AS IEC 61165 pdf download

AS IEC 61165 pdf download Application of Markov techniques
scope
This International Standard provides guidance on the application of Markov techniques tomodel and analyze a system and estimate reliability, availability，maintainability and safetymeasures.
This standard is applicable to all industries where systems, which exhibit state-dependentbehaviour, have to be analyzed. The Markov techniques covered by this standard assumeconstant time-independent’state transition rates. Such techniques are often calledhomogeneous Markov techniques.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references,only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
References to international standards that are struck through in this clause are replaced byreferences to Australian or Australian/New Zealand Standards that are listed immediatelythereafter and identified by shading.Any Australian or Australian/New Zealand Standard thatis identical to the International Standard it replaces is identified as such.
IEC 60050(191):1990,International Electrotechnical Vocabulary (IEV) – Chapter 191:Dependability and quality of service
IEC 60300-3-1:Dependability management – Part 3-1:Application guide – Analysis techniquesfor dependability: Guide on methodology
AS IEC 60300.3.1,Dependability management—Application guide—Analysis techniques fordependability-Guide on methodology
IEC61508-4:1998,Functional safety of electrical/electronic/programmable electronic safety-related systems – Part 4 : Definitions and abbreviations
3Terms and definitions
For the purposes of this document,the terms and definitions given in IEC 60050(191):1990and the following apply.
NOTE To facllitate the application of this standard for safety evaluations, the terminology from IEC 61508 is usedwhere appropriate.
3.1
system
set of interrelated or interacting elements
[ISO 9000, 3.2.1 ]
NOTE 1 In the context of dependability, a system will have a defined purpose expressed in terms of intended functions, stated conditions of operation/use, and defined boundaries.
NOTE 2 The structure of a system may be hierarchical.
3.2
element
component or set of components, which function as a single entity
NOTE An element can usually assume only two states: up or down (see 3.4 and 3.5). For convenience the term element state will be used to denote the state of an element.
3.3
system state
X(t)
particular combination of element states
NOTE X(t) is the state of the system at time t. There are other factors that may have an effect on the system state (e. g. mode of operation).
3.4
up state
system (or element) state in which the system (or element) is capable of performing the required function
NOTE A system can have several distinguishable up states (e.g. fully operational states and degraded states).