With regards to the motion of a stiff vessel, it’s not just big, quick rolls. Even in good weather the motion will throw the crew off balance. When I was on that cutter in Alaska my shins were always banged up from being thrown into things.
I’ve never heard of it till just now but it see in seakeeing it measured by “motion induced interruptions”, how many times a crew member is thrown off balance, trips or slips because of vessel motion.
This is from an article about the “Hero Class” patrol vessel:
The ergonomics of the kitchens are “compromised” and facilities need to be rearranged, the government has told potential contractors.
Ben Nelms/Bloomberg Ben Nelms/Bloomberg
The modifications will allow for safe cooking and will accommodate sudden movements of the vessels while conducting operations, industry officials have been told.
MOTION INDUCED INTERRUPTIONS AS SHIP OPERABILITY CRITERIA
An important goal of operability research is the development of quantitative seakeeping criteria to permit the effects of ship motions on operations to be assessed. This paper examines the problem of developing seakeeping criteria for deck operations. The lateral force estimator is generalized to permit frequency-domain computation of the incidence of personnel losing balance in the presence of non-zero vertical acceleration. The inadequacy of roll- angle based seakeeping criteria for deck operations is shown. Other possible criteria for deck operations are discussed, and it is concluded that a limit on the number of motion-induced interruptions during deck operations is most suitable, since it is platform- independent, and may now be computed in the frequency domain.