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44 D.ÖZTÜRK and H.AKYILDIZ

Function failure modes Effects S Causes O RPN

User interface is 3 24

damaged 3 15
3 24
Master control 3 21

unit is damaged 2 16

System does not be opened/closed System cannot produce any lifting 8 Battery is 3 21
F1 manually force damaged 2 16
3 24
It takes too much time to open/close Users have to wait some time for Battery losses 3 24
the system manually roll damping 3 24
efficiency 3 12
3 12
Power unit is 2 16
3 12
damaged 28

5 User interface is
not compatible

Motion sensor is

İnclination angles do not be sensed System cannot produce any lifting 8 damaged
F2 force Master control
System produce inadequate lift
İnclination angles cannot sensed force unit is damaged
correctively
Extra resistance 7 Motion sensor
Rotors do not rotate losses efficiency
F3 System produce inadequate lift
force Drive motor is
Rotors do not rotate enough to Extra resistance
produce efficient lifting damaged
Flow direction and velocity does not
F4 be sensed Power unit is

damaged

8 Battery is
damaged

Master control

unit is damaged

User interface is

damaged

7 Speed sensor
losses efficiency

Motion sensor is

8 damaged
Master control

unit is damaged

Flow direction and velocity does not Rotors cannot rotate in correct way 8 Motion sensor
be sensed correctively losses efficiency

Rotation direction of rotors is not Roll motion of ship increases 8 Position sensor
F5 correct losses efficiency
Roll motion of ship increases
Rotation direction of rotors is same 8 Position sensor
System produce inadequate lift losses efficiency
Speed is not enough force
F6 System produce inadequate lift 4 Speed sensor
force losses efficiency
Speed is excessive
4 Speed sensor
losses efficiency

Motion sensor is

Sensors do not inform the master System cannot produce any lifting 8 damaged
control unit about inclination angle force Master control
F7
Sensors do not inform correctly the System produce inadequate lift unit is damaged
master control unit about inclination force
angle 4 Motion sensor
System produce inadequate lift losses efficiency
force
Sensors are

F8 Master control unit does not inform 4 damaged
the sensors to work Master control

unit is damaged

Appendix B (continue): Applied FMEA procedure on functions

GiDB|DERGi Sayı 7, 2016