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DNV-OS-C501 Composite Components

App.A: Check-lists for Design Input

E: Distribution types of basic variables

App.A
E. Distribution types of basic variables

From DNV Classification Notes - No. 30.6 - Table 2.1

App.A E

Table E1 Standard variables and corresponding distribution types
Variable name		Distribution type
Wind	Short-term instantaneous gust speed	Normal
	Long-term n-minute average speed	Weibull
	Extreme speed yearly	Gumbel
Waves	Short-term instantaneous surface elevation (deep-water)	Normal
	Short-term heights	Rayleigh
	Wave period	Longuet-Higgins
	Long-term significant wave height	Weibull
	Long-term mean zero upcrossing or peak period	Lognormal
	Joint significant height/mean zero upcrossing or peak period	3-parameter Weibull (height) / Log-normal period conditioned on height
	Extreme height yearly	Gumbel
Current	Long-term speed	Weibull
	Extreme yearly	Gumbel
Forces	Hydro-dynamic coefficients	Lognormal
Fatigue	Scale parameter on S-N curve	Lognormal
	Fatigue threshold	Lognormal
Fracture mechanics	Scale parameter on da/ dN curve	Lognormal
	Initial crack size	Exponential
	P.O.D. - curve	Lognormal
Properties	Yield strength (steel)	Lognormal
	Young's modulus	Normal
	Initial deformation of panel	Normal
Ship data	Still water bending moment	Normal
	Joint still water moment / draught	Joint normal
	Ship speed	Lognormal
	Model uncertainty of linear calculations	Normal