Читать книгу System Reliability Theory - Marvin Rausand - Страница 119

A complicated item may have many operational modes, and one or more functions for each operational mode. Operational modes may include normal operating modes, test modes, transition modes, and contingency modes induced by failures or operator errors. The establishment of the different operational modes is recommended for two reasons:

1 It reveals functions that might be overlooked when focusing too much on the essential functions.

2 It provides a structured basis for identifying failure modes that are connected to, and dependent on, the given operational mode.

Operational modes are therefore an aid in identifying both functions and failure modes. Failure modes are discussed in Section 3.4.