Hello Everyone, I am trying to perform a full vehicle simulation; however, when I replace the default rear suspension with my rear suspension model, the simulation fails. I have attached the model and the video file.
Hi @premkumar_07,
It looks like the initial position of your vehicle model causes an erratic starting orientation. In rare cases, the Static simulation that begins these Standard Driving Events does not reach an ideal starting orientation before the maximum step number is reached. This may be due to some non-linearity of your custom vehicle model. If you deactivate the Run Initial Static option in the Entity Browser for the DLC event, the model will skip this static simulation and initialize with 1-2 seconds of equilibrium needed. Alternatively, you can increase the Maximum Number of Iterations in the Static Global Simulation Settings or the Static Settings in the event definition.
Hope this helps!
Adam Reid
I tried increasing the number of iterations; it worked at 36 km/h, but at 72 km/h the model started to float in space.
Did you try deactivating the Run Initial Static option in the Entity Browser?
hello, I am not able to find that option.
In version 2026, it appears as shown:
Therefore, you must be using an older version. Which version of HyperMesh Desktop do you currently have deployed?
I also see you are running this as Real Time Compliant. Have you tried running without that enabled?
I used the Default Analysis without the Driver active to see how your model initializes.
Your vehicle looks to jump considerably at initialization:
I would investigate your suspension settings to increase your model stability.
hello, I am using the 2025 version, and I have tried without real-time compliance.
This time I did not imported my suspension model , I kept the default rear suspension and just changed the hard point which reflects my model and the error reamained the same
If you deactivate the default body clamp joints (shown below) everything looks to run just fine:
Those joints exist to help stabilize the simulation in a static setting, then are deactivated once the transient simulation begins. Since your rear suspension pops afterwords, they are actually doing more harm than good.
Hello, Thank you for resolving the issue. What could be the possible cause of the rear tire hop? I would also appreciate it if you could suggest a few debugging approaches.
It's not wheel hop, it's your suspension extending rapidly. Based on the steady state values, your front suspension wants to extend about 25 mm and the rear almost 40 mm.
