Log-Likelihood = -83.221 Goodness-of-Fit
Anderson-Darling adjusted = 0.958 Correlation Coefficient = 0.977
Characteristics of Distribution Standard 95.0 Normal CI
Estimate Error Lower Upper MeanMTTF 18.7122 4.18289 12.0739 29.0002
Standard Deviation 19.9803 8.04023 9.07970 43.9676 Median 12.7910 2.37874 8.88394 18.4163
First QuartileQ1 7.10215 1.48609 4.71281 10.7029 Third QuartileQ3 23.0366 4.82029 15.2865 34.7158
Interquartile RangeIQR 15.9344 4.13966 9.57632 26.5139
Berdasarkan hasil perhitungan diatas, maka diperoleh nilai MTTF
komponen Beater PCD 80 mm 50x6x150 - Ø 17 mm sebesar 18,7122.
5.2.2.2. Perhitungan MTTF Komponen Beater PCD 80 mm 50x150x50 - Ø 17 mm
Berdasarkan hasil perhitungan goodness of fit, selang waktu antar kerusakan pada komponen Beater PCD 80 mm 50x150x50 - Ø 17 mm adalah
berdistribusi lognormal. Perhitungan MTTF dapat dilakukan secara manual dan dengan bantuan software. Hasil perhitungan secara manual dapat dilihat pada
Tabel 5.31.
Tabel 5.31. Perhitungan MTTF Komponen Beater PCD 80 mm 50x150x50 - Ø 17 mm
i Ti
ln ti u
ln ti-u
2
2
σ
1
2
0.693147 42.5625
1753.043 7081.995
2
3
1.098612 42.5625
1719.254 7081.995
3
4
1.386294 42.5625
1695.48 7081.995
4
8
2.079442 42.5625
1638.878 7081.995
5
10
2.302585 42.5625
1620.861 7081.995
6
12
2.484907 42.5625
1606.213 7081.995
7
13
2.564949 42.5625
1599.804 7081.995
8
15
2.70805 42.5625
1588.377 7081.995
Universitas Sumatera Utara
Tabel 5.31. Perhitungan MTTF Komponen … Lanjutan
i Ti
ln ti u
ln ti-u
2
2
σ
9
22
3.091042 42.5625
1557.996 7081.995
10
24
3.178054 42.5625
1551.135 7081.995
11
25
3.218876 42.5625
1547.921 7081.995
12
37
3.610918 42.5625
1517.226 7081.995
13
41
3.713572 42.5625
1509.239 7081.995
14
52
3.951244 42.5625
1490.829 7081.995
15
62
4.127134 42.5625
1477.277 7081.995
16
351
5.860786 42.5625
1347.016 7081.995
Total 681
46.06961 25220.55
Sumber : Pengolahan Data
- 5625
, 42
16 681
1
= =
= =
∑
= n
i
n ti
x µ
- t
med
= e
µ
= e
42,5625
= 3,13573
- s
2
= 1576,284
16 55
, 25220
ln
1 2
= =
−
∑
=
n ti
n i
µ
- s =
702 ,
39 284
, 1576
2
= =
s
4791 ,
43 2
995 ,
7081 5625
, 42
exp 2
exp
2
=
+
=
+ =
σ µ
MTTF
Perhitungan MTTF komponen Beater PCD 80 mm 50x150x50 - Ø 17 mm dengan bantuan software dapat dilihat sebagai berikut:
Distribution Analysis:
Beater PCD 80 mm 50x150x50 - Ø 17 mm
Censoring Information Count Uncensored value 16
Estimation Method: Least Squares failure timeX on rankY Distribution: Lognormal
Parameter Estimates Standard 95.0 Normal CI
Parameter Estimate Error Lower Upper Location 2.87935 0.334090 2.22455 3.53416
Scale 1.33636 0.266337 0.904229 1.97501
Universitas Sumatera Utara
Log-Likelihood = -72.274 Goodness-of-Fit
Anderson-Darling adjusted = 0.981 Correlation Coefficient = 0.981
Characteristics of Distribution Standard 95.0 Normal CI
Estimate Error Lower Upper MeanMTTF 43.4791 21.2246 16.7017 113.188
Standard Deviation 96.8782 82.5198 18.2466 514.364 Median 17.8027 5.94771 9.24929 34.2660
First QuartileQ1 7.22820 2.74183 3.43675 15.2024 Third QuartileQ3 43.8472 16.6323 20.8478 92.2198
Interquartile RangeIQR 36.6190 15.2924 16.1524 83.0187
Maka diperoleh nilai MTTF komponen Beater PCD 80 mm 50x150x50 - Ø 17 mm sebesar 43,4791.
5.2.2.2. Perhitungan MTTF Komponen Screen 695-1120-3D-Ø 6 mm
