Residential Smoke Detector Reliability Handbook. Section 1:Parts Stress Analysis.

摘要

This Residential Smoke Detector Reliability Handbook is designed to provide a means for the accurate prediction of smoke detector failure rates in a residential environment. The methodology developed by which a smoke detector critical failure rate can be determined is divided into three major sections. Section 1.0contains the parts stress reliability prediction techniques for each major generic component type currently being used in residential smoke detectors,or exhibiting the potential for being in future designs. Section 2.0through the application of FMECA and/or FTA techniques,presents the guidelines for the determination of those components,and their associated failure modes,which are considered critical to the audible warning capabilities of the detector. The process of applying the predicted failure rates of Section 1.0to the FMECA/FTA guidelines of Section 2.0will result in a critical failure rate for residential smoke detectors; i.e. the rate at which failures that will not trigger the audible alarm circuitry may occur,thus negating the protective characteristics of the unit. Finally,Section 3.0discusses methods of screening for the predominant failure modes of those electronic components characterized as most critical to smoke detector operation,to efficiently detect and eliminate infant mortality failures.