WINCH DRUM PRESSURE

[BEMPE16524]

Dear Experts,

I just want to know if my assumption is correct:

Line pull = 65,000 N
Safety factor = 3
Total, Ft = 195,000 N
Drum core Diameter, Dc = 1.2 meter
Drum Width, Wd = 1.5 m
No. of wire wrap = 37.5 (on single layer)
Circumference, C = pi.Dc
= 3.77 m

Wire Diameter, Dw = 0.04 m
Area covered by Wire on drum for one wrap, Aw = Dw.C
= 0.15 m^2

Pressure for one wrap = Ft/Aw
= 1.3 MPa

My question is; should i divide this pressure to 37.5 (no. of wrap) if the cable position is at final wrap as below sketch:

R.Efendy

 

[pylfrm]

BEMPE16524,

Without more explanation of your scenario, it will be hard for us to tell how good your assumptions are. What are you trying to calculate?

Is Ft intended to represent the tensile force (with safety factor) in the wire? If so, the arrow appears to be pointing in the wrong direction.

Do you expect the tensile force in the wire to be uniform over the full length wrapped on the drum core?

I suspect the equation for circumferential stress in thin-walled cylindrical pressure vessels may be of some interest to you.


pylfrm

 

[BEMPE16524]

pylfrm,

Yes i should point the arrow to certain angle actually but i didn't.

I actually need to know what would be the total pressure on drum if i use that line force because i need to do the FEA.
I know that thin walled cylinder equation can be used, only thing i have to make sure my first assumption of the pressure is correct.



R.Efendy

 

[berkshire]

BEMPE, do a search on this site using the search feature next to the word forum , there were 35 entries under the key word WINCH.
You may find your question has already been answered.
B.E.

You are judged not by what you know, but by what you can do.

 

[BEMPE16524]

berkshire,

Thanks for reminding. i think i got the answer or else, i will keep on asking here again.

R.Efendy

 

[BEMPE16524]

After looking around, i think these info looks good enough and make me confident:

https://archive.org/details/gov.in.is.6938.2005/page/n9

http://www.dtic.mil/dtic/tr/fulltext/u2/a955305.pdf

http://citeseerx.ist.psu.edu/viewdo...B09308F?doi=10.1.1.484.2754&rep=rep1&type=pdf

 

[dvd]

This is a good reference that has a section on winch drum design -

Design of Weldments