Error assessment for spectral representation method in random field simulation / Yufeng Gao in Journal of engineering mechanics, Vol. 138 N° 6 (Juin 2012)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 138 N° 6 (Juin 2012) . - pp.711-715 Titre : Error assessment for spectral representation method in random field simulation Type de document : texte imprimé Auteurs : Yufeng Gao, Auteur ; Yongxin Wu, Auteur ; Yuanqiang Cai, Auteur Année de publication : 2012 Article en page(s) : pp.711-715 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Random field simulation Spectral representation method Error assessment Résumé : Random fields, such as the wind velocity field and the seismic ground motion field, are usually simulated by the spectral representation method (SRM). The SRM mainly relies on two methods: the random amplitudes method and the random phases method. However, the temporal statistics estimated from one SRM-simulated sample process differs from the target characteristics. Such differences can usually be assessed by the statistical errors, i. e., bias errors and stochastic errors. The closed-form solutions of statistical errors produced by random phases method have been given. This paper gives the closed-form solutions of statistical errors produced by the random phases methods and compares the statistical errors produced by both methods. The comparison of the stochastic errors of power spectral density functions produced by different methods demonstrates that (1) the random amplitudes method exhibits higher but more uniformly distributed stochastic errors than the random phases method; and (2) the stochastic errors produced by the random phases method are dependent on the decomposition method, whereas those produced by the random amplitudes method are not. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000379 [article] Error assessment for spectral representation method in random field simulation [texte imprimé] / Yufeng Gao, Auteur ; Yongxin Wu, Auteur ; Yuanqiang Cai, Auteur . - 2012 . - pp.711-715. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 6 (Juin 2012) . - pp.711-715 Mots-clés : Random field simulation Spectral representation method Error assessment Résumé : Random fields, such as the wind velocity field and the seismic ground motion field, are usually simulated by the spectral representation method (SRM). The SRM mainly relies on two methods: the random amplitudes method and the random phases method. However, the temporal statistics estimated from one SRM-simulated sample process differs from the target characteristics. Such differences can usually be assessed by the statistical errors, i. e., bias errors and stochastic errors. The closed-form solutions of statistical errors produced by random phases method have been given. This paper gives the closed-form solutions of statistical errors produced by the random phases methods and compares the statistical errors produced by both methods. The comparison of the stochastic errors of power spectral density functions produced by different methods demonstrates that (1) the random amplitudes method exhibits higher but more uniformly distributed stochastic errors than the random phases method; and (2) the stochastic errors produced by the random phases method are dependent on the decomposition method, whereas those produced by the random amplitudes method are not. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000379

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