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Sökning: LAR1:umu > Konferensbidrag > Lunds universitet > Robertsson Anders

  • Resultat 1-10 av 13
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1.
  • Andersson, Alina, et al. (författare)
  • Analytic Parameterization of Stabilizing Controllers for the Surge Subsystem of the Moore-Greitzer Compressor Model
  • 2013
  • Ingår i: Proc. 2013 American Control Conference (ACC2013). - 0743-1619. - 9781479901777 ; , s. 5257-5262
  • Konferensbidrag (refereegranskat)abstract
    • This paper is based on a new procedure for dynamic output feedback design for systems with nonlinearities satisfying quadratic constraints. The new procedure is motivated by the challenges of output feedback control design for the 3-state Moore-Greitzer compressor model. First, we use conditions for stability of a transformed system and the associated matching conditions to find the data of the stabilizing controllers for the surge subsystem. Second, using the set of stabilizing controllers satisfying the given constraints for the closed-loop system with the dynamic output feedback controller we made optimization over the parameter set. We present the data of the stabilizing controllers and the new constraints for the corresponding parameters. The contributions in this paper are simplified conditions for the synthesis and optimization over the control parameter set.
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2.
  • Andersson, Alina, et al. (författare)
  • Robustness of the Moore-Greitzer Compressor Model's Surge Subsystem with New Dynamic Output Feedback Controllers
  • 2014. - 3
  • Ingår i: 19th IFAC World Congress. - : Elsevier. - 2405-8963. - 9783902823625 ; 47, s. 3690-3695
  • Konferensbidrag (refereegranskat)abstract
    • This work presents an extension of a design procedure for dynamic output feedback design for systems with nonlinearities satisfying quadratic constraints. In this work we used an axial gas compressor model described by the 3-state Moore-Greitzer compressor model (MG) that has some challenges for output feedback control design (Planovsky and Nikolaev 1990), (Rubanova 2013). The more general constraints for the investigation of the robustness with respect to parametric uncertainties and measurement noise are shown.
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3.
  • Andersson, Alina, et al. (författare)
  • Sufficient Conditions for Dynamic Stabilization of 3-State Moore-Greitzer Compressor Model
  • 2015
  • Ingår i: 2015 IEEE 54th Annual Conference on Decision and Control (CDC). - 9781479978861 - 9781479978847 ; , s. 4394-4399
  • Konferensbidrag (refereegranskat)abstract
    • We consider the classical 3-state Moore-Greitzer model, which is commonly used for approximating dynamics of deviations of flow and pressure variables in an axial compressor from their nominal steady-state values. The linearization of the nonlinear system is not controllable and, therefore, even local asymptotic stability cannot be achieved using methods of linear control theory. We propose a family of parametrized partialstate feedback control laws and derive sufficient conditions to guarantee global asymptotic stability of the closed-loop system. The stability analysis uses the integral quadratic constraints technique for the case of non-strict frequency condition and novel arguments for characterization of omega-limit sets.
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4.
  • Freidovich, Leonid, et al. (författare)
  • Friction Compensation Based on LuGre Model
  • 2006
  • Ingår i: Proc. 45th IEEE Conf. Decision & Control (CDC 2006). - New York : IEEE. ; , s. 3837-3842
  • Konferensbidrag (refereegranskat)abstract
    • We consider a tracking problem for mechanical systems. It is assumed that feedback controller is designed neglecting some disturbances, which could be approximately modeled by a dynamic LuGre friction model. We are interested to derive an additive observer-based compensator to annihilate or reduce the influence of such a disturbance. We exploit a recently suggested approach for observer design for LuGre friction-model-based compensation. In order to follow this technique, it is necessary to know the Lyapunov function for the unperturbed system, parameters of the dynamic friction model, and to have certain structural property satisfied. The case when this property is passivity with respect to the matching disturbance related to the given Lyapunov function is illustrated in the paper with an example of a DC-motor. The main contribution is some new insights into numerical real time implementation of friction compensators for various LuGre type models. The other contribution, built upon the main one, is experimental verification of the suggested observer design procedure.
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5.
  • Kihl, Maria, et al. (författare)
  • The Challenge of Cloud Control
  • 2013
  • Ingår i: The 8th International Workshop on Feedback Computing (Feedback Computing '13).
  • Konferensbidrag (refereegranskat)abstract
    • Today’s cloud data center infrastructures are not even near being able to cope with the enormous and rapidly vary-ing capacity demands that will be reality in a near future. So far, very little is understood about how to transform today’s data centers (being large, power-hungry facilities, and operated through heroic efforts by numerous adminis-trators) into a self-managed, dynamic, and dependable infrastructure, constantly delivering expected QoS with rea-sonable operation costs and acceptable carbon footprint for large-scale services with sometimes dramatic variations in capacity demands. In this paper, we discuss some of the major challenges for resource-optimized cloud data cen-ter. We propose a new research area called Cloud Control, which is a control theoretic approach to a range of cloud management problems, aiming to transform today´s static and energy consuming cloud data centers into self-managed, dynamic, and dependable infrastructures, constantly delivering expected quality of service with acceptable operation costs and carbon footprint for large-scale services with varying capacity demands.
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6.
  • Shiriaev, Anton, et al. (författare)
  • Coordinating control for a fleet of underactuated ships
  • 2006
  • Ingår i: GROUP COORDINATION AND COOPERATIVE CONTROL. - Berlin/Heidelberg : Springer-Verlag. - 3540334688 ; 336, s. 233-250
  • Konferensbidrag (refereegranskat)abstract
    • We consider design of coordinating controllers for a fleet of underactuated ships. Each ship is modeled as a mechanical system with 3 degrees of freedom and 2 control inputs, which are the propeller thrust and the angle of the rudder; presence of lumped environmental forces is assumed. The proposed motion planning procedure relies. on properties of an auxiliary explicitly constructed second order dynamical system. We propose a procedure for motion planning for the whole fleet and for design of a coordinating feedback controller, which stabilizes the motion. In the case when geometric paths for ship motions are given, following our approach, we obtain a description of all feasible motions of the fleet along these paths. In addition, it is shown how to design controllers to counteract environmental forces while remaining on the paths. As a side result, we provide some modifications and give some insights into the weather optimal positioning control design, introduced in [1] for a fully actuated ship model.
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7.
  • Shiriaev, Anton, et al. (författare)
  • Explicit formulas for general integrals of motion for a class of mechanical systems subject to virtual constraints
  • 2004
  • Ingår i: 2004 43rd IEEE conference on decision and control (CDC), vols 1-5. - New York : IEEE conference proceedings. - 0780386825 ; 2, s. 1158-1163
  • Konferensbidrag (refereegranskat)abstract
    • The paper suggests an explicit form of a general integral of motion for some classes of dynamical systems including n-degree-of-freedom mechanical systems subject to (n - 1) virtual holonomic constraints. The computation of this integral opens several possibilities for generating and further exponential orbital stabilization of solutions in nonlinear feedback systems. An illustrative example is given.
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8.
  • Shiriaev, Anton, et al. (författare)
  • Output feedback stabilization of the Moore-Greitzer compressor model
  • 2005
  • Ingår i: 2005 44th IEEE Conference on Decision and Control & European Control Conference, Vols 1-8. - 0780395670 - 0780395689 ; , s. 1102-1107
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents a number of facts related to the output feedback stabilization of the Moore-Greitzer compressor model. We show that quadratic feedback stabilization of the surge subsystem of the three-state Moore-Greitzer compressor model, which ensures absence of additional equilibria and cycles in the closed-loop system augmented with stall dynamics, implies convergence of all solutions to the unique equilibrium at the origin. Then some steps in developing such output feedback controller for surge subsystem are discussed.
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9.
  • Shiriaev, Anton S., et al. (författare)
  • Criteria for Global Stability of Coupled Systems with Application to Robust Output Feedback Design for Active Surge Control
  • 2009
  • Ingår i: Proc. 2009 IEEE Multi-conference on Systems and Control (MSC 2009). ; , s. 1021-1026
  • Konferensbidrag (refereegranskat)abstract
    • The well-known and commonly accepted finite dimensional model qualitatively describing surge instabilities in centrifugal (and axial) compressors is considered. The problem of global output feedback stabilization for it is solved. The solution relies on two new criteria for global stability proposed for a class of nonlinear systems exploiting quadratic constraints for infinite sector nonlinearities. Two families of robust output feedback controllers are proposed. Controllers from the first family ensure global exponential stabilization. The ones from the second family provide integral action but only ensure local exponential and global asymptotic stability. Performance is verified by simulations.
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10.
  • Shiriaev, Anton S, et al. (författare)
  • Periodic motion planning for virtually constrained (hybrid) mechanical systems
  • 2005
  • Ingår i: 2005 44th IEEE conference on decision and control & European control conference, vols 1-8. - New York : IEEE conference proceedings. - 0780395670 - 0780395689 ; , s. 4035-4040
  • Konferensbidrag (refereegranskat)abstract
    • The paper presents sufficient and almost necessary conditions for the presence of periodic solutions for zero dynamics of virtually constrained under-actuated Euler-Lagrange system. This result is further extended to detect periodic solutions for a class of hybrid systems in the plane and analyze their orbital stability and instability. Illustrative examples are given.
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  • Resultat 1-10 av 13

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