Unexpected results of TLine1?

Questions
, , ,
1

I am trying to solve the following question and replicate the waveform through modelica from Mathematica. OLine does work but TLine1 does not.

TLine1_Oline.PNG.jpg
TLine1_Oline.PNG.jpg888×1361 130 KB

Open in Wolfram Cloud ↗

TLine1 uses the distributed parameter model that can accurately represent the behavior of the transmission line over a wide frequency range. Whereas, OLine breaks down the transmission line into a finite number of sections.

My expectation is TLine1 to behave in similar manner as OLine without oscillations. As shown above, I don’t see that behavior from TLine1.
I checked the same in Dymola and could see proper waveform.
Is this a bug?

2

Thank you, this is very helpful feedback. We have created a story to investigate this simulation kernel bug and added you as external reporter.

3

Hi @Sergio Vargas ,
Could you please let me know if the fix would be available in the next release?

4

I am sorry, but although some progress has been made on pinpointing the underlying issue, we have not been able to prioritize fixing it for the upcoming release.

5

The issue was fixed some time ago by a reworked implementation of the delay operator. The fix will be included in the next release. Thanks for the report!