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Control Systems Technology, IEEE Transactions on

Issue 1 • Date Jan. 1999

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Displaying Results 1 - 14 of 14
  • Comments on "On induction motors control"

    Publication Year: 1999
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (24 KB)  

    In the above paper (Rachid, 1997), the author claims that by using the square of the flux magnitude, he is able to develop a nonsingular controller which requires less computation than the standard field-oriented controller. The purpose of this paper is point out that these claims are incorrect. View full abstract»

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  • Coating deviation control in transverse direction for a continuous galvanizing line

    Publication Year: 1999 , Page(s): 129 - 135
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (208 KB)  

    A new air knife system for control of coating thickness was developed for a hot dip galvanizing line. The existing air knife system can manipulate only the mean coating weight. The developed new air knife system has the flexible nozzle structure, by which the transverse coating weight can be controlled. The controller is a multiinput-multioutput (MIMO) system which consists of m control inputs (measured value) and n control outputs (nozzle control). Multinozzle control is based on the optimal control algorithm. The controller calculates the m nozzle references according to the n coating weight deviations using optimal algorithm and the models between the coating weight and nozzle gap. The time delay problem was solved by the Smith predictor View full abstract»

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  • Two-degree-of-freedom controller design for an ill-conditioned distillation process using μ-synthesis

    Publication Year: 1999 , Page(s): 12 - 21
    Cited by:  Papers (10)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    The structured singular value framework is applied to a distillation benchmark problem formulated for the 1991 IEEE Conference on decision and control (CDC). A two degree of freedom controller, which satisfies all control objectives of the CDC problem, is designed using μ-synthesis. The design methodology is presented and special attention is paid to the approximation of given control objectives into frequency domain weights View full abstract»

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  • Robust automatic steering control for look-down reference systems with front and rear sensors

    Publication Year: 1999 , Page(s): 2 - 11
    Cited by:  Papers (45)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    This paper describes a robust control design for automatic steering of passenger cars. Previous studies showed that reliable automatic driving at highway speed may not be achieved under practical conditions with look-down reference systems which use only one sensor at the front bumper to measure the lateral displacement of the vehicle from the lane reference. An additional lateral displacement sensor is added here at the tail bumper to solve the automatic steering control problem. The control design is performed stepwise: an initial controller is determined using the parameter space approach in an invariance plane; and this controller is then refined to accommodate practical constraints and finally optimized using the multiobjective optimization program. The performance and robustness of the final controller was verified experimentally at California PATH in a series of test runs View full abstract»

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  • Torque control for a form tool drilling operation

    Publication Year: 1999 , Page(s): 22 - 30
    Cited by:  Papers (18)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB)  

    This paper presents the dynamic modeling and real-time torque control for a form tool drilling process. The form tool produces a desired shape in a workpiece through a drilling process. In this study, the form tool drilling process resembles the combination of drilling, reaming, counter-boring, and chamfering operations. The machining process is modeled as a linear system with variable gain due to the form tool geometry. The process is also subject to unknown disturbances such as unpredictable chip jamming and tool-workpiece friction. Spindle motor power and speed measurements were used to estimate drilling torque for cost effective practical implementation. An input-output pole placement controller with previewed gain scheduling was designed and implemented. Through experimental studies, this controller was shown to effectively regulate tool torque and hence avoid tool breakage, by manipulating the feed during drilling, and reduce cycle time compared to current practice View full abstract»

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  • Nonlinear control of a heating, ventilating, and air conditioning system with thermal load estimation

    Publication Year: 1999 , Page(s): 56 - 63
    Cited by:  Papers (34)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (240 KB)  

    This paper presents a nonlinear controller for a heating, ventilating, and air conditioning (HVAC) system capable of maintaining comfort conditions under time varying thermal loads. The controller consist of a regulator and a disturbance rejection component designed using Lyapunov stability theory. The mitigation of the effect of thermal loads other than design loads on the system is due to an online thermal load and state estimator. The availability of the thermal load estimates allows the controller to keep comfort regardless of the thermal loads affecting the thermal space being heated or cooled. Simulation results are used to demonstrate the potential for keeping comfort and saving energy of this methodology on a variable-air-volume HVAC system operating on cooling mode View full abstract»

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  • Model-based adaptive hybrid control for manipulators under multiple geometric constraints

    Publication Year: 1999 , Page(s): 97 - 109
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (692 KB)  

    This paper proposes an adaptive hybrid controller for manipulators constrained on multiple smooth geometric surfaces and reports the experimental results on a six-degree-of-freedom direct-drive manipulator. This controller produces simultaneous position and force tracking of the constrained manipulators even when their physical parameters are unknown since it is incorporated with the model-based adaptive algorithm. The asymptotic stability is guaranteed by a passivity-based Lyapunov function. Further, we present a parallel implementation of this controller using transputers on the six-DOF manipulator. We examine the control performance by experiments of the manipulator in a point-point contact, two point-point contacts, and a face-face contact with the environment, respectively View full abstract»

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  • Modeling, plant uncertainties, and fuzzy logic sliding control of gaseous systems

    Publication Year: 1999 , Page(s): 42 - 55
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (420 KB)  

    The active control problem of gaseous processes such as primary air atmospheric-suction and forced-draft supply of air for fuel combustion is addressed in this article. The objective is to regulate gas velocity, at particular locations within the system, so that appropriate volume flow rate is achieved. Using modal expansion and treating the high-order modes as unmodeled dynamics, the governing law of momentum conservation reduces to a finite set of ordinary differential equations. Due to variations of the gas properties with operating conditions, there exists parametric uncertainty in the obtained reduced-order model. Moreover, inclusion of the fan characteristic and actuator dynamics introduces additional uncertainty and nonlinearity in the model. To avoid relying on estimation of parameters that vary with operating conditions or on conservative bounds on the uncertainty, the proposed controller has variable structure with adaptive switched gain. A fuzzy-logic-based inference engine realizes the adaptive law that tunes the switched gain to the smallest value that verifies the sliding condition. In effect, this novel design reduces the tendency and magnitude of chattering, a drawback of conventional sliding control. The fuzzy logic sliding controller is tested on a prototype air-handling unit. Compared with PI control, a standard for such applications, the advocated controller overshoots less to square-wave and tracks accurately, in the steady-state higher order inputs. Further experimental investigation demonstrates robustness to structured and unstructured uncertainty View full abstract»

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  • H2/H active control of sound in a headrest: design and implementation

    Publication Year: 1999 , Page(s): 79 - 84
    Cited by:  Papers (25)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    This paper presents an H2/H feedback controller design for active sound control in a headrest. The design method which employ an H2 performance criterion, with H2 and H constraints, was formulated as a convex programming problem using FIR Q-parameterization and frequency discretization, and solved using sequential quadratic programming. The design method was found effective since various objectives and constraints which are useful for this active sound control application were readily included. A robust controller was then designed for an experimental headrest system, and the performance, robust stability, and the multiplicative plant uncertainty model used in the design are presented and analyzed. A reduced-order real-time controller was then implemented on a digital signal processing system, producing the performance predicted in the design View full abstract»

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  • Event-based modeling and control for the burnthrough point in sintering processes

    Publication Year: 1999 , Page(s): 31 - 41
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    This paper treats modeling and control for the burnthrough point in industrial sintering processes. First, a simple state-space model for event-time dynamics is derived for a complicated system by introducing events into a continuous variable system. For the control of the sintering process, a two-stage control policy is used. First, optimal interevent time is obtained from an output-constrained receding horizon control with a least-square prediction algorithm. Then the average strand speeds for the interevent times are obtained and applied as a command signal to a motor control system. It is proved that the proposed output-constrained receding horizon control law with a short horizon stabilizes the closed-loop system and the steady-state error for a set-point becomes zero. The real-time experiments are carried out in a POSCO (Pohang Steel Company, Korea) sintering plant and satisfactory results are presented in this paper. Also, computer simulations are carried out and compared with the real-time experiments View full abstract»

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  • A technique for frequency response identification from relay feedback

    Publication Year: 1999 , Page(s): 122 - 128
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (188 KB)  

    In this paper, a new method for process frequency response identification is proposed, which can identify multiple points on a process frequency response from a single relay feedback test. The process output and input responses to the test are decomposed into the transient parts and the stationary cycle parts. These parts are then transformed to their frequency responses using the DFT and digital integration, respectively, to obtain the process frequency response. Real-time tests of the method on various processes give quite accurate process frequency responses, especially in the important frequency range from zero to the critical frequency. The testing conditions for our identification are the same as those for the step testing. The multiple points on process frequency response identified are very useful for process modeling and controller tuning. A real-time PID controller auto-tuning experiment which employs the proposed identification method is presented to demonstrate the applicability of our method View full abstract»

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  • Parametric uncertainty model for control design and analysis

    Publication Year: 1999 , Page(s): 85 - 96
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB)  

    An approach is presented that develops an accurate model of parametric uncertainty suitable for structural control design and analysis. This approach requires a number of different data sets to capture the dynamics of the system and its variability. Using an identification technique, the modal parameters of the finite element model are estimated. The parameter estimates are combined into a parametric uncertainty model in the form of mean errors and bounds on the modal parameters, which can then be used for robust control design and analysis. The development and utilization of this uncertainty model is demonstrated using the middeck active control experiment, a shuttle middeck experiment that flew on STS-67 in March 1995 View full abstract»

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  • Modeling and compensation of low-velocity friction with bounds

    Publication Year: 1999 , Page(s): 110 - 121
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (364 KB)  

    A systematic model-free methodology for the identification and compensation of friction is proposed and is shown to be viable for a class of dynamic systems. Design of the proposed identifier for friction uses Gaussian networks and incorporates explicit performance bound information. The identifier is then used in a particular compensation strategy that provides error bound information. The proposed identification and control designs have been validated using a hardware example case system. The methodology for identifying friction is systematic and uses minimal knowledge of the dynamics which is particularly attractive for a large class of low-dimensional dynamic systems with friction View full abstract»

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  • Contribution to the integrated control synthesis of road vehicles

    Publication Year: 1999 , Page(s): 64 - 78
    Cited by:  Papers (15)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    A nonlinear vehicle model with 22 motion degrees of freedom, used for synthesis of the system autopilot, was described in the paper. It was demonstrated how a controller can be designed on the basis of such relatively complex dynamic model, ensuring simultaneous motion stability of the vehicle in longitudinal, lateral and vertical directions, as well as the stability of roll, pitch, and yaw dynamics of the vehicle about corresponding axes. Vehicle automatic control was realized at two hierarchical levels: tactical and executional. Proposed scheme of the distributed hierarchy control enables control of entire vehicle dynamics as a multibody dynamic system. Control has been synthesized in such a way that the system satisfies set criteria of dynamic behavior. The synthesized controller improves system motion caused by action of casual, external perturbations, and internal inertial and centrifugal forces which appear as a consequence of an inadequately adapted ride velocity to the road geometry. Also, necessary information for estimation of unknown time-variant parameters of the dynamic model and of tire-road interaction were briefly given in the paper. Simulation results were presented and analyzed for one example of characteristic trajectory with perturbation of type of an uneven and slippery road, as well as a wind gust View full abstract»

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