tTool QSA Batch Tests

QSA Batch Tester V0.28 - BT44B Front.ods

About:

The QSA (tTool) Batch Tester, is a spreadsheet that aids in generating custom QSA (Quasi-Static Analysis) tests for tTool.

They're typically used to test for some specific tyre properties, such as shape, stiffness, growth or contact patch pressure distribution.

Quick Guide / Procedure:

1) You'll want to fill the data in this sheet (“Input”). This is important as it helps pre-fill other sheets with applicable data.

2) Proceed to “0_PreTest”, this should now be preloaded with some minor tests to help ascertain certain values required to create more relevant tests in “1_QSATest”, where the most important tests begin.

In other words, it will slightly improve the test results obtained from 1_QSATest. The pretests should only take ~1 minute or so depending on the complexity of your tyre, so it’s well worth it.

Create the file by pressing the ‘Generate PreTest’ button above. Then load the file in tTool. Alternatively hit the ‘Copy!’ button ‘0_PreTest’ and paste the into your ../pTool/qsa_custom.ini file (create one if it doesn't exist).

3) 1_QSA Test is where you may define your test conditions for the quasi-static model. These again, should be pre-filled with sensible numbers from this (Input) sheet.

What you want to measure (radius or stiffness, etc) is up to you. The predefined tests are set essentially, as an automated way of determining appropriate lateral and longitudinal patch stiffness’s (for [Realtime] parameters)

If testing something else, there are example sheets starting with 2_ for tests you might run. You may also add more by copying the ‘1_QSATest’ sheet, alternatively you could simply create multiple .ods files to achieve the same basic thing.

One such test suggestion might 'free rolling' radii with different rotation speeds. Such as 7_QSARollingRadius.

4) Run these batch tests within tTool. Contact patch tests, such as these, are very slow to process and may take several hours, depending on hardware and complexity of the tests you are planning to run.

5) The standard tests are to help you obtain accurate lateral and longitudinal stiffness values for the bristles (under the realtime section).

These results are generated in TGM-Output. They may take some hours to compute through tTool. If you're running your own custom tests, the numbers output in ‘AnalysisGraphs’ will likely be useless and as such, you’ll probably have to perform your own analysis on them.

For exporting / comparing a tyre shape to a cross section in the TGM Generator spreadsheet, preferably use the 4th entry of the PreTest results (Filename would be CustomQSAGeometry003.txt, in the sub-folder of your tyre).