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Design of Offshore Wind Turbine SupportFull description
The performance of a wind turbine is always a matter of discussions and the topic has been a keen interest to be researched and present more efficient solutions to the evident problems. The performance depends on so many factors handful of them are t
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Our vertical axis wind turbine (VAWT) works by capturing energy from the wind through its blades. The vertical orientation allows the device to be driven from any standard direction of the wind. Th...
Our vertical axis wind turbine (VAWT) works by capturing energy from the wind through its blades. The vertical orientation allows the device to be driven from any standard direction of the wind. Th...
Our vertical axis wind turbine (VAWT) works by capturing energy from the wind through its blades. The vertical orientation allows the device to be driven from any standard direction of the wind. Th...
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FMEA - Wind Turbine The following FMEA analysis has been performed for an offshore wind turbine in order to highlight potential component failures and their possible consequences. SYSTEMS
Components
Failure Mode
Consequences
Potential Causes
Currents Design Controls
Risk Priority Number
e c n
n r
t
oi
y e it r r
c u
e
e c
t O
D
v c e S
1.
Roller Bearing
1. 2. 3. 4.
Normal wear. Bearing Seizes. Damage to bearing surfaces due to foreign object(s). Damages caused by sudden or excessive loads.
i.
Reduced turbine
5
Normal wear causing increased friction
8
e
Turbine performance
efficiency
monitored for drop in efficiency
ii.
Turbine Stops
iii.
Unsmooth
iv.
Increased Noise
) a
240
Reduced lubrication increasing friction
4
Lubricant levels monitoring
8
160
8
Overheating Overheating due to lack to lubrication
3
Lubricant level monitoring
8
192
5
Foreign objects damaging bearing surfaces
3
Lubricant Filter
7
105
2
Bearing overloaded or incorrectly loaded
2
None
0
4
4
Fluid contaminates friction surfaces
6
None
0
24
Friction material overheats
7
High temperature friction
2
56
operation
ni
6
m( g inr a e B . 1
2.
Spring
1.
Spring Breaks
i.
Braking efficiency reduced.
ii.
Turbine stops
ii.
Brake cannot
materials specified.
prevent turbine 3.
Disc
) g
2. 3. 4.
ni (p
a
kr
4. k
e
Caliper
5.
ar
Friction material wears. Disk cracks due to repeated heat cycles. Contamination of friction surfaces. Calliper wear prevents full locking of brake.
rotation.
8
Brake fails to fail safe mode
6
Warning message produced
9
432
9
Both calliper and fail safe spring fail
2
Turbine speed sensor
8
144
Disc wear leads to complete disc failure
3
none
0
27
Turbine not correctly angled for optimum
8
None
0
40
6
Warning message produced
9
270
5
none
0
35
1
Warning message produced
9
72
B . 2
5.
Anemometer
1.
Wind speed sensor fails.
i.
Reduced Turbine
5
efficiency. ii.
wind performance
Damaged caused to other
Wind speed not detected so blade pitch is not
components components e.g.
optimised
bearing gearbox m
s
6. te
CPU
2.
s y S
3. ic n o tr le
c
7. 3
.
E
Wind direction system
4. 5.
System short circuit due to ii. water ingress. v. System Crash/software failure. Damaged (wired) connections. Wind direction sensor fails.
Turbine Stops.
7
Incorrect loading of components due to excessive speeds or incorrect wind angles
Error messages produced.
8
CPU fails and applies parking brake as fail safe.
1
System failures are indicated to the turbine
9
operators 8.
1. 2.
3. 4.
Blades crack due to excessive flexing. Aerofoil shape compromised due to plastic deformation caused by flexing. Strikes an object. Pitch controls fails.
i.
Reduced Turbine
5
efficiency. ii.
Blade flex leads to r educed aerodynamic
Warning if communications
9
81
with turbine are lost 7
none
0
35
3
Part of maintenance
5
75
efficiency
Damaged caused Blade cracks affect airflow over blades.
to other
schedule
components e.g. bearing gearbox due to incorrect
7
Shaft alignments compromised
3
none
0
21
8
Blade breaks (total failure)
2
Visual detection
4
64
8
Pitch motor fails
3
Warning message produced
9
216
Pitch gearbox fails
3
none
0
24
Anemometer fails
5
Warning message produced
9
360
Foundationsubsides
3
Visual checks
4
120
Erosion (tidal) weakens support
1
Part of maintenance
5
50
wind loadings. ii.
Turbine Stops.
v.
Turbine speed control is lost.
s e d la B . 4
9.
1.
Fails to support Tower
i.
Turbine collapse.
ii.
Turbine stops.
10
schedule s n iot a d n
8
Becomes unstable meaning turbine must be shutdown.
2
Visual checks
4
64
5
Normal wear causes increased friction
5
Turbine efficiency monitored
8
200
Reduced lubrication causes increased friction
3
Turbine efficiency monitored
8
120
Lubrication failure leads to gearbox seizure.
2
none
0
16
Internal component fails causing gearbox to
3
none
0
24
6
Part of maintenance
5
60
u o F . 5
2.
1. 2. 3. 4. 5.
Normal wear. Gearbox seizes. Damages to gears due to foreign object(s). Gear Tooth Breaks Gear Shafts move out of alignment.
components to seize, e.g. bearings/gearbox Turbine speed
6
cannot be
Blade angle cannot be c hanged to compensate for differing wind speeds.
controlled 19.
Bearing
h ct i P
20. R
o
Gears
. 2
5
Blade angle cannot be optimised for maximum efficiency
Efficiency ii.
to
r
Reduced Turbine
monitored
Catastrophic failure
10
Turbine speed cannot be controlled, excessive
1
Parking brake can be applied
7
70
1
Part of maintenance
5
25
speed causes turbine total failure
1
1
3
.
C
r
a
n
e
21.
Wheels
15. Seizes 16. Wear out 22. Bearing 17. Seizes 18. Wear out 23. Motor 19. Driver motor fails. 24. Frame 20. Collapses 21. Cracks All scores are out of 10. Meaning max possible RPN is 1000.
