WinGD X62DF-S2.0, Руководство по установке

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Marine Installation Manual 2022-03 6-7
6 Engine Dynamics
6.2 External lateral forces and moments
X62DF-S2.0
6.2.1 Lateral vibration types
The resulting lateral forces and moments generate two different modes of lateral
engine vibration, the H-type and X-type vibration; refer to
Figure 6 - 5 .
The table of H-type and X-type vibration values is also provided in the link
below:
External forces and moments
Figure 6 - 5 Lateral vibration — X-type and H-type
H-type vibration
H-type lateral vibrations are characterised by a mode shape where both sides of
the top of the engine, the driving and free end, vibrate together, in phase. The lat
-
eral guide forces (F
L
) result in a lateral moment, expressed as resulting lateral H-
type moment (M
LH
).
X-type vibration
X-type lateral vibrations are characterised by a mode shape where at the top of
the engine, the driving and free ends vibrate in counter-phase to each other. As
these resulting lateral guide forces create opposing axial moments at the two ends
of the engine, the X-type lateral vibrations are expressed as a moment around the
vertical axis, the resulting lateral X-type moment (M
LX
).
SM-0032
Resulting lateral X-type moment M
LX
=
M
LX
Resulting guide forces F
L
=
Resulting lateral H-type moment M
LH
=
M
LH
+
-
F
L
+
-
F
L
+
-
F
L