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  1. Community Forums
  2. Adams Car
  3. Anyone tested the RealTime Solver with their own models...

Following Cadence Design Systems’ acquisition of the Design & Engineering (D&E) business, the D&E Community Forum on the Nexus Community Center has been migrated in the Cadence Physical System Simulation Community. For more details and if you have any questions, please refer to the FAQ.

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Anyone tested the RealTime Solver with their own models in A/Car ?

MK202610123211
MK202610123211 over 9 years ago
I had the crazy idea to use the RT Solver to speed up a set of analysis (using FTire and dtout=1e-3 s)
So I tested the MSC Demo vehicle for one typical case and found the benchmark time was 2:05 min for everything on default settings.
 
Then after a week of hazzle with updating the license file I finally tried with different settings for FIXIT and HRATIO.
After some experiments I even found 1 and 2 being some 26 s slower than the standard-settings.
RT_Test
Furthermore the RT solver did not work with my own (even simpler model). It simply would not start running the dynamics with the RT option.
(Model works just fine with GSTIFF)
 
Calling this disappointing would be a compliment from the user point of view.
At the end you guys require buying a license for making my analysis unstable and slower ?
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  • Jesper Slattengren
    0 Jesper Slattengren over 9 years ago
    Martin, did you have the FTire realtime mode activated? Does it use one core per tire?
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  • Kent West
    0 Kent West over 9 years ago
    More background from my colleague in our Product Development group that verifies what you are seeing: currently FTire RT is not integrated with our Fixed Step Integrator; we have an open task to work with Cosin to resolve this issue. 
     
     
     
     
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  • MK202610123211
    0 MK202610123211 over 9 years ago
    The effect occurs without using the run_time_mode option.
    Find the test case with the MDI Demo and the example tire from the acar_shared attached.

    Attached Files (1)
    RT_Example.tar.gz
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  • Jacco.Koppenaal
    0 Jacco.Koppenaal over 9 years ago
    Martin,
    We discussed FTire RT integration in our Fixed Step Integrator with Cosin some time ago and will work with Cosin to resolve the issues.
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  • MK202610123211
    0 MK202610123211 over 9 years ago
    BTW: Michael Gipser complained to me about not being able to access this new community platform.
    His user was not automatically ported to the new system and after contact with MSC support he was told that he'd receive a new user/password (which did not happen,  yet)
    Obviously that process is not as professional and reliable as you'd wish it to be.
    No wonder it's even more quiet here than in the old forum.
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