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.