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# Tractive effort requirements

## Tractive effort requirements

(OP)
Has anybody got the calculation method for determining the tractive effort required to counter-rotate a tracked machine on various surfaces with varying track length and track pitch?
Thanks...

### RE: Tractive effort requirements

by counter rotate do you mean as in rotate about the centre of the vehicle (like a tank, with tracks moving in opposite directions to do a 360 spin).

If so then i think the best way to look at it would be to take a force couple, modeling the vehicle as a circle with tangental force components.

You would need to set a target rotational speed (omega [rad/s])

Its probably best to treat it like a spinning disc and calculate the torque by T=I.alpha

where T=torque, I = moment of inertia (need to also calculate this, different formulas for different shapes), alpha=angular acceleration (calulate by differentiating angular velocity (omega) wrt time).

Would be interested to see what others think...

### RE: Tractive effort requirements

This would be a very complicated calculation. Obviously the location of the center of gravity comes into play; but so does how level the ground is, and the exact tread design, etc.

Unless you are trying to optimize the design of a particular machine, I would look at other machines of similar size, weight and usage. On some machines the engine HP is more determined by not getting stuck in the mud than anything else.

I know it's not a very good answer, but if you want more help you need to provide more details.

ISZ

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