instantaneous failure rate
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).
- Used by classes
- 1
Also appears in1#
Entities with the same name in other dictionaries:
- Code
ADA196- Data type
- REAL_MEASURE_TYPEmeasure
- Unit
- UAA000 UAA000
Version history1#
IEC CDD records every published revision of each entity — version number, status, timestamp, and the change request that introduced it. OpenCDD captures the full chain of custody from cdd.iec.ch; the entry marked Current is the one rendered on this page.
All properties20#
- Version
- 1
- Revision
- 1
- Preferred name
- instantaneous failure rate
- 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).
- Definition source
- IEV 192-05-06:2015-02
- 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).
- Definition class
- 0112/2///61360_4#ADA214measures for reliability related concepts
- Unit structure
- %
- Drawing reference
- NR2..3.3
- Initial value
- 0112/2///62720#UAA000 UAA000
- Published in
- NON_DEPENDENT_P_DET
- Status level
- Standard
- Version release date
- 2019-05-27
- Revision release date
- 2019-05-27
- Version initiation date
- 2019-05-27
- MDC_P022
- REAL_MEASURE_TYPE
- MDC_P040
- R51