Yazar "Akçay, Hüseyin" için Makale Koleksiyonu listeleme
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An analysis of transformer excitation current under nonsinusoidal supply voltage
Ece, Doğan Gökhan; Akçay, Hüseyin (IEEE-Inst Electrical Electronics Engineers Inc, 2002)In this paper, the effect of nonsinusoidal supply voltage on the core loss and the transformer excitation current is investigated. The time-domain waveform of the transformer excitation current is calculated for a worst-case ... -
Aspects of achievable performance for quarter-car active suspensions
Türkay, Semilla; Akçay, Hüseyin (Academic Press LTD- Elsevier Science LTD, 2008)In this paper, constraints on the transfer functions from the road disturbance to the vertical acceleration, the suspension travel, and the tire deflection are derived for a quarter-car active suspension system using the ... -
Continuous-time stable and unstable system modelling with orthonormal basis functions
Akçay, Hüseyin (John Wiley & Sons LTD, 2000)In this paper, model sets for linear time-invariant continuous-time systems which are spanned by fixed-pole orthonormal bases are investigated. The obtained model sets are shown to be complete in the Lebesque spaces L-p ... -
Convergence analysis of central and minimax algorithms in scalar regressor models
Akçay, Hüseyin; At, Nuray (Springer London LTD, 2006)In this paper, the estimation of a scalar parameter is considered with given lower and upper bounds of the scalar regressor. We derive non-asymptotic, lower and upper bounds on the convergence rates of the parameter estimate ... -
Discussion on: "Generalized linear dynamic factor models: An approach via singular autoregressions"
Akçay, Hüseyin (Lavoisier, 2010)[No abstract available] -
Frequency domain analysis of model order reduction techniques
Cünedioğlu, Y; Mugan, A; Akçay, Hüseyin (Elsevier Science BV, 2006)In this Study, some popular model order reduction and superelement techniques are studied in frequency and time domains. Frequency domain identification (FDI) methods are also applied to semidiscrete finite element equations ... -
Frequency domain subispace-based identification of discrete-time power spectra from nonuniformly spaced measurements
Akçay, Hüseyin; Türkay, Semiha (Pergamon-Elsevier Science LTD, 2004)In this paper, we present a new subspace-based algorithm for the identification of multi-input/multi-output, square, discrete-time, linear-time invariant systems from nonuniformly spaced power spectrum measurements. The ... -
Frequency domain subspace-based identification of discrete-time power spectra from uniformly spaced measurements
Akçay, Hüseyin (Pergamon-Elsevier Science LTD, 2011)In this paper, we revisit the problem of identifying multi-input/multi-output linear-time-invariant discrete-time systems from measured power spectrum data on uniform grids of frequencies studied by Van Overschee, De Moor, ... -
Frequency domain subspace-based identification of discrete-time singular power spectra
Akçay, Hüseyin (Elsevier Science BV, 2012)In this paper, we propose a subspace algorithm for the identification of linear-time-invariant discrete-time systems with more outputs than inputs from measured power spectrum data. The proposed identification algorithm ... -
A frequency-domain iterative identification algorithm using general orthonormal basis functions
Akçay, Hüseyin; Heuberger, P (Pergamon-Elsevier Science LTD, 2001)In this paper, a two-step frequency-domain identification algorithm is proposed, in which the identified model is parameterized in terms of general orthonormal basis functions. Furthermore an update scheme is presented, ... -
General orthonormal bases or robust identification in H-infinity
Akçay, Hüseyin (Siam Publications, 2001)In this paper, the problem of system identification in H-infinity with general orthonormal basis functions is investigated. A two-stage algorithm is show to be robust, provided that the umber of basis elements as a function ... -
A generalization of a standard inequality for Hardy space H-1
Akçay, Hüseyin (Pergamon-Elsevier Science LTD, 2001)In this paper, we generalize a standard inequality for the Hardy space H-1 to involve a family of rational basis systems with cyclically repeated poles. This inequality is used to derive an inequality that gives information ... -
Identification of continuous-time power spectra by generalized Fourier series
Akçay, Hüseyin; Türkay, Semiha (Chinese Automatic Control Soc, 2007)In this paper, we present a generalized Fourier series based algorithm for the identification of continuous-time, linear-time invariant systems from power spectrum measurements. The algorithm is strongly consistent and it ... -
Influence of Tire Damping on Actively Controlled Quarter-Car Suspensions
Akçay, Hüseyin; Türkay, Semiha (Asme, 2011)In this note, a comprehensive analysis of tire damping effect on H-2-optimal, multi-objective, and robust control of quarter-car suspensions excited by random road disturbances is provided. First, H-2-optimal and convex ... -
Influence of tire damping on mixed H-2/H-infinity synthesis of half car active suspensions
Akçay, Hüseyin; Türkay, Semiha (Academic Press LTD- Elsevier Science LTD, 2009)In this paper, multi-objective control of a half-car suspension system using linear matrix inequalities is studied. It is observed that when tire damping is precisely known, road-holding quality of the suspension system ... -
An insight into instrumental variable frequency-domain subspace identification
Akçay, Hüseyin (Pergamon-Elsevier Science LTD, 2010)In this paper, we study instrumental variable subspace identification of multi-input/multi-output linear-time-invariant, discrete-time systems from non-uniformly spaced frequency response measurements. A particular algorithm, ... -
Membership set identification with periodic inputs and orthonormal regressors
Akçay, Hüseyin; At, Nuray (Elsevier Science BV, 2006)In this paper, we study the central and the projection algorithms in membership-set estimation with periodic input signals and orthonormal basis functions for the special case that the number of the estimated parameters ... -
Modeling of hysteresis and power losses in transformer laminations
Akçay, Hüseyin; Ece, Dugan Gökhan (IEEE-Inst Electrical Electronics Engineers Inc, 2003)In this paper, a method for the representation of hysteresis and power losses in the laminations of power transformers is proposed. The developed model is based on data supplied from steel manufacturer and able to predict ... -
Multi-objective control of a full-car model using linear-matrix-inequalities and fixed-order optimisation
Türkay, Semiha; Akçay, Hüseyin (Taylor & Francis LTD, 2014)This paper studies multi-objective control of a full-vehicle suspension excited by random road disturbances. The control problem is first formulated as a mixed H-2/H synthesis problem and an output-feedback solution is ... -
Nuclear Norm Spectrum Estimation From Uniformly Spaced Measurements
Akçay, Hüseyin (IEEE-Inst Electrical Electronics Engineers Inc, 2014)Subspace-based methods have been effectively used to estimate multi-input/multi-output, discrete-time, linear-time invariant systems from uniformly spaced spectrum samples. A critical step in these methods is the splitting ...