Kim and Merciev 



NOMENCLATURE 



FOR MOTIONS RESPONSE OF THREE AND FOUR FLOAT 



PLATFORMS 



A coefficient in interim standard sea spectral formulation, Eq. (2) 



B coefficient in interim standard sea spectral formulation, Eq. (2) 



E variance for x* n mode of response of platform to irregular 



wave excitations, Eq. (6) 



E x dimensionless response variance, (e.g., Eq. 7) 



E. dimensionless response variance, Eq.(lO) 



GM metacentric height 



g acceleration of gravity 



H-j/3 significant wave height 



k impulse response function 



m Q variance of wave spectrum 



m^ first moment of wave spectrum about w= axis 



N number of occurrences of irregular response in given duration 



of time 



Prob probability of computed value of response being exceeded in a 

 given duration of time 



S^ wave elevation spectral density 



T-l 27rm /m-, , or observed characteristic period of waves 



t time, sec 



X dimensionless time, t Vg/v ' 



x average apparent response (crest-to-trough) in x mode 



{x)± /3 average of one-third highest responses, or "significant" re- 

 sponse 



(x) 1 / in average of one-tenth highest responses 



x calculated extreme value of response in x mode, Eq. (9) 



z heave motion 



a dimensionless response (transfer function) for x 1 mode, 



X Eq.(8a-f) 



V craft displaced volume 



f wave elevation 



856 



