The authors are to be thanked for publishing results from their Swedish Navy funded work into frigate Survivability. Given the sensitivity of the subject, while there have been a lot of recently published articles on the topic of warship survivability, it is worthwhile to get a view from a navy still considering relatively small warships to be frigates. It is also very helpful to have a set of four “Survivability levels” (at end of Section 2.1) to gauge a design’s performance in this regard.
Choosing suitable survivability measures is a demanding task that has to start early in the ship design process. Throughout the design process there is a need for compromises that will define and sometimes limit future operations or capabilities. In this study generic survivability measures are compared. The study also examines the sensitivity of the calculated probabilities to changes in the threat description. The result shows that it is important to investigate the total effect of a hit over a set of relevant ship functions defined for example by survivability levels. The calculations for different threat definitions show that the changes in survivability are substantial when the threat definition is changed. Moreover, the effects of different hit assumptions differ between weapon types. This must be treated as an uncertainty which also should be reflected in the output and weighted into the decisions made, based on the survivability analysis.
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