tailieunhanh - Engineering Statistics Handbook Episode 10 Part 6

Tham khảo tài liệu 'engineering statistics handbook episode 10 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . How can you evaluate reliability from the bottom-up component failure mode to system failure rate ENGINEERING STATISTICS HANDBOOK hW tools raids search BACK Nixf 8. Assessing Product Reliability . Introduction . How can you evaluate reliability from the bottom-up component failure mode to system failure rate Several simple models can be used to calculate system failure rates starting with failure rates for failure modes within individual system components This section deals with models and methods that apply to non-repairable components and systems. Models for failure rates and not repair rates are described. The next section covers models for repairable system reliability growth. We use the Competing Risk Model to go from component failure modes to component failure rates. Next we use the Series Model to go from components to assemblies and systems. These models assume independence and first failure mode to reach failure causes both the component and the system to fail . If some components are in parallel so that the system can survive one or possibly more component failures we have the parallel or redundant model. If an assembly has n identical components at least r of which must be working for the system to work we have what is known as the r out of n model. The standby model uses redundancy like the parallel model except that the redundant unit is in an off-state not exercised until called upon to replace a failed unit. This section describes these various models. The last subsection shows how complex systems can be evaluated using the various models as building blocks. NIST SEMATECH HOME TOOLS AID S SEARCH BACK NEXT http div898 handbook apr section1 5 1 2006 10 41 49 AM Competing risk model Multiply reliabilities and add failure rates k 2 1 2 1 k 2 1 Think of the competing risk model in the following way All the failure mechanisms are having a race to see which can reach failure first. They are not allowed to .