Final report for WP4.3: Enhancement of design methods ... - Upwind

UPWIND WP4: Offshore Support Structures and Foundations
Excitation Force (surge) [MN]
Excitation Force (roll) [MN.m]
unrestrained motion (surge) [m]
unrestrained motion (roll) [deg]
1
0.5
0
-0.5
-1
0 5 10 15 20 25
Time [s]
8
6
4
2
0
-2
-4
-6
-8
0 5 10 15 20 25
Time [s]
Excitation Force (sway) [MN]
Excitation Force (pitch) [MN.m]
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
0 5 10 15 20 25
Time [s]
10
5
0
-5
-10
0 5 10 15 20 25
Time [s]
114
Excitation Force (heave) [MN]
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
0 5 10 15 20 25
Time [s]
Excitation Force (yaw) [MN.m]
30
20
10
0
-10
-20
-30
0 5 10 15 20 25
Time [s]
Figure 8.29: Comparisons between first and second-order excitation forces in surge, sway, heave, roll, pitch and yaw
modes for a Pierson-Moskowitz spectrum with Hs=0.5 m (Tp = 3.54 s).
0.02
0.015
0.01
0.005
0
-0.005
-0.01
-0.015
0 5 10 15 20 25
Time [s]
x 10-3
6
4
2
0
-2
-4
0 5 10 15 20 25
Time [s]
unrestrained motion (sway) [m]
unrestrained motion (pitch) [deg]
0.01
0.005
0
-0.005
-0.01
0 5 10 15 20 25
Time [s]
x 10-3
10
8
6
4
2
0
-2
-4
-6
0 5 10 15 20 25
Time [s]
unrestrained motion (yaw) [deg]
unrestrained motion (heave) [m]
x 10-4
8
6
4
2
0
-2
-4
-6
-8
0 5 10 15 20 25
Time [s]
0.02
0.015
0.01
0.005
0
-0.005
-0.01
-0.015
-0.02
0 5 10 15 20 25
Time [s]
Figure 8.30: Comparisons between first and second-order unrestrained motions for the semi-submersible platform for a
Pierson-Moskowitz spectrum with Hs=0.5 m (Tp=3.54 s).