TS EN 61703
Mathematical expressions for reliability, availability, maintainability and maintenance support terms
IEC 61703:2016 provides mathematical expressions for selected reliability, availability, maintainability and maintenance support measures defined in IEC 60050192:2015. In addition, it introduces some terms not covered in IEC 60050-192:2015. They are related to aspects of the system of item classes (see hereafter). According to IEC 60050-192:2015, dependability [192-01-22] is the ability of an item to perform as and when required and an item [192-01-01] can be an individual part, component, device, functional unit, equipment, subsystem, or system. To account for mathematical constraints, this standard splits the items between the individual items considered as a whole (e.g. individual components) and the systems made of several individual items. It provides general considerations for the mathematical expressions for systems as well as individual items but the individual items which are easier to model are analysed in more detail with regards to their repair aspects. This standard is mainly applicable to hardware dependability, but many terms and their definitions may be applied to items containing software. This second edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – standard made as self containing as possible; – item split between individual items and systems; – generalization of the dependability concepts for systems made of several components [introduction of the conditional failure intensity (Vesely failure rate); – introduction of the state-transition and the Markovian models; – generalization of the availability to production availability]; – introduction of curves to illustrate the various concepts. Keywords: mathematical expressions for dependability
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- Language: English
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About This Item
TS EN 61703 is a standard focused on the mathematical expression of reliability, availability, maintainability and maintenance support concepts. Its purpose is to provide a common quantitative language for describing how an item or system performs, remains ready for use, recovers from failure, and is supported through maintenance resources. In dependability engineering, that shared language matters because the same everyday term can mean different things unless it is tied to precise mathematical definitions.
What the standard brings together
According to the supplied scope, IEC 61703:2016 gives mathematical expressions for selected measures defined in IEC 60050-192:2015 and also introduces some additional terms not covered there. A key technical distinction is the split between individual items considered as a whole and systems made up of several individual items. That separation reflects real modelling differences: a single component can often be described with simpler repair and failure assumptions, while a multi-component system may require state-based or conditional representations.
General technical context
In general engineering use, reliability relates to the ability to perform required functions under stated conditions; availability describes whether the item is in an operable state when needed; maintainability concerns how quickly and effectively it can be restored after failure; and maintenance support covers the organizational and logistical means that make maintenance possible. This standard is mainly applicable to hardware dependability, although many of its terms and definitions can also be used for items containing software. The edition also extends the conceptual toolkit with state-transition and Markovian models, conditional failure intensity, and illustrations that help interpret the relationships between the concepts.
- This is the second edition and it replaces the first edition published in 2001.
- It generalizes dependability concepts for systems made of several components.
- It introduces production availability as a broader availability concept.
- It is designed to be as self-contained as possible, with added curves and explanatory models.
- Publication Date: 9.01.2017
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 03.120.30 İstatistiksel Metotların Uygulanması; 21.020 Makina, Cihaz ve Ekipmanların Özellikleri ve Tasarımı
- Pages: 217
- Source Standard: EN 61703:2016
- International Equivalents: EN 61703-EQV; IEC 61703-EQV
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