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how to identify the weakest link in a system

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Salamat ​

Sagot :

Answer:

It is said that a chain is only as strong as its weakest link. This suggests that the

weakest link in a chain is also the least valuable and most expendable link—a

liability to the system that should be reinforced, replaced, or removed. However,

the weakest element in a system can be used to protect other more important

elements, essentially making the weakest link one of the most important

elements in the system. For example, electrical circuits are protected by fuses,

which are designed to fail so that a power surge doesn’t damage the circuit.

The fuse is the weakest link in the system. As such, the fuse is also the most

valuable link in the system.

The weakest link in a system can function in one of two ways: it can fail and

passively minimize damage, or it can fail and activate additional systems that

actively minimize damage. An example of a passive design is the use of fuses in

electrical circuits as described above. An example of an active design is the use

of automatic sprinklers in a building. Sprinkler systems are typically activated by

components that fail (e.g., liquid in a glass cell that expands to break the glass

when heated), which then activate the release of the water.

Applying the weakest link principle involves several steps: identify a failure

condition; identify or define the weakest link in the system for that failure

condition; further weaken the weakest link and strengthen the other links as

necessary to address the failure condition; and ensure that the weakest link

will only fail under the appropriate, predefined failure conditions. The weakest

link principle is limited in application to systems in which a particular failure

condition affects multiple elements in the system. Systems with decentralized and

disconnected elements cannot benefit from the principle since the links in the

chain are not connected.

The weakest link in a system exists by design or by default—either way, it is

always present. Therefore, consider the weakest link principle when designing

systems in which failures affect multiple elements. Use the weakest link to shut

down the system or activate other protective systems. Perform adequate testing to

ensure that only specified failure conditions cause the weakest link to fail. Further

weaken the weakest element and harden other elements as needed to ensure the

proper failure response

Explanation:

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