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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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Bispectrum and Bicorrelation: a higher order stochastic approach to non-Gaussian Dynamic Wind Loading

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Esposito Marzino, Michele ULiège
Promotor(s) : Denoël, Vincent ULiège
Date of defense : 26-Jun-2019/27-Jun-2019 • Permalink : http://hdl.handle.net/2268.2/6745
Details
Title : Bispectrum and Bicorrelation: a higher order stochastic approach to non-Gaussian Dynamic Wind Loading
Author : Esposito Marzino, Michele ULiège
Date of defense  : 26-Jun-2019/27-Jun-2019
Advisor(s) : Denoël, Vincent ULiège
Committee's member(s) : De Miranda, Stefano 
De Ville De Goyet, Vincent ULiège
Andrianne, Thomas ULiège
Language : English
Keywords : [en] Wind Engineering
[en] Dynamics of Structures
[en] Bispectrum
[en] Response Spectra
[en] Stochastic Analysis
[en] Non-Gaussian
[en] Random Processes
[en] Fourier Analysis
Discipline(s) : Engineering, computing & technology > Civil engineering
Target public : Researchers
Professionals of domain
Student
General public
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil des constructions, à finalité spécialisée en "civil engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] The main objective of this Thesis is to provide a more efficient as precise alternative to classic dynamic analysis. Conventionally, it is performed by means of Fourier Analysis, in which time series of the loading are analysed, then brought into the frequency domain (by Fourier Transform), applied to the specific structure (characterised by its Transfer Function, which depend on structural parameters only) to get response in the frequency domain, then Inverse Fourier Transform is applied to recover response in time domain.
As it can be clearly understood, this process becomes very heavy when dealing with (real) structures having many degrees of freedom - because this double transformation has to be done for each degree of freedom to be able to reconstruct the entire structural response (supposing to perform analysis in the Modal Base, which is almost always the case since with nowadays F.E.M. software, recovering the Modal Matrix is no more time consuming as it could have been some years ago).
Therefore, specially for the pre-design stages of a civil engineering project, an alternative method, faster as well as reliable, able to compute or characterise structural response is needed. In this framework, this Thesis takes its place.
It will be shown and proved, as in other previous works, an alternative dynamic analysis method based on the Background and Resonant responses, under the assumption of stationary Gaussian loading. It is basically based on the decomposition of the response in its two major components, which are by their own computed based on
main statistical quantities of the loading (mean value and Power Spectral Density Function or, equally, variance). This way, the previous Double time-frequency transformation is avoided: once loading is known (i.e. measured or simulated), response can be reconstructed by statistical analysis.
However, this decomposition is no more valid when the loading has non-Gaussian distribution. Therefore, the aim of this Thesis is to finally validate an extension of the previous approach to more general cases in which loading is non-Gaussian. Still, the response will be decomposed in its Background and Bi-resonant components in the frequency space, where they will be connected to higher order statistical quantities of the loading.


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Author

  • Esposito Marzino, Michele ULiège Université de Liège > Master ingé. civ. constr., fin.

Promotor(s)

Committee's member(s)

  • De Miranda, Stefano University of Bologna > Civil Engineering > Science of Construction
  • De Ville De Goyet, Vincent ULiège Université de Liège - ULiège > Département ArGEnCo > Conception, calcul et exécution des structures except.
    ORBi View his publications on ORBi
  • Andrianne, Thomas ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
    ORBi View his publications on ORBi
  • Total number of views 10
  • Total number of downloads 6










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