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FMEA

FMEA. Course Updates. Today - Introduction to FMEA No class on Thursday - work on your projects Next Tuesday - Personal Development Christmas Break Class will resume on Thursday, January 24. What is FMEA?. Failure Modes Effects Analysis -See page 551 of your book. Reasons to do FMEA.

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FMEA

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  1. FMEA ME410/411 Senior Design

  2. Course Updates • Today - Introduction to FMEA • No class on Thursday - work on your projects • Next Tuesday - Personal Development • Christmas Break • Class will resume on Thursday, January 24 ME410/411 Senior Design

  3. What is FMEA? • Failure • Modes • Effects • Analysis • -See page 551 of your book ME410/411 Senior Design

  4. Reasons to do FMEA • Define and guide a logical design process • Identify, quantify, and reduce design risk • Provide a traceable document for design and development • Justify design activities • Provide a means for continuous product improvement ME410/411 Senior Design

  5. Scope of FMEA • The FMEA is a team function • All team members must participate • Multi-disciplinary expertise and input is beneficial • Input from all engineering fields is desirable • Representatives from all areas (not just technical disciplines) are generally included as team members • The DFMEA is not a one meeting activity • The DFMEA will be refined and evolve with the product • Numerous revisions are required to obtain the full benefit of the DFMEA • The DFMEA should include all systems, sub-systems, and components in the product design ME410/411 Senior Design

  6. FMEA Methodology • List items and functions • Start with the system, then subsystems, and finally components • Document potential failure modes • How could the design potentially fail to meet the design intent? • Note: this might be the cause of failure at a higher level (i.e. component to subsystem) or the effect of a failure at a lower level. • Consider all types of failure • Document the potential effects of failure - How would the design potentially fail to meet the design intent? ME410/411 Senior Design

  7. FMEA Methodology • Rate the severity of the failure effect • Document potential causes and mechanisms of failure Potential failure modes are the consequences of the failure causes • A single failure mode may have multiple failure mechanisms • Use group brainstorming sessions to identify possible failure mechanisms • Do not be afraid to identify as many potential causes as you can • This section of the DFMEA will help guide you in necessary design changes • The output of the DFMEA will indicate on which item to focus design efforts ME410/411 Senior Design

  8. FMEA Methodology • Rate the occurrence • Are any elements of the design related to a previous device or design? • How significant are the changes from a previous design? • List the design controls, which are intended to: • Prevent the cause of the failure mode • Detect the cause of the failure mode • Detect the failure mode directly • Applicable design controls include: • Predictive code analysis, simulation, and modeling ･ Tolerance stack-upstudies ･ Prototype test results ME410/411 Senior Design

  9. FMEA Methodology • Repeat: undertake the next revision of the FMEA • Your FMEA is an evolving document! (as is a QFD) • Revise your FMEA frequently! • Diligence will eliminate design risk! • Include documentation of your results! ME410/411 Senior Design

  10. Frequency Ranking ME410/411 Senior Design

  11. Severity Rankings ME410/411 Senior Design

  12. Classification of “Risk” High Risk Possibility Of Occurrence Moderate Risk Severity of Outcome ME410/411 Senior Design

  13. FMEA (Failure Mode and Effects Analysis) • Method for analyzing the causes and effects of failures. • Highlights designs and assemblies most likely to cause failures. • Helps identify and prioritize corrective action • Indicates where the most improvement in terms of severity, frequency, and detectability can be made. • Widely used manufacturing technique (Mil standards, SAE, ANSI Specs) ME410/411 Senior Design

  14. Course Schedule • Failure Modes and Effects Analysis (FMEAplus): Software developed by Ford Motor Company. An FMEA can be described as a systemized group of activities intended to: (a) recognize and evaluate the potential failure of a product/process and its effects, (b) identify actions which could eliminate or reduce the chance of the potential failure occurring, and (c) document the process. It is complementary to the design process of defining positively what a design must do to satisfy the customer. ME410/411 Senior Design

  15. Course Schedule ME410/411 Senior Design

  16. Course Schedule ME410/411 Senior Design

  17. Course Schedule • No class on Tuesday Nov. 13 • Thursday Nov. 15 • More team Q&A: • Formula team • Ethanol team • LANL-controls team ME410/411 Senior Design

  18. Course Schedule • No class on Tuesday Nov. 13 • Thursday Nov. 15 • More team Q&A: • Formula team • Ethanol team • LANL-controls team ME410/411 Senior Design

  19. Steps in the Process • QFD’s • If you have not done one yet, you should start one • If you did one for the proposal, you should update it with new information • A QFD expands as you get new data • New customer requirements • New engr. Specs • New benchmarks ME410/411 Senior Design

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