What is default unit system of Hypergraph?

TheConvolutedMind
TheConvolutedMind Altair Community Member
edited December 2022 in Community Q&A

I'm new to Altair and so confused with the Units system? What is the default units of the axis in HyperGraph? For Example, If I import the CAD with length(mm) in MotionView, will the axis in HyperGraph do have same units (mm in my case) ?

 

What will be that for the force and acceleration (for derived quantities) ? Will it be Kg/mms^-1 and mms^-1 ?

 

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Best Answer

  • Praful
    Praful
    Altair Employee
    edited December 2022 Answer ✓

    Hello Aditya - If you have selected length unit as mm in the Solver Units dataset in MotionView, the length based outputs such as Displacement/Velocity/Acceleration unit will have the length dimension in mm when solved with MotionSolve.

    For MotionSolve results, Hypergraph does not recognize unit system, hence the axes would represent whatever unit that is set in MotionView.

    Force and acceleration are not "derived" quantities in MBD like in FE. If you have set the Force unit in the Solver Units as N, the force outputs are directly interpreted as N. Likewize for acceleration, the outputs will have the same unit of length and time as chosen in the Solver Units.

    imageimage

     

    Hope this helps

    Regards

    praful

Answers

  • PaulAltair
    PaulAltair
    Altair Employee
    edited December 2022
    Hypergraph just displays whatever is in the output file from the solver, some solvers embed meta-data for the units, others do not. Hypergraph allows you to define units for incoming data on import if there is no meta data (if unit scaling is enabled) otherwise it just displays the raw data. You need to adopt a consistent units system for your analysis, for mm, the 2 most common are T mm s N MPa and kg mm ms kN GPa
  • Praful
    Praful
    Altair Employee
    edited December 2022 Answer ✓

    Hello Aditya - If you have selected length unit as mm in the Solver Units dataset in MotionView, the length based outputs such as Displacement/Velocity/Acceleration unit will have the length dimension in mm when solved with MotionSolve.

    For MotionSolve results, Hypergraph does not recognize unit system, hence the axes would represent whatever unit that is set in MotionView.

    Force and acceleration are not "derived" quantities in MBD like in FE. If you have set the Force unit in the Solver Units as N, the force outputs are directly interpreted as N. Likewize for acceleration, the outputs will have the same unit of length and time as chosen in the Solver Units.

    imageimage

     

    Hope this helps

    Regards

    praful

  • venkata
    venkata
    Altair Employee
    edited December 2022

    In addition to Praful and Paul's comments we can change the curve units by right-clicking on the curve and select edit units as shown below.

    we can completely switch off units using preferneces dialog as well. 

     

    image

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