Use RBDs, Fault Trees or Markov Diagrams
Reliability Block Diagram (RBD) Configurations
BlockSim's interface for reliability block diagram (RBD) creation is the most intuitive, flexible and polished in the industry. Easy drag-and-drop techniques allow you to build RBDs for the simplest to the most complex systems. The software supports all of the following reliability-wise configuration types:
- Simple Series and Parallel: Simple series configurations assume that the failure of any one component causes the system to fail; while simple parallel configurations assume that the system continues to operate if any path succeeds.
[View RBD Example]
- Complex: Complex configurations require a more advanced analytical treatment than a simple combination of series and parallel blocks. Such configurations may be required for analyzing network systems, competing failure modes, etc.
[View RBD Example]
- k-out-of-n: Node blocks can be used to define
k-out-of-n redundancy, where a specified number of paths leading to the node must succeed in order for the system to succeed.
[View RBD Example]
- Load Sharing: In a load sharing configuration, each block supports a percentage of the total load. BlockSim now supports stress-independent distributions for load sharing blocks. [View RBD Example]
- Standby Redundancy: In a standby configuration, standby blocks are available to become active under specified circumstances. BlockSim can model hot, warm or cold standby configurations. [View RBD Example]
- Mirrored Blocks: Mirrored blocks allow you to put the exact same component in more than one location within the diagram. These blocks can be used, for example, to simulate bi-directional paths in a communications network. BlockSim now offers increased modeling flexibility by supporting mirrors across different diagrams. [View RBD Example]
- Multi Blocks: Multi blocks help you to save time (and space in the diagram) by using a single block to represent multiple identical components configured in series or parallel. [View RBD Example]
- Subdiagrams: BlockSim offers a virtually unlimited capability to link diagrams as components in other diagrams, which provides a variety of opportunities to encapsulate one analysis into another. [View RBD Example]
We have drastically increased BlockSim’s capability for encapsulation by allowing users to publish an analyzed diagram as a model that can be used in any other Synthesis analysis (e.g., in another BlockSim diagram or in the reliability/maintainability calculations supported by Xfmea or RCM++).
Fault Tree Analysis Configurations
BlockSim's fault tree analysis interface supports all of the traditional gates and event symbols that are applicable to system reliability and related analyses. In addition, only BlockSim allows you to expand the modeling capabilities with additional logic gates that represent load sharing and standby redundancy configurations.
- AND and OR gates
- NOT, NAND and NOR gates
- Voting gates
- Inhibit gates
- Priority AND and Sequence Enforcing gates
- Load Sharing and Standby gates (exclusively in BlockSim)
Now fault tree diagrams can be configured to display intermediate results at each individual gate (in addition to the results calculated for the top-level gate).
Your BlockSim projects can contain both fault trees and reliability block diagrams together in the same analysis workspace. You can also integrate your fault trees and RBDs by linking a fault tree as a subdiagram to an RBD or vice versa, copying events from a fault tree diagram and pasting them as blocks in an RBD, and automatically converting any fault tree to an RBD.
If supported by your license, you can now create both discrete and continuous Markov diagrams in BlockSim. Markov diagrams allow you to model the behavior of systems based on transitions between states, where the next state that the system enters is dependent only upon the current state (and not affected by any previous states). This gives you the ability to look at partial or degraded working states, and to start analysis in varying states. [See article "Using Markov Diagrams in BlockSim for Reliability Analysis"]
If you have both RENO and BlockSim, you can analyze a Markov diagram during RENO simulation and use the analysis result in your flowchart.