|
 This mode is typically used in a mixed 1D Seatbelt + Shell mesh for the
initial stretch between retractor and slipring at shoulder.
There is nothing further to define since the stretch will contain only
a single type of element.
End details are handled as followed:
|
At a retractor or slipring
|
The belt connects directly to the retractor or slipring element
|
|
At structure
|
The last belt node uses the relevant node on the structure
|
|
At another 1D belt element
|
The belt elements share a common node at the point.
|
|
|
 This mode may be used for any stretch of belt.
End details are handled as followed:
|
At a retractor or slipring
|
The belt connects directly to the retractor or slipring element
|
|
At deformable structure
|
A nodal rigid body is created from the line of nodes at the end
of the belt, plus the relevant node on the structure.
|
|
At rigid structure
|
The nodes on the end of the belt are placed in a node set which
is used to make an "extra nodes on rigid part" definition
assigned to the rigid structure part.
|
|
At another 2D belt element
|
A nodal rigid body of the nodes at the ends of each section would
be created. (This would be highly unusual in practice.)
|
|
|
This would be unusual since "shell only" stretches of mesh
cannot attach to slipring or retractor elements, so this would only be
applicable to an isolated stretch of belt with fixed connections at each
end. However is *is* possible to attach shells to a "meshed"
slipring.
The end details are handled as follows:
|
At deformable structure
|
A nodal rigid body is created from the line of nodes at the end
of the belt, plus the relevant node on the structure.
|
|
At rigid structure
|
The nodes on the end of the belt are placed in a node set which
is used to make an "extra nodes on rigid part" definition
assigned to the rigid structure part.
|
|
At another shell (belt) element
|
A nodal rigid body of the nodes at the ends of each section would
be created. (This would be highly unusual in practice.)
|
|
At a meshed slipring
|
The shell elements continue around the slipring, using a reduced
length per element, meeting the next segment's elements half way round.
|
|
|
|
This is the traditional method of combining connectivity through sliprings
and retractors (using 1D seatbelt elements) with good contact across the
dummy (using shells). A typical stretch of belt will be mainly shells
with a few seatbelt elements at each end.
#SB els
defines how many 1D seatbelt
elements are to be used at each end, which must be at least one if there
is a slipring or retractor at that end.
The end details are handled as follows:
|
1D belt element at structure
|
The end node of the belt element is the specified node on the structure.
|
|
1D belt element at slipring / retractor
|
The belt connects directly to the slipring/retractor.
|
|
Shell to 1D belt connection
|
A nodal rigid body is formed from the end row of shell nodes, and
the 1D belt element also has an end node in this node set.
|
|
Shell directly to deformable structure
|
A nodal rigid body is created from the line of nodes at the end
of the shell, plus the relevant node on the structure.
|
|
Shell directly to rigid structure
|
The nodes on the end of the shell are placed in a node set which
is used to make an "extra nodes on rigid part" definition
assigned to the rigid structure part.
|
|
At another shell (belt) element
|
A nodal rigid body of the nodes at the ends of each section would
be created. (This would be highly unusual in practice.)
|
|
|
|
This method could be used as a direct replacement for the mixed 1d belts
+ shells above. In this case
#SB els
defines
how many 2D belt elements are used at each end. Since 2D seatbelt elements
are really shells no special measures need to be taken at the transition
between the two element types.
The end details are handled as follows:
|
2D belt element at slipring / retractor
|
The belt connects directly to the slipring/retractor.
|
|
2D belt or Shell element directly to deformable structure
|
A nodal rigid body is created from the line of nodes at the end
of the belt/shell, plus the relevant node on the structure.
|
|
2D belt or Shell element directly to rigid structure
|
The nodes on the end of the belt/shell are placed in a node set
which is used to make an "extra nodes on rigid part" definition
assigned to the rigid structure part.
|
|
2D belt or Shell to another belt/shell (belt) element
|
A nodal rigid body of the nodes at the ends of each section would
be created. (This would be highly unusual in practice.)
|
|
|
|
This is only possible in new style meshing mode, in
PRIMER
V14 onwards. Several examples of possible mesh layouts are shown here
since the choice is completely arbitrary. The end conditions of the various
element types conform to the descriptions given above.
|
[
1d belt | shell | 2d belt
]
|
[
shell | 1d belt | shell
]
|
[
2d belt | shell | 1d belt
]
|
|
