Simulation of Stochastic Loads for Fatigue Experiments

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Resumé

A simple direct simulation method for stochastic fatigue-load generation is described in this paper. The simulation method is based on the assumption that only the peaks of the load process significantly affect the fatigue life. The method requires the conditional distribution functions of load ranges given the last peak values. Analytical estimates of these distribution functions are presented in the paper and compared with estimates based on a more accurate simulation method. In the more accurate simulation method samples at equidistant times are generated by approximating the stochastic load process by a Markov process. Two different spectra from two tubular joints in an offshore structure (one narrow banded and one wide banded) are considered in an example. The results show that the simple direct method is quite efficient and results in a simulation speed of about 3000 load cycles per second using a personal computer. Finally the proposed simulation method for fatigue-load generation is tested by comparing some fatigue damage measures obtained by the simulation methods.
OriginalsprogEngelsk
TidsskriftExperimental Mechanics
Vol/bind29
Udgave nummer2
Sider (fra-til)174-182
Antal sider9
ISSN0014-4851
StatusUdgivet - 1989

Fingerprint

Fatigue of materials
Distribution functions
Experiments
Offshore structures
Fatigue damage
Personal computers
Markov processes

Emneord

  • Loadings
  • Loads
  • Structural Systems
  • Stochastic Fatigue Load Generation
  • Simulation Methods

Citer dette

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title = "Simulation of Stochastic Loads for Fatigue Experiments",
abstract = "A simple direct simulation method for stochastic fatigue-load generation is described in this paper. The simulation method is based on the assumption that only the peaks of the load process significantly affect the fatigue life. The method requires the conditional distribution functions of load ranges given the last peak values. Analytical estimates of these distribution functions are presented in the paper and compared with estimates based on a more accurate simulation method. In the more accurate simulation method samples at equidistant times are generated by approximating the stochastic load process by a Markov process. Two different spectra from two tubular joints in an offshore structure (one narrow banded and one wide banded) are considered in an example. The results show that the simple direct method is quite efficient and results in a simulation speed of about 3000 load cycles per second using a personal computer. Finally the proposed simulation method for fatigue-load generation is tested by comparing some fatigue damage measures obtained by the simulation methods.",
keywords = "Loadings, Loads, Structural Systems, Stochastic Fatigue Load Generation, Simulation Methods, Loadings, Loads, Structural Systems, Stochastic Fatigue Load Generation, Simulation Methods",
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}

Simulation of Stochastic Loads for Fatigue Experiments. / Sørensen, John Dalsgaard; Brincker, Rune.

I: Experimental Mechanics, Bind 29, Nr. 2, 1989, s. 174-182.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Simulation of Stochastic Loads for Fatigue Experiments

AU - Sørensen, John Dalsgaard

AU - Brincker, Rune

PY - 1989

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N2 - A simple direct simulation method for stochastic fatigue-load generation is described in this paper. The simulation method is based on the assumption that only the peaks of the load process significantly affect the fatigue life. The method requires the conditional distribution functions of load ranges given the last peak values. Analytical estimates of these distribution functions are presented in the paper and compared with estimates based on a more accurate simulation method. In the more accurate simulation method samples at equidistant times are generated by approximating the stochastic load process by a Markov process. Two different spectra from two tubular joints in an offshore structure (one narrow banded and one wide banded) are considered in an example. The results show that the simple direct method is quite efficient and results in a simulation speed of about 3000 load cycles per second using a personal computer. Finally the proposed simulation method for fatigue-load generation is tested by comparing some fatigue damage measures obtained by the simulation methods.

AB - A simple direct simulation method for stochastic fatigue-load generation is described in this paper. The simulation method is based on the assumption that only the peaks of the load process significantly affect the fatigue life. The method requires the conditional distribution functions of load ranges given the last peak values. Analytical estimates of these distribution functions are presented in the paper and compared with estimates based on a more accurate simulation method. In the more accurate simulation method samples at equidistant times are generated by approximating the stochastic load process by a Markov process. Two different spectra from two tubular joints in an offshore structure (one narrow banded and one wide banded) are considered in an example. The results show that the simple direct method is quite efficient and results in a simulation speed of about 3000 load cycles per second using a personal computer. Finally the proposed simulation method for fatigue-load generation is tested by comparing some fatigue damage measures obtained by the simulation methods.

KW - Loadings

KW - Loads

KW - Structural Systems

KW - Stochastic Fatigue Load Generation

KW - Simulation Methods

KW - Loadings

KW - Loads

KW - Structural Systems

KW - Stochastic Fatigue Load Generation

KW - Simulation Methods

M3 - Journal article

VL - 29

SP - 174

EP - 182

JO - Experimental Mechanics

JF - Experimental Mechanics

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