Browsing by Keywords "Feedback control"

Now showing items 1-20 of 20

    • Experimental results and bifurcation analysis on scaled feedback control for subsonic cavity flows 

      Yuan, X.; Caraballo, E.; Debiasi, M.; Little, J.; Serrani, A.; Özbay, Hitay; Samimy, M. (IEEE, 2006)
      In this paper, we present the latest results of our ongoing research activities in the development of reduced-order models based feedback control of subsonic cavity flows. The model was developed using the Proper Orthogonal ...

    • Experimental study of linear closed-loop control of subsonic cavity flow 

      Yan P.; Debiasi, M.; Yuan X.; Little J.; Özbay, Hitay; Samimy, M. (2006)
      A study is presented of the modeling and implementation of different concepts for linear feedback control of a single-mode resonance shallow cavity flow. When a physics-based linear model is used for cavity pressure ...

    • Feedback control design for subsonic cavity flows 

      Yuan X.; Caraballo, E.; Little J.; Debiasi, M.; Serrani, A.; Özbay, Hitay; Myatt J.H.; Samimy, M. (2009)
      A benchmark problem in active aerodynamic flow control, suppression of strong pressure oscillations induced by flow over a shallow cavity, is addressed in this paper. Proper orthogonal decomposition and Galerkin projection ...

    • H∞-performance analysis of robust controllers designed for AQM 

      Yan, P.; Özbay, Hitay (IEEE, 2003)
      It has been shown that the TCP connections through the congested routers with the Active Queue Management (AQM) can be modeled as a nonlinear feedback system. In this paper, we design H∞ robust controllers for AQM based ...

    • Infinite dimensional and reduced order observers for Burgers equation 

      Efe, M. Ö.; Özbay, Hitay; Samimy, M. (Taylor & Francis, 2005)
      Obtaining a representative model in feedback control system design problems is a key step and is generally a challenge. For spatially continuous systems, it becomes more difficult as the dynamics is infinite dimensional ...

    • Modeling and feedback control for subsonic cavity flows: a collaborative approach 

      Yan, P.; Debiasi, M.; Yuan, X.; Caraballo, E.; Serrani, A.; Özbay, Hitay; Myatt, J. M.; Samimy, M. (IEEE, 2005)
      Feedback control of aerodynamic flows is attracting the attention of researchers from a wide spectrum of specialties, because of its interdisciplinary nature and the challenges inherent to the problem. One of the main goals ...

    • Modelling and control of a wind energy conversion system 

      Saribatir, B. M.; Sezer, M. E. (Taylor & Francis, 1987)
      The dynamical model of a novel low power wind energy conversion system consisting of a wind turbine, an induction generator, a PWM a.c. inverter and a d.c. battery group is obtained. A feedback control law is developed to ...

    • Observer based control of chaos 

      Solak, Ercan; Morgül, Ömer; Ersoy, Umut (IEEE, 1997-08)
      In this work we consider the control of forced chaotic oscillators. To obtain any desirable behavior, the system parameters are effectively modified using state feedback. The system states used in the feedback are estimated ...

    • Observer based friction cancellation in mechanical systems 

      Odabaş, Caner; Morgül, Ömer (IEEE, 2014-10)
      An adaptive nonlinear observer based friction compensation for a special time delayed system is presented in this paper. Considering existing delay, an available Coulomb observer is modified and closed loop system is formed ...

    • On the design of AQM supporting TCP flows using robust control theory 

      Quet, P-F.; Özbay, Hitay (IEEE, 2004)
      Recently it has been shown that the active queue management schemes implemented in the routers of communication networks supporting transmission control protocol (TCP) flows can be modeled as a feedback control system. ...

    • Reduced-order model-based feedback controller design for subsonic cavity flows 

      Yuan, X.; Caraballo, E.; Yan, P.; Özbay, Hitay; Serrani, A.; DeBonis, J.; Myatt, J. H.; Samimy, M. (American Institute of Aeronautics and Astronautics, 2005-01)
      This paper explores feedback controller design for cavity flows based on reduced-order models derived using Proper Orthogonal Decomposition (POD) along with Galerkin projection method. Our preliminary analysis shows that ...

    • A relevance feedback technique for multimodal retrieval of news videos 

      Aksoy, Selim; Çavuş Özge (IEEE, 2005-11)
      Content-based retrieval in news video databases has become an important task with the availability of large quantities of data in both public and proprietary archives. We describe a relevance feedback technique that captures ...

    • Robust adaptive stabilization of a class of systems under structured nonlinear perturbations with application to interconnected systems 

      Wei, R.; Sezer, M. Erol; Ocalı, Ogan (Taylor & Francis, 1996)
      This paper presents a stabilization scheme for a dass of multi-input/multioutput systems with nonlinear additive perturbations using high-gain adaptive controllers The nominal system is assumed to satisfy some mild conditions ...

    • Robust stabilization of the wave equation against small delays 

      Morgül, Ömer (IEEE, 1994)
      In this paper we consider a system which can be modeled by (undamped) wave equation in a bounded domain. We assume that the system is fixed at one end and is controlled by a boundary controller at the other end. We also ...

    • Sensitivity minimization by stable controllers for a class of unstable time-delay systems 

      Gümüşsoy, S.; Özbay, Hitay (IEEE, 2006)
      In this paper sensitivity minimization problem is considered for a class of unstable time delay systems. Our goal is to find a stable controller stabilizing the feedback system and giving rise to smallest H∞ norm for the ...

    • Stability and control of a compass gait model walking with series-elastic ankle actuation 

      Kerimoğlu, Deniz (Bilkent University, 2017-11)
      Passive dynamic walking models are capable of capturing basic properties of walking behaviors and can generate stable human-like walking without any actuation on downhill surfaces. The passive compass gait model is among ...

    • Stability and control of planar compass gait walking with series-elastic ankle actuation 

      Kerimoğlu, D.; Morgül, Ö.; Saranli, U. (Sage Publications Ltd., 2017)
      Passive dynamic walking models are capable of capturing basic properties of walking behaviours and can generate stable human-like walking without any actuation on inclined surfaces. The passive compass gait model is among ...

    • Stability of delayed feedback controllers for discrete time systems 

      Morgül, Ömer (IEEE, 2003)
      We consider the delayed feedback control (DFC) scheme for one dimensional discrete time systems. To analyze the stability, we construct a map whose fixed points correspond to the periodic orbits of the system to be controlled. ...

    • A stability result for delayed feedback controllers 

      Morgül, Ömer (IEEE, 2003)
      We consider the delayed feedback control (DFC) scheme for one dimensional discrete time systems. To analyze the stability, we construct a map whose fixed points correspond to the periodic orbits of the system to be controlled. ...

    • Switching resilient PI controllers for active queue management of TCP flows 

      Üstebay, Deniz; Özbay, Hitay (IEEE, 2007)
      Active Queue Management (AQM) is used in computer networks to increase link utilization with less queueing delays. The fluid flow model or TCP based on delay differential equations supplies the mathematical background for ...