**Specifies the rotational velocity of the structure.**

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- Rotational velocity of the structure about the global Cartesian X, Y, and Z axes.

- Spin softening key:

- - 0 - No modification of stiffness matrix due to rotation.

- 1 - Decrease radial stiffness due to rotation (i.e., include spin
softening effects).

- Specifies the rotational velocity of the structure about each of the global
Cartesian axes (right-hand rule). Rotational velocities may be defined in
analysis types ANTYPE=STATIC, HARMIC (full), TRANS (full), and SUBSTR.
Rotational velocities are combined with the element mass matrices to form a
body force load vector term. Units are radians/time. Related commands are

- The

- The overall stiffness matrix should not be reused [

- This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Apply >Other >Angular Velocity

Main Menu >Preprocessor >Loads >Delete >Other >Angular Velocity

Main Menu >Solution >Apply >Other >Angular Velocity

Main Menu >Solution >Delete >Other >Angular Velocity

**Forms a set of optimization parameters by adding two sets.**

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- Number assigned to results set. If same as existing set, the existing values will
be overwritten by these results (defaults to next available set number).

- Number of first design set to be used in operation.

- Number of second design set to be used in operation (may be blank).

- Scale factor applied to

- Scale factor applied to

- Forms a result set of parameters by adding two existing design sets according to
the operation:

Main Menu >Design Opt >Combine

**Defines the analysis file to be used for optimization looping.**

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- File name (32 characters maximum).

- File name extension (8 characters maximum).

- Directory name (64 characters maximum).

**Notes**

- The optimization looping file must be specified for an optimization which is
performed interactively. The file must exist at the time

Main Menu >Design Opt >Assign

**Clears the optimization database.**

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- Clears the optimization database. All settings are reset to their default values,
and all design sets are deleted. This command is useful between multiple
(independent) optimization analyses in the same batch run or interactive session.

Main Menu >Design Opt >Clear & Reset

**Identifies the file where optimization data is to be saved.**

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- File name (32 characters maximum). Defaults to

- File name extension (8 characters maximum). Defaults to OPT if

- Directory name (64 characters maximum). Defaults to current directory.

**Notes**

- Identifies the file where optimization data is to be automatically saved during
looping. Automatic saves occur at the end of each loop or iteration, and upon
finishing out of the optimizer [

Main Menu >Design Opt >Controls

**Deletes optimization design sets.**

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- First design set in range to be deleted. Defaults to 0. If

- Last design set in range to be deleted. Defaults to

- Deletes the design sets in a specified range. All sets occurring within that range
(i.e.,

Main Menu >Design Opt >Select/Delete

**Controls curve fitting for the subproblem approximation method.**

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- Objective function curve fit:

- 0 - Quadratic plus cross-term curve fit for objective function
(default).

- 1 - Linear curve fit.

- 2 - Quadratic curve fit.

- 3 - Quadratic plus cross-term fit (same as 0).

- State variables curve fit:

- 0 - Quadratic curve fit for state variables (default).

- 1 - Linear curve fit.

- 2 - Quadratic curve fit (same as 0).

- 3 - Quadratic plus cross-term curve fit.

- Weighting factors:

- 0 - Weights applied to design sets based on triple products of
distance in design space, objective function values, and
feasibility/infeasibility (

- 1 - All weights set to unity.

- 2 - Weights based on distance in design space.

- 3 - Weights based on objective function values.

- 4 - Weights based on feasibility/infeasibility.

- Optimization printout:

- 0 - No printout of approximation data (default).

- Approximation reformulation:

- 0 - Approximations are updated every loop (default).

- Controls the curve fitting for the optimization approximations used with the
subproblem approximation method [

Main Menu >Design Opt >Method/Tool

**Specifies "Operation data" as the subsequent status topic.**

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- This is a status [

- If entered directly into the program, the

This command cannot be accessed directly in the menu.

**Initiates optimization looping.**

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- Initiates optimization looping using commands condensed from the analysis file
[

Main Menu >Design Opt >Run

**Defines the type of factorial evaluation to be performed.**

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- Type of factorial evaluation. Number of iterations is determined by the number of
design variables (

- FULL - Perform a full factorial analysis (default); 2**

- 1/2 - Perform a 1/2 fractional factorial analysis. (1/2)*2**

- 1/4 - Perform a 1/4 fractional factorial analysis. (1/4)*2**

- 1/8 - Perform a 1/8 fractional factorial analysis. (1/8)*2**

- 1/16 - Perform a 1/16 fractional factorial analysis. (1/16)*2**

- 1/32 - Perform a 1/32 fractional factorial analysis. (1/32)*2**

- 1/64 - Perform a 1/64 fractional factorial analysis. (1/64)*2**

**Notes**

- This command is valid for the factorial evaluation method of optimization [

Main Menu >Design Opt >Method/Tool

**Defines specifications for the first order optimization method.**

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- Maximum number of optimization iterations for the next execution [

- Limit (in percent) that is applied to the size of each line search step. For
example, setting

- The forward difference (in percent) applied to the design variable range that is
used to compute the gradient. For example, the shift in a DV is

**Notes**

- This command is valid for the first order method of optimization [

Main Menu >Design Opt >Method/Tool

**Specifies which design set will be used for gradient evaluation.**

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- BEST - Use the best design set as the evaluation point (default).

- LAST - Use the last design set as the evaluation point.

- The forward difference applied to the design variable range that is used to
compute the gradient. For example, the shift in a design variable (DV) is defined
as

**Notes**

- This command is valid for the gradient evaluation method of optimization [

Main Menu >Design Opt >Method/Tool

**Specifies whether to save the best-set results and database file.**

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- Save key:

- OFF - Do not save the results and database files for the best
design set (default).

- ON - Save results and database files (File.BRST and File.BDB)
for the best design set during optimization looping.

**Notes**

- Specifies whether or not the results file and database file corresponding to the
best design set (based on all existing sets) should be saved during optimization.
The saved files will be named File.BRST (or .BRTH for thermal analysis, .BRMG
for magnetic analysis, .BRFL for a FLOTRAN CFD analysis) and File.BDB. If

Main Menu >Design Opt >Controls

**Displays the results of a factorial evaluation.**

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- Parameter name. The parameter must have been previously defined as the
objective function or a state variable [

- Display effects for parameter

- MAIN - Display main effects (default).

- 2FAC - Display two-factor interactions.

- 3FAC - Display three-factor interactions.

- Minimum value of effect to be displayed. Default - computed minimum.

- Maximum value of effect to be displayed. Default - computed maximum.

- Displays the results of a factorial analysis in bar chart form. Only the 10 largest
interaction values will be displayed in the specified range (

Main Menu >Design Opt >Tool Results >Factorial

**Graphs the results of a gradient evaluation.**

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- Response parameter name. The parameter must have been previously defined
as the objective function or a state variable [

- Design variable names.

- This command is only valid after a gradient evaluation [

Main Menu >Design Opt >Tool Results >Gradient

**Displays the parameters for design sets.**

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- Display values of all analysis parameters from

- Listing key:

- 0 - List only scalar parameters related to optimization.

- 1 - List all analysis scalar parameters.

- Displays the values of the parameters for specified design sets. Note that a

Main Menu >Design Opt >List

**Specifies controls for optimization looping.**

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- Indicates where to begin reading the analysis file during optimization looping.
Note that the

- TOP - Read from the first line.

- PREP - Read from the first occurrence of

- Indicates how to treat parameters which have been designated as design
variables (DVs) during optimization looping. Defaults to previously specified
label, if any; otherwise, defaults to IGNORE:

- IGNORE - Do not process DV parameter assignments in the analysis
file during looping.

- PROCESS - Process DV parameter assignments in the analysis file
during looping.

- Indicates which types of parameters to save during optimization looping.
Defaults to previously specified label, if any; otherwise, defaults to SCALAR:

- SCALAR - Save scalar parameters only.

- ALL - Save all parameters, both scalar and array.

**Menu Paths**

Main Menu >Design Opt >Controls

**Graphs the results of a global sweep generation.**

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- Response parameter name. The parameter must have been previously defined
as the objective function or a state variable (

- Design variable names.

- This command is only valid after a global sweep generation [

Main Menu >Design Opt >Tool Results >Sweeps

**Creates a design set using active scalar parameter values.**

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- The next available design set number is assigned to the new design set.
Because no compression of set numbers is done, the next available set number
will be either 1 + the highest existing set number, or 1 + the highest set number
used (if sets with higher numbers previously existed but have been removed).
Multiple design sets can be created by repeated use of

Main Menu >Design Opt >Create

**Sets decision parameter for automatically increasing the time step interval.**

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- DOF label used to base a decision for increasing the time step (sub-step)
interval in a non-linear or transient analysis. The only DOF label currently
supported is TEMP.

- Two values used in algorithm for deciding if the time step interval can be
increased. The time step interval is increased if the maximum absolute value of
the incremental solution at the specified DOF label is less than VALUE for the
number of contiguous time steps specified by NUMSTEP. The default for VALUE
is 0.1 and the default for NUMSTEP is 3.

- This command is available only for nonlinear or transient analysis, and only when

Main Menu >Preprocessor >Loads >Nonlinear >Open Control

Main Menu >Solution >Nonlinear >Open Control

**Activates detailed optimization summary printout.**

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- Summary key:

- OFF - Do not print details (default).

- ON - Print the detailed summary.

- FULL - Same as

- Activates detailed optimization summary printout to the primary output during
optimization analysis.

Main Menu >Design Opt >Controls

**Defines the number of iterations for a random optimization.**

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- Maximum number of optimization iterations for the next execution [

- Desired total number of feasible design sets (including existing feasible sets).
Once

**Notes**

- This command is valid for the random design generation method of optimization
[

Main Menu >Design Opt >Method/Tool

**Reads optimization data into the optimization database.**

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- File name (32 characters maximum). Defaults to

- File name extension (8 characters maximum). Defaults to OPT if

- Directory name (64 characters maximum). Defaults to current directory.

- Reads optimization data from the specified file into the optimization database.
Optimization data must have been previously saved to this file [

Main Menu >Design Opt >Resume

**Prints the results of a factorial evaluation.**

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- Parameter name. The parameter must have been previously defined as the
objective function or a state variable [

- This command is only valid after a factorial evaluation [

Main Menu >Design Opt >Tool Results >Print

**Prints the results of a gradient evaluation.**

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- Parameter name. The parameter must have been previously defined as the
objective function or a state variable [

- This command is only valid after a gradient evaluation [

Main Menu >Design Opt >Tool Results >Print

**Prints the results of a global sweep generation.**

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- Parameter name. The parameter must have been previously defined as the
objective function or a state variable (

- This command is only valid after a global sweep generation [

Main Menu >Design Opt >Tool Results >Print

**Writes all optimization data to a file.**

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- File name (32 characters maximum). Defaults to

- File name extension (8 characters maximum). Defaults to

- Directory name (64 characters maximum). Defaults to current directory.

- Writes all optimization data to File.OPT or a named file. Saved data includes
optimization data only (DVs, SVs, saved design sets, analysis file name, etc.).
The data can be restored [

Main Menu >Design Opt >Save

**Selects design sets for subsequent optimization looping.**

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- Number of best design sets to be selected. If

- A number of best design sets or all feasible design sets may be specified.
("Best" design sets are determined by the objective function value for each
feasible design.) All design sets not selected are permanently removed from the
optimization database. The original set numbers are retained for remaining
design sets. Note that no compression of set numbers is done. Thus, if the
highest set is removed, the next available set will still be the previously used
highest set number + 1. (A maximum of 130 design sets can be stored in the
optimization database.)

Main Menu >Design Opt >Select/Delete

**Defines number of iterations for subproblem approximation method.**

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- Maximum number of optimization iterations for the next execution [

- Maximum number of consecutive infeasible design sets that are allowed. Once

**Notes**

- This command is valid for the subproblem approximation method of optimization
[

Main Menu >Design Opt >Method/Tool

**Specifies the reference point and number of evaluation points for a sweep
generation.**

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- BEST - Use the best design set as the reference point (default).

- LAST - Use the last design set as the reference point.

- N - Use design set number N as the reference point.

- Number of evaluation points used for each design variable sweep. Two to ten
evaluation points are allowed. Defaults to 2 (i.e., the minimum and maximum
design variable values).

**Notes**

- This command is valid for the sweep evaluation method of optimization [

Main Menu >Design Opt >Method/Tool

**Enters the design optimizer.**

SESSION:ProcessorEntry OPTIMIZATION:Specifications

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- Enters the ANSYS optimizer for design optimization by iterative analyses. Upon
issuing this command, if there are no existing design sets, all currently defined
numerical scalar parameters are established as design set number 1.

- This command is valid only at the Begin Level.

Main Menu >Design Opt

**Specifies the optimization method to be used.**

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- Name of the optimization method to be used:

- SUBP - Subproblem approximation method. Specifications for this
method are defined on the

- FIRST - First order optimization method. Specifications for this
method are defined on the

- RAND - Perform random iterations. Specifications for this method
are defined on the

- RUN - Perform a single optimization run with current parameter
values for the defined design variables.

- FACT - Perform factored design iterations. Specifications for this
method are defined on the

- GRAD - Compute a gradient (design sensitivity) at a point in design
space. Specifications for this method are defined on the

- SWEEP - Perform global sweeps through global design space starting
from a single design set. Specifications for this method are
defined on the

- USER - User-supplied external optimization. See the

**Notes**

- Specifies the optimization method to be used upon execution [

Main Menu >Design Opt >Method/Tool

**Defines specifications for user-supplied external optimization.**

Mp Me St -- -- -- -- -- -- PP --

- Maximum number of optimization iterations for the next execution [

- Numerical values (double precision) for user-supplied optimizer. Values may be
the results of parameter evaluations. Values are written to File.OPT after the
parameter set data.

**Notes**

- Defines the number of iterations and the parameter values for user-supplied
external optimization [

Main Menu >Design Opt >Method/Tool

**Specifies the parameters to be treated as optimization variables.**

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- Parameter name (must be a scalar parameter).

- Optimization variable type:

- DV - Design variable.

- SV - State variable, also referred to as a constrained variable.
(Usually defined via a

- OBJ - Objective function (variable to be minimized). Only one
objective function is allowed.

- DEL - Deletes this optimization variable (does not delete the
parameter). This option only has meaning if the parameter

- Minimum value for this parameter. For

- When the GUI is on, if a

- Maximum value for this parameter. Required for

- For

**Notes**

- Specifies the parameters to be treated as optimization variables. Variable
constraints (

Main Menu >Design Opt >Design Variables

Main Menu >Design Opt >Objective

Main Menu >Design Opt >State Variables

**Specifies "Output options" as the subsequent status topic.**

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- This is a status [

- If entered directly into the program, the

Utility Menu >List >Status >Solution >Output Options

**Controls the solution printout.**

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- Item for print control:

- BASIC - Basic quantities (nodal DOF solution, nodal reaction loads,
and element solution; includes participation factors for a
reduced modal analysis) (default).

- NSOL - Nodal DOF solution.

- RSOL - Nodal reaction loads.

- ESOL - Element solution.

- NLOAD - Element nodal loads.

- VENG - Element energies.

- ALL - All of the above solution items.

- Print solution for this item every

- Name of the component, created with the

**Notes**

- Controls the solution items to be printed, the frequency with which they are
printed (in static, transient, or full harmonic analyses), and the set of nodes or
elements to which this specification applies. An item is associated with either a
node (

- As described above,

- This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Output Ctrls >Solu Printout

Main Menu >Solution >Output Ctrls >Solu Printout

**Redirects text output to a file or to the screen.**

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- Filename (32 character maximum) to which text output will be redirected
(defaults to

- Filename extension (optional; 8 character maximum).

- Directory name (64 character maximum). Defaults to current directory.

- Location within a file to which output will be written:

- (blank) - Output is written starting at the top of the file (default).

- APPEND - Output is appended to the existing file.

**Notes**

- Text output includes responses to every command and GUI function, notes,
warnings, errors, and other informational messages. Upon execution of

- This command is valid in any processor.

Utility Menu >File >Switch Output to >File

Utility Menu >File >Switch Output to >Output Window

**Controls the solution data written to the database.**

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- Item for database and file write control:

- ALL - All solution items (default).

- BASIC - Write only NSOL, RSOL, NLOAD, STRS, FGRAD, and
FFLUX records to the results file and database.

- NSOL - Nodal DOF solution.

- RSOL - Nodal reaction loads.

- ESOL - Element solution (includes all of the following items).

- NLOAD - Element nodal loads and input constraint and force loads
(also used in conjunction with the

- STRS - Element nodal stresses.

- EPEL - Element elastic strains.

- EPTH - Element thermal, initial, and swelling strains.

- EPPL - Element plastic strains.

- EPCR - Element creep strains.

- FGRAD - Element nodal gradients.

- FFLUX - Element nodal fluxes.

- MISC - Element miscellaneous data (see the SMISC and NMISC
items of the

- If

- Name of the component, created with the

**Notes**

- Controls the solution items to be written to the database (and the reduced
displacement and results files), the frequency with which they are written (in
static, transient, or full harmonic analyses), and the set of elements or nodes to
which this specification applies. An item is associated with either a node (NSOL
and RSOL items) or an element (all of the remaining items). The specifications
are processed in the order that they are input. Up to 50 specifications (

- As described above, the program default for writing out solution data is to write
some or all items (depending on analysis type) for all elements. To restrict the
solution data that is written out, use

- The boundary conditions (constraints and force loads) are written to the results
file only if either nodal or reaction loads are written (NLOAD or RSOL items).

- If you use an array of time values (

- This command is also valid in PREP7.

Main Menu >Preprocessor >Loads >Output Ctrls >DB/Results File

Main Menu >Solution >Output Ctrls >DB/Results File