Search Results - "Hajj, M. R."

Modeling and identification of freeplay nonlinearity by Abdelkefi, A., Vasconcellos, R., Marques, F.D., Hajj, M.R.

“…A nonlinear analysis is performed for the purpose of identification of the pitch freeplay nonlinearity and its effect on the type of bifurcation of a two…”
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Representation and analysis of control surface freeplay nonlinearity by Vasconcellos, R., Abdelkefi, A., Marques, F.D., Hajj, M.R.

“…Different representations for a control surface freeplay nonlinearity in a three degree of freedom aeroelastic system are assessed. These are the…”
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Linear and nonlinear active feedback controls for vortex-induced vibrations of circular cylinders by Mehmood, A, Abdelkefi, A, Akhtar, I, Nayfeh, AH, Nuhait, A, Hajj, MR

“…We consider the problem of suppressing oscillations of an elastically mounted rigid cylinder undergoing vortex-induced vibrations by linear and nonlinear…”
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Uncertainty analysis near bifurcation of an aeroelastic system by Ghommem, M., Hajj, M.R., Nayfeh, A.H.

“…Variations in structural and aerodynamic nonlinearities on the dynamic behavior of an aeroelastic system are investigated. The aeroelastic system consists of a…”
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Aeroelastic analysis and nonlinear dynamics of an elastically mounted wing by Ghommem, M., Abdelkefi, A., Nuhait, A.O., Hajj, M.R.

“…The response of an elastically mounted wing that is free to plunge and pitch, supported by nonlinear translational and torsional springs, and interacting with…”
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Nonlinear aeroelastic characterization of wind turbine blades by Bichiou, Y, Abdelkefi, A, Hajj, MR

“…A nonlinear aeroelastic characterization of wind turbine blades is performed. A two-dimensional aerodynamic model based on the quasi-steady approximation is…”
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Unsteady aeroelastic behaviors of rigid airfoils with preset angles of attack by Bichiou, Y, Nuhait, AO, Abdelkefi, A, Hajj, MR

“…The effects of varying the angle of attack on the flutter speed and limit cycle oscillations of an aeroelastic system are investigated. This system consists of…”
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Modeling and analysis of piezoaeroelastic energy harvesters by Abdelkefi, A., Nayfeh, A. H., Hajj, M. R.

“…This work investigates the influence of structural and aerodynamic nonlinearities on the dynamic behavior of a piezoaeroelastic system. The system is composed…”
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Analysis of hurricane wind loads on low-rise structures by Ben Ayed, S., Aponte-Bermudez, L.D., Hajj, M.R., Tieleman, H.W., Gurley, K.R., Reinhold, T.A.

“…Time series of pressure coefficients collected on the roof of a house by the Florida Coastal Monitoring Program during landfall of Hurricane Ivan on the…”
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Global nonlinear distributed-parameter model of parametrically excited piezoelectric energy harvesters by Abdelkefi, A., Nayfeh, A. H., Hajj, M. R.

“…A global nonlinear distributed-parameter model for a piezoelectric energy harvester under parametric excitation is developed. The harvester consists of a…”
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Piezoelectric energy harvesting from vortex-induced vibrations of circular cylinder by Mehmood, A., Abdelkefi, A., Hajj, M.R., Nayfeh, A.H., Akhtar, I., Nuhait, A.O.

“…The concept of harvesting energy from a circular cylinder undergoing vortex-induced vibrations is investigated. The energy is harvested by attaching a…”
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Phenomena and modeling of piezoelectric energy harvesting from freely oscillating cylinders by Abdelkefi, A., Hajj, M. R., Nayfeh, A. H.

“…We investigate energy harvesting from vortex-induced vibrations of a freely moving rigid circular cylinder with a piezoelectric transducer attached to its…”
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Design of piezoaeroelastic energy harvesters by Abdelkefi, A., Nayfeh, A. H., Hajj, M. R.

“…We design a piezoaeroelastic energy harvester consisting of a rigid airfoil that is constrained to pitch and plunge and supported by linear and nonlinear…”
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Enhancement of power harvesting from piezoaeroelastic systems by Abdelkefi, A., Nayfeh, A. H., Hajj, M. R.

“…We investigate the effects of varying the eccentricity between the gravity axis and the elastic axis on the level of energy harvested from a piezoaeroelastic…”
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Effects of nonlinear piezoelectric coupling on energy harvesters under direct excitation by Abdelkefi, A., Nayfeh, A. H., Hajj, M. R.

“…A nonlinear analysis of an energy harvester consisting of a multilayered cantilever beam with a tip mass is performed. The model takes into account geometric,…”
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A stochastic approach for modeling incident gust effects on flow quantities by Pettit, C.L., Hajj, M.R., Beran, P.S.

“…The uncertainty in gust loads on a rigid, flat-plate airfoil at zero angle-of-attack due to imprecise knowledge of the gust parameters is quantified. The loads…”
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Discretization effects on flutter aspects and control of wing/store configurations by Nayfeh, AH, Hammad, BK, Hajj, MR

“…Two discretization approaches are considered for the prediction of the flutter characteristics of the Goland+ wing with a store. In one approach, referred to…”
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Large-eddy simulation of flow over a surface-mounted prism using a high-order finite-difference scheme by El-Okda, Y.M., Ragab, S.A., Hajj, M.R.

“…Large eddy simulation (LES) of the flow field over a surface-mounted prism under two different conditions, namely smooth and turbulent inflows, are carried…”
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Grazing bifurcation in aeroelastic systems with freeplay nonlinearity by Vasconcellos, R., Abdelkefi, A., Hajj, M.R., Marques, F.D.

“…•We investigate the effects of a nonsmooth function on the response of an aeroelastic system.•This system consists of a plunging and pitching rigid…”
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Nonlinear analysis and enhancement of wing-based piezoaeroelastic energy harvesters by Abdelkefi, A., Ghommem, M., Nuhait, A.O., Hajj, M.R.

“…We investigate the level of harvested power from aeroelastic vibrations for an elastically mounted wing supported by nonlinear springs. The energy is harvested…”
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