Page 30 - Sayı-08

28 M.O. ŞERİFOĞLU, T. HIZARCI and H. AKYILDIZ

Table 5: FMEA table for possible glider navigation system errors

Parent Item / Potential Potential Sev Potential Causes Prob Detection Mode D RPN
Failure Effect of of Failure et
Mechanism Function Modes Failure

Low power-

Ballast Break down Cannot 6 Cable separation- 5 Vehicle cannot 9 270
Pump pull/push water High pressure- change direction

Random

Ballast Water fills in
Mechanism
Ballast Crack hull- Overall 9 Material fracture 1 Vehicle cannot go 3 27
Tank weight up

increases

Coupler Separation Pump cannot 5 Material 2 Vehicle cannot 7 70
pull/push water deformation/fract change direction

ure

Information Control unit cannot

Main Mother Break down transfer to 10 Random get signal or cannot
Control Unit Board motors and 2 connect satellite 8 160
communicatio
vehicle cannot

n units stops move as needed

Pitch Break down Unable to 5 Low power- Cannot achieve
Motor change Random nose up/down
5 position gyro pitch 9 225
longitudinal reading is stable
center of mass
over time

Unable to Cannot achieve
nose up/down
Pitch Motion Mill Stuck change 5 Material fracture- 5 position gyro pitch 5 125
system longitudinal bending reading is stable

center of mass over time

Coupler Separation Unable to 5 Material Cannot achieve
change deformation/ nose up/down
2 position gyro pitch 7 70
longitudinal fracture reading is stable
center of mass
over time

Unable to Cannot achieve

change turning with

Roll Servo Break down transverse 4 Random 5 necessary angle 9 180

center of cannot achieve

Roll Motion gravity needed location

System Unable to Cannot achieve

change Material turning with

Coupler Separation transverse 4 deformation/ 2 necessary angle 7 56

center of fracture cannot achieve

gravity needed location

Emergency

Battery Break down Power loss at 7 Random control/battery unit
Unit mother board 5 cannot get signal 9 315
and engines
from main

control/battery unit

Unable to

achieve

Energy Unit Battery Short circuit necessary 9 Open cable/ 3 Circuit controller 4 108
Unit voltages- main Human error- sensors
computer and/ water in hull

or electrical

engines stop-

fire

Cable Connection One or more 7 Material fraction- 6 Circuit controller 7 294
Fail motors stop- random sensors-
Mother board
stop- short information of
motors not
circuits
working- no signal
from main control

GiDB|DERGi Sayı 8, 2017