|
The letters FMEDA form an acronym for "Failure Modes Effects and Diagnostic Analysis." The name was given by Dr. William M. Goble in 1994 to describe a systematic analysis technique that had been in development since 1988 by Dr. Goble and other engineers now at exida to obtain subsystem / product level failure rates, failure modes and diagnostic capability (Figure 1). The FMEDA technique considers * All components of a design, * The functionality of each component, * The failure modes of each component, * The impact of each component failure mode on the product functionality, * The ability of any automatic diagnostics to detect the failure, * The design strength (de-rating, safety factors) and * The operational profile (environmental stress factors). Given a component database calibrated with field failure data that is reasonably accurate , the method can predict product level failure rate and failure mode data for a given application. The predictions have been shown to be more accurate than field warranty return analysis or even typical field failure analysis given that these methods depend on reports that typically do not have sufficient detail information in failure records.〔W. M. Goble, "Field Failure Data – the Good, the Bad and the Ugly," exida, Sellersville,PA ()〕 == FMEA/FMECA == A Failure Modes and Effects Analysis, FMEA, is a structured qualitative analysis of a system, subsystem, process, design or function to identify potential failure modes, their causes and their effects on (system) operation. The concept and practice of performing a FMEA, has been around in some form since the 1960s. The practice was first formalized in 1970s with the development of US MIL STD 1629/1629A. In early practice its use was limited to select applications and industries where cost of failure was particularly high. The primary benefits were to qualitatively evaluate the safety and reliability of a system, determine unacceptable failure modes, identify potential design improvements, plan maintenance activities and help understand system operation in the presence of potential faults. The Failure Modes, Effects and Criticality Analysis, FMECA, was introduced to address a primary barrier to effective use of the detailed FMEA results by the addition of a criticality metric. This allowed users of the analysis to quickly focus on the most important failure modes/effects in terms of risk. This allowed prioritization to drive improvements based on cost / benefit comparisons. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Failure Modes, Effects, and Diagnostic Analysis」の詳細全文を読む スポンサード リンク
|