User Area > Advice
Typical error message found in the LUSAS Solver text output file (*.OUT):
***ERROR*** LOADING
TYPE TTPDSP COMPONENT 9 INVALID FOR SOME/ALL NODES
For structural analyses the displacement at a node
will, in general, consist of translational and/or rotational
behaviour. Each of these displacement components
are termed degrees of freedom. In general three dimensional
space there are six independent degrees of freedom which
are…
- u, v, w
translations corresponding to displacements in
the x, y, z axis directions respectively
- qx,
qy, qz
rotations corresponding to rotations about the
x, y, z axes respectively
For field (thermal) analyses there is only
one degree of freedom called the potential (F)
for all spatial dimensions. That is, one, two and three
dimensional field elements each have just the one degree
of freedom at each node. For structural analyses involving
two-phase elements, an additional degree of freedom of pressure
is supported, together with the usual structural freedoms.
The number of degrees of freedom at a node
depends entirely upon the element type. It is also governed
for some elements by whether the node is located at corner
or midside positions on the element.
There is a correspondence between these
degrees of freedom and the component mentioned in
the error message. This correspondence is documented for
each element in the results tables at the
end of the Element Reference Manual. Two possibilities for
this error message occurring are...
- Using a structural load in a thermal
analysis. There is a separate loading section for thermal
loading:
Attributes> Loading> Thermal...
- Selecting a loading component that is
not supported by the element to which it is assigned
|
