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5.2.2.4 Perhitungan Mean Time To Failure (MTTF) Komponen Idler
Berikut
ini
merupakan
perhitungan
MTTF
komponen
idler
dengan
distribusi
normal :
MTTF = µ
=
352.0750 jam ˜ 14 hari
5.2.2.5 Perhitungan Index of Fit Untuk Waktu Perbaikan (TTR) Komponen Idler
?
Index of Fit Distribusi Weibull Time To Repair (TTR)
Tabel 5.15 Perhitungan Index of fit Distribusi Weibull untuk TTR Komponen
Idler
i
t
i
x
i
=
ln(
t )
i )
F(t )
i )
y
i
x
i
.y
i
2
x
i
y
2
i
1
0.42
-0.8675
0.0522
-2.9252
2.5376
0.7526
8.5569
2
0.42
-0.8675
0.1269
-1.9976
1.7329
0.7526
3.9902
3
0.50
-0.6931
0.2015
-1.4916
1.0339
0.4805
2.2249
4
0.50
-0.6931
0.2761
-1.1297
0.7831
0.4805
1.2762
5
0.58
-0.5447
0.3507
-0.8395
0.4573
0.2967
0.7047
6
0.58
-0.5447
0.4254
-0.5905
0.3217
0.2967
0.3487
7
0.58
-0.5447
0.5000
-0.3665
0.1996
0.2967
0.1343
8
0.67
-0.4005
0.5746
-0.1569
0.0628
0.1604
0.0246
9
0.67
-0.4005
0.6493
0.0466
-0.0187
0.1604
0.0022
10
0.75
-0.2877
0.7239
0.2523
-0.0726
0.0828
0.0636
11
0.83
-0.1863
0.7985
0.4713
-0.0878
0.0347
0.2221
12
1.08
0.0770
0.8731
0.7249
0.0558
0.0059
0.5256
13
2.17
0.7747
0.9478
1.0825
0.8386
0.6002
1.1717
S
9.75
-5.1788
6.5000
-6.9200
7.8443
4.4006
19.2459
r
0.8435
?
Contoh perhitungan index of fit distribusi weibull TTR komponen idler i = 1 :
x1
=
ln(t1 )
=
ln(0.42) = -0.8675
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