HyperStudy Fails to Import Variables from Twin Activate Tutorial Model — “Failed to generate import

RyanT229

I’m encountering an error when trying to link Twin Activate and HyperStudy using the PID Optimization tutorial model that comes with Altair Twin Activate.

When I create a new study in HyperStudy 2025.1, select Twin Activate as the model type, and point to the provided .scm file, the variable import process fails immediately with the following messages:

Error: Twin Activate failed to generate import hstp file (C:/Users/.../Model1.ta2hst)
Error: Failed to import variables of model (Twin Activate 1 (m_1))

No .log file is generated in the run directory—only the partial .ta2hst path is shown. The Twin Activate model itself runs fine outside of HyperStudy.

I have already verified that:

• All parameters are valid scalar variables defined in the model (Kp, Ki, Kd, etc.).
• The tutorial model runs successfully in Twin Activate.
• File paths are short and contain no special characters.
• Both Twin Activate and HyperStudy are version 2025.1, licensed and installed correctly.

I have also tried moving the study to C:\HST\ and testing other Twin Activate tutorial models, but the same issue occurs.

Could this be a known issue with the Twin Activate ↔ HyperStudy connector for .scm models?
If so, are there updated steps or patches to enable variable import (for example, defining parameters in the initialization script or using ToCSV outputs)?

Any guidance or workaround would be greatly appreciated.

Product/Topic Name:

Altair Twin Activate 2025.1 and HyperStudy 2025.1

 

GTT Adam

Hi @RyanT229,

I do not see a tutorial with the name of PID Optimization in the Help Documentation for 2025.1.

Is the tutorial that you mention titled "Optimizing a Controller with HyperStudy"?

It should be noted that you may need to Register the Solver Script for Twin Activate before launching the Study. Go to Edit » Register Solver Script and then set the location of the Activate_batch.bat file like so:

I copied the SCM and HSTUDY file from the demo directory to a new directory on my desktop. I opened the HSTUDY file in HyperStudy, registered the solver script, and then ensured the Resource and Solver Execution Script were set as in the tutorial:

I was then able to launch the optimization without any issues.

Therefore, there does not appear to be any issue at all with the Twin Activate / HyperStudy connector

Hope this helps!

Adam Reid