introduction to ansys designxplorer -...

© 2013 ANSYS, Inc. September 27, 2013 1 Release 14.5

14. 5 Release

Introduction to ANSYS DesignXplorer

Overview


• DesignXplorer (DX) is a tool that uses response surfaces and direct optimization to efficiently explore the solution space. – Explore and understand the performance at other design or operating conditions

– Find the conditions which give the best performance

– Determine the key parameters influencing the design

– Explore the robustness of the design

Single Point What If? Response Surface

?

? ?

What is DesignXplorer?


DX Features List of DX Features (discussed on following slides and lectures)

– ‘What if’ Study [does not require a DX license]

– Parameter Correlation

– Design of Experiments

– Response Surface

– Min/max search

– Surface/XY plots

– Sensitivities

– Direct and response surface Optimization and trade-off plots

– Robustness of design

– Six Sigma Robustness Evaluation


DX Features What if’ Study

Automatically run through a list of manually specified design points [does not require a DX license]


DX Features Parameter Correlation

1. Identify unimportant parameters

Output Parameter

Input Parameter

Output parameters not sensitive

to force variations


DX Features Parameter Correlation

2. Identify the degree to which the relationship is linear/quadratic


DX Features Design of Experiments

• Specify the DOE Type

• Specify the range for each parameter

• DX uses a DOE to select design points with parameter combinations intended to explore the solution space efficiently

– works best for fewer than 20 parameters


DX Features Response Surface

• A continuous response surface is formed from the DPs

– Various formulations available

• A response surface can be quickly explored by other DX features …

Parameter 1

Curve fit

response Design

Points


DX Features Response Surface

–Min/max search

– Surface/XY plots

– Sensitivities;

–Optimization and trade-off plots

–Robustness of design


DX Features Six Sigma Robustness Evaluation

Input parameters vary!

Output parameters

Understand how

your performance

will vary with your

design tolerances

Determine how

many parts will

likely fail

Understand

which inputs

require the

greatest control


DX Small effort/cost, huge benefits.

Understanding Innovation ROI


14. 5 Release

Introduction to ANSYS DesignXplorer

Interface


General Workflow


• Workbench Applications that allow for parameterization: – External CAD package

– Engineering data

– DesignModeler

– Meshing

– Mechanical

– Mechanical APDL

– ExplicitSTR

– CFX

– Fluent

– CFD-Post

– VistaTF

– Polyflow

– SpaceClaim

– External Connections

– Excel

– AQWA

– nCode

– Ansoft Solutions (HFSS, Maxwell)

Parameters


• In Workbench Options > Geometry Import, enable Parameters and

specify a filtering prefix and suffix

• The default filterer is “DS”. • Example:

– To expose a CAD parameter named “Length” in Workbench, it could be renamed as

“dslength”, Lengthds”, “ds_Length”, “Length_ds”, etc. (the order is arbitrary as is

the underscore and the case).

–Leaving the filter blank will cause all CAD parameters to be passed to

Workbench.

Parameters Parameterizing CAD dimensions


Input parameter created from an

expression in ANSYS CFX

Output parameters created from

an expression in ANSYS CFD

Post

Parameter definition

based on ANSYS

Mechanical APDL

input files

Input parameter created from an

expression in ANSYS FLUENT

Input and output parameters created in CAD,

DM, AMP, Mechanical

Parameters Parameterizing WB dimensions, BCs, etc.


Parameters Derived Parameters

• Derived Parameters: – Parameters created using analytical expressions composed of input and output parameters.

– Derived parameters can be defined using various built in arithmetic, trigonometric and statistical functions.

– Examples include (but are not limited to):

• cost function (i.e., the product of mass and cost per mass)

• normalized stress (i.e., stress response divided by an applied stress)

• Mesh sizing (setting a mesh parameter as a function of a geometric parameter)


All input and output parameters

Properties of

selected parameter

Table of Design Points [discussed on following slides]

Charts [discussed on following slides]

Chart options

Create derived

Parameter

Parameter Set


Update All Design Points

RMB > Update Selected Design Points

Parameter settings

currently loaded in

applications

Select Export to retain

files associated with the

Design Point

Status bar gives more info

about design points update.

Parameter Set Table of Design Points (“What-If” Study)


• Parameters Charts allow users to

configure and plot Input vs. Output

in XY plots.

• Show how output parameters vary for

design point combinations.

BA

D

GO

OD

Pre

ssu

re D

rop

Flo

w U

nif

orm

ity

Go

od

Bad

• show the chart output

vs. input parameter.

Parameter Set Charts


1

2

3

DX layout is very similar to Parameter Set

DX Parameter Correlation


Charts

1

2

3

DX Design of Experiments


DX Response Surface

1

2

3


DX Response Surface Optimization

1

2

3

4


• A Direct Optimization system is a single-component system that utilizes real solves.

• Is not dependent on the quality of a response surface.

• Retrieve information via data links from other components that contain design point data, thus reducing the time needed for the optimization without altering the original source of the design points.

• To add a Direct Optimization system to your project, drag it from the Design Exploration section of the Workbench Toolbox and drop it on your Project Schematic.

DX Direct Optimization


1

2

3

DX Six Sigma Analysis


Unified Reporting

• DX Systems contribute to the unified report

• Includes all DX tables and Charts


• View > Reset Window Layout

– The window types are connected between the various Workbench Native applications. If you close the chart on one, it is closed on the others. Use View > Reset window Layout if you get stuck

Reset Windows Layout


Summary

• DX provides plenty of functionality to allow you to gain a deeper understanding of your problem

• Each tool within DX has a user interface that follows a common methodical workflow


Workshop 1

Excel will receive two inputs from Workbench (must be between 0 and 100) and calculate the value of two output parameters according to the following equations:

• Out_1 = -2*(in_1/100-0.5)^3+SIN(2*PI()*in_2/100)

• Out_2 = (in_1/100-0.5)^2+(in_2/100-0.5)^2

Plotting Out_1 in Excel produce the following charts. Notice that the maximum value of out_1 occurs at approximately (in_1,in_2)=(0, 25)

0

10

20

30

40

50

60

70

80

90

100

0

10

20

30

40

50

60

70

80

90

10

0

Inp

ut

2

Input 1

Output 1

1-1.5

0.5-1

0-0.5

-0.5-0

-1--0.5

-1.5--1

0

34

68

-1.5

-1

-0.5

0

0.5

1

1.5

0

13

26

39

52

65

78

91

Input 1

Output 1

1-1.5

0.5-1

0-0.5

-0.5-0

-1--0.5

-1.5--1


Workshop 1

Plotting Out_2 in Excel produce the following charts. Notice that the maximum value of out_2 occurs at approximately (in_1,in_2)=(50, 50)

Since there is no set of input parameters that delivers the maximum values of both out_1 and out_2, a tradeoff analysis will need to be conducted when finding the optimal conditions

0

9

18

27

36

45

54

63

72

81

90

99

0

11

22

33

44

55

66

77

88

99

Inp

ut

2

Input 1

Output 2

0.4-0.5

0.3-0.4

0.2-0.3

0.1-0.2

0-0.1

0

34

68

0

0.1

0.2

0.3

0.4

0.5

0

12

24

36

48

60

72

84

96

Input 1

Output 2

0.4-0.5

0.3-0.4

0.2-0.3

0.1-0.2

0-0.1

introduction to ansys designxplorer -...

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