USER'S GUIDE - ShipWeight

Additional features
4.2 Gyradius
When selecting Gyradius… under the View menu, approximated key values
for gyradius can be obtained.
The following formulas are used for calculation of Roll gyradius:
K
I
I
i
i
tx,
ox
tx
ox
i yz
xx
xx
=
= I
=
tx
I
= w(
x
Δ
+ I
∑
2
xx
i
w
= ( a
12
tx,
ox
+ y
2
ox
2
)
+ b
= w⋅
( y ⋅ z)
2
)
4-14
ShipWeight – User’s Guide, version 10.0, April 2011
K xx = gyradius
w = weight of item
Δ = displacement
I tx = sum of transference inertia of elements i tx
I ox = sum of item inertia of elements i ox
(= 0 when ‘Include 2.term of Steiner theorem’ is not
selected)
x,y = location of the item with respect to CoG
a,b = extension of the item
Similar formulas are used for Pitch and Yaw calculations.
For Pitch/Yaw calculations, the following formula applies: