Appendix

Table 8.1: ISO 14224:2016 standardized failure mechanism classification
Category Code Classification
Mechanical failure 1.0 General
1.1 Leakage
1.2 Vibration
1.3 Clearance/alignment failure
1.4 Deformation
1.5 Looseness
1.6 Sticking
Material failure 2.0 General
2.1 Cavitation
2.2 Corrosion
2.3 Erosion
2.4 Wear
2.5 Breakage
2.6 Fatigue
2.7 Overheating
2.8 Burst
Instrument failure 3.0 General
3.1 Control failure
3.2 Nosignal/indication/alarm
3.3 Faultysignal/indication/alarm
3.4 Out of adjustment
3.5 Software error
3.6 Common cause/Common mode failure
Electrical failure 4.0 General
4.1 Short circuiting
4.2 Open circuit
4.3 No power/voltage
4.4 Faulty power/voltage
4.5 Earth/isolation fault
External influence 5.0 General
5.1 Blockage/plugged
5.2 Contamination
5.3 Miscellaneous external influences
Miscellaneous 6.0 General
6.1 No cause found
6.2 Combined causes
6.3 Other
6.4 Unknown
Table 8.2: ISO 14224:2016 standardized maintenance activity classification
Code Action
1 Replace
2 Repair
3 Modify
4 Adjust
5 Refit
6 Check
7 Service
8 Test
9 Inspection
10 Overhaul
11 Combination
12 Other
Table 8.3: Quantiles of vibration measurements by status
Measurement Status Min. Q1 Median Q3 Max.
ADE Normal 0.005 1.3635 2.4820 3.8610 360.576
ADE Alert 3.520 4.0115 4.4390 5.0170 5.981
ADE Danger 6.109 7.1960 8.9500 13.1860 387.585
ANDE Normal 0.124 1.6470 2.6470 4.2175 130.573
ANDE Alert 3.502 3.9920 4.3800 5.1820 5.945
ANDE Danger 6.170 7.2780 7.8460 9.2160 10.590
HDE Normal 0.114 1.4990 2.6040 4.6190 500.000
HDE Alert 3.593 4.1020 4.7750 5.3330 5.904
HDE Danger 6.034 7.3260 9.7030 12.2650 500.000
HDE.CAV Normal 0.306 1.6265 2.5590 4.9135 168.149
HDE.CAV Alert 3.558 3.9045 4.6820 5.0195 5.612
HDE.CAV Danger 6.367 7.6860 8.7600 11.7530 22.279
HDE.ENV Normal 0.000 0.0360 0.0730 0.1555 6.916
HNDE Normal 0.124 1.6580 2.9770 5.4670 500.000
HNDE Alert 3.518 4.0455 4.6795 5.2590 5.979
HNDE Danger 6.096 8.0330 9.4090 13.7420 271.508
HNDE.ENV Normal 0.001 0.0340 0.0660 0.1515 33.502
HNDE.ENV Alert 4.991 4.9910 4.9910 4.9910 4.991
HNDE.FL Normal 0.004 1.2870 2.4050 4.2690 52.019
HNDE.FL Alert 3.557 4.3220 4.6890 5.3610 5.995
HNDE.FL Danger 6.014 6.8990 10.0060 13.5650 62.193
VDE Normal 0.131 1.3200 2.2180 3.9440 500.000
VDE Alert 3.514 3.9970 4.4900 5.3740 5.996
VDE Danger 6.014 7.3660 10.9775 16.0080 500.000
VNDE Normal 0.061 1.3150 2.1445 3.6235 500.000
VNDE Alert 3.531 3.9395 4.4160 4.9560 5.797
VNDE Danger 6.140 7.3270 9.2060 14.0870 35.022
Summary of the missing values for vibration variables for fan data. The left plot indicates the proportion of missing values by variable. The right plot indicates the combinations of missing(grey) and non-missing values along with their relative proportions.

Figure 8.1: Summary of the missing values for vibration variables for fan data. The left plot indicates the proportion of missing values by variable. The right plot indicates the combinations of missing(grey) and non-missing values along with their relative proportions.

Table 8.4: Component loadings for the first 4 principal components using vibration measurements
Variable PC1 PC2 PC3 PC4
ADE 0.493 0.144 0.244 0.19
ANDE 0.457 0.081 0.434 0.195
HDE.CAV 0.231 -0.162 0.126 -0.872
HDE.ENV 0.195 -0.525 -0.174 0.159
HDE 0.181 -0.405 -0.199 -0.207
HNDE.ENV 0.255 0.368 -0.64 -0.08
HNDE 0.12 -0.467 -0.342 0.297
VDE 0.444 0.331 -0.326 -0.021
VNDE 0.384 -0.208 0.184 0.05
Cum. Var. 37% 58% 71% 81%
Note:
Cum. Var. represents the percentage of cumulative
variance explained by the principal components.
HNDE.FL is not included as it is not measured on fans
Biplot of the fan vibration PCA

Figure 8.2: Biplot of the fan vibration PCA

Table 8.5: Component loadings for the first 4 principal components using vibration measurements
Variable PC1 PC2 PC3 PC4
ADE 0.388 0.12 0.474 0.144
ANDE 0.194 -0.591 0.389 0.094
HDE.CAV 0.231 -0.115 -0.297 -0.704
HDE.ENV 0.469 0.222 0.144 0.191
HDE 0.309 0.156 -0.337 -0.091
HNDE.ENV -0.001 -0.36 -0.557 0.61
HNDE 0.298 0.521 -0.221 0.225
VDE 0.439 -0.168 -0.014 -0.013
VNDE 0.401 -0.347 -0.206 -0.084
Cum. Var. 34% 49% 61% 72%
Note:
Cum. Var. represents the percentage of cumulative
variance explained by the principal components.
HNDE.FL is not included as it is not measured on fans
Table 8.6: Universal part-of-speech abbreviations and their meanings
Abbreviation Meaning
ADJ adjective
ADP adposition
ADV adverb
AUX auxiliary
CCONJ coordinating conjunction
DET determiner
INTJ interjection
NOUN noun
NUM numeral
PART particle
PRON pronoun
PROPN proper noun
PUNCT punctuation
SCONJ subordinating conjunction
SYM symbol
VERB verb
X other