Starting & Rolling Resistance Sad
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Posted by: ABURNS

12/17/2005, 07:02:36

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I am currently working on designing a mobile Pneumatic test rig and need to calculate the force required to initially get the rig rolling and the force thereafter to keep it in motion, the weight of the rig is 250kg and is supported on 4-off 100mm dia. nylon casters............can anyone help?!!






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Re: Starting & Rolling Resistance
Re: Starting & Rolling Resistance -- ABURNS Post Reply Top of thread Forum
Posted by: zekeman

12/18/2005, 21:30:59

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Your main contributor of force is the acceleration you need to get to speed. Your rolling friction is negligible. Only bearing friction of the wheels and gearbox conribute, also small by comparison. If you actually need it , you must specify the bearing
design and gearbox design. The force due to the acceleration is
weight/32*acceleration.
For uniform acceleration,A
A=(final speed)/(time to get to speed)






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Re: Starting & Rolling Resistance
Re: Re: Starting & Rolling Resistance -- zekeman Post Reply Top of thread Forum
Posted by: zekeman

12/18/2005, 21:40:49

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Correction for units. I correctly gave it in the old English system where
force is in lbs, weight in lbs and acceleration is in ft/sec^2; if you use MKS sys, then force (Newtons) = mass (KG)*acceleration (meters/sec^2)






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