Custom Inertia Values resulting in Solver Error

draucis
draucis Altair Community Member
edited March 2023 in Community Q&A

Hello,

I have been trying to set the inertia values in my two-wheeler model according to the cad file I have. So My coordinate systems as well as the orientation on both the softwares match.  I have taken the coordinate system origin as the front wheel center and have taken all the coordinates for the model and the inertia values w.r.t that point itself.

In HyperWorks in order to establish a custom coordinate system for inertia I have chosen the inertia CSYS point as the global origin (0,0,0) which is also set to my front wheel center.  and then I am defining the inertia values in the properties tab. The Intertia Values though are pretty small according to my cad file w.r.t the origin which is the front wheel center.

As soon as I define my custom inertia values the solver is resulting in an error. Where do you think I am going wrong? because before that whatever I am doing the solver is running fine and I am getting my results 

Regards 

Draucis  

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Answers

  • Praful
    Praful
    Altair Employee
    edited March 2023

    Hello Draucis - What error are you seeing from the solver ? Can you share your model and also the inertia information you derived from CAD? Does the global system orientation in both CAD and MV match ?

    Can you try reversing the signs for the products of inertia?

    regards

    Praful

     

  • draucis
    draucis Altair Community Member
    edited March 2023

    Hello Praful,

    Thank you so much for your reply. So the update on the inertia thing is that I was initially using inertia values about a custom point and it was resulting in an error, after that I specified inertia values about the cg of each component after doing this the error is not there anymore.  and yes the global orientation matches in both the software. Sorry for the late reply, I was not active last week.

    Regards 

    Draucis

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