Roll Angle not zero in the beginning of analysis

mush ab
mush ab Altair Community Member
edited October 2023 in Community Q&A

why doesn't my model roll angle start with zero at the beginning of step steer analysis

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Answers

  • GTT Adam
    GTT Adam
    Altair Employee
    edited October 2023

    Hi! The initialized position and speed of a driven vehicle is calculated before data is recorded. Based on your supplied MDL file, your vehicle's CGY is -1.50729 mm, and thus should have an initialized roll angle. To verify this, you could track roll angle vs. time during a simple simulation where we allow the vehicle to settle under gravity by:

    • Suppressing the event
    • Suppressing the Altair Driver Model
    • Running a Transient simulation for 1 second

    I followed those steps and created the following plot (Capture001.png). Here you can see the roll angle starts at 0 degrees.

    Hope this helps!

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