Abstract
Design for Safety (DFS), Goal Based Standards (GBS) and Formal Safety Assessment (FSA) are powerful tools which establish a framework for integrating stability into a risk based design process. They provide a foundation for the development of novel designs which can provide insight that is not attainable through any other means. Naval ships are complex systems, sometimes operating in an environment defined by risk acceptance and risk taking beyond those of their commercial counterparts. The hazards seen by a naval ship in its service life may not be foreseen during design. The development of a design for safety process for naval ships should be capable of reflecting the nature of the military mission. Concurrently, there is certain fidelity inherent in the process that should be carefully defined. Three cases to categorize the risk assessment ‘fidelity’ are defined and discussed. These highlight the dangers of overstating and understating risk. Lastly the challenges of defining intact and damage stability risk in light of the sensitivity to the state of knowledge for naval ships are discussed.
The opinions expressed in this paper are those of the author and not necessarily those of the Naval Sea Systems Command or the United States Navy.
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Notes
- 1.
Last words of General Sedgwick, USA,—Spoken after rebuking his subordinates for taking cover, shortly before being killed by Confederate sharpshooter at Spotsylvania Courthouse. One could say he incorrectly assessed his probability of being hit as nil; perhaps the result of ignorance of the sharpshooter’s true likelihood of hitting the target. Other “experts” around had disagreed and took steps to mitigate the risk—which the General adamantly felt were unnecessary. Unfortunately he couldn’t revise his estimate later.
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Acknowledgements
Several people were instrumental in helping guide the direction of this paper; Prof. D. Vassalos for his guidance in discussing risk based ship design, Mr. D. Tellet, Dr. V. Belenky , Prof. B. Ayyub and Captain J. McTigue .
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Alman, P.R. (2019). Thoughts on Integrating Stability into Risk Based Methods for Naval Ship Design. In: Belenky, V., Spyrou, K., van Walree, F., Almeida Santos Neves, M., Umeda, N. (eds) Contemporary Ideas on Ship Stability. Fluid Mechanics and Its Applications, vol 119. Springer, Cham. https://doi.org/10.1007/978-3-030-00516-0_55
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