Thursday, December 23, 2010

FMEA-2

1.Determining the effects that any failure will have on other items in the product or process and their functions.
2.Determining those parts of the product or the process whose failure will have critical effects on product or operation (those producing the greatest damage), and which failure modes will generate these damaging effects.
3.Calculating the probabilities of failure in assemblies, sub-assemblies, products, and processes from the individual failure probabilities of their components and the arrangements in which they have been designed. Since components have more than one failure mode, the probability that one will fail at all is the sum of the total probability of the failure modes.
4.Establishing test program requirements to determine failure mode and rate data not available from other sources.
5.Establishing test program requirements to verify empirical reliability predictions.
6.Providing input data for trade-off studies to establish the effectiveness of changes in a proposed product or process or to determine the probable effect of modifications to an existing product or process.
7.Determining how the high-failure-rate components of a product or process can be adapted for higher-reliability components, redundancies, or both.
8.Eliminating or minimizing the adverse effects that assembly failures could generate and indicating safeguards to be incorporated if the product or the process cannot be made fail-safe or brought within acceptable failure limits.
9.Helping uncover oversights, misjudgments, and errors that may have been made.
10.Helping reduce development time and cost of manufacturing processes by eliminating many potential modes prior to operation of the process and by specifying the appropriate tests to prove the designed product.


11.Proving training for new employees.
12.Tracking the progress of a project.
13.Communicating to other professionals who may have similar problems

FMEA--Failure Mode Effect Analysis

FMEA is a “before – the – event” action requiring a team effort to easily and inexpensively alleviate changes in design and production

Reliability may be defined as the probability of the product to perform as expected for a certain period of time, under the given operating conditions, and at a given set of product performance characteristics.
One important consideration when performing reliability studies is the safety of the product or the process. The criticality of a product or process changes drastically when human safety considerations are involved. Reliability test and studies can form the basis for safety studies.

It is the engineer’s task to define all of the previously –stated items, and in many instances, the engineer has only past experience and personal knowledge of like systems to define these different aspects of failure accurately.