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» MTBF, MTTF 및 MTTR 간의 관계

MTBF, MTTF 및 MTTR 간의 관계

1960
엔지니어링 사무실에서 MTBF, MTTF, MTTR을 분석하는 시스템 엔지니어.

(설명을 위한 생성된 이미지입니다)

For repairable systems, Mean Time Between Failures (MTBF) is the sum of Mean Time To Failure (MTTF) and Mean Time To Repair (MTTR). The formula is [latex]MTBF = MTTF + MTTR[/latex]. MTTF represents the average operational time before a failure, while MTTR is the average time taken to repair the system. This distinction is critical for understanding system availability.

The relationship [latex]MTBF = MTTF + MTTR[/latex] clarifies the full cycle of a repairable system’s life. MTTF (Mean Time To Failure) is the average duration a system operates successfully. MTTR (Mean Time To Repair) is the average time spent in a non-operational state, from the moment of failure until the system is restored to full functionality. This repair time includes fault detection, diagnosis, technician travel, sourcing parts, the actual repair, and verification.

This decomposition is vital for improving system availability. Availability, often expressed as a percentage, can be calculated as [latex]A = frac{MTTF}{MTTF + MTTR} = frac{MTTF}{MTBF}[/latex]. To increase availability, one can either increase the MTTF (make the system more reliable) or decrease the MTTR (make repairs faster). For many complex systems, such as a telecommunications network, reducing MTTR through rapid diagnostics and automated recovery is often more feasible than dramatically increasing the inherent reliability (MTTF) of every component.

For non-repairable items, such as a light bulb, the concept of MTTR is irrelevant. Once they fail, they are discarded. Therefore, their reliability is characterized solely by MTTF. The term MTBF is sometimes used interchangeably with MTTF, especially where MTTR is negligible, but this is technically incorrect.

UNESCO Nomenclature: 2212
시스템 엔지니어링

유형

추상 시스템

분열

상당한

용법

널리 사용됨

전구체

  • time and motion studies by frederick winslow taylor and the gilbreths
  • development of statistical process control
  • early concepts of system downtime analysis in manufacturing
  • military logistics planning during major conflicts

응용 프로그램

  • service level agreement (sla) definition for it services
  • logistics and spare parts management
  • design of fault-tolerant systems
  • calculating system availability [latex]A = MTTF / (MTTF + MTTR)[/latex]

특허:

NA

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Related to: mttf, mttr, mtbf, availability, repairable system, maintainability, reliability, service level agreement.

역사적 맥락

MTBF, MTTF 및 MTTR 간의 관계

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