Auteur Ahsan Kareem
Documents disponibles écrits par cet auteur (12)
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Haan, F. L. Jr., Auteur ; Ahsan Kareem, Auteur |Turbulence-induced changes in aerodynamic force characteristics on an oscillating rectangular prism were investigated in this study. It encompassed examination of aeroelastic quantities, i.e., flutter derivatives, and the buffeting components of[...]
Article : texte imprimé
Swaroop K. Yalla, Auteur ; Ahsan Kareem, Auteur |The development of a multiple-actuator dynamic load simulator (DLS), for the simulation of correlated dynamic loads on small-scale structural components and substructures, or on bench-scale system assemblage is presented in this paper. Conceptua[...]
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Chen, Xinzhong, Auteur ; Ahsan Kareem, Auteur ; Nicos Makris, Éditeur scientifique |Contemporary high-rise buildings with complex geometric profiles and three-dimensional (3D) coupled mode shapes often complicate the use of high frequency force balance (HFFB) technique customarily used in wind tunnel testing for uncoupled build[...]
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T. Kijewski-Correa, Auteur ; Ahsan Kareem, Auteur ; Nicos Makris, Éditeur scientifique |Two independently emerging time-frequency transformations in Civil Engineering, namely, the wavelet transform and empirical mode decomposition with Hilbert transform (EMD+HT), are discussed in this study. Their application to a variety of nonsta[...]
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Mei, Gang, Auteur ; Spencer Jr., B. F., Éditeur scientifique ; Ahsan Kareem, Auteur ; Kantor, Jeffrey C. |In this paper, a “third generation” benchmark problem that focuses on the control of wind excited response of a tall building, using the Model Predictive Control (MPC) scheme, is presented. A 76 story, 306 m tall concrete office tower proposed f[...]
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Carassale, Luigi, Auteur ; Ahsan Kareem, Auteur |The Volterra-series expansion is widely employed to represent the input-output relationship of nonlinear dynamical systems. This representation is based on the Volterra frequency-response functions (VFRFs), which can either be estimated from obs[...]
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T. Kijewski-Correa, Auteur ; Betti, Raimondo, Éditeur scientifique ; Ahsan Kareem, Auteur |Recently, there has been growing utilization of time-frequency transformations for the analysis and interpretation of nonlinear and nonstationary signals in a broad spectrum of science and engineering applications. The continuous wavelet transfo[...]
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Dae Kun Kwon, Auteur ; Ahsan Kareem, Auteur |The estimation of the extreme of non-Gaussian load effects for design applications has often been treated tacitly by invoking a conventional peak factor on the basis of Gaussian processes. This assumption breaks down when the loading process exh[...]
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T. Kijewski-Correa, Auteur ; Ahsan Kareem, Auteur |Time-frequency transformations have gained increasing attention for the characterization of nonstationary signals in a broad spectrum of science and engineering applications. This study evaluates the performance of two popular transformations, t[...]
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Chen, Xinzhong, Auteur ; Ahsan Kareem, Auteur |Multicorrelated stationary random processes/field can be decomposed into a set of subprocesses by diagonalizing their covariance or cross power spectral density (XPSD) matrices through the eigenvector/modal decomposition. This Proper orthogonal [...]
Article : texte imprimé
Chen, Xinzhong, Auteur ; Nicos Makris, Éditeur scientifique ; Ahsan Kareem, Auteur |Better understanding of the bimodal coupled bridge flutter involving fundamental vertical bending and torsional modes offers valuable insight into multimode coupled flutter, which has primarily been the major concern in the design of long span b[...]
Article : texte imprimé
Megan McCullough, Auteur ; Ahsan Kareem, Auteur |Traditional methods of using surrogate data to test for linearity of time-series data can be extended into the time-frequency domain to test for stationarity. Surrogates are time series that are created directly from the original dataset through[...]
