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Newton unit dimension - MotionView 2022.1

Thomas_ · 2025-01-24T09:38:36+00:00

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Thomas_

Hello,
I have troubles with MV units.
Curently, here are my solver units :

In my MV model, I want to apply a torque, using a Spring Damper object.

The units for the torque properties seems to be : N.mm.s/rad. Am I right for this ?

Also, the dimension definition of the N in SI is : kg.m/s².
But in MV, is N become kg.mm/s² ?
If yes 1 N/m become 10^6 N/mm in MV.

Does someone have a clue about this?

Thanks in advance.
Thomas

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Accepted answers

Vishvam

Hello @Thomas_Bécue
You are right in understanding the units for spring damper. I am assuming you meant units for the damping property to be (N-mm-s/rad). This is correct.

Regarding the second question about SI unit of force being kg-m/s², it should be noted that force is a function of the first three and can be automatically calculated for a consistent set of units. So we always give force units (N) in SI for all the entities in Motionview. The dependent conversions are taken care in the backend by the solver. Here is detailed documentation on units.

Hope this answers your query!

All comments

Vishvam

Thomas_

Hi,
Okay perfect, thanks!

Have a good day sir

Thomas_

@Vishvam
I have another question.
Is there an object more adapted to applied a rotational torque (N.mm) in a system than a SpringDamper ?
SpringDamper looks more useful to add angular stiffness? I was using it by putting Stiffness to 1 N.mm/rad and Preload Torque to great value. In order to apply only a constant rotational torque.

Maybe with rotationnal force ?

Thanks in advance,
Thomas

Orestis_YB

Hello @Thomas_Bécue,

you are right! Rotational force is the way to go. You can access it from the microdialog when selecting the force tool

You can apply the torque as action only or action reaction between two bodies. You can find more information in the documentation. If you are new to Multibody modeling I would strongly suggest to go through our MotionView/MotionSolve Introduction v2023 eLearning. Hope this helps!

Best regards,
Orestes

Thomas_

Hi!
Okay perfect !

Thanks, have a good day.

Thomas