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How to create a part with varying mass ? And how to parameterize the CG of the part due to change in mass?

0 Rishikesh Mokashi over 3 years ago

Hi Goutam

Mass can't be changed w.r.t. time in Adams. There are few articles here that provide some alternatives:

https://simcompanion.hexagon.com/customers/s/article/methods-for-modeling-time-varying-mass-of-an-adams-part-kb8019687

https://simcompanion.hexagon.com/customers/s/article/changing-part-mass-on-the-fly-kb8022893

https://simcompanion.hexagon.com/customers/s/article/paper---modeling-time-and-position-varying-mass-properties--kb8013659

I hope this helps.

Regards

Rishi
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0 Jesper Slattengren over 3 years ago

If you can't see the link to "Modeling Time and Position Varying Mass Properties" inside the third link, that is the way to go. The model attached to that model should tell you all you need. In short:

A massless part is attached to the "rocket" (I call it rocket as that is the most common application for this) with a translational joint and a motion (only if cg-variation is only a function of time, otherwise use a GCON). On this massless part that represents the CG of the rocket a GFORCE is attached. The GFORCE has the function F=-m*a (in all six components, you have to work out the functions for the rotations if they are of interest to you). m is the varying mass.
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0 Goutam over 3 years ago

Hey Rishikesh,

The technical paper on 'Modeling time and position varying mass properties' was helpful, but the .adm file doesn't contain any parts as referred in the .txt file, only a translation joint with a motion was imported through .adm. Even the forces mentioned in the paper were not imported. Tried importing in older versions as well 2017.2, 2019 and newest 2023.2 its the same. Please check at your end.
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