ssc-367 - Ship Structure Committee

I . + [ (+)-L (+ - t)4] (cm4)
COLUMN H: THE TOTAL EFFECTIVE MASS IS COMPUTED
me = , [(+)~.( + - t)2] (0.785) +ma (kg/m)
COLUMNI:
THE CRITICAL VELOCITYFOR CROSSFLOW OSCILLATION IS
COMPUTED.
COLUMNJ:
13160 n:
v= cr
(m/s)
(L/D)2
ENTER THE THRESHOLDWINDVELOCITY= ‘thr
COLUMN K: THE STABILITY PARAMETER IS COMPUTED
Ks =
2me (2~E)
PD2
COLUMN L: THE REYNOLDS NUMBER IS COMPUTED
Before performing calculation in the following columns, the
velocity is compared with the threshold velocity. If the
velocity is larger, crossflow oscillations will not occur
computations are supressed. An “N.A.” is then inserted
column.
critical
critical
and the
in each
If the critical velocity is less than the threshold value, the
following computations are performed.
COLUMN M: THE AMPLITUDE OF VIBRATION IS COMPUTED
Y=&
(~) Ks
Where a = 0.04925 for Re
and a = 0.07178 for Re
> 500,000
< 500,000
D-22