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Control Systems Technology, IEEE Transactions on

Issue 5 • Date Sept. 2002

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Displaying Results 1 - 16 of 16
  • Addendum to "systematic control of a class of nonlinear systems with application to electrohydraulic cylinder pressure control"

    Publication Year: 2002 , Page(s): 756
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (157 KB) |  | HTML iconHTML  

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  • Effects of control structure on performance for an automotive powertrain with a continuously variable transmission

    Publication Year: 2002 , Page(s): 701 - 708
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (281 KB)  

    The wheel speed control problem of an automotive powertrain equipped with a conventional spark-ignition engine directly connected to a continuously variable transmission (CVT) and an electronic throttle is considered. We revisit the work by Guzzella and Schmid (1995) and show that the control structure that dedicates the throttle actuator to maintaining engine operation at the maximum fuel efficient operating points results in a single-input-two-output system that presents a fundamental limitation in the achievable wheel speed response. The limitation arises from the nonminimum phase (NMP) zero in the transfer function from the CVT ratio rate to the vehicle wheel speed. We relax the requirements on the fuel efficient operation and employ the electronic throttle as a second actuator for the wheel speed regulation problem. The resulting two-input-two-output control structure is then analyzed to determine how to mitigate the limitations associated with the NMP zero. Simulations show that the multivariable strategy improves the system performance because it produces minimum phase behavior without large transient deviations from the optimal fuel economy operation View full abstract»

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  • Speed-gradient approach to torque and air-to-fuel ratio control in DISC engines

    Publication Year: 2002 , Page(s): 671 - 678
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (301 KB) |  | HTML iconHTML  

    Applies a Lyapunov design technique, the so-called speed-gradient approach, to coordinated air-to-fuel ratio and torque control in direct injection stratified charge gasoline engines. The technique is based on dynamic minimization of a performance function. It is demonstrated how the closed-loop response of this nonlinear and strongly coupled system can be shaped via the adjustment of the weights in the performance function and how the constraints that protect the operating envelope of the engine can be included through the augmentation of a barrier function. A practical numerical procedure is proposed and used to check the closed-loop stability conditions in this application View full abstract»

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  • Model-based diagnosis of an automotive engine using several types of fault models

    Publication Year: 2002 , Page(s): 679 - 689
    Cited by:  Papers (40)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (409 KB) |  | HTML iconHTML  

    Automotive engines is an important application for model-based diagnosis because of legislative regulations. A diagnosis system for the air-intake system of a turbo-charged engine is constructed. The design is made in a systematic way and follows a framework of hypothesis testing. Different types of sensor faults and leakages are considered. It is shown how many different types of fault models, e.g., additive and multiplicative faults, can be used within one common diagnosis system, and using the same underlying design principle. The diagnosis system is experimentally validated on a real engine using industry-standard dynamic test-cycles View full abstract»

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  • Multivariable robust controller design for a boiler system

    Publication Year: 2002 , Page(s): 735 - 742
    Cited by:  Papers (27)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (282 KB) |  | HTML iconHTML  

    In an industrial boiler system, multiloop (decentralized) proportional-integral (PI) control is used because of its implementational advantages. We show that such control schemes sacrifice robustness and performance of the overall system. In particular, under normal boiler operating conditions, we design a robust multivariable controller using H loop-shaping techniques; for consideration in implementation, we then reduce this controller to a multivariable PI controller. Both the H controller and its PI approximation are tested extensively in letdown the frequency domain as well as in the time domain, using a valve complex nonlinear simulation software; the results show that the designed controllers are superior in robustness and performance to the existing multiloop controller View full abstract»

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  • Observer-based control of vortex motion in a combustor recirculation region

    Publication Year: 2002 , Page(s): 749 - 755
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (266 KB) |  | HTML iconHTML  

    Established paradigms for observers design are yet a missing component in efforts to introduce feedback control of turbulent flows. This case study concerns tracking a reference orbit in a combustor recirculation zone. Actuation is by perturbations of a corner potential, and the sensed output is fluid velocity at a single boundary point. Control design is based on a single vortex model. In recognition of unquantified discrepancies between actual dynamics and the model, a simple constant gain design is a guiding principle. This restricts pointwise vortex-position estimates to a neighborhood of the rest point. Cruder information on Hamiltonian energy dynamics is obtained directly from the sensed signal, during larger deviations, and is used in a dissipative integral feedback, driving the vortex into the observable neighborhood View full abstract»

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  • Radar cross-section reduction via route planning and intelligent control

    Publication Year: 2002 , Page(s): 696 - 700
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB) |  | HTML iconHTML  

    Establishes a methodology for minimizing the peak and/or aggregate radar cross sections (RCSs) of autonomous precision guided munitions (APGMs) as they ingress to a selected target through a radar threat environment. This research demonstrates how route planning may be combined with the simultaneous specification of aerodynamically feasible yaw and bank angles to significantly reduce APGM observability. The approach described in the paper has the potential to considerably enhance APGM effectiveness against enemy defense systems View full abstract»

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  • On stability margins of the Fiat Dedra engine model

    Publication Year: 2002 , Page(s): 690 - 695
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (251 KB) |  | HTML iconHTML  

    We evaluate the stability margin of a Fiat Dedra engine model to explore possible applications of theoretical achievements in the parametric approach to robust control problems. The study is based on two versions of the model with uncertainties. One is the original model, which has a multilinear characteristic polynomial, while the other is an affine-linearized model which is obtained by the affine linearization technique proposed in the paper. By applying some newly developed theoretical tools in the literature, the stability margins of the affine-linearized model in terms of the 𝓁 norm and the 𝓁2 norm and the stability margin of the original model in terms of the 𝓁 norm are obtained View full abstract»

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  • Active control of underwater installation

    Publication Year: 2002 , Page(s): 743 - 748
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (267 KB)  

    An augmented impedance control scheme is proposed together with passive heave compensation to achieve higher operability on offshore underwater installation. The dynamics of the controller, the crane, the water surface in the moonpool, and a detailed mathematical model of the hydrodynamic loads and load effects on the object hitting the water surface and proceeding through the splash zone are included. Stability of the controller is proven, and simulation results with relevant full-scale parameters are included View full abstract»

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  • Proper orthogonal decomposition-based control of transverse beam vibrations: experimental implementation

    Publication Year: 2002 , Page(s): 717 - 726
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    Linear quadratic Gaussian (LQG) compensator control of transverse vibrations was implemented on an aluminum cantilevered beam in a "smart structure" paradigm. The beam was mounted with two self-sensing self-actuating piezoceramic patches. The Euler-Bernoulli beam equation was discretized via a Galerkin type approximation (referred to as the full-order model). To reduce the size of the resulting finite-dimensional approximating system, the proper orthogonal decomposition (POD) was employed as a reduced basis method. A reduction of dimension from 34 to 2 was obtained through the model reduction technique. Feedback control based on the reduced order system was implemented in real time using a dSpace DS1103 control system. Experimental results indicate that POD-based control achieves comparable control attenuation with full-order model-based control View full abstract»

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  • A miniaturized levitation system with motion control using a piezoelectric actuator

    Publication Year: 2002 , Page(s): 666 - 670
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (243 KB) |  | HTML iconHTML  

    A microlevitation system utilizing a permanent magnet attached to a linear actuator is proposed for the purpose of micromanipulation. The air gap length between a small iron ball and a permanent magnet is adjusted to balance the magnetic force and gravity force. A piezoelectric actuator is used to control the air gap length because of its simple construction and low potential for thermal problems. A small iron ball 2.0 mm in diameter was successfully levitated about 40 μm from the starting position. The time constant was within the range of 20 ms. This success should contribute to future efforts that utilize electrostatic or intermolecular forces for the noncontact suspension View full abstract»

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  • Fixed-order dynamic compensation for axial flow compression systems

    Publication Year: 2002 , Page(s): 727 - 734
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB) |  | HTML iconHTML  

    We develop linear fixed-order (i.e., full and reduced order) pressure rise feedback dynamic compensators for axial flow compressors with throttle valve actuation. Unlike the nonlinear static controllers proposed in the literature possessing gain at all frequencies, the proposed dynamic compensators explicitly account for compressor performance versus sensor accuracy, compressor performance versus processor throughput, and compressor performance versus disturbance rejection. Furthermore, the proposed controller is predicated on only pressure rise measurements, providing a considerable simplification in the sensing architecture over the bifurcation-based and backstepping controllers proposed in the literature View full abstract»

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  • An implementation of the matrix-based supervisory controller of flexible manufacturing systems

    Publication Year: 2002 , Page(s): 709 - 716
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (301 KB) |  | HTML iconHTML  

    Deals with an implementation of a new matrix-based supervisory controller of flexible manufacturing system (FMS). A design method is applied to the laboratory setup of a finite-buffer multiple reentrant flowline FMS which contains one 5-degree of freedom (DOF) robot, few transporters, pistons, and other elements (sensors, programmable logic controller, and personal computers). Control of the FMS is based on a matrix model approach which significantly reduces a computational effort and simplifies conversion of dispatching rules to the software program. The results obtained during experiments have confirmed effectiveness of the matrix-based FMS controller. View full abstract»

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  • MIMO control design for a compact disc player with multiple norm specifications

    Publication Year: 2002 , Page(s): 635 - 645
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (369 KB) |  | HTML iconHTML  

    Investigates the application of norm-based control design techniques to a compact disc (CD) player mechanism. In this control design problem, the main goal is to keep the time-domain amplitude of a tracking error signal bounded in the presence of disturbances and norm-bounded uncertainties. Since the performance specification is given in the time domain while the robustness specification is typically of a frequency-domain nature, we cast this problem into the multiobjective framework for which design techniques based on linear matrix inequalities (LMIs) have been proposed in the literature. The aim of this work is to evaluate the effectiveness of these methods in a real-world control problem through digital implementation of the proposed controllers. In particular, we compare performance and robustness achieved by multivariable generalized H2/H∞ controllers with those achieved by a benchmark multivariable H controller. The comparison is made on the basis of experimental results obtained by digital controller implementation on a multiprocessor system View full abstract»

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  • Design and experimental testing of a robust multivariable controller on a tokamak

    Publication Year: 2002 , Page(s): 646 - 653
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (282 KB) |  | HTML iconHTML  

    Describes the design and the experimental validation of a multivariable digital controller for a Tokamak, the Tokamak a configuration variable (TCV). The design of the controller is based on a linearized model of the plasma confined in the Tokamak. The plant is multiple-input-multiple-output (MIMO) and the various outputs are strongly coupled. Moreover the plant is open-loop unstable. The scope of the controller is to stabilize the plasma and to guarantee some closed-loop performance in terms of decoupling among the plant outputs. The proposed controller is composed of two nested loops: one is devoted to the vertical stabilization, the other, designed using the ℋ technique, guarantees the control of the plasma current and of the plasma shape. After massive simulations, this controller has been successfully tested on the plant. The experimental results show a significant improvement of the performance with respect to those obtained with a proportional integral derivative (PID) MIMO controller, that was used before on the plant View full abstract»

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  • Frequency-domain identification algorithms for servo systems with friction

    Publication Year: 2002 , Page(s): 654 - 665
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB) |  | HTML iconHTML  

    Mechanical devices usually come with undesirable nonlinearities, such as friction, backlashes, and saturations. Under the assumption of linear systems, the commonly seen identification schemes utilize sinusoidal excitation signals for parameter identification. However, the data needed for identification are unavoidably distorted by the aforementioned nonlinearities and the identification result may not be satisfactory. In the paper, binary test signals are used to perform identification, thus simplifying the behavior of friction. An identification method based on the difference of binary multifrequency excitation signals is proposed. The modified identification algorithm does not suffer from the problem of nonlinear distortions in the signal shape and is able to determine the nonlinear friction such that an accurate servo system model can be derived. A high-precision ball-screw table with asymmetric friction is identified as a test plant for this approach. The results prove that the method can be used very successfully View full abstract»

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