnitude and unit of the gravity.
Target
Sets the orientation of the impact plane.
Normal
to gravity. The impact plane is normal to gravity.
Parallel
to Ref. plane. The impact plane is parallel to the selected reference
plane.
Target
orientation reference 
. Select a reference plane.
Available only when Parallel to ref.
plane is selected.
Friction
Coefficient 
.
Sets the coefficient of friction between the model and the impact plane.
The program determines
the actual position of the impact plane as follows:
If
you specified the Height, the
body hits the plane after traveling the specified height distance in the
direction of gravity.
If you specified the Velocity at impact,
the body hits the plane while traveling in the specified velocity at impact.
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Actual location of the impact plane if the
height is specified.
Position
(1): Height is measured from the body centroid.
Position
(2): Height is measured from lowest point of the body. |
Actual location of the impact plane if velocity
at impact is specified |
Stiffness and thickness
Sets
properties for the flexible layer. Available only when Flexible
target is selected under Target
stiffness.
Unit 
.
Sets the system of units.
Normal
Stiffness 
. Sets the stiffness per unit area normal
to the impact plane.
Tangential
Stiffness 
. Sets the stiffness per unit area parallel
to the impact plane.
Mass
density 
. Sets the mass
density of the impact layer.
Target
thickness 
. Sets the magnitude and units for the
thickness of the impact layer.
Symbol Settings
Shows the
directions of acceleration of gravity and the velocity at impact.
Related Topics
Setting
the Drop Test Output Options
What
is Drop Test Analysis...