*NODE RESPONSE

Define nodal responses for design sensitivity analysis.

This option is used in a direct design sensitivity analysis to write nodal response sensitivities to the output database. It is also used in an adjoint design sensitivity analysis to write a nodal response and its corresponding sensitivities with respect to the appropriate design variables to the output database. It must be used in conjunction with the DESIGN RESPONSE option.

This page discusses:

See Also
*DESIGN RESPONSE
In Other Guides
Direct Design Sensitivity Analysis
Adjoint Design Sensitivity Analysis

Products Abaqus/Design

Type History data

LevelStep

Optional parameters

LOWER BOUND

This parameter is meaningful only in an adjoint design sensitivity analysis.

This parameter is used to specify a lower bound on the design response value below which adjoint sensitivities are not calculated. That is, if the value of the design response value is below the specified lower bound, then only the design response value is written to the output database, but not the corresponding adjoint sensitivities.

NSET

Set this parameter equal to the name of the node set for which the nodal design response value and its sensitivity output are calculated.

ORIENTATION

This parameter is meaningful only in an adjoint design sensitivity analysis.

Set this parameter equal to the name of an orientation definition to be used to define a local coordinate system for the node response.

OPERATOR

This parameter is meaningful only in an adjoint design sensitivity analysis.

Set OPERATOR=MAX to indicate that the maximum value of the design response across the node set is calculated.

Set OPERATOR= MAXABS to indicate that the maximum absolute value of the design response across the node set is calculated. This parameter is not available for design responses in a steady-state dynamic analysis.

Set OPERATOR=MIN to indicate that the minimum value of the design response across the node set is calculated. This value is not supported for direct steady-state dynamic adjoint sensitivity analysis.

Set OPERATOR=MINABS to indicate that the minimum absolute value of the design response across the node set is calculated. This parameter is not available for design responses in a steady-state dynamic analysis.

Set OPERATOR=SUB to indicate that the difference between the maximum and the minimum values of the design response across the node set is calculated. This value is not supported for direct steady-state dynamic adjoint sensitivity analysis.

Set OPERATOR=AVE to calculate the average value of the design response over all the nodes in the node set.

Set OPERATOR=SUM (default) to calculate the sum of the design response over all the nodes in the node set.

RANGE OPERATOR

This parameter is meaningful only in direct steady-state dynamic adjoint design sensitivity analysis.

Set RANGE OPERATOR=AVE to calculate the average value of the design response over the range of frequencies specified for the node response.

Set RANGE OPERATOR=MAX (default) to calculate the maximum value of the design response over the range of frequencies specified for the node response.

Set RANGE OPERATOR=SUM to calculate the sum of the design response over the range of frequencies specified for the node response.

UPPER BOUND

This parameter is meaningful only in an adjoint design sensitivity analysis.

This parameter is used to specify an upper bound on the design response value above which adjoint sensitivities are not calculated. In other words if the value of the design response value is above the specified upper bound, then only the design response value is written to the output database, but not the corresponding adjoint sensitivities.

Data lines to request nodal response value and sensitivity output

First line (only line in a static or a transient dynamic adjoint design sensitivity analysis)

  1. Specify the identifying keys for the responses whose values and sensitivities are to be written to the output database. Only one response key can be specified in an adjoint design sensitivity analysis. The valid keys are listed in Direct Design Sensitivity Analysis and Adjoint Design Sensitivity Analysis.

In a direct design sensitivity analysis, repeat this data line as often as necessary to define the nodal responses whose values and sensitivities are to be written to the output database.

Second line (required only for a direct steady-state dynamic adjoint sensitivity analysis)
  1. Lower limit of the frequency range for the node response, in cycles/time.
  2. Higher limit of the frequency range for the node response, in cycles/time.