Author Topic: Center of gravity for three wheeled robot  (Read 1452 times)

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Offline MCTopic starter

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Center of gravity for three wheeled robot
« on: October 10, 2011, 01:44:27 AM »
I would like to know how to calculate the centre of gravity for three wheeled robot
I have attached an image of the triangle and shown the center of gravity.
Please let me know if the formula is right or should it be the other way round. i need to cal the weight on the three wheels when loaded and unloaded.


Thanks

Offline Soeren

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Re: Center of gravity for three wheeled robot
« Reply #1 on: October 11, 2011, 02:59:27 PM »
Hi,

I would like to know how to calculate the centre of gravity for three wheeled robot
I have attached an image of the triangle and shown the center of gravity.
Please let me know if the formula is right or should it be the other way round. i need to cal the weight on the three wheels when loaded and unloaded.
You can't calculate the CoG for the finished robot by calculating it for just the two dimensional form. but for a triangle, the point will be where the medians meet.

For a finished robot with batteries and all, you can ue three weight scales, one under each wheel (or a single if you can make the remaining wheels level with the scale surface at each measurement), to see how the weight distributes, but this is still in 2D and the Z-axis (upwards from where it stands) is just as important when the robot moves.
It's much more involved to find the 3D CoG.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline Gertlex

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Re: Center of gravity for three wheeled robot
« Reply #2 on: October 16, 2011, 10:42:30 PM »
3D CoG can be done my weighing the bot while its tilted a known amount (aka angles via knowing height of the wheels) and doing some amount of math... I've not done it personally, but that's how I've seen CG height determined before.
I

 


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