Reliability Analysis of Car Subsystem by Weibull …
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0
10000
20000
30000
40000
50000
60000
70000
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
Distance before maintenance
(km)
Number of cars maintenance
Fig. 4 Front brake system
Table 11 Details of time to failure for front brake system
S. No. of cars
Distance before failure (km)
Time to failure (h)
2
50,000
833.33
5
60,000, 64,000
1000, 1066.67
6
38,000
633.33
12
44,000
733.33
13
58,000
966.67
14
21,000
350
15
32,000
533.33
Table 12 Median ranks of front brake system
S. No.
Time to failure (h)
Median ranks (%)
1
350
10.91
2
533.33
26.44
3
633.33
42.14
4
733.33
57.86
5
833.33
73.56
6
966.67
89.10
Table 13 Calculation table of front brake system
N
t
x = ln(t)
F(t)
y
x 2
y 2
x.y
1
350
5.85
0.1091
−2.158
34.22
4.657
−12.641
2
533.33
6.28
0.2644
−1.1806
39.44
1.3938
−7.410
3
633.33
6.451
0.4214
−0.603
41.61
0.3636
−3.889
4
733.33
6.60
0.5786
−0.146
43.56
0.0213
−0.9636
5
833.33
6.72
0.7356
+0.285
45.23
0.0812
+1.91
6
966.67
6.87
0.891
+0.796
47.19
0.633
+5.465
38.771
−3.006
251.25
7.1499
−17.53