Page 283 - statbility for masters and mates
P. 283
Liquid pressure and thrust. Centres of pressure 271
where
or and
Fig. 30.4
X Depth of centre of pressure below the surface
xEyEdx X xEyEdx X wEgE x2EyEdx
x2EyEdx X xEyEdx
; Moment of total thrust about OY wEgE
wEgE
The value of the expression x2EyEdx can be found by Simpson's Rules using values of the product x2y as ordinates, and the value of the expression xEyEdx can be found in a similar manner using values of the product xy as ordinates.
Example 1
A lower hold bulkhead is 12 metres deep. The transverse widths of the bulkhead, commencing at the upper edge and spaced at 3 m intervals, are as follows:
15.4, 15.4, 15.4, 15.3 and 15 m respectively.
