paper: CG Migration of Robot Crossing Bump using Powerpoint

[IKE]

Thread created automatically to discuss a document in CD-Media.

CG Migration of Robot Crossing Bump using Powerpoint by IKE


We used this technique during our chassis design process to look at some important aspects towards going over the bumps. Seeing a lot of neat Chassis up on CD, I felt this would be a useful visualization tool for other teams.

[thefro526]

This is an awesome resource to show younger members (and some veterans) the effect of COG on bump crossing.

I also love the humor, one of the Engineers at my job and I got quite a laugh out of the robot face plant.

Thank you.

[Diminish]

Really sweet powerpoint!

Also, did you consider that the wheel base for most robots will not be so continuous? As in, there will probably be a gap in the middle (4 wheeled bot) and it would force the "crest" moment to be a lot sooner, possibly enough to get away with a high CG robot...

But I assume this was mainly for your team, and your team has chosen treads, so thanks for sharing with us!

[IKE]

Originally Posted by Diminish

Really sweet powerpoint!

Also, did you consider that the wheel base for most robots will not be so continuous? As in, there will probably be a gap in the middle (4 wheeled bot) and it would force the "crest" moment to be a lot sooner, possibly enough to get away with a high CG robot...

But I assume this was mainly for your team, and your team has chosen treads, so thanks for sharing with us!

Yes, this is essentially a treaded design. I have used this technique to look at several designs (4WD, 6x6 flat, Rocker....) I chose to present the tank as it has the most impressive Transistions.

[Diminish]

"I chose to present the tank as it has the most impressive Transistions"

Theatricality - I like it

[kramarczyk]

For those that are wonder where their CG will end up, take a look at http://www.chiefdelphi.com/media/papers/2048
It allows both weight budgeting and CG estimation. You can use this to get an estimate before the CAD modeling gets too far along. 10-20 minutes spent now on budgeting can save hours (or even days) of rework.

I apologize that the user interface is not slicker and am open to suggestions for improvement.

[BC_caveman]

Excellent graphical presentation. I would like to suggest a more correct terminology usage. The center of gravity does not change (unless you have moving components), the Moment of gravity is what is being depicted by the vector. This, along with center of mass, is used in aircraft and ship stability calculations also.

[JVN]

Pretty cool paper. It is a great visual way to demonstrate CG. I like it.

-John