Engineering Mechanics

Proceedings Vol. 8 (2002)

INŽENÝRSKÁ MECHANIKA 2002

ENGINEERING MECHANICS 2002

Copyright © 2002 Institute of Mechanics of Solids, Faculty of Mechanical Engineering, Bruno University of Technology, Brno

 

Rudolf Holub
pages 73 - +10p., full text

Frequently, a manufacturer will have to demonstrate that a certain product has met a goal of certain reliability at a given time with a specific confidence. Often, it will be desired to demonstrate that this goal has been met with a zero-failure test. In order to design and conduct such a test, something about the behaviour of the product will need to be known, e. g. the shape parameter of the product's life distribution. Beyond this, nothing more about the product and the test is known, and the engineer designing the test have to study the trade-offs between the number of units and amount of test time needed to demonstrate the desired goal. In cases like this, it is useful to show the possibilities of how a certain specification can be met. The methodology of such a demonstration requires not only the use of reasonable assumption of the distribution of the product lifetimes, but the distribution's shape parameter must be provided as well. Additional information that must be supplied include the reliability to be demonstrated, the confidence level at which the demonstration takes place, the acceptable number of failures, and either the number of available units or the amount of available test time. The output of this analysis can be the amount of time required to test the available units, or the required number of units that need to be tested during the available test time.

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