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OptiSLang - ANSYS Workbench Interface (optiPlug) A brief introduction Dipl.-Ing. (FH) Andreas Veiz.

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Presentation on theme: "OptiSLang - ANSYS Workbench Interface (optiPlug) A brief introduction Dipl.-Ing. (FH) Andreas Veiz."— Presentation transcript:

1 optiSLang - ANSYS Workbench Interface (optiPlug) A brief introduction Dipl.-Ing. (FH) Andreas Veiz

2 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

3 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

4 Verifying the parameters Verify the values of the selected parameters Verify the correct allocation of the parameter names to the values Values Allocation

5 You have selected your geometry parameters of the CAD model. Now start a new Workbench simulation Define the analysis

6 Selecting your parameters in Workbench Highlight the desired output parameters with a „P“ to add them to the parameter manager

7 Overview input and output parameters 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

8 Using the optiPlug interface Click on the optiPlug – write button to start the plug in

9 Settings of the interface 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

10 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)

11 Parametrize the problem Start the modification of the pre-defined parameters

12 Modifying the parametrization Fill in the correct bounds for the analysis (ovierview on sheet 13)

13 Overview: upper and lower bounds Parameter namevaluerange 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

14 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

15 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

16 Creating input constraints The input constraints: 1. Flanschbreite_min (minimum of the flange width) 0 <= Flanschbreite_E6_1_DS-Schraubendurchmesser_E13_9_DS- 2*Schraubenkopfueberstand_E13_11_DS- fmax(Verrundungsbreite_E6_7_DS,Verrundungsbreite2_E6_8_DS) Schraubenlage_min (minimum of the bearing of the screw) 0 <= Schraubenlage_E13_12_DS- Schraubendurchmesser_E13_9_DS/2- Schraubenkopfueberstand_E13_11_DS- fmax(Verrundungsbreite_E6_7_DS,Verrundungsbreite2_E6_8_DS)- Rohrstaerke_E6_2_DS Schraubenlage_max (maximum of the bearing of the screw) 0 <= Rohrstaerke_E6_2_DS+Flanschbreite_E6_1_DS- Schraubenlage_E13_12_DS-Schraubendurchmesser_E13_9_DS/2- Schraubenkopfueberstand_E13_11_DS Schraubenspalt_max (maximum of the gap of the screw) 0 <= Schraubenkopfueberstand_E13_11_DS- Schraubenspalt_E13_10_DS-0.2

17 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

18 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

19 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

20 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.

21 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

22 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

23 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!

24 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_DS- Schraubendurchmesser_E13_9_DS/2-Rohrstaerke_E6_2_DS- 71 Constraint 3: 0 <= Rohrstaerke_E6_2_DS- Schraubenlage_E13_12_DS- Schraubendurchmesser_E13_9_DS/2+89 Constraint 4: remove

25 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

26 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.

27 Result monitoring and postprocessing 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

28 Comparing of the designs Basic Design: Displacement: mm Max. Stress in Screw: MPa Optimized Design: Displacement: Max. Stress in Screw: MPa

29 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

30 Calculated, imported design See the changed parameters and results


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