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Uncertainty of estimated rainflow damage for random loads

Bengtsson, Anders; Bogsjö, Klas LU and Rychlik, Igor (2009) In Marine Structures 22(2). p.261-274
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... (More)
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". (C) 2008 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Coefficient of variation, Rainflow damage, Damage variability
in
Marine Structures
volume
22
issue
2
pages
261 - 274
publisher
Elsevier
external identifiers
  • wos:000265151000010
  • scopus:61849162217
ISSN
1873-4170
DOI
10.1016/j.marstruc.2008.05.001
language
English
LU publication?
yes
id
059c5d4d-021e-4538-8dfb-4f73e9bc15a3 (old id 1400202)
date added to LUP
2009-06-15 14:37:19
date last changed
2017-07-09 03:45:41
@article{059c5d4d-021e-4538-8dfb-4f73e9bc15a3,
  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". (C) 2008 Elsevier Ltd. All rights reserved.},
  author       = {Bengtsson, Anders and Bogsjö, Klas and Rychlik, Igor},
  issn         = {1873-4170},
  keyword      = {Coefficient of variation,Rainflow damage,Damage variability},
  language     = {eng},
  number       = {2},
  pages        = {261--274},
  publisher    = {Elsevier},
  series       = {Marine Structures},
  title        = {Uncertainty of estimated rainflow damage for random loads},
  url          = {http://dx.doi.org/10.1016/j.marstruc.2008.05.001},
  volume       = {22},
  year         = {2009},
}