33
Nilai
Sifat
0< ß <1
Fungsi kerusakan menurun/decreasing failure rate (DFR).
ß
= 1
Fungsi
kerusakan
konstan/constant
failure
rate
(CFR).
Distribusi Eksponensial.
1< ß <2
Fungsi kerusakan
meningkat/Increasing failure rate (IFR).
Kurva berbentuk konkaf.
ß
= 2
Fungsi
kerusakan
linier/linier
failure
rate
(LFR).
Distribusi
Rayleigh.
ß
> 2
Fungsi kerusakan
meningkat/Increasing failure rate (IFR).
Kurva berbentuk konveks.
3=
ß
=4
Fungsi kerusakan
meningkat/Increasing failure rate (IFR).
Distribusi Normal Kurva berbentuk simetris
Tabel 2.1. Parameter Bentuk (ß) Distribusi Weibull
Sumber
:
Ebeling, C.E, An Introduction to Reliability and Maintainability
Engineering ,
Mc Graw-Hill, New York, 1997.
Gambar 2.2 Weibull reliability function
(a) Failure Density Function
(b) Cumulative Failure
(c) Hazard Rate
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