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Uncertainty of estimated rainflow damage for random loads

Bengtsson Anders ; Klas Bogsjö ; Igor Rychlik (Institutionen för matematiska vetenskaper, matematisk statistik)
Marine Structures (0951-8339). Vol. 22 (2009), 2, p. 261-274.
[Artikel, refereegranskad vetenskaplig]

One way to assess the uncertainty in fatigue damage analysis is to use a so-called safety index. In the computation of such an index the coefficient of variation for the accumulated damage is needed. Employing the rainflow cycle count method for fatigue damage leads to, in most cases, complicated calculations. Here we present a new and simplified method to estimate the coefficient of variation for the accumulated damage when only one sample path of the load is available. Non-stationary, slowly changing, Gaussian loads are given special attention. The approach is illustrated by means of stationary Gaussian loads with nine different spectra, a measured non-Gaussian load, a skewed load and the wave load accumulated during one year in a "seasonally changing environment"

Nyckelord: Coefficient of variation; Damage variability; Rainflow damage



Denna post skapades 2010-01-12. Senast ändrad 2016-07-25.
CPL Pubid: 106686

 

Institutioner (Chalmers)

Institutionen för matematiska vetenskaper, matematisk statistik (2005-2016)

Ämnesområden

Tillämpad matematik
Matematisk statistik

Chalmers infrastruktur