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BETA CAE Systems S.A. Tutorial 7 - 1 ETA Tutorials

Tutorial 7

ETA2d Plot

Table of Contents

1. Introduction ............................................................................................................... 21.1. Prerequisites .............................................................................................. 21.2. Problem Description ................................................................................... 21.3. Data Files ................................................................................................... 2

2. Plot curves from Model Entities ............................................................................... 32.1. Read Model Geometry ............................................................................... 32.2. Plot Results from one Node........................................................................ 32.3. Plot results from more Nodes ..................................................................... 42.4. Synchronization with Model ........................................................................ 5

3. Plot curves from Time History files .......................................................................... 63.1. Read Curves .............................................................................................. 63.2. Modify Units ................................................................................................ 73.3. Add curves ................................................................................................. 73.4. Multiple Plots .............................................................................................. 8

4. Identification ............................................................................................................ 104.1. Identify a Point .......................................................................................... 104.2. Annotation on Curve ................................................................................. 114.3. Exhibit Curves .......................................................................................... 12

5. Filter Curves ............................................................................................................ 145.1. CFC Filter ................................................................................................. 146. Curves Data ............................................................................................................ 166.1. Copy curves data..................................................................................... 166.2. Save data in ASCII file ............................................................................. 17

7. Conclusion ............................................................................................................... 18

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1. Introduction

This tutorial highlights some of the most commonly used ETA features related to the 2d Plot tool.

Not all capabilities are demonstrated in this tutorial. The user may also refer to ETA Users Guide for the

functionality ofETA and detailed description of functions and procedures.

1.1. Prerequisites

It is recommended for users who have never used ETA before to read the Introduction Tutorial. For old

ETA users it would be helpful referring to ETA Release Notes.

1.2. Problem Description

The purpose of this tutorial is to exploit the mainfunctions of the 3d Plot tool through a crash analysisexample.

1.3. Data Files

The files required for this tutorial are:

/tutorials/mETA_tutorials/02-CRASH_BASIC/double_rail.pc

/tutorials/mETA_tutorials/02-CRASH_BASIC/double_rail.DSY

/tutorials/mETA_tutorials/02-CRASH_BASIC/double_rail.THP

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2. Plot curves from Model Entities

2.1. Read Model Geometry

1. Switch to the Read Results > Geometry taband press the button to open the File Manager.

For this tutorial select the file:

../02-CRASH_BASIC/double_rail.pc

and press Open.

2. Switch to the Results tab. The respective

results file and all states are selectedautomatically.

3. Keep checked only the Deformation option andpress Read.

2.2. Plot Results from one Node

1. Select iHistory > Node X Data under theIdentify function.

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2. Pick a node from the model.

A curve is created in a 2d Plot window namedIdeHistory1.

3. Use the ESC key to exit the function.

2.3. Plot results from more Nodes

1. Return to MetaPost window and through the

Identify function select iHistory > From ModelEntities.

The From Model Entities window opens and themouse pointer changes into picking mode.

2. Select three more nodes from the model andmiddle click to exit the picking function.

3. Select these nodes from the list.

4. Select X Node Data(Displacements) from theAvailable Results list.

5. Change the x axis to Time.

6. Select the IdeHistory window.

7. Click on the Create button.

TipsNodes previously identified can be inserted in thelist by clicking on the refresh button.By selecting any type of entity from the drop downmenu the mouse pointer changes into picking modeautomatically.

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2.4. Synchronization with Model

The curves are added in the same plot aspreviously.

1.Animate the model. Notice that the currentYvalue is synchronized and shown on the plot.

To deactivate the synchronization follow the stepsbellow:

2. Select all curves from the list and open thecontext menu with the right mouse button andselect Curve Options.

3. Select the Synchronize category.

4. Change the Synchronize with Model to None.

5. Use the ESC key to close the window.

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3. Plot curves from Time History files

3.1. Read Curves

1. Switch to the Curves tab of the Read Resultscard.

2. Invoke the file manager and open the file:

../02-CRASH_BASIC/double_rail.THP

3. Select global as Type and Time as Abcissa.

4. Select the Total Kinetic and Total InternalEnergy from the list.

5. Configure to create a New Window and click onthe Read button.

6. The default title of the plot is the filename.Double click on it to open the Header Options andchange the text to ENERGIES

7. Press ESC or the X button to close the optionswindow.

TipsNotice that curves loaded from the Time History fileare also synchronized with the model.

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3.2. Modify Units

1. Select the two curves from the list.

2. Invoke the context menu and select ModifyUnits.

3. SelectY-Axis on the top, Energy from the listand configure to convert the units fromjoules tokilojoules.

4. Click on Replace button.

The curves are replaced with new ones.

5. Invoke the context menu by right clicking on theplot and select Edit > Show Legend.

Tips

The legend can be moved by drag and drop withthe middle mouse button.

3.3. Add curves

1. Select the two curves from the list.

2. Invoke the context menu and selectCalculations > Add.

A third curve is created named Sum of: 1-2.

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3.4. Multiple Plots

It is possible to have more than one 2d Plots underthe same window.

1. Invoke the context menu by right clicking on theplot.

2. Select Edit > Layouts and select the 2x2layout.

Tips

Now, there are four plots under the same window.These plots are also listed in the Curve List.

By clicking on a plot, it becomes active andhighlighted. Any new curves will be created on theactive plot.

Use the CTRL button to activate more than oneplot.

Active plots can also be controlled through theCurveList, Select plots with the left mouse buttonto make them active. Using the CTRL button theplots can be deactivated.

3.Activate only the plot 2:Plot.

4. From the ReadResults card select the TimeStep.

5. Set to Active Window and press the Readbutton.

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Active Plot

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The curve is created on the second plot.

1. Modify the header to TIME STEP and changethe units to msec.

TipsThe curves ids are numbered by window and not

by plot. In this case the curve takes the number 4.

2. Open the context menu within the second plotand change the layout back to 1x1 through Edit >Layouts.

Only Plot 2 is now visible in the window as well asin the Curve List.

TipsAll curves present in other plots are not lost. Theycan become again visible by changing the layout.

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4. Identification

4.1. Identify a Point

1. Hold the CTRL button and make a box selection

on the area as shown in the picture.

The area is zoomed.

2. Middle click on the point just before the drop ofthe curve to identify it.

Tips

Identification functions are also available throughthe Identify button or through the respective field ofthe context menu.

3. Press the F9 button to fit again the curve to theplot.

4. Double click on the curve to open Curve

Options.

5. Select the Points and configure the Precision toFixed and Digits to 2.

6. Reset the identification using the respectivebutton.

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4.2. Annotation on Curve

1. Invoke the annotations tool.

2. Select Window 2 from the list.

3. Select Curve under the Pointertab.

4. Set the Position to Curve Min and click on thePick button to select the Time Step curve (id:4).

An Annotation is created pointing on the minimumY value.

TIPS:The annotation can be moved by drag and drop

using the middle mouse button.

The text precision and contents can be modifiedunder the Text tab of the annotations card.

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4.3. Exhibit Curves

1. Select plink under the Results of the Curvescard.

2. Select everything from the list.

3. Select Normal force.

4. Set New Window and click on the Read

button.

A new 2d Plot Window is created.

5. Select Curve Functions through the contextmenu.

6. Select the Exhibit function.

7. Configure to Exhibit curves above: 0.75.

8. Click on Select and after on Orbutton.

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Only the curves that pass the 0.75 limit are visibleand selected

1. Right click on the selected curves to invoke thecontext menu.

2. Select Statistics > Max.

The max value of each curve is identified.

3. Invoke again the context menu for the selectedcurves and select Show on Model.

4. Switch to the MetaPost Window. The

respective plinks are identified in the 3d Window.

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5. Filter Curves

5.1. CFC Filter

1. Change the Type to section.

2. Select Section 1.

3. Select Section X force.

4. Switch to New Window and press the

Read button.

5. Right click on the curve, either from thelist or directly on the plot.

6. Select Filter > Unit System.

7. Select MM.K.MS and click on the OKbutton.

8. Within the context menu select Filter >CFC > Frequency channel Class 180.

9. Press on the Apply button.

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TipsThe Apply button creates a new curve.By usingthe Replace button, the old curve is deleted.

It is also possible to setup the units and filteringmethod before reading curves through the

Settings tab of the Read Curves card.

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6. Curves Data

6.1. Copy curves data

1. Select only the filtered curve and invoke the

context menu.

2. Select Clipboard > Copy selected curvesdata.

3. Invoke the SpreadSheet Editorfrom theTools menu on top.

4. Paste the data in the editor.

TipsThe data can be pasted in any other softwaretoo.

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6.2. Save data in ASCII file

1. Invoke the File Managerfrom the File > Save menu.

2. Change the File Type to Curves in column format.

3. Type a filename and its extension and click on the Save button.

4. Press the ESC key to close the card.

TipsThe card remains open in case that more curves need to be saved.

Activate the Save range option to save only a part of the curve.

To append data in an existing file, use the append option.

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7. Conclusion

In this tutorial some of the basic steps for post processing curves data have been followed. Not all

capabilities were demonstrated. The user may also refer to ETA Users Guide for the functionality ofETAand detailed description of functions and procedures.

Documents

07-2D_PLOT