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失效模式、影响及其诊断分析(FMEDA)是从可靠性角度入手,通过电路机理分析,获得功能安全相关参数从而验证仪表的最大安全完整性等级(SIL)的重要手段。由于分析过程具有较强的主观因素、且需要多人协力完成,因此借助拥有海量数据的专用工具软件,采用合理的分析方法、正确的分析规程是提高分析效率、保证FMEDA结果准确的重要手段。本文在介绍FMEDA的实施方法与流程的基础上,采用自行研发的FMEDAenforcer软件对实际案例进行分析并与专著进行结果比较,验证该分析过程的正确性和计算结果的准确性。
Failure Modes, Effects and Their Diagnostic Analysis (FMEDA) are important ways to verify the maximum safety integrity level (SIL) of a device from the reliability point of view through circuit analysis and functional safety related parameters. Due to the strong subjective factors in the analysis process and the need for more than one person to work together, a reasonable analytical method is adopted with the help of a dedicated tool software with massive data. Correct analysis of the procedures is an important means to improve the analysis efficiency and ensure the accuracy of the FMEDA results. Based on the introduction of FMEDA implementation methods and procedures, this paper analyzes the actual cases by FMEDAenforcer software developed by ourselves and compares them with the results of monographs to verify the correctness of the analysis process and the accuracy of calculation results.