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Uncertainty of estimated rainflow damage for random loads

Författare och institution:
Bengtsson Anders (-); Klas Bogsjö (-); Igor Rychlik (Institutionen för matematiska vetenskaper, matematisk statistik, Chalmers/GU)
Publicerad i:
Marine Structures, 22 ( 2 ) s. 261-274
ISSN:
0951-8339
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2009
Språk:
engelska
Sammanfattning (abstract):
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"
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Matematik ->
Beräkningsmatematik ->
Tillämpad matematik
NATURVETENSKAP ->
Matematik ->
Sannolikhetsteori och statistik ->
Matematisk statistik
Nyckelord:
Coefficient of variation; Damage variability; Rainflow damage
Postens nummer:
106686
Posten skapad:
2010-01-12 15:14
Posten ändrad:
2016-07-25 09:15

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