Transcript optiSLang - ANSYS Workbench Interface (optiPlug)

optiSLang - ANSYS Workbench
Interface (optiPlug)
A brief introduction
Dipl.-Ing. (FH) Andreas Veiz
Benefits of optiPlug
• Export your Project directly from ANSYS Workbench
• Easy selection of the input and output parameters –
just „click and go“
• Pre-defined problem files and start script
• Possibility to import selected designs to verify the results
Selecting your cad parameters
• Load your CAD geometry (e.g. in ANSYS Design Modeler)
• Highlight the desired parameters with a „D“ to add them to the
parameter manager.
• You can change the parameter values now easily
Verifying the parameters
Values
Allocation
• Verify the values of the selected parameters
• Verify the correct allocation of the parameter names to the values
• You have selected your geometry parameters of the
CAD model.
• Now start a new Workbench simulation
• Define the analysis
Selecting your parameters in Workbench
• Highlight the desired
output parameters
with a „P“ to add
them to the
parameter manager
Overview input and output parameters
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Open the ANSYS Workbench Parameter Manager
You have now an overview of your inputs and outputs
Make sure that every desired parameter is selected properly
Save the simulation and the project before using the interface
Using the optiPlug interface
• Click on the optiPlug – write button to start the plug in
Settings of the interface
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Define the working directory for optiSLang
Define the project name
Set your default parameter range
Select whether the project should be stochastic oder optimization
Click on Start to export your project now
Directory
Project name
Problem type
Parameter range
Importing your project in optiSLang
• Close the Workbench simulation and project
• Open optiSLang
• Import the pre-defined project
• Start the
project
manager
• Select
„Import“
• Browse for
the project
• Select the
project file
(*.fgpr)
Parametrize the problem
• Start the modification of the pre-defined parameters
Modifying the parametrization
• Fill in the correct bounds for the analysis (ovierview on sheet 13)
Overview: upper and lower bounds
Parameter name
value
range
Flanschbreite_E6_1_DS
Rohrstaerke_E6_2_DS
Einflusstiefe_E6_3_DS
Einflusstiefe2_E6_4_DS
Flanschstaerke_E6_5_DS
Flanschstaerke2_E6_6_DS
Verrundungsbreite_E6_7_DS
Verrundungsbreite2_E6_8_DS
Schraubendurchmesser_E13_9_DS
Schraubenspalt_E13_10_DS
Schraubenkopfueberstand_E13_11_DS
Schraubenlage_E13_12_DS
Schraubenkopfstaerke_EX29_13_DS
Schraubenkopfstaerke_EX32_14_DS
50
20
150
150
20
20
10
10
12
2
10
100
12
12
45-150
1-50
140-250
140-250
10-30
10-30
5-20
5-20
6-24
0.1-3
2-10
65-250
4-24
4-24
Defining the dependent parameters
• Remove Verrundungsradius_E6_15_DS and
Verrundungsradius2_E6_16_DS from the parameter tree
• Mark the value and define a new dependent parameter.
• Insert „Verrundungsbreite_E6_7_DS*sqrt(2)“ for Verrundungsradius
and „Verrundungsbreite2_E6_8_DS*sqrt(2)“ for Verrundungsradius2
Creating input constraints
• Due to the geometry it is necessary to define four input
constraints that limit the variation space of the parameters
corresponding to the different geometries
• Define the four constraints in the constraint section
Creating input constraints
The input constraints:
1. Flanschbreite_min (minimum of the flange width)
0 <= Flanschbreite_E6_1_DS-Schraubendurchmesser_E13_9_DS2*Schraubenkopfueberstand_E13_11_DSfmax(Verrundungsbreite_E6_7_DS,Verrundungsbreite2_E6_8_DS)1-1
2. Schraubenlage_min (minimum of the bearing of the screw)
0 <= Schraubenlage_E13_12_DSSchraubendurchmesser_E13_9_DS/2Schraubenkopfueberstand_E13_11_DSfmax(Verrundungsbreite_E6_7_DS,Verrundungsbreite2_E6_8_DS)Rohrstaerke_E6_2_DS-50-1
3. Schraubenlage_max (maximum of the bearing of the screw)
0 <= Rohrstaerke_E6_2_DS+Flanschbreite_E6_1_DSSchraubenlage_E13_12_DS-Schraubendurchmesser_E13_9_DS/2Schraubenkopfueberstand_E13_11_DS+50-1
4. Schraubenspalt_max (maximum of the gap of the screw)
0 <= Schraubenkopfueberstand_E13_11_DSSchraubenspalt_E13_10_DS-0.2
Starting the Design of Experiments
• Save and exit the parametrization
• Start the Design of Experiments flow. You see that the starting
script and the problem file is already selected it is pre defined by
the plug in
• Choose Latin Hypercube Sampling and insert a Sample Size of 450.
Because of the input constraints will be about 110 samples be valid.
• Chose the valid sample
points by deleting the
invalid (click on Delete)
• Click OK and start
the DoE to solve the
designs
Result and Postprocessing I
• See that we have bad results in two areas
• 1st: the displacement of Flansch 1 cannot be negative
• We have to remove these bad designs
Deactivating unsuitable designs I
• Draw a window around the
designs you want to deactivate
• Deactivate them by mark them
as deactivate (context menu by
clicking the right mouse button)
• See the reduced design space
Deactivating unsuitable designs II
• Watch for other areas of bad results
• Repeat deactivating Designs in
these cases. You find the other
area of bad designs when you look
at the equivalent stress.
• Save your modified result file
to start a new postprocessing.
Postprocessing the reduced bin file
• Take the reduced model to search for dominating parameters of
the desired target values.
• The target values for the optimization are:
- Equivalent stress in the screw
- Displacement of Flansch 1 and 2
Coefficients of determination
• Look at the Coefficients of
determination of the target
values.
• Check for double Parameters
to reduce the model.
• Dominating Parameter:
Rohrstaerke_E6_2_DS
Reducing the model
• You can reduce the parameters to 6 parameters by
ignoring the parameters with a weak influence.
• The remaining parameters are:
• Rohrstaerke_E6_2_DS
• Schraubenlage_E13_12_DS
• Schraubenkopfstaerke_EX_32_14
• Einflusstiefe_E6_3
• Einflusstiefe2_E6_4
• Schraubendurchmesser_E13_9_DS
• Now you can reduce the parameter set in a new parametrization!
• Be aware, that you have to modifiy the geometry constraints in
an accurate way!
Modifying the problem file
• Set the unnecessary parameters as „inactive“
• Check the constraints, modify them as shown below:
• Constraint 1: 18-Schraubendurchmesser_E13_9_DS
• Constraint 2: 0 <= Schraubenlage_E13_12_DSSchraubendurchmesser_E13_9_DS/2-Rohrstaerke_E6_2_DS71
• Constraint 3: 0 <= Rohrstaerke_E6_2_DSSchraubenlage_E13_12_DSSchraubendurchmesser_E13_9_DS/2+89
• Constraint 4: remove
Adding the objective function
• Start the parametrization again and add the objective function
• Our aim is to minimize the displacement of the two flanges and
minimize the equivalent stress in the screw
• Insert the objective as shown below
• fabs(value) provides the absolute value
Starting an optimization
• Because of the input constraints you can only use the GA or EA
algorithm for the optimization.
• Define the optimization run. This is not pre-defined, so that you
have to fill in the correct problem definition and starting script.
• Set 0% to avoid the violation of input constraints.
• Modify the settings for the population size (25) and the mutation
rate (0.2) as shown below and start the solver.
Result monitoring and postprocessing
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Best Design in this run is design Nr. 177
Reducing of the maximum equivalent stress by about 66%
The Gap could not be reduced yet
Comparing of the designs
• Basic Design:
Displacement: 0.054867 mm
Max. Stress in Screw: 55.239 MPa
• Optimized Design:
Displacement: 0.072812
Max. Stress in Screw: 18.5926 MPa
Import a design in Workbench
• Re-open the Workbench Simulation
• Browse for the design you want to import
• Highlight „Calculate this design“ if you want to check the results
Calculated, imported design
• See the changed parameters and results