Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13471
Title: Nonlinear frequency-domain analysis of fixed structures subjected to morison-type wave forces
Authors: ZHENG XIANGYUAN
Keywords: Cumulant spectral analysis; Fixed offshore structures; Higher-order drag polynomialization; Correlation function; Multi-dimensional Fourier Transforms
Issue Date: 13-Oct-2003
Source: ZHENG XIANGYUAN (2003-10-13). Nonlinear frequency-domain analysis of fixed structures subjected to morison-type wave forces. ScholarBank@NUS Repository.
Abstract: For fixed offshore structures, a cumulant spectral analysis approach that is based on correlation-functions of wave kinematics and Fourier transforms is proposed for evaluating variance, skewness and kurtosis of the nonlinear wave loadings and induced structural responses. The linear wave theory is adopted and the joint-Gaussianity of wave kinematics is assumed. To account for the super-harmonic phenomena and to facilitate frequency-domain analysis, nonlinear drag forces are approximated by higher-order polynomials. The methods of least squares and moment-based approximation are compared. For power spectral and trispetcral analyses of a LTI system driven by the local Morison force or modal wave force, the detailed procedures are presented. The proposed approach is found to be more numerically efficient than the traditional Volterra series based frequency-domain method and time-domain simulations. A good agreement of the numerical results obtained in the frequency and time domains is also observed.
URI: http://scholarbank.nus.edu.sg/handle/10635/13471
Appears in Collections:Ph.D Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
Title_Page.pdf46.12 kBAdobe PDF

OPEN

NoneView/Download
Acknowledgement.pdf70.83 kBAdobe PDF

OPEN

NoneView/Download
Table_of_Contents.pdf99.13 kBAdobe PDF

OPEN

NoneView/Download
Summary.pdf69.86 kBAdobe PDF

OPEN

NoneView/Download
Nomenclature.pdf111.75 kBAdobe PDF

OPEN

NoneView/Download
List_of_Figures.pdf106.73 kBAdobe PDF

OPEN

NoneView/Download
List_of_Tables.pdf93.36 kBAdobe PDF

OPEN

NoneView/Download
Chapter_1.pdf167.66 kBAdobe PDF

OPEN

NoneView/Download
Chapter_2.pdf276.27 kBAdobe PDF

OPEN

NoneView/Download
Chapter_3.pdf326.35 kBAdobe PDF

OPEN

NoneView/Download
Chapter_4.pdf362.65 kBAdobe PDF

OPEN

NoneView/Download
Chapter_5.pdf5.95 MBAdobe PDF

OPEN

NoneView/Download
Chapter_6.pdf11.15 MBAdobe PDF

OPEN

NoneView/Download
Chapter_7.pdf102.49 kBAdobe PDF

OPEN

NoneView/Download
References.pdf107.78 kBAdobe PDF

OPEN

NoneView/Download
Appendix_I.pdf105.89 kBAdobe PDF

OPEN

NoneView/Download
Appendix_II.pdf86.28 kBAdobe PDF

OPEN

NoneView/Download
Appendix_III.pdf110.57 kBAdobe PDF

OPEN

NoneView/Download
Appendix_IV.pdf121.76 kBAdobe PDF

OPEN

NoneView/Download

Page view(s)

415
checked on Dec 11, 2017

Download(s)

4,039
checked on Dec 11, 2017

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.