Relyence RBD provides a fast, easy-to-use interface that allows you to quickly create your reliability block diagrams. The smart layout capability intelligently connects and organizes your diagram for optimal review. Modeling complex systems, especially those incorporating redundancy, has never been easier.
Relyence RBD provides a fast, easy-to-use interface that allows you to quickly create your reliability block diagrams. You simply insert blocks, assign images as desired, and intuitively arrange the blocks as you choose. You can quickly create series, hot standby, cold standby, and parallel configurations. And you can create sub-diagrams to organize large analyses, grouping the blocks as you desire, and navigating to them quickly using the tree structure that Relyence RBD maintains for you.
A simple click on a block shows the failure and repair properties for that block – allowing you to define the redundancy type, failure distribution, repair distribution, if applicable, and the properties of the distribution such as failure rate, mean and standard deviation, or MTTR. Adding blocks and setting properties is a snap with Relyence RBD.
Designing with redundancy is an important technique when system uptime is crucial. Building redundancy into your system in critical areas means that when a component or pathway fails, a backup takes over to keep your system operational. Many industries where high availability is of utmost importance rely on redundancy to meet their uptime goals. With Relyence RBD, you can model both redundant components and redundant branches (redundant paths in your system model). Relyence RBD includes support for the various types of redundancy:
- Series: A series configuration has no redundancy, and all components are connected in series and all must be operating for the system to successfully function.
- Cold Standby: Cold standby is defined as a number of identical components in a redundant configuration. Oftentimes, noted as k-out-of-n redundancy, indicating that a quantity (k) out of a total of (n) components are required for the system to operate. In cold standby, the standby components are not active and will not fail. Once a failure occurs, the standby unit is activated so that the system remains operational.
- Hot Standby: Similar to cold standby, however, the standby units are turned on. When a unit fails, the standby unit takes over.
- Parallel: In a parallel redundant configuration, all components are operating all the time and only the designated quantity is required to keep the system operating.
For redundant components, you can also include information on the Switch Probability and Switch Delay. Switch Probability is the likelihood the switchover to use a redundant component in order to prevent system failure will be successful. Switch Delay is the time it will take to switch over to a backup unit upon failure.
Failure and Repair Distributions
An important part of modeling your system is defining the failure and repair profiles of your components. In RBD analysis this is accomplished by selecting the appropriate distribution that matches your components’ characteristics. In Relyence RBD, you can select from various failure and repair distributions when modeling the failure and repair characteristics of your components. The distributions supported include:
- Constant Time
- Time Independent
Integration with Reliability Prediction
Using the Relyence platform enables you to use your reliability prediction analyses together with your RBD analyses for a useful and efficient combo pack. When defining the distributions of your system components, Relyence RBD enables you to link directly to the failure data from Relyence Reliability Prediction. You can link any component in your RBD to a component in your reliability prediction analysis. When performing calculations, the failure information from Relyence Reliability Prediction will be used in your RBD. To make things easy when viewing your RBD, any components in your diagram that are linked are shown in green.
Relyence RBD enables you to efficiently model complex diagrams by supporting subdiagram linking. Subdiagram links allow you to link a single block in one RBD to another diagram. For example, if you are modeling a system which is broken into three distinct units, you can construct an independent RBD for each of the three units, and then create a fourth diagram with three components linking to each independent RBD. Subdiagram linking is also advantageous for reuse – if you have an assembly used in more than one place, you only need to construct a single RBD then link to it as required. Linking to subdiagrams is done on the block properties pane in Relyence RBD, by simply selecting the subdiagram you want to link to from the autogenerated list of choices. Any blocks in your diagram that are linked are shown in green so they are easy for you to recognize.