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derating curves. Later in the development when the circuit parameters are de ned, a stress level factor can be applied using actual design values to re ne the estimate. Employ Physical Models as the Basis for Reliability Estimates. On initial inspection, reliability modeling may appear to be a simple and straightforward procedure. SEs are tempted to employ functional models of the system as the basis for estimating reliability. However, recognize that the system functional model may not be an accurate reliability model. A model of the physical system provides the most accurate representation; the delity of the model depends on the application. A functional model of the system is necessary and serves as the basis for the reliability model. However, in most cases the two models will NOT be identical. In simple cases, the functional model may be adequate and actually serve as the initial reliability model. The reliability model nevertheless must account for any system redundancies, and any peculiarities such as component design and properties that might have impact on completion of the mission. Functional models MAY NOT suf ciently reveal this. Model Architectural Con guration Reliability. Reliability computations for any SYSTEM or entity are predicated on its physical architecture con guration at various levels of abstraction. At any level of abstraction, the SYSTEM/entity can be characterized by one of three types of constructs that are representative of various architectural network con gurations: 1) series, 2) parallel, and 3) series-parallel. Perform a FMEA/FMECA. Simply constructing reliability network models of system architectural elements provides some indication of system reliability. However, component failure effects range from nonthreatening to catastrophic. As a result, SEs need to understand HOW and in WHAT ways a system fails and WHAT the potential rami cations of that failure are to completing the mission. Human-made systems should undergo safety analysis to assess the risks and potential adverse impacts to the system, general public, and the environment. The safety analysis involves conducting a failure modes and effects analysis (FMEA). The purpose of the FMEA is to understand HOW a system or product and its components might fail because of misapplication, misuse, or abuse by operators or Users, poor design, or a single point of failure. One method for understanding HOW and in WHAT ways a system may fail is to create fault trees. Figure 50.11 provides an example of a simple remote controlled television system fault tree. Through FMEA, SEs employ compensating provisions such as redesign and procedural changes that enable cost-effective ways to mitigate the risks of failure mode effects. For systems that require high levels of reliability such as spacecraft and medical equipment, the FMEA may be expanded to include a criticality analysis of speci c component reliability and their effects. We refer to this as a failure modes, effects, and criticality analysis (FMECA). The FMEA should recommend cost effective, corrective action solutions referred to as compensating provisions to the system elements including PERSONNEL (skills/training), EQUIPMENT (design), and PROCEDURAL DATA (usage). The FMEA assesses design documentation such as functional block diagrams (FBDs), assembly drawings, schematics, Engineering Bill of Materials (EBOM), and fault trees to identify and prioritize areas that may be prone to failure and their associated level of impacts on the system. Identify Reliability Critical Items (RCIs). The FMEA and FMECA should analytically identify reliability critical items (RCIs) that require speci cation, selection, and oversight. Consider the following example:
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TV Fails to TV Fails to Turn ON Turn ON OR Front Panel Power Front Panel Power Switch Fails to Switch Fails to Activate TV Activate TV Remote Control Remote Control Fails to Activate TV Fails to Activate TV Note: Due to space restrictions, remote control distance from Sensor not shown.
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