Partial Constraints?

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  • AlexG
    Junior Member
    • Jun 2019
    • 4

    Partial Constraints?

    Hi!

    I'd like to calculate the structural mechanics of diverse bones articulated with diffent types of joints.
    In a very much simplified model, for instance, one could image to represent bones by solids and a ball-and-socket joint by a "rigid spherical joint".
    In practice, however, the degrees of freedom of a joint are often confined to a specific domain.

    My questions:
    Is there any way to confine the degree of freedom to a specific range of values? For example, in case of a "rigid spherical joint" is there a way to confine the rotation around the x/y/z-axis to an angular range from -20 to +25 angular degrees?
    Or is it only possible to constrain the degrees of freedom by setting real "hardware" boundary conditions and contact interfaces accordingly?


    Any suggestions are very much appreciated!
    Cheers!
    AlexG
  • maas
    Lead Code Developer
    • Nov 2007
    • 3457

    #2
    Hi AlexG,

    There is no way to limit the range of the dofs of a joint, unfortunately. The only way to do this, as you already noted, is by restricting the range of motion of the geometry through contact. However, if this is a feature you really need, feel free to make a feature request on the appropriate forum and we'd be happy to look into it.

    Cheers,

    Steve
    Department of Bioengineering, University of Utah
    Scientific Computing and Imaging institute, University of Utah

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