» MTBF、MTTF 和 MTTR 的关系

MTBF、MTTF 和 MTTR 的关系

1960
在工程办公室分析 MTBF、MTTF 和 MTTR 的系统工程师。

(generate image for illustration only)

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
– Systems engineering

类型

抽象系统

中断

实质性

使用方法

广泛使用

前体

  • time and motion studies by frederick winslow taylor and the gilbreths
  • 发展 统计过程控制
  • early concepts of system downtime analysis in manufacturing
  • military logistics planning during major conflicts

应用

  • 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]

专利:

NA

潜在的创新想法

级别需要会员

您必须是!!等级!!会员才能访问此内容。

立即加入

已经是会员? 在此登录
Related to: mttf, mttr, mtbf, availability, repairable system, maintainability, reliability, service level agreement.

发表回复

您的邮箱地址不会被公开。 必填项已用 * 标注

迎接新挑战
机械工程师、项目、工艺工程师或研发经理
有效的产品开发

可在短时间内接受新的挑战。
通过 LinkedIn 联系我
塑料金属电子集成、成本设计、GMP、人体工程学、中高容量设备和耗材、精益制造、受监管行业、CE 和 FDA、CAD、Solidworks、精益西格玛黑带、医疗 ISO 13485

我们正在寻找新的赞助商

 

您的公司或机构从事技术、科学或研究吗?
> 给我们发送消息 <

接收所有新文章
免费,无垃圾邮件,电子邮件不分发也不转售

或者您可以免费获得完整会员资格以访问所有受限制的内容>这里<

历史背景

(如果日期不详或不相关,例如 "流体力学",则对其显著出现的时间作了四舍五入的估计)。

相关发明、创新和技术原理

滚动至顶部

你可能还喜欢