Kurum Yazarı "Akçay, Hüseyin" Elektrik ve Elektronik Mühendisliği Bölümü İçin Listeleme
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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 ... -
Modelling of road roughness for full-car models: a spectral factorization approach
Türkay, Semiha; Akçay, Hüseyin (IEEE, 2016)In this paper, we study modelling of road roughness for full-car models from power spectrum and coherence measurements of parallel tracks. The modelling problem is cast as a spectral factorization problem and solved via ... -
Multi-objective control design for a truck cabin
Türkay, Semiha; Akçay, Hüseyin (IFAC Secretariat, 2014)In this paper, a multi-objective control of a three-degrees-of-freedom cabin model for a commercial truck excited by random road disturbances is studied. The multi-objective control problem is formulated as a non-convex ... -
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 ... -
Multi-objective control of full-vehicle suspensions: A case study
Türkay, Semiha; Akçay, Hüseyin (IFAC Secretariat, 2011)This paper presents two procedures for multi-objective control of a full-vehicle suspension excited by random road disturbances. The control problem is first formulated as a mixed H2/H? synthesis problem and an output ... -
Multi-Objective Design for Half-Car Active Suspensions
Türkay, Semiha; Akçay, Hüseyin (IEEE, 2012)In this paper, multi-objective control of a half-car suspension system is formulated as a mixed H-2/H-infinity synthesis problem and this convex problem is solved using linear matrix inequalities. Then, the control design ... -
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 ... -
On the existence of a disk algebra basis
Akçay, Hüseyin (Elsevier Science BV, 2000)In this paper, approximation of discrete-time systems by fixed pole orthonormal basis functions is investigated. It is shown that if accumulation points of basis poles do not cover the entire unit circle, then the Fourier ... -
On the performance limitations of quarter-car active suspension models
Türkay, Semiha; Akçay, Hüseyin (2007)In this paper, constraints on the road disturbance transfer functions are derived for a quarter-car active suspension system. The derived constraints complement the existing constraints in the literature. By using the ... -
On the uniform approximation of discrete-time systems by generalized Fourier series
Akçay, Hüseyin (IEEE-Inst Electrical Electronics Engineers Inc, 2001)In this paper, model sets for linear time-invariant discrete-time systems spanned by fixed orthonormal bases are studied. It is shown that the Fourier series of the system transfer function with respect to these bases ... -
Paley inequalities for discrete-time rational orthonormal bases
Akçay, Hüseyin (Elsevier Science BV, 2000)In this paper, we derive some inequalities which provide information about the Fourier coefficients of linear-time-invariant discrete-time systems with respect to the bounded rational orthonormal basis functions studied ... -
Parallel Track Models from Road Measurements
Akçay, Hüseyin; Türkay, Semiha (IEEE, 2017)In this paper, coherence function estimation for parallel tracks from road measurements is studied. A two-stage scheme is proposed. In the first stage, the measurements are de-trended and periodic components are removed. ... -
Positive realness in stochastic subspace identification: A regularized and reweighted nuclear norm minimization approach
Akçay, Hüseyin; Türkay, Semiha (Institute of Electrical and Electronics Engineers Inc., 2015)In this paper, we propose a method to transform a non-positive real transfer function matrix into a positive real one. This problem is of engineering interest and arises when a linear time-invarant dynamics is identified ... -
Positive Realness in Stochastic Subspace Identification: A Regularized and Reweighted Nuclear Norm Minimization Approach
Akçay, Hüseyin; Türkay, Semiha (IEEE, 2015)In this paper, we propose a method to transform a non-positive real transfer function matrix into a positive real one. This problem is of engineering interest and arises when a linear time-invarant dynamics is identified ... -
Power spectrum estimation in innovation models
Akçay, Hüseyin; Türkay, Semiha (Academic Press LTD- Elsevier Science LTD, 2019)In this paper, a regularized nuclear norm minimization-based subspace identification algorithm is proposed to estimate discrete-time power spectra of multi-input/multi-out systems in innovation models from output-only ... -
Power Spectrum Estimation in Innovation Models by Nuclear Norm Optimization
Akçay, Hüseyin; Türkay, Semiha (IEEE Computer Society, 2018)In this paper, identification of discrete-time power spectra of multi-input/multi-output models in innovation form from output-only time-domain measurements is studied. Two regularized nuclear norm minimization-based ... -
Power spectrum estimation with missing values
Akçay, Hüseyin; Türkay, Semiha (IEEE, 2015)In this paper, we consider estimation of a power spectrum from noise corrupted spectrum samples on uniform grids of frequencies with missing values. A scheme based on regularized nuclear norm optimization and subspace ... -
Rail Track Modelling by Using Identification and Curve Fitting Techniques
Türkay, Semiha; Leblebici, Aslı Soyic; Akçay, Hüseyin (IEEE, 2018)In this paper, a seventeen-degree-of-freedom full-car model of a high speed railway vehicle excited by real track profile is going to be studied. The field measurements are collected by Turkish State Railways (TCDD) on a ... -
Rational interpolation from phase data by subspace methods
Akçay, Hüseyin (IEEE, 2010)In this paper, two simple subspace-based identification algorithms to identify stable linear-time-invariant systems from corrupted phase samples of frequency response function are developed. The first algorithm uses data ... -
Rational interpolation of analytic functions from real or imaginary parts of frequency-response data: A subspace-based approach
Akçay, Hüseyin; Türkay, Semiha (2009)In this letter, construction of analytic functions from evaluations of real or imaginary parts on finite subsets of the unit circle is studied. The points in the subsets are not necessarily uniformly spaced as in the most ...