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PROPERTY |
Code: |
0112/2///61360_4#ADA196 |
Version: |
001 |
Revision: |
01 |
IRDI: |
0112/2///61360_4#ADA196#001 |
Preferred name: |
instantaneous failure rate |
Synonymous name: |
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Symbol: |
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Synonymous symbol: |
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Short name: |
λ(t) |
Definition: |
limit, if it exists, of the quotient of the conditional probability that the failure of a non-repairable item occurs within time interval (t, t + Δt) by Δt, when Δt tends to zero, given that failure has not occurred within time interval (0, t)
λ(t)=limΔt→01Δt F(t+Δt)–F(t)R(t)=f(t)R(t)
λ(t)=limΔt→01Δt F(t+Δt)–F(t)R(t)=f(t)R(t)
where F(t) and f(t) are, respectively, the distribution function and the probability density at the failure instant, and where R(t) is the reliability function, related to the reliability R(t1, t2) by R(t) = R(0, t). |
Note: |
Note 1 See IEC 61703, Mathematical expressions for reliability, availability, maintainability and maintenance support terms, for more detail.
Note 2 Other terms used for instantaneous failure rate are: “hazard function”; “hazard rate”; and “force of mortality” (abbreviation FOM). |
Remark: |
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Primary unit: |
% |
Alternative units: |
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Level: |
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Data type: |
REAL_MEASURE_TYPE
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Format: |
NR2..3.3 |
Property constraint: |
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Definition source: |
IEV 192-05-06:2015-02 |
Property data element type: |
NON_DEPENDENT_P_DET |
Drawing: |
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Formula: |
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Value list code: |
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Value list: |
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DET class: |
R51 - percentages/ratios related to goods in situations |
Applicable classes: |
0112/2///61360_4#ADA214 - measures for reliability related concepts |
Definition class: |
0112/2///61360_4#ADA214 |
Code for unit: |
0112/2///62720#UAA000 - percent |
Codes for alternative units: |
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Code for unit list: |
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Status level: |
Standard |
Is deprecated: |
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Published in: |
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Published by: |
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Proposal date: |
2019-05-27 |
Version initiation date: |
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Version release date: |
2019-05-27 |
Revision release date: |
2019-05-27 |
Obsolete date: |
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Responsible Committee: |
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Conditions: |
-
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Change request ID: |
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Version history: |
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