scholarly journals Frequency-domain source identification and manipulation in stereo mixes for enhancement, suppression and re-panning applications

2004 ◽  
Author(s):  
C. Avendano
Keyword(s):  
Frequency Domain ◽  
Source Identification ◽  
Domain Source

Transient Free-Surface Hydrodynamics Using Rational Approximation of the Green’s Function

1999 ◽  
Vol 43 (02) ◽  
pp. 95-106 ◽  
Author(s):  
Christopher J. Damaren
Keyword(s):  
Free Surface ◽  
Frequency Domain ◽  
Source Function ◽  
The Body ◽  
Floating Body ◽  
Order Ordinary Differential Equation ◽  
Radiation Impedance ◽  
Rational Dependence ◽  
The Time Domain ◽  
Domain Source

Rational approximations in the frequency domain are developed for the source function of linear free-surface hydrodynamics using the recently uncovered fourth-order ordinary differential equation (ODE) satisfied by the time-domain source function. The radiation problem for a floating body in deep water is formulated using a source plus wave-free potential expansion for the fluid. The inherent rational dependence on frequency of the wave-free potentials as well as the source approximation are used to develop a system of constant-coefficient ODE's for the radiation impedance which can be used to develop the motion of the body in a simple manner. The technique is applied to the heaving motion of a floating sphere with good results. The application to more general body geometries is explored by formulating the frequency-domain problem using the variational principle of Chen and Mei and exploiting its polynomial dependence on frequency.

Frequency domain source localization shows state-dependent diazepam effects in 47-channel EEG

1995 ◽  
Vol 99 (1-3) ◽  
pp. 157-171 ◽  
Author(s):  
C. M. Michel ◽  
R. D. Pascual-Marqui ◽  
W. K. Strik ◽  
T. Koenig ◽  
D. Lehmann
Keyword(s):  
Frequency Domain ◽  
Source Localization ◽  
State Dependent ◽  
Domain Source

Prediction of random dynamic loads using second-order blind source identification algorithm

2020 ◽  
Vol 234 (9) ◽  
pp. 1720-1732
Author(s):  
You Jia ◽  
Zhichun Yang ◽  
Erqiang Liu ◽  
Yanhong Fan ◽  
Xuexia Yang
Keyword(s):  
Frequency Response ◽  
Frequency Domain ◽  
Source Identification ◽  
Second Order ◽  
Dynamic Loads ◽  
Modal Parameters ◽  
Frequency Domain Method ◽  
Identification Algorithm ◽  
Structural Dynamic ◽  
Comparison Results

Traditional load identification methods are based on the frequency response function matrix. However, in some cases, it is impossible to measure the frequency response functions directly, where only the measured structural dynamic response data are available. In this paper, a novel frequency domain method based on second-order blind source identification (SOBI) algorithm is proposed for identifying the random dynamic loads from some dynamic responses of limited test points. Firstly, the SOBI algorithm is applied to identify the modal parameters from the time histories of the measured displacement responses and then the modal loads are estimated by the identified modal parameters and modal responses in the modal space; finally, the random dynamic loads can be identified in the frequency domain. In order to control the error propagation, the theoretical formulas of the regularization process have been deduced, and the regularization parameters are selected by the generalized cross-validation method. A numerical simulation and an eight-storey spatial frame experimental model are studied to validate the proposed method; the comparison results show a good agreement between the identified random dynamic loads and the actually exerted loads.

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