RAM Commander User Manual

Reliability Block Diagrams

Reliability Block Diagrams

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Reliability Block Diagrams

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RAM Commander’s Reliability Block Diagram (RBD) module allows you to quickly and easily define and compute scenarios for reliability, availability and mean time between critical failures (MTBCF). You can use analytic or simulation techniques to evaluate RBDs. Analytical techniques are possible for most configurations. When such analyses are not possible, you can use RAM Commander’s built-in Monte Carlo simulation engine to evaluate the RBD scenario.

 

RBD Module features:

Graphical representaton of a block diagram
Link to Reliability/Maintainability/FMECA modules
Calculation of Availability, Reliability, R(t), MTBCF
Monte-Carlo simulation
oSeries
oComplex reliability configurations, including standby, partially loaded  (warm) and active redundancy
oFull or restricted repair with non-exponential distribution of time-to-repair
oNon-exponential distribution of time-to-failure (Normal, Weibull, etc.)
oAnalysis under Non-steady, transient state
oAnalysis of periodical inspection policy
oSplited K-out-of-N
oK-out-of-N with non ideal switch
Nested RBDs (Sub-RBD)
All types of reliability configurations are supported by RBD module:
oSeries
oParallel
oK out of N:  * active redundancy (hot), stand-by (cold), partially loaded (warm);
owith repair, without repair, with restricted repair.
All common distributions of time to failure and time to repair are available:
oExponential
oNormal
oLog-Normal
oWeibull
oErlang
oUniform and others
Interactive graphic editor with “Drag and Drop” feature providing intuitive display and convenient manipulation tools for creating of any RBD configuration
Simple and fast transfer of reliability and maintainability item data to the RBD module by selecting the target and source items on the graphic RBD screen.
Flexible zoom, color palette, direct printing of any RBD configuration
Database for each element includes:
oidentification parameters: ref. des., part number, description, etc.
otype of time-to-failure distribution and corresponding parameters (e.g., MTBF, Sigma, etc.)
otype of time-to-repair distribution and corresponding parameters