/DRESP1

Optimization Keyword Defines a response or a set of responses that are a result of a design analysis iteration. These responses can be used to drive the optimization process and are a measure of how a model performs under a set of constraints, boundary conditions and loading. They can be used as a design objective or as design constraints.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/DRESP1/resp_ID
title
RTYPE PTYPE REGION ATTA ATTB ATTI ATTJ      

Definitions

Field Contents SI Unit Example
resp_ID Design response identifier.

(Integer > 0)

  
title Title.

(Character, maximum 100 characters)

  
RTYPE Response type for an optimization run.
= 1
Mass
= 2
Fraction of mass
= 3
Volume
= 4
Fraction of design volume
= 5
Displacement
= 6
Stress
= 7
Strain
= 8
Internal strain energy
= 9
Velocity

(Integer > 0)

  
PTYPE Entity type for the definition of the optimization response.
= 1
Node
= 2
Element
= 3
Part

(Integer > 0 or blank)

PTYPE can be blank only when RTYPE=1, 2, 3, 4 or 8, which implies that the response is defined on the entire model.

  
REGION Region identifier.

Default = 0 (Integer ≥ 0)

  
ATTA Attributes of a response where further definition is required. 1

Default = 0 (Integer ≥ 0)

  
ATTB Attributes of a response where further definition is required. 1

Default = 0 (Integer ≥ 0)

  
ATTI Identification number of a group of entities for which the response is defined.

If PTYPE = 1: node group identifier

If PTYPE = 2: element group identifier

If PTYPE = 3: part group identifier

(Integer > 0 or blank)

  
ATTJ Additional definition of the entity type (only needed when PTYPE=2)
= 101
BEAM element
= 102
TRUSS element
= 103
SPRING element
= 201
SHELL element
= 202
SH3N element
= 301
BRICK element

(Integer > 0 or blank)

  

Example

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/DRESP1/1       
Response is mass summary of part group ID 2000329
### RTYPE=1: Mass
### PTYPE=3: Part
### ATTB=1 : SUM (summary)
### ATTI=2000329 : 2000329 is part group identifier due to PTYPE = 3
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#    RTYPE     PTYPE    REGION      ATTA      ATTB      ATTI
         1         3                             2   2000329
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|   
/DRESP1/2       
Response is Y translational displacement of node group ID 2021524 
### RTYPE=5: Displacement
### PTYPE=1: Node
### ATTA=2 : Displacement component of Translational Y
### ATTI=2021524 : 2021524 is node group identifier due to PTYPE = 1
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#    RTYPE     PTYPE    REGION      ATTA      ATTB      ATTI
         5         1                   2             2021524
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

Comments

  1. Response and Entity type table.
    Response Type (RTYPE) Entity type (PTYPE) ATTA ATTB
    Mass (1) Part (3) or blank - =2: SUM

    Or blank
    Fraction of mass (2) Part (3) or blank - =1: COMB

    =2: SUM

    Or blank
    Volume (3) Part (3) or blank - =2: SUM

    Or blank
    Fraction of design volume (4) Part (3) or blank - =1: COMB

    =2: SUM

    Or blank
    Displacement (5) Node (1) Displacement component code. 2 -
    Stress (6) Element (2), Part (3) Stress item code. 3 >0: Cluster size

    Or blank
    Strain (7) Element (2), Part (3) Strain item code -
    Internal strain energy (8) Part (3) or blank - =2: SUB

    Or blank
    Velocity (9) Node (1) Velocity component code. 2  
  2. ATTA for Displacement and Velocity component code.
    ATTA Value Displacement Component
    1 Translational X
    2 Translational Y
    3 Translational Z
    4 Rotational X
    5 Rotational Y
    6 Rotational Z
    7 Total displacement
    8 Total rotation
  3. ATTA for stress/strain item code.
    TRUSS elements:
    ATTA Value Stress/Strain Item
    0 or blank Both ends
    1 End A
    2 End B
    Beam elements:
    ATTA Value Stress/Strain Item
    0 or blank All stresses/strains
    4 End A pt. C
    5 End A pt. D
    6 End A pt. E
    7 End A pt. F
    104 End B pt. C
    105 End B pt. D
    106 End B pt. E
    107 End B pt. F
    8 Max end A
    108 Max end B
    All Solid elements:
    ATTA Value Stress/Strain Item
    13 von Mises
    101* Max Principal Stress
    8 Major Principal
    16 Mid Principal
    22 Minor Principal
    6 Normal X
    14 Normal Y
    20 Normal Z
    7 Shear XY
    15 Shear YZ
    21 Shear XZ
    102* Equivalent Plastic Strain (for strain response only)
    All Shell elements:
    ATTA Value Stress/Strain Item
    101* von Mises both surfaces
    102* Major Principal both surfaces
    9 von Mises 1
    17 von Mises 2
    7 Major Principal 1
    15 Major Principal 2
    103* Minor Principal both surfaces
    8 Minor Principal 1
    16 Minor Principal 2
    104* Normal X both surfaces
    3 Normal X 1
    11 Normal X 2
    105* Normal Y both surfaces
    4 Normal Y 1
    12 Normal Y 2
    106* Shear XY both surfaces
    5 Shear XY 1
    13 Shear XY 2
    107* Equivalent Plastic Strain both surfaces
    108* Equivalent Plastic Strain 1
    109* Equivalent Plastic Strain 2
    Note: ATTA values marked with an asterisk (*) are not consistent with OptiStruct.