Yamaha YP-X Series, Owner'S Manual

Page: 102 / 110

CHAPTER 6 Specifications
6-20
3. When the object's center line is offset from the rotation center.
The equation for the moment of inertia, when the center of the cylinder is
offset the amount of “x” from the rotation center as shown in Fig. 6-20, is
given below.
D
h
x
ρ π
D
4
h
32g
ρ π
D
2
hx
2
4g
= J +
W : Weight of the cylinder (kg)
WD
2
8g
= +
Wx
2
g
(kg · cm · sec
2
)
...(6.3)
Center line Rotation center
Fig. 6-20
In the same manner for the rectangular column in Fig. 6-21.
a
c
b
x
ρ
abc (a
2
+b
2
)
12g
ρ
abcx
2
g
= J
+
W : Weight of the rectangular column (kg)
W (a
2
+b
2
)
12g
=
+
Wx
2
g
(kg · cm · sec
2
)
...(6.4)
Center line
Fig. 6-21