scholarly journals Underdetermined DOA estimation via multiple time-delay covariance matrices and deep residual network

2021 ◽  
Vol 32 (6) ◽  
pp. 1354-1363
Author(s):  
Chen Ying ◽  
Wang Xiang ◽  
Huang Zhitao
Keyword(s):  
Time Delay ◽  
Doa Estimation ◽  
Covariance Matrices ◽  
Multiple Time ◽  
Residual Network

Parametric Resonance of a Self-Excited System Under External Force and Time Delay Influence

2013 ◽  
Author(s):  
Jerzy Warminski ◽  
Anna Warminska
Keyword(s):  
Time Delay ◽  
External Force ◽  
Parametric Resonance ◽  
Parametric Excitation ◽  
Multiple Time ◽  
Frequency Locking ◽  
Scale Method ◽  
Rayleigh Function ◽  
Excited System ◽  
Multiple Time Scale Method

Vibrations of a nonlinear self-excited system driven by parametric excitation are presented in the paper. The considered model with one DOF includes a self-excitation term represented by a nonlinear Rayleigh function and also a periodically varied stiffness coefficient which represents parametric excitation. The influence of the external force or/and time delay, treated as a control signal, is demonstrated. Nonlinear parametric resonance is determined numerically and analytically by the multiple time scale method. The influence of time delay on the resonance zones and the frequency locking phenomenon is analysed.

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