Which is for you?
MIL-HBK-217, FN2, Part Stress and Parts Count,
Telcordia SR332, Issue 1,2,3, "Reliability Prediction Procedure for Electronic Equipment"
Mechanical Parts Reliability Prediction Method
A primary component of reliability analysis is referred to as the failure rate, or the number of failures expected during a certain period of time. Calculation of equipment failure rate, and its inverse - the MTBF (Mean Time Between Failures), is the basis of the Reliability Prediction.
There are several different reliability models available, including MIL-HDBK-217 Part Stress and Parts Count, the Telcodia Reliability Prediction Method, and a Mechanical Parts reliability prediction method. Your choice of a reliability prediction model, or models, depends upon your application.
The Part Stress section of MIL-HDBK-217, the worldwide standard for electronic reliability analysis, allows you to take into account the various stress factors, such as power, voltage, and temperature, on your components. An extensive and widely used standard, MIL-HDBK-217 may be employed for any application.
The Parts Count is section of MIL-HDBK-217 is similar to Part Stress MIL-HDBK-217, except that it provides simpler reliability models by defaulting most of the part parameters contained in MIL-HDBK-217 to average values. The Parts Count analysis is especially useful in the early design phase of a product when the component and operating parameters may not be known.
The Bell Communications Research (Bellcore) reliability standard, TR-332, is titled "Reliability Prediction Procedure for Electronic Equipment". Now known as Telcordia SR332, the mathematical models in the Bellcore document, originally derived from MIL-HDBK-217, were modified for more general nonmilitary use. Telcordia is geared towards companies in the commercial arena. Telcordia also allows you to incorporate device burn-in data, unit burn-in data, data gained from laboratory testing, as well as information from actual field testing.
If your equipment is partially or completely comprised of mechanical components, reliability predictions based on the "Handbook of Reliability Prediction Procedures for Mechanical Equipment" is for you. Mechanical Parts includes reliability models for devices such as seals, springs, solenoids, bearings, gears, splines, valves, actuators, pumps, brakes, clutches, and more. Mechanical Parts can be seamlessly integrated with an electronic prediction for a complete electro-mechanical system analysis!
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Last modified: 2/01/14
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