Following analysis types are allowed with MSC Nastran®:
SOL 101
, 103
, and 106
.
Contact definitions in 101
(BCONTACT
) are also allowed.
Allowed Analysis Types for Controller-Based and Sensitivity-Based Optimizations
In MSC Nastran®,
the responses from the following analysis types are allowed:
Solution types |
TOPO |
SHAPE |
BEAD |
SIZING |
SOL 101
Linear static |
C, S |
C, S |
C, S |
S |
SOL 103
Modal analysis |
C, S |
C, S |
C, S |
S |
SOL 106
Nonlinear analysis |
C |
C |
C |
|
- C = controller-based optimizations
- S = sensitivity-based optimizations
SOL 101
and SOL 103
represent the linear static and linear
eigenvalue analysis, respectively. Therefore, you must define a finite element file (for example,
bdf) containing the SOL 101
and another finite element file (for example, bdf)
containing the SOL 103
when both the responses from the static and frequency
analysis are applied in the optimization formulation (for example, minimizing the compliance but still
ensuring that the first eigenfrequency is higher than a given value).
However, there is a workaround to reduce the finite element analysis CPU-time for
MSC Nastran®
when responses consist of both static and modal responses. Only the SOL 103
solution can be used when both the responses from the static and frequency analysis are applied
in the optimization formulation. This is done by adding static
load case
in the SOL 103
solution.
An example of combining
several frequency analyses and several static analyses in SOL
103
is given below:
SOL 103
...
SUBCASE 1
$ dynamic loadcase 1
METHOD=....
SPC = ....
$ the structure is prestressed.
$ The REFEERED subcase (20) has no stresses !
STATSUB = 20
SUBCASE 2
$ dynamic loadcase 2
METHOD=....
SPC = .....
$ the structure is prestressed.
$ The REFEERED subcase (20) has no stresses !
STATSUB = 20
.......
SUBCASE 13
$ Static loadcase 1
SPC = ....
LOAD = ....
SUBCASE 14
$ Static loadcase 2
SPC = ...
LOAD = ...
…………..
SUBCASE 20
$ DUMMY static loadcase, which is stress free !
$ The command load should NOT be present here !
$ Boundary conditions are added for ensuring
$ no singularities of the global stiffness and mass matrix
SPC = 3
BEGIN BULK
……..
ENDDATA
Temperature Loading
TEMPERATURE(LOAD)
or TEMPERATURE(BOTH)
in sub cases referring to the following types are supported for temperature
loadings using SIMULIA Tosca Structure:
-
TEMP
-
TEMPD
-
TEMPP1
-
TEMPRB
-
TEMPAX