4.2 可恃性分析方法 (dependability analysis methods)

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章節分配表
4.2 Dependability analysis methods
The methods presented in this standard fall into two main categories:
- methods which are primarily used for dependability analysis;
- general engineering methods which support dependability analysis or add value to design for dependability.


The usability of the dependability analysis methods within the general dependability analysis tasks of the general analysis procedure is given in Table 1.  Table 2 gives more detailed characteristics.  The methods are explain briefly in Annex A.

Among the supporting or general engineering methods are (the list being not necessary exhausive):  - maintainability studies (covered by IEC 60300-3-10 in general and IEC 60706-2 in particular);
- sneak circuit analysis (A.2.1);
- worst case analysis (A.2.2);
- variation simulation modelling (A.2.3);
- software reliability engineering (A.2.4);
- finite element analysis (A.2.5);
- parts derating and selection (A.2.6);
- Pareto analysis (A.2.7);
- cause and effect diagrams (A.2.8);
- failure reporting and corrective action system (A.2.9)

It should also be noted that the methods are named and understood in the sense of the relevant IEC standards (where they exist).  The following methods have not been included as separate methods because they are derived from or closely related to primary methods:
- casue / consequence analysis is a combination of ETA and FTA;
- dynamic FTA is an extension of FTA, where certain events are expressed by Markov sub-models;
- functional failure analysis is a particular type of functional FMEA;
- binary decision diagrams are mainly used as an efficient representation of fault trees.



表 1：一般可恃性分析工作方發之使用 (use of methods for general dependability analysis tasks

分析方法	可恃性要求/目標之配當	定性分析	定量分析	審查與建議	附錄
失效率預估	適用於無複聯之並聯系統	可用於維護策略分析	計算電子元件與設備之失效率與 MTBF	支援	A.1.1
故障樹分析	若系統行為與時間或次序無關，可適用。	故障組合	計算系統可靠度、可用度，以及分系統對系統不可用度的相對貢獻度	適用	A.1.2