CALCS PROC071
HOIST DRUM

NOTATION

Ddodiameter, drum, outer surface
Ddidiameter, drum, inner surface
Edyoung's modulus, drum
vdpoisson's ratio, drum
Dcdiameter, cable
Dcmdiameter, wrapped cable, maximum
Ecyoung's modulus, cable
vcpoisson's ratio, cable
Ninumber of intervals, cable build up
Pcline pull
Dcodiameter, cable, outer
fhstress, hoop

APPLICATION

Drum subject to multiple wrap cable under tension

OUTPUT

Drum hoop stress

SEE ALSO

other progs & procs

THEORY

references

GUIDANCE

The program is configured so that the Ni need not correspond with the actual Dc. Care should be exercised in choosing values for Ec & vc. The value of Ec must reflect the area and stiffness ratios of the multi-strand nominally circular section cable relative to a solid square encompassing the circle.

INPUT FORMAT

LET Ddo=:Ddi=:Ed=:vd=:Dc=:Dcm=:Ec=:vc=:Ni=:Pc=:PROC071

EXAMPLE

Input

DAT010example (units: mm, N/mm^2, t)
DdoDdiEdvd
500480.207E60.3
DcDcmEcvcNiPc
20800.1E60.31010
ENDDAT

Output

Nlfhfh'
164857151.88
END010