Environmental Engineering Reference
In-Depth Information
The steady reducedwindmodel in combinationwith the extreme designwave should be used
for DLC 6.1c. The max. 50-year wave height (H
¼
H
max,50
)
7)
during a 3 h storm and the
reduced50-yearwind speed, that is the extreme1-minwind speedaverage (V
hub
¼
V
red,50
) are
used here, see [11] 4.3.3.2 (15):
H
max
;
50
¼
1
:
86
H
s
;
50
H
B
ð
see Section 2
:
5
:
8
Þ
0
:
14
V
red
;
50
ð
z
Þ¼
1
:
1
V
ref
ð
z
=
z
hub
Þ
The turbulent wind model together with irregular sea states should be used for DLC
6.3a. The significant 1-year wave (H
¼
H
s1
) and the average 1-year wind speed
(V
hub
¼
V
1
) are to be used here. The average values of H
s1
and V
1
are to be adapted
to the duration of the simulation, see Table 2.9.
The steady extreme wind model in combination with the reduced design wave should
be used for DLC 6.3b. The extreme 1-year wind speed, the max. 3 s gust (V
hub
¼
V
e,1
)
and the reduced 1-year wave height (H
¼
H
red,1
) are to be used here, see [11] 4.3.3.2
(15):
V
e
;
1
ð
z
Þ¼
0
:
8
V
e
;
50
H
red
;
1
¼
1
:
32
H
s
;
0
:
1
H
B
Irregular sea states are to be assumed for DLC 6.4 (as for DLC 1.1 and 1.2). In doing so,
the related average wind speed should be limited to V
hub
<
0.7
V
ref
.
The average 50-year wind speed (V
hub
¼
V
ref
) is to be combined with the reduced
1-year wave height (H
¼
H
red,1
) for DLC 6.5.
The 50-year ice load (see Section 2.8) is to be combined with the reduced 50-year wind
speed (V
hub
¼
V
red,50
) for DLC 6.7.
Parked after a fault (DLC 7.1 to 7.2)
This design situation takes into account the non-standby state (standstill or idling) in
the event of a fault.
The steady extreme wind model in combination with the reduced design wave is to be
used for DLC 7.1a (as for DLC 6.3b).
The steady reduced wind model in combination with the extreme design wave is to be
used for DLC 7.1b. The max. 1-year wave height (H
¼
H
max,1
) during a 3 h storm and
the reduced 1-year wind speed, that is the extreme 1-min average of the wind speed
(V
hub
¼
V
red,1
) are to be used here, see [11] 4.3.3.2 (15):
H
max
;
1
¼
1
:
86
H
s
;
1
H
B
V
red
;
1
ð
z
Þ¼
0
:
8
V
50
;
red
Irregular sea states are to be assumed for DLC 7.2 (as for DLC 1.1 and 1.2).
The details of these design load cases (including transport, erection, maintenance and
repairs) are described in [11] 4.3.3.5.
7)
Note: H
max
is the maximum value on the basis of 1000 waves in deep water.
