Center of MASS

RE: Center of MASS

Lorys — Wed, 29 Mar 2017 11:05:28 GMT

[quote user="Michael Alestra"]thanks, i'm aware of the math required to do this. The idea is to have the software do this so that don't have to perform this calculation on a bunch of different assemblies or if that geometry changes, having to update where the center of mass is.

we have the ability to store data in the cad file to add "intelligence" lets get this incorporated.

[/quote]

Yep I knew you knew... but for others just put it in there... plus it was fun to reminisce my college days... sniff....

Its never going to get in there in any SS or V8i current builds as its now all about connect edition...

You might be able to do some clever stuff in CE is tables and links or Fields .. properties...

did you put it into the suggestions for what we need in connect future edition(s)

hope its in there before we retire...! (I'm not using CE so not sure if can do what you actually want)

Too bad it was removed from the old modeler...

RE: Center of MASS

Ian Lapper — Tue, 28 Mar 2017 16:11:05 GMT

A long time ago, in a galaxy far far away, there use to be a program called Bentley Modeller. This tool had the ability define the CoM. Sadly this was removed, but you can see the CoM in the measure tools

RE: Center of MASS

Michael Alestra — Tue, 28 Mar 2017 11:45:21 GMT

thanks, i'm aware of the math required to do this. The idea is to have the software do this so that don't have to perform this calculation on a bunch of different assemblies or if that geometry changes, having to update where the center of mass is.

we have the ability to store data in the cad file to add "intelligence" lets get this incorporated.

RE: Center of MASS

Lorys — Tue, 28 Mar 2017 08:29:50 GMT

doesnt look like it any time soon, ..didnt we discuss a solution for this before .. oh well for those who are new to the post and have similar problem and for the poster

I think you can do it by combination of Cad and first principles ..( forgive me if I'm teaching grandma to suck physics ok)

Bare with me as I try to recall how to solve this from college applied Mech class back in the 80's

So ustn can show you the COG or CoM for each part so lets call those CG1 and CG2 , you can connect these two points even though the model is 3d...

Lets call this Total distance L now both CGs act at the ends in the same direction so sum of the moments down = reaction up

down M1gx +M2gy = g(M1+M2)(L) up .. ( about the real CoG for equilibrium..).

now the ratio of (M1 to M2) / M1+M2 will be the ration of (x to y)/L so you should be able to solve x and y by the mass ratios to the distance.. you now now relative to either end where x or y will be and what fraction of L , now where the CGs is known, and the L is known so the ratio of the masses will tell you where the real CG acts at along L... that seems right to me but its been 30 years ....

RE: Center of MASS

Michael Alestra — Mon, 27 Mar 2017 15:32:03 GMT

oh good, it was requested 7 years ago. Any chance it gets implemented before the decade is over? :P

RE: Center of MASS

Carl Myhill — Mon, 27 Mar 2017 15:29:31 GMT

This has been requested previously and there is an outstanding Enhancement Request ( 85863 ) mentioned in this thread

communities.bentley.com/.../108297
CR number: 295341