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- 저자 : Asma Karoui (검색결과 2 건)
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A New Convolution Approach for the Time-delay Identification of Systems with Arbitrary Entries
Asma Karoui,Kaouther Ibn Taarit,Moufida Ksouri 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.6
In this paper, an online delay identification approach of continuous-time linear systems with unstructuredentries is achieved via a new algebraic technique. The arbitrary input and output trajectories are chosen with closeand abundant crossing zero. Initial conditions and static disturbances are taken into account in the design of theidentification approach. The proposed method is based on a distributional algebraic technique and a convolution approach. A proposed theorem is hence enounced to identify a single time-delay of such systems. The effectiveness ofthe proposed approach is demonstrated by an illustrative example. The obtained results show the high performancesof the proposed time-delay identification approach in severe operation conditions of the considered system.
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The questionable effectiveness of code accidental eccentricity
Abderrahmane Ouazir,Asma Hadjadj,Hatem Gasmi,Hatem Karoui 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.83 No.1
The need to account for accidental torsion in seismic design is no longer debatable, however, the seismic codes’ requirement for accidental eccentricity has recently faced criticism. In order to get as close to real conditions as possible, this study investigated the impact of accidental torsion in symmetric RC multistory buildings caused by one of its many sources, the torsional earthquake component, and compared the results to those obtained by using the accidental eccentricity recommended by the codes (shifting the center of mass). To cover a wide range of frequencies and site conditions, two types of torsion seismic components were used: a recorded torsion accelerogram and five others generated using translation accelerograms. The main parameters that govern seismic responses, such as the number of stories (to account for the influence of all modes of vibration) and the frequency ratio (Ω) variation, were studied in terms of inter-story drift and displacement responses, as well as torsional moment. The results show that the eccentricity ratio of 5% required by most codes for accidental torsion should be reexamined and that it is prudent for computer analysis to use the static moment approach to implement the accidental eccentricity while waiting for new seismic code recommendations on the subject.
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