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Availability of series component = (availability of component A) x (availability of component B) x (availability of component C) [2] [3] Therefore, combined availability of multiple components in a series is always lower than the availability of individual components. On the other hand, following formula applies to parallel components:
Availability is the probability that a system will work as required when required during the period of a mission. The mission could be the 18-hour span of an aircraft flight. The mission could be the 18-hour span of an aircraft flight.
Operational availability in systems engineering is a measurement of how long a system has been available to use when compared with how long it should have been available to be used. Definition [ edit ]
The availability factor of a power plant is the duration it achieves production of electricity divided by the duration that it was planned to produce electricity. In the field of reliability engineering , availability factor is known as operational availability , A o {\displaystyle A_{o}} .
Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a mechanical or electronic system during normal system operation. MTBF can be calculated as the arithmetic mean (average) time between failures of a system.
Availability Every request received by a non-failing node in the system must result in a response. This is the definition of availability in CAP theorem as defined by Gilbert and Lynch. [1] Note that availability as defined in CAP theorem is different from high availability in software architecture. [5] Partition tolerance
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Example of OEE and Six Loss calculation. To be able to better determine the sources of the greatest loss and to target the areas that should be improved to increase performances, these categories (Availability, Performance and Quality) have been subdivided further into what is known as the 'Six Big Losses' to OEE. These are categorized as follows: