Kurum Yazarı "Akçay, Hüseyin" Bildiri Koleksiyonu İçin Listeleme
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Instrumental variable frequency-domain subspace identification
Akçay, Hüseyin (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, ... -
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 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 ... -
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 ... -
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 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 ... -
Regularized Nuclear Norm Spectrum Estimation in Frequency Domain
Akçay, Hüseyin; Türkay, Semiha (IEEE, 2013)Subspace-based methods have been effectively used to estimate multi-input/multi-output, discrete-time, linear-time invariant systems from spectrum samples. A critical step in these methods is the splitting of causal and ... -
RMS Performance Limitations and Constraints for Quarter-Car Active Suspensions
Akçay, Hüseyin; Türkay, Semiha (IEEE, 2008)In this paper, performance limitations and constraints for an actively controlled quarter-car model subject to white or colored-noise velocity road inputs are investigated. It is demonstrated that tire damping by coupling ... -
Road profile modeling by subspace identification methods
Türkay, Semiha; Akçay, Hüseyin (Institute of Electrical and Electronics Engineers Inc., 2015)In this paper, spectral models of road profiles using nonparametric and subspace identification methods are developed from road elevation measurements. First, power spectra of road profiles are estimated on uniform grids ... -
Road Profile Modeling by Subspace Identification Methods
Türkay, Semiha; Akçay, Hüseyin (IEEE, 2015)In this paper, spectral models of road profiles using nonparametric and subspace identification methods are developed from road elevation measurements. First, power spectra of road profiles are estimated on uniform grids ... -
Road Roughness Modelling by Using Spectral Factorization Methods
Türkay, Semiha; Akçay, Hüseyin (IEEE, 2016)In this paper, road roughness model for the right and the left tracks are constructed by utilizing two methods. In the first method, from time-domain measurements the empirical auto and cross-power spectral densities of ... -
Short-Term Wind Speed Forecasting by Spectral Analysis
Akçay, Hüseyin; Filik, Tansu (IEEE, 2018)In this paper, we apply a wind speed forecasting framework developed earlier by the authors to the two-dimensional wind velocity measurements collected from a meteorological station in the Marmara region of Turkey over a ... -
The size of the membership-set in a probabilistic framework
Akçay, Hüseyin (Pergamon-Elsevier Science LTD, 2004)In this paper, we study the size of the membership-set for system identification in a probabilistic framework. Assuming that the regressors are persistently exciting and the measurement noise is a sequence of independent, ...