BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

30 GheorgheNegru
iii) calculate the costs of failures C f (in monetary units/failure);
C = 1000.00 monetary units/failure ; (11)
f
iv) determine the expected frequency of failures δ f with the Weibull
distribution, (using Eqs. (4)–(8). The results of the calculus for the expected
frequency of failures are presented in Tables 4 and 5.
Table 4
Calculus results of the expected frequency of failures δ f
t f Ln(tfi) Afi 1/Ln(tfi)
Failure 1 5 1.609 0.748 0.621
Failure 2 7 1.945 0.618 0.514
Failure 3 3 1.098 1.096 0.91
Failure 4 6 1.791 0.672 0.558
Failure 5 2 0.693 1.736 1.443
Failure 6 5 1.609 0.748 0.621
Failure 7 3 1.098 1.096 0.91
Failure 8 3 1.098 1.096 0.91
Failure 9 7 1.945 0.618 0.514
Failure 10 7 1.945 0.618 0.514
Failure 11 2 0.693 1.736 1.443
Failure 12 4 1.386 0.868 0.721
Failure 13 5 1.609 0.748 0.621
Table 5
Calculus results of the expected frequency of failures δ f
t f Ln(tfi) Afi 1/Ln(tfi)
Failure 14 3 1.098 1.096 0.91
Failure 15 4 1.386 0.868 0.721
Failure 16 2 0.693 1.736 1.443
Failure 17 4 1.386 0.868 0.721
Failure 18 3 1.098 1.096 0.91
Failure 19 7 1.945 0.618 0.514
Failure 20 6 1.791 0.672 0.558
Failure 21 4 1.386 0.868 0.721
Failure 22 4 1.386 0.868 0.721
Failure 23 7 1.945 0.618 0.514
Failure 24 4 1.386 0.868 0.721
Failure 25 3 1.098 1.096 0.91
Failure 26 5 1.609 0.748 0.621
Failure 27 3 1.098 1.096 0.91
α = 2.016 , (12)
β = 4.027 , (13)