introduction to ansys designxplorer -...
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© 2013 ANSYS, Inc. September 27, 2013 1 Release 14.5
14. 5 Release
Introduction to ANSYS DesignXplorer
Overview
© 2013 ANSYS, Inc. September 27, 2013 2 Release 14.5
• 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?
© 2013 ANSYS, Inc. September 27, 2013 3 Release 14.5
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
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DX Features What if’ Study
Automatically run through a list of manually specified design points [does not require a DX license]
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DX Features Parameter Correlation
1. Identify unimportant parameters
Output Parameter
Input Parameter
Output parameters not sensitive
to force variations
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DX Features Parameter Correlation
2. Identify the degree to which the relationship is linear/quadratic
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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
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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
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DX Features Response Surface
–Min/max search
– Surface/XY plots
– Sensitivities;
–Optimization and trade-off plots
–Robustness of design
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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
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DX Small effort/cost, huge benefits.
Understanding Innovation ROI
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14. 5 Release
Introduction to ANSYS DesignXplorer
Interface
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General Workflow
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• 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
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• 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
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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.
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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)
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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
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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)
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• 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
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2
3
DX layout is very similar to Parameter Set
DX Parameter Correlation
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Charts
1
2
3
DX Design of Experiments
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DX Response Surface
1
2
3
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DX Response Surface Optimization
1
2
3
4
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• 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
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2
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DX Six Sigma Analysis
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Unified Reporting
• DX Systems contribute to the unified report
• Includes all DX tables and Charts
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• 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
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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
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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
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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