21 results on '"Akçay, Hüseyin"'
Search Results
2. Short-term wind speed forecasting by spectral analysis from long-term observations with missing values
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Tansu Filik, Hüseyin Akçay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Akçay, Hüseyin, and Filik, Tansu
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Wind Speed Forecasting ,Meteorology ,Computer science ,020209 energy ,02 engineering and technology ,Management, Monitoring, Policy and Law ,Wind speed ,020401 chemical engineering ,Missing Data ,Benchmark (surveying) ,0202 electrical engineering, electronic engineering, information engineering ,Wind Energy ,0204 chemical engineering ,Wind power ,business.industry ,Mechanical Engineering ,Spectrum Estimation ,Building and Construction ,Kalman filter ,Missing data ,Term (time) ,General Energy ,Time-Series ,Trimming ,Auto-Regressive Moving Average ,business ,Kalman Filter ,Subspace topology - Abstract
WOS: 000395963500050, In this paper, we propose a novel wind speed forecasting framework. The performance of the proposed framework is assessed on the wind speed measurements collected from the five meteorological stations in the Marmara region of Turkey. The experimental results show that trimming of the diurnal, the weekly, the monthly, and the annual patterns in the measurements significantly enhances the estimation accuracy. The proposed framework builds on data de-trending, covariance-factorization via a recently developed subspace method, and one-step-ahead and/or multi-step-ahead Kalman filter prediction ideas. The data sets do not have to be complete. In fact, as in sensor failures, intermittently or sequentially missing measurements are permitted. The numerical experiments on the real data sets show that the wind speed forecasts, in particular the multi-step-ahead forecasts, outperform the benchmark values computed with the persistence forecasting models by a clear difference, Anadolu University [1602F070], The work of the first author was supported by the Anadolu University Scientific Research Projects Fund under Grant 1602F070.
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- 2017
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3. Parallel track models from road measurements
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Hüseyin Akçay, Semiha Turkay, Popescu, D, Sendrescu, D, Roman, M, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Akçay, Hüseyin, and Türkay, Semiha
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0209 industrial biotechnology ,Engineering ,Parallel Tracks ,Stochastic process ,business.industry ,Spectral density estimation ,Spectral density ,020302 automobile design & engineering ,02 engineering and technology ,Road roughness ,Road Roughness ,Power Spectral Density ,020901 industrial engineering & automation ,0203 mechanical engineering ,Autoregressive model ,Coherence (signal processing) ,Model development ,Autoregressive–moving-average model ,business ,Coherence ,Algorithm ,Simulation - Abstract
18th International Carpathian Control Conference (ICCC) -- MAY 28-31, 2017 -- Sinaia, ROMANIA, WOS: 000426954400047, 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. An auto regressive moving-average (ARMA) model is fitted in the second stage to the vector-valued residuals derived from the left and right track measurements by using a recently developed spectral estimation algorithm. The ARMA model yields not only the power spectral density (PSD) estimates of the individual tracks, but also the coherence function estimate of the parallel tracks. The proposed model development procedure is tested on the real data from the Long Term Pavement Performance (LTPP) database., IEEE
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- 2017
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4. Wind Speed Forecasting with Missing Values
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Tansu Filik, Hüseyin Akçay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Akçay, Hüseyin, and Filik, Tansu
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0209 industrial biotechnology ,Meteorology ,Computer science ,02 engineering and technology ,Atmospheric model ,01 natural sciences ,Wind speed ,010104 statistics & probability ,020901 industrial engineering & automation ,Missing Data ,Wind Energy ,0101 mathematics ,Simulation ,Wind power ,Spectral Factorization ,business.industry ,Kalman filter ,Missing data ,Term (time) ,Auto-Regressive Moving-Average Model ,Benchmark (computing) ,Time-Series ,Probabilistic forecasting ,business ,Kalman Filter ,Forecasting - Abstract
7th International Conference on Information Science and Technology (ICIST) -- APR 16-19, 2017 -- Da Nang, VIETNAM, WOS: 000403402600010, In this study, a new short term wind speed forecasting approach, which uses long term past observations, is proposed. The performance assessment of the wind speed forecasting framework is carried out using real data from meteorological stations in Marmara region of Turkey. The data sets are not complete due to equipment failures. The proposed approach builds on data de-trending, covariance-factorization via a subspace method, and one-step-ahead and multi-step-ahead Kalman filter prediction ideas. It is shown that trimming of diurnal, weekly, monthly, and annual patterns in data significantly enhances estimation accuracy. Experimental test results demonstrate that the proposed multi-step-ahead forecasting outperforms the benchmark values computed with the persistent forecasting models., City Univ Hong Kong, Vietnam Korea Friendship Informat Technol Coll, Hong Kong Web Soc, IEEE Syst, Man & Cybernet Soc, Anadolu University Scientific Research Projects Fund [1602F070], The first author was supported by the Anadolu University Scientific Research Projects Fund under Grant 1602F070.
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- 2017
5. Road Roughness Evaluation by Curve-Fitting and Subspace-Identification Methods
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Semiha Turkay, Hüseyin Akçay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkay, Semiha, and Akçay, Hüseyin
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Physics::Physics and Society ,0209 industrial biotechnology ,Engineering ,Transportation ,02 engineering and technology ,Square (algebra) ,System Identification Subspace Method ,symbols.namesake ,Power Spectral Density ,020901 industrial engineering & automation ,Frequency Domain ,0203 mechanical engineering ,Statistics ,International Roughness Index ,Gaussian process ,Statistic ,Civil and Structural Engineering ,business.industry ,Spectral density ,020302 automobile design & engineering ,Covariance ,Motor Industry Research Association ,Road Profile ,Roughness ,Iso 8608 ,symbols ,Curve fitting ,Root Mean Square ,business ,Algorithm ,Subspace topology - Abstract
WOS: 000386363700004, In this paper, for a quarter-car model, root-mean square response variables are calculated for roads classified by the international standard organization, based on the straight-line spectrum models. Covariance expressions are derived for vehicle response variables assuming that the road spectrum is that of a Motor Industry Research Association (MIRA) spectrum and compared with the existing results in the literature. The international standard and the MIRA spectra are then compared with the models delivered by high resolution frequency-domain subspace identification algorithms. The IRI statistic of the quarter-car response is calculated for the road models built by the curve fitting and the identification methods from the measured road spectrum assuming that the road excitation is a zero-mean Gaussian process, Scientific & Technological Research Council of Turkey [112E264], This work was supported by the Scientific & Technological Research Council of Turkey under Grant 112E264.
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- 2016
6. Modelling of road roughness for full-car models: a spectral factorization approach
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Hüseyin Akçay, Semiha Turkay, Petre, E, Brezovan, M, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkay, Semiha, and Akçay, Hüseyin
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0209 industrial biotechnology ,Engineering ,Mathematical optimization ,Spectral Factorization ,business.industry ,Direct method ,Subspace Identification ,Spectral density ,020302 automobile design & engineering ,02 engineering and technology ,Spectral theorem ,Road Roughness ,Axle ,020901 industrial engineering & automation ,0203 mechanical engineering ,Factorization ,Full-Car Model ,Power Spectrum ,Applied mathematics ,Padé approximant ,Coherence (signal processing) ,business ,Estimation ,Subspace topology - Abstract
20th International Conference on System Theory, Control and Computing (ICSTCC) -- OCT 13-15, 2016 -- Sinaia, ROMANIA, WOS: 000391609900096, 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 subspace-based identification algorithms. Two different spectral factorization problems are formulated. In the first formulation, four road inputs are directly identified in innovation form while in the second formulation, an excitation model for the front axle is first identified and then, the excitation model for the rear axle is derived from the front axle model via Pade approximation of a time-delay. The numerical study performed on real data shows that both factorization formulations have similar performances despite the direct approach yields less complex models., Inst Elect & Elect Engineers, Control Syst Soc, Univ Craiova, Fac Automat Comp Elect, Automat Control Res Ctr, Gheorghe Asachi Tech Univ Iasi, Fac Automat Control & Comp Engn, Dunarea Jos Univ Galati, Fac Control Syst Comp Elect & Elect Engn, Minist Educ & Res Romania, Natl Authority Sci Res & Innovat, IEEE Romanian Sect, Romanian Acad Tech Sci, Romanian Soc Automat & Tech Informat
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- 2016
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7. Multi-objective control of full-vehicle suspensions: A case study
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Hüseyin Akçay, Semiha Turkay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkay, Semiha, and Akçay, Hüseyin
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Engineering ,Mathematical optimization ,Optimization problem ,business.industry ,Control (management) ,Linear matrix inequality ,General Medicine ,Linear matrix ,Active suspension ,Active Suspension ,Suspension (motorcycle) ,Multi-Objective Control ,Full-Car ,Range (mathematics) ,Control theory ,Linear Matrix Inequality ,business - Abstract
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 feedback solution is obtained by using linear matrix inequalities. Next, the multi-objective control problem is re-formulated as a non-convex and non-smooth optimization problem with controller order restricted to be less than the vehicle model order. For a range of orders, controllers are synthesized by using the HIFOO toolbox. The efficacy of the presented procedures are illustrated by design examples, The authors would like to thank S. Gümü¸ssoy for valuable comments on applying the HIFOO toolbox. This work was supported by the Scientific & Technological Research Council of Turkey under Grant 106E108.
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- 2011
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8. Aspects of achievable performance for quarter-car active suspensions
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Hüseyin Akçay, Semilla Türkay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, and Akçay, Hüseyin
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Engineering ,Acoustics and Ultrasonics ,business.industry ,Mechanical Engineering ,Condensed Matter Physics ,Linear-quadratic-Gaussian control ,Active suspension ,Transfer function ,Feedback regulation ,Vertical acceleration ,Factorization ,Mechanics of Materials ,Control theory ,Deflection (engineering) ,Suspension (vehicle) ,business - Abstract
WOS: 000253598100027, 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 vertical acceleration and/or the suspension travel measurements for feedback. The derived constraints complement the similar constraints in the literature. By using the factorization approach to feedback stability, it is shown that tire damping couples the motions of the sprung and unsprung masses; and eliminates a constraint at the wheel-hop frequency. The influence of tire damping on the design of an active suspension system for a quarter-car model by a mixture of the LQG methodology and the interpolation approach is also illustrated
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- 2008
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9. Subspace-Based Identification of Acoustic Noise Spectra in Induction Motors
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Hüseyin Akçay, Emin Germen, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Akçay, Hüseyin, and Germen, Emin
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Engineering ,Identification ,business.industry ,Microphone ,Acoustics ,Energy Engineering and Power Technology ,Estimator ,Spectral line ,Cross-Power Spectrum ,Noise ,Identification (information) ,Subspace Method ,Electrical and Electronic Engineering ,business ,Cross-spectrum ,Subspace topology ,Induction motor ,Acoustic Noise ,Induction Motor - Abstract
WOS: 000352056300004, In this paper, we study the identification of acoustic noise spectra in induction motors by using a recently developed frequency-domain cross-power spectrum estimation algorithm. This algorithm is a noniterative high-resolution spectral estimator. In a test rig, from multiple experiments sound data are collected by an array of five-microphones placed hemispherically around motors in a reverberant and noisy room. In order to explore the issue of assembly micromisalignments, each motor is removed from the test rig and then replaced, after which the experiment is then repeated. The identification algorithm is used to detect changes in acoustic noise spectra of induction motors due to mechanical and electrical faults most frequently encountered in industry. Not only the autopower spectra of the individual microphones, but also the cross-power spectra of the microphone pairs are estimated. As a by product, it is demonstrated that one microphone is sufficient to identify noise spectra. The estimated acoustic spectra, or more compactly statistics extracted from them, can be used in the development of preventive maintenance programs for induction motors in service.
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- 2015
10. Modeling of hysteresis and power losses in transformer laminations
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D. G. Ece, Hüseyin Akçay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, and Akçay, Hüseyin
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Materials science ,business.industry ,Hysteresis ,Lamination ,Electrical engineering ,Energy Engineering and Power Technology ,Mechanical engineering ,Eddy Current ,Transformer Modeling ,Magnetic hysteresis ,law.invention ,Lamination (geology) ,law ,Electromagnetic coil ,Eddy current ,Electrical and Electronic Engineering ,business ,Transformer - Abstract
WOS: 000182225400022, 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 hysteresis and eddy current losses.
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- 2003
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11. Active suspension design based on linear-matrix inequalities and fixed-order controllers
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Semiha Turkay, Hüseyin Akçay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkay, Semiha, and Akçay, Hüseyin
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Vehicle dynamics ,Engineering ,Optimization problem ,business.industry ,Control theory ,Convex optimization ,Order (ring theory) ,Linear matrix ,business ,Active suspension ,Parametric statistics - Abstract
Mediterranean Control Association, 2011 19th Mediterranean Conference on Control and Automation, MED 2011 -- 20 June 2011 through 23 June 2011 -- Corfu -- 86335, In this paper, influence of tire damping on multi-objective control of quarter-car suspensions excited by random road disturbances is studied. The active suspension design problem is first formulated as a mixed H 2/? synthesis problem and this convex problem is solved using linear matrix inequalities. Next, the control design problem is re-formulated as a non-convex and non-smooth optimization problem with fixed order controllers and solved by using the recently developed HIFOO toolbox. Parametric studies show that tire damping can seriously impact closed-loop performance of actively controlled quarter-car models
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- 2011
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12. Influence of tire damping on multi-objective control of quarter-car suspensions
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Semiha Turkay, Hüseyin Akçay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Akçay, Hüseyin, and Türkay, Semiha
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Engineering ,business.industry ,Linear matrix inequality ,Uncertain systems ,H control ,Linear matrix ,Active suspension ,Active Suspension ,Multi-Objective Control ,Vehicle dynamics ,Acceleration ,Control theory ,Quarter-Car ,Tire Damping ,Linear Matrix Inequality ,business ,Suspension (vehicle) - Abstract
The Institute of Electrical and Electronics Engineers (IEEE);IEEE Industrial Electronics Society (IES);Universidad Tecnica Federico Santa Maria;University of Seville;Ilustre Municipalidad de Vina del Mar, IEEE-ICIT 2010 International Conference on Industrial Technology, ICIT 2010 -- 14 March 2010 through 17 March 2010 -- Vina del Mar -- 80889, In this paper, multi-objective control of a quartercar suspension system subjected to random road disturbances is studied. The active suspension problem is formulated as a mixed H2/H? synthesis problem and solved using linear matrix inequalities. It is first demonstrated that the influence of tire damping on the closed-loop performance can be significant. Then, this result is extended to suspension models with polytopic tire damping uncertainties
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- 2010
13. Active suspension design for an idealized truck cabin
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Hüseyin Akçay, Semiha Turkay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Akçay, Hüseyin, and Türkay, Semiha
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Truck ,Engineering ,business.industry ,Truck Cabin ,Design methods ,business ,Active suspension ,Active Suspension ,Lqg ,Automotive engineering - Abstract
European Union Control Association (EUCA);IEEE CSS;IFAC;MTA SZTAKI;National Office for Research and Technology (NKTH), 2009 10th European Control Conference, ECC 2009 -- 23 August 2009 through 26 August 2009 -- -- 111795, In this paper, a prototype three-degree-of-freedom cabin model for a commercial truck is derived to study ride motions of the cabin under random road excitations. An active suspension system is designed using the linear-quadratic-Gaussian design methodology. The simulation results show the effectiveness of this methodology
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- 2009
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14. Influence of tire damping on the ride performance potential of quarter-car active suspensions
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Hüseyin Akçay, Semiha Turkay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkay, Semiha, and Akçay, Hüseyin
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Engineering ,medicine.diagnostic_test ,business.industry ,medicine ,food and beverages ,Computed tomography ,Active suspension ,business ,human activities ,Automotive engineering ,Current transformer - Abstract
47th IEEE Conference on Decision and Control -- DEC 09-11, 2008 -- IEEE Control Syst Soc (CSS), Cancun, MEXICO, WOS: 000307311604084, In this paper, performance limitations are studied for a quarter-car active suspension system excited by sinusoidal or random road disturbances. It is demonstrated that the influence of tire damping on the closed-loop performance of the active suspension system can be significant., IEEE, Soc Ind & Appl Math (SIAM), Inst Operat Res & Management Sci (INFORMS), Japanese Soc Instrument & Control Engn (SICE), European Union Control Assoc (EUCA), Taylor & Francis Grp, StatoilHydro
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- 2008
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15. Influence of tire damping on the H2 optimally designed half-car active suspensions
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S. Turkay, H. Akcay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkay, Semiha, and Akçay, Hüseyin
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Engineering ,business.industry ,GeneralLiterature_INTRODUCTORYANDSURVEY ,Acoustics ,InformationSystems_INFORMATIONSYSTEMSAPPLICATIONS ,Tire balance ,Temporal correlation ,Optimal control ,Control theory ,ComputingMethodologies_DOCUMENTANDTEXTPROCESSING ,Hardware_ARITHMETICANDLOGICSTRUCTURES ,Suspension (vehicle) ,business ,Excitation ,Slip (vehicle dynamics) - Abstract
IEEE International Conference on Control Applications -- SEP 03-05, 2008 -- San Antonio, CA, WOS: 000263577800064, In this paper, the rms responses of the heave and pitch accelerations, the suspension travels, and the tire deflections of a half-car model excited by random road inputs are studied. The road excitation at the front wheel is modelled by a first-order linear shape filter driven by white-noise input; and the temporal correlation between the front and the rear wheels is predicted by a second order Pade filter. It is demonstrated that the effect of tire damping on the root-mean-square responses of actively controlled half-car suspension system can be significant, in particular, at high vehicle velocities., IEEE
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- 2008
16. RMS Performance Limitations and Constraints for Quarter-Car Active Suspensions
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Semiha Turkay, Hüseyin Akçay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Akçay, Hüseyin, and Türkay, Semiha
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Engineering ,Automatic control ,Control theory ,business.industry ,Deflection (engineering) ,Colors of noise ,Car model ,Physics::Accelerator Physics ,Sprung mass ,business ,Vertical acceleration - Abstract
16th Mediterranean Conference on Control and Automation -- JUN 25-27, 2008 -- Ajaccio, FRANCE, WOS: 000261534400011, 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 the motions of the sprung and unsprung masses eliminates a wheel-hop mode constraint; thus reduces the rms sprung mass vertical acceleration without increasing the rms suspension travel and the rms tire deflection., IEEE
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- 2008
17. Effect of tire damping on the ride performance potential of active suspension systems
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Semiha Turkay, Hüseyin Akçay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkay, Semiha, and Akçay, Hüseyin
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Engineering ,Tire Deflection ,business.industry ,Tire balance ,Linear-quadratic-Gaussian control ,Active suspension ,Transfer function ,Active Suspension ,Vertical acceleration ,Matrix decomposition ,Acceleration control ,Achievable Performance ,Control theory ,Deflection (engineering) ,business - Abstract
Annual Conference on the Society-of-Instrument-and-Control-Engineers -- SEP 17-20, 2007 -- Kagawa Univ, Takamatsu, JAPAN, WOS: 000255608501083, 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 vertical acceleration and/or the suspension travel measurements for feedback. The derived constraints complement the similar constraints in the literature. By using the factorization approach to feedback stability, it is shown that tire damping couples the motions of the sprung and unsprung masses; and eliminates a constraint at the wheelhop frequency. The influence of tire damping on the design of an active suspension system for a quarter-car model by a mixture of the LQG methodology and the interpolation approach is illustrated., IEEE Ind Electron Soc, IEEE Robot & Automat Soc, IEEE Control Syst Soc, IEEE Syst, Man & Cybernet Soc, Instrumentat, Syst & Automat Soc, Inst Control, Robot, & Syst, China Instrument & Control Soc, Chinese Assoc Automat, Chinese Automat Control Soc, Int Measurement Confederat, IEEE Japan Council, IFAC NMO, Inst Elect Engn Japan
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- 2007
18. On the performance limitations of quarter-car active suspension models
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Hüseyin Akçay, Semiha Turkay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkay, Semiha, and Akçay, Hüseyin
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Engineering ,business.industry ,Constraint (computer-aided design) ,Control engineering ,ComputerApplications_COMPUTERSINOTHERSYSTEMS ,Linear-quadratic-Gaussian control ,Active suspension ,Stability (probability) ,Transfer function ,Active Suspension ,Factorization ,Achievable Performance ,Control theory ,Tire Damping ,ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS ,business ,Complement (set theory) - Abstract
TC7.1 - Automotive Control;ASME Dynamic Systems and Control Division;IEEE Technical Committee on Automotive Controls;American Automatic Control Council, 5th IFAC Symposium on Advances in Automotive Control, AAC 2007 -- 20 August 2007 through 22 August 2007 -- Aptos, CA -- 85818, 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 factorization approach to feedback stability, it is also shown that tire damping couples the motions of the sprung and unsprung masses; and eliminates a wheelhop constraint. The influence of tire damping on the design of an active suspension system for a quarter-car model by the LQG method is illustrated., 1 This work was supported in part by the Scientific & Technological Research Council of Turkey under Grant 106E108.
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- 2007
19. A study of random vibration characteristics of the quarter-car model
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Hüseyin Akçay, Semiha Turkay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkay, Semiha, and Akçay, Hüseyin
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Engineering ,Matching (statistics) ,Traverse ,Acoustics and Ultrasonics ,business.industry ,Mechanical Engineering ,Filter (signal processing) ,Condensed Matter Physics ,Suspension (motorcycle) ,Mechanics of Materials ,Colors of noise ,Control theory ,Random vibration ,business ,Telecommunications ,Subspace topology ,Variable (mathematics) - Abstract
WOS: 000227664700005, In this paper, the quarter-car model is used to study the response of the vehicle to profile imposed excitation with randomly varying traverse velocity and variable vehicle forward velocity. Root-mean-square response of the vehicle to white and colored noise velocity road inputs is analyzed. In the latter case, a recently developed subspace-based identification algorithm is used to design a linear shape filter with output spectrum matching the measured road spectrum. The linear shape filter is used in constructing charts that illustrate the trade-offs among the passenger comfort, the road-holding, and the suspension travel as functions of the vehicle forward velocity
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- 2005
20. An analysis of transformer excitation current under nonsinusoidal supply voltage
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D. G. Ece, Hüseyin Akçay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Ece, Doğan Gökhan, and Akçay, Hüseyin
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Isolation transformer ,Materials science ,business.industry ,Hysteresis ,Flyback transformer ,Harmonics ,Transformer Excitation Current ,Electrical engineering ,Hardware_PERFORMANCEANDRELIABILITY ,Distribution transformer ,Current transformer ,Hardware_INTEGRATEDCIRCUITS ,Autotransformer ,Electronic engineering ,Energy efficient transformer ,Electrical and Electronic Engineering ,business ,Transformer effect ,Delta-wye transformer ,Instrumentation ,Nonsinusoidal Supply Voltage - Abstract
WOS: 000180712400036, 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 harmonic composition of supply voltage.
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- 2002
21. Stochastic optimal control of truck cabin with active suspension
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Hüseyin Akçay, Semiha Turkay, Anadolu Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Akçay, Hüseyin, and Türkay, Semiha
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Heavy Vehicle ,Truck ,Stochastic control ,Engineering ,business.industry ,Mechanical Engineering ,Control engineering ,Ride quality ,Linear-quadratic-Gaussian control ,Active suspension ,Active Suspension ,Random Vibration ,Vibration ,Control theory ,Automotive Engineering ,Hifoo Control ,Random vibration ,Truck Cabin ,Linear-Quadratic-Gaussian ,business - Abstract
WOS: 000345814900001, In this paper, a three-degree-of-freedom cabin model for a commercial truck is derived to study ride motions of the cabin under random road excitations. First, an active suspension system is designed using the linear-Nquadratic-Gaussian (LQG) design methodology. Then, the LQG design is reduced by the method of balanced truncation. The simulation results show that both the LQG design and the truncated controller effectively suppress the cabin vibrations induced by road unevenness. Next, the control design problem is re-formulated as a non-convex and non-smooth optimisation problem with fixed-order controllers and solved by the recently developed H-infinity fixed-order optimisation (HIFOO) toolbox., Scientific & Technological Research Council of Turkey [106E108]; Ford Otosan, Turkey Inc., The authors thank S. Gumussoy for valuable comments on applying the HIFOO toolbox. This work was supported by the Scientific & Technological Research Council of Turkey under Grant 106E108. Ford Otosan, Turkey Inc. is gratefully acknowledged for funding initial stage of this work.
- Published
- 2014
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