可靠性方框图

[中文适用范围]： 本国际标准描述了： 在可靠性分析中使用可靠性框图（RBD）时适用的要求；使用可靠性框图对系统可靠性进行建模的程序；如何使用 RBD 进行定性和定量分析；使用 RBD 模型计算具有恒定（或时间相关）块成功/失败概率的不同类型系统以及未修复块或已修复块的可用性、故障频率和可靠性度量的程序；在进行可用性、故障频率和可靠性测量计算时的一些理论方面和局限性；与故障树分析（参见 IEC 61025 [1]）和马尔可夫技术（参见 IEC 61165 [2]）的关系。 [外文原描述]： IEC 61078:2016 this International Standard describes: - the requirements to apply when reliability block diagrams (RBDs) are used in dependability analysis; - the procedures for modelling the dependability of a system with reliability block diagrams; - how to use RBDs for qualitative and quantitative analysis; - the procedures for using the RBD model to calculate availability, failure frequency and reliability measures for different types of systems with constant (or time dependent) probabilities of blocks success/failure, and for non-repaired blocks or repaired blocks; - some theoretical aspects and limitations in performing calculations for availability, failure frequency and reliability measures; - the relationships with fault tree analysis (see IEC 61025) and Markov techniques (see IEC 61165). This third edition cancels and replaces the second edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - the structure of the document has been entirely reconsidered, the title modified and the content extended and improved to provide more information about availability, reliability and failure frequency calculations; - Clause 3 has been extended and clauses have been introduced to describe the electrical analogy, the "non-coherent" RBDs and the "dynamic" RBDs; - Annex B about Boolean algebra methods has been extended; - Annex C (Calculations of time dependent probabilities), Annex D (Importance factors), Annex E (RBD driven Petri net models) and Annex F (Numerical examples and curves) have been introduced. Keywords: reliability block diagram (RBD)