Time-Variant System Approximation via Later-Time Samples

2021 ◽  
pp. 1-9
Author(s):  
Roza Aceska ◽  
Yeon Hyang Kim
Keyword(s):  
Variant System

Time variant system identification of superstructures of base-isolated buildings

2021 ◽  
Vol 246 ◽  
pp. 112697
Author(s):  
Francisco Hernández ◽  
Pablo Díaz ◽  
Rodrigo Astroza ◽  
Felipe Ochoa-Cornejo ◽  
Xihong Zhang
Keyword(s):  
System Identification ◽  
Variant System

scholarly journals DC/DC Boost Converter Controller

2018 ◽  
Vol 3 (3) ◽  
pp. 53-59 ◽  
Author(s):  
José Ferreira
Keyword(s):  
Linear System ◽  
Output Voltage ◽  
Voltage Regulation ◽  
Boost Converter ◽  
System Stability ◽  
Comparative Approach ◽  
System State ◽  
And Performance ◽  
Time Linear ◽  
Variant System

The DC/DC boost converter is described as a time variant system. State-Space is one of the methods used to approach a time variant system to an invariant time linear system. The present document focuses on a comparative approach of output voltage regulation and system stability and performance. For this document, there were made MatLab tests of PI and PD controllers, with and without fuzzy control.

scholarly journals Wavelet-based analysis of time-variant adaptive structures

2018 ◽  
Vol 376 (2126) ◽  
pp. 20170245 ◽  
Author(s):  
Kajetan Dziedziech ◽  
Alexander Nowak ◽  
Alexander Hasse ◽  
Tadeusz Uhl ◽  
Wiesław J. Staszewski
Keyword(s):  
Frequency Response Function ◽  
Natural Frequencies ◽  
Fibre Composite ◽  
Structural Response ◽  
Structural Stiffness ◽  
Theme Issue ◽  
Adaptive Structures ◽  
Output Characteristics ◽  
Variant System

Wavelet analysis is applied to identify the time-variant dynamics of adaptive structures. The wavelet-based power spectrum of the structural response, wavelet-based frequency response function (FRF) and wavelet-based coherence are used to identify continuously and abruptly varying natural frequencies. A cantilever plate with surface-bonded macro fibre composite—which alters the structural stiffness—is used to demonstrate the application of the methods. The results show that the wavelet-based input–output characteristics—i.e. the FRF and coherence—can identify correctly the dynamics of the analysed time-variant system and reveal the varying natural frequency. The wavelet-based coherence can be used not only for the assessment of the quality of the wavelet-based FRF but also for the identification. This article is part of the theme issue ‘Redundancy rules: the continuous wavelet transform comes of age’.

scholarly journals A variant System I for cytochromecbiogenesis in archaea and some bacteria has a novel CcmE and no CcmH

FEBS Letters ◽  
2006 ◽  
Vol 580 (20) ◽  
pp. 4827-4834 ◽  
Author(s):  
James W.A. Allen ◽  
Edgar M. Harvat ◽  
Julie M. Stevens ◽  
Stuart J. Ferguson
Keyword(s):  
Variant System
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