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Full Vehicle Model Flies Upward and Solver Fails with Integrator Error After Hardpoint Modification

Sobree

Hi everyone,

I'm working with a standard Full Vehicle Driver template in MotionView and modified the hardpoints to match my target vehicle specifications.

After updating the hardpoints, I ran a Kinematics and Compliance (K&C) simulation, and all the suspension links moved and articulated properly without any issues. However, when I try to run a Straight Line Braking (StrLineBrkt) event, the vehicle unexpectedly launches/flies upward into the air and falls down, causing the simulation to crash.

According to the log file, the solver terminates with the following error:
"ERROR: At time=8.585E+00 the integrator failed to proceed."

What I have tried so far to fix this:

I attempted to adjust the Spring Install Force and Spring Install Length, but the vehicle still behaves the same way (flies/bounces vertically).

Could anyone please guide me on what usually causes this kind of instability after a hardpoint change? Which parameters, joint constraints, or bushing limits should I look into to resolve this integrator failure?
Thank you in advance for your help!

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MotionView/MotionSolve

v2025.1

Accepted answers

Christopher_Fadanelli

Hi @Sobree ,

Regarding your model, I was able to run it after disabling the "Run Initial Static" option in the event settings.

After running the model, I noticed that the springs collapsed after some time. To address this issue, I modified the attachment points of the helical springs to the shock absorber components, which appears to better represent the physical setup.

After making these adjustments, the model ran successfully.

Model_StrLineBrk_EDIT_archive.zip

Best,

Chrisotpher Fadanelli

All comments

Christopher_Fadanelli

Hi @Sobree,

I'm sorry that you are experiencing a interesting phenomenon. Can you please share the archive (File > Export > Model > Archive Model) full vehicle model so that we can debug?

Best,

Christopher Fadanelli

Sobree

Hi Christopher,
Thank you so much for looking into this!
As requested, I have attached the archived full vehicle model (.zip) using the Export > Archive Model tool.
Please let me know if you find what is causing the system instability or the missing degree of freedom (DoF) after my hardpoint modification.

Best regards,

Sobree

Model_StrLineBrk_Archive.zip

Sobree

Best regards,

Sobree

Model_StrLineBrk_Archive.zip

Christopher_Fadanelli

Hi @Sobree ,

Regarding your model, I was able to run it after disabling the "Run Initial Static" option in the event settings.

After making these adjustments, the model ran successfully.

Model_StrLineBrk_EDIT_archive.zip

Best,

Chrisotpher Fadanelli

Sobree

Hi Christopher,
That did the trick! Thank you so much for looking into my model and finding the solution.
Disabling "Run Initial Static" fixed the instability immediately.
Your expertise is much appreciated!

Best regards,

Sobree