project - PROJECT SEMINAR ON FAILURE MODE EFFECT ANALYSIS...

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Unformatted text preview: PROJECT SEMINAR ON FAILURE MODE EFFECT ANALYSIS BY R. SRIKANTH (02-05-755) B. CHAITANYA (02-05-723) GUIDE: HARAGOPAL INTRODUCTION Failure Mode Effect Analysis is the process of identifying the likely causes of failure (failure mode) in a design, product or system. Once failure modes have been identified, a Risk Priority Number (RPN) is calculated based by assigning probabilities to the above factors, on a scale of 1 to 10. Guides to assigning scores are available. Corrective action is then taken according to the RPN priorities. In FMEA, Failures are prioritized according to how serious their consequences are, how frequently they occur and how easily they can be detected. An FMEA also documents current knowledge and actions about the risks of failures, for use in continuous improvement. FMEA is used during the design stage with an aim to avoid future failures. Later it’s used for process control, before and during ongoing operation of the process. Ideally, FMEA begins during the earliest conceptual stages of design and continues throughout the life of the product or service.Traditionally, reliability has been achieved through extensive testing and use of techniques such as probabilistic reliability modeling. These are techniques done in the late stages of development. The technique helps identify failure potential in a design or process i.e. to foresee failure before it actually happens. This is done by following a procedure which helps to identify design features or process operations that could fail. The procedure requires the identification of: All potential failures. The causes of those failures (there may be several) The effects of those failures (there may be several) Using knowledge of the design or the process, estimates of the probability of these failures due to each cause can be identified, together with the severity of the effects of the failure and the probability of detecting the failure before it becomes critical. But to achieve greatest value, FMEA should be done before a process failure has been unknowingly planned in to the product. Failure mode effect analysis can find weaknesses in product designs and manufacturing processes before a new product has launched. FMEAs also capture historical information for use in future product improvement. It is used in many formal quality systems such as QS-9000 or ISO/ TS 16949. The basic process is to take a description of the parts of a system, and list the consequences if each part fails. History The FMEA discipline was developed in the United States Military. Military Procedure MIL-P-1629, titled Procedures for Performing a Failure Mode, Effects and Criticality Analysis, is dated November 9, 1949. It was used as a reliability evaluation technique to determine the effect of system and equipment failures. Failures were classified according to their impact on mission success and personnel/equipment safety....
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This note was uploaded on 07/18/2010 for the course ME 520 taught by Professor Pradosh during the Spring '10 term at Binghamton.

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project - PROJECT SEMINAR ON FAILURE MODE EFFECT ANALYSIS...

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