Briefly explain the concept of Reliability Block Diagram (RBD) of a system 2.Why is change to software system inevitable
1.Briefly explain the concept of Reliability Block Diagram (RBD) of a system
2.Why is change to software system inevitable?
Ans 1
An RBD is drawn as a series of blocks connected in parallel or series configuration. Parallel blocks indicate redundant subsystems or components that contribute to a lower failure rate. Each block represents a component of the system with a failure rate. RBDs will indicate the type of redundancy in the parallel path. For example, a group of parallel blocks could require two out of three components to succeed for the system to succeed. By contrast, any failure along a series path causes the entire series path to fail.
An RBD may be drawn using switches in place of blocks, where a closed switch represents a working component and an open switch represents a failed component. If a path may be found through the network of switches from beginning to end, the system still works.
An RBD may be converted to a success tree or a fault tree depending on how the RBD is defined. A success tree may then be converted to a fault tree or vice versa by applying de Morgan's theorem.
To evaluate an RBD, closed form solutions are available when blocks or components have statistical independence.
When statistical independence is not satisfied, specific formalisms and solution tools such as dynamic RBD have to be considered
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