Spectral Density Functions and Their Applications

2021 ◽  
Author(s):  
Chung Yuen Wong
Keyword(s):  
Spectral Density ◽  
Density Functions ◽  
Spectral Density Functions

A New Spectral Method for Modeling Dynamic Ice Actions

2004 ◽  
Author(s):  
Tuomo Ka¨rna¨ ◽  
Yan Qu ◽  
Walter L. Ku¨hnlein
Keyword(s):  
Dynamic Response ◽  
Spectral Density ◽  
Time Correlation ◽  
General Purpose ◽  
Density Functions ◽  
Offshore Structure ◽  
Spectral Density Functions ◽  
Ice Force ◽  
Ice Forces ◽  
Scale Data

This paper presents a method of evaluating the response of a vertical offshore structure that is subjected to dynamic ice actions. The model concerns a loading scenario where a uniform ice sheet is drifting and crushing against the structure. Full scale data obtained at the lighthouse Norstro¨msgrund is used in the derivation of a method that applies both to narrow and wide structures. A large amount of events with directly measured local forces was used to derive formulas for spectral density functions of the ice force. A non-dimensional formula that was derived for the autospectrum applies for all ice thicknesses. Coherence functions are used to define the cross-spectra of the local ice forces. The two kind of spectral density functions for local forces can be used to evaluate the spectral density of the total ice force. The method takes account of both the spatial and time correlation between the local forces. Accordingly, the model provides a tool to consider the non-simultaneous characteristics of the local ice pressures while assessing the total ice force. The model can be used in conjunction with general purpose FE programs to evaluate the dynamic response of an offshore structure.

Specular cross-spectral density functions

1988 ◽  
Vol 68 (4) ◽  
pp. 239-243 ◽  
Author(s):  
F. Gori ◽  
G. Guattari ◽  
C. Palma ◽  
C. Padovani
Keyword(s):  
Spectral Density ◽  
Density Functions ◽  
Cross Spectral Density ◽  
Spectral Density Functions

scholarly journals A search for X-ray reprocessing echoes in the power spectral density functions of AGN

2016 ◽  
Vol 461 (2) ◽  
pp. 1642-1655 ◽  
Author(s):  
D. Emmanoulopoulos ◽  
I. E. Papadakis ◽  
A. Epitropakis ◽  
T. Pecháček ◽  
M. Dovčiak ◽  
...  
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Density Functions ◽  
X Ray ◽  
Power Spectral ◽  
Spectral Density Functions
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