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Re: [cracklover] Impact force vs. fall length, fixed fall factor:
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cracklover
Jul 18, 2011, 8:38 PM
Views: 16507
Registered: Nov 14, 2002
Posts: 10162
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Edits inserted in red
Here you go, I put it in an online document: https://spreadsheets.google.com/...E&hl=en_US#gid=0
The number for the model_tension comes by plugging all the numbers given in pavier's chart into the standard rope model equation. The only number not provided in his paper is the modulus for the rope. For that I simply assumed a modulus that would provide an average difference of zero. Any other modulus would work equally well, it makes no difference.It turns out that while small changes in modulus make no difference, as the modulus gets over ten, the effect I found disappears. If one assumes a still higher modulus, the affect actually reverses!
So, for pavier's setup, it appears that the shorter the fall, the higher the force, relative to the standard model, and the longer the fall, the lower the force (again, relatively).Again, only at the modulus I used.
Note that this observed difference is quite small! The largest difference is a few percent.
So, to answer the OP's question, at least in Pavier's setup, the FF is almost entirely predictive of the impact force, but there is also a very small (at most a couple percent of the force) change depending on the actual fall length.There is no strong evidence for any relationship between fall distance and force, except as it relates to fall factor.
GO
(This post was edited by cracklover on Jul 19, 2011, 3:29 PM)
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Edit Log:
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Post edited by cracklover
() on Jul 19, 2011, 3:29 PM
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