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*OBJECTIVE
Keyword type: step
With *OBJECTIVE one can define the objective functions in a sensitivity
analysis. Right now the following objectives are allowed for TYPE=COORDINATE
design variables:
- SHAPEENERGY: internal energy of the total structure or of a subset if
the parameter ELSET is used
- MASS: mass of the total structure or of a subset if
the parameter ELSET is used
- EIGENFREQUENCY: all eigenfrequencies calculated in a previous
*FREQUENCY step
- DISPLACEMENT: the sum of the square of the displacements in all nodes of
the structure or of a subset if the parameter NSET is used.
and for TYPE=ORIENTATION design variables:
- SHAPEENERGY: internal energy of the total structure or of a subset if
the parameter ELSET is used
- MASS: mass of the total structure or of a subset if
the parameter ELSET is used
- EIGENFREQUENCY: all eigenfrequencies and eigenmodes calculated in a previous
*FREQUENCY step
- DISPLACEMENT: the displacements in all nodes.
First line:
- an objective function (may be followed by a NSET or ELSET parameter is appropriate)
Repeat this line if needed.
The objective functions SHAPEENERGY, MASS and DISPLACEMENT require a *STATIC
step before the *SENSITIVITY step, the objective function EIGENFREQUENCY
requires a *FREQUENCY step immediately preceding the *SENSITIVITY
step. Therefore, the {SHAPEENERGY, MASS, DISPLACEMENT} objective functions
and the {EIGENFREQUENCY} objective function are mutually exclusive within
one and the same *SENSITIVITY step.
Example:
*OBJECTIVE
2,10,33
defines the nodes 2, 10 and 33 to be design variables.
Example files: sensitivity_I.
Next: *ORIENTATION
Up: Input deck format
Previous: *NSET
Contents
guido dhondt
2016-07-31