Reliability allocation

Decision Type: Objective

Method Category: Requirements, Set reliability targets

Categories: Methods

The process of breaking down system reliability and availability objectives to subsystems and major components. Reliability allocation specifies clearly stated reliability goals for all elements of an item. This information is useful when seeking suitable elements (parts or subsystems). It gives a means to compare the reliability performance of subsystems or elements to a specific and measurable objective.

Synonyms:

reliability apportionment

Reliability Allocations
3 Ways to do Reliability Allocation #5
Certificate in Reliability Statistics
Communicating Reliability Starts with Being Able to Quickly Define It
Colloquially, we jumble reliability with dependability, sureness, solidness, responsible, and trustworthiness. As we will see in this article, reliability engineers assign a specific meaning to reliability.
Reliability Apportionment

Reliability block diagram
A drawing with blocks for each element of a system and connecting lines representing the series, parallel, and more complex relationships between elements. Statistically, an RBD contains the probability of success (reliability) information for each block. For a single point in time (e.g., the warranty period), the probability may be a single number. The probability of success could also be a reliability function based on distributions or nonparametric models. RBDs provides a structure to perform reliability allocation and are also useful to gather reliability measurements to estimate system reliability or to identify elements for improvement priority.

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