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Control '96, UKACC International Conference on (Conf. Publ. No. 427)

2-5 Sept. 1996

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Displaying Results 1 - 25 of 132
  • μ optimal control of a laboratory plant

    Publication Year: 1996, Page(s):953 - 958 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    The paper presents the design of a robust control for a real plant at laboratory scale. The process considered consists of the production of a C1H dissolution. The control system aim is to maintain the concentration at prescribed values despite variations in the plant, the presence of disturbances and the inherent nonlinearity of the process. The uncertainties in the model are studied and characte... View full abstract»

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  • Minimum-time problem for linear second-order conflict-controlled systems

    Publication Year: 1996, Page(s):947 - 952 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    The time optimal problem for linear differential games in the plane is considered. The algorithm for constructing the level sets of the value function is proposed. Numerical examples are presented. View full abstract»

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  • An approach for path following optimal control of multibody systems

    Publication Year: 1996, Page(s):941 - 946 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    An approach to the determination of approximate solutions of path following optimal control problems by exploiting modern global search and optimization techniques is proposed. According to the methodology developed in this paper, controls are represented by discrete vectors and substituted in the system equations. Alternatively, when it is possible to exclude the controls from the system equation... View full abstract»

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  • System identification via genetic programming

    Publication Year: 1996, Page(s):912 - 917 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (608 KB)

    Compared to bit string coded GAs, GP is a more powerful system identification tool. However, there is no guarantee that GP will produce an exact solution. Perhaps that is the price associated with the increased flexibility of the paradigm. Bancroft (1995) reported that, failures to discover the correct model structure of time series were attributed to high levels of coloured noise and the presence... View full abstract»

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  • Design of robust controllers for a milk of lime blending tank

    Publication Year: 1996, Page(s):799 - 804 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    This paper presents the use of an industrial milk of lime blending tank (MLBT) for the design and evaluation of different robust controllers. The plant is a multi-input, multi-output non-linear system with high interaction between loops and large disturbance actions. The IMC, H∞ and μ methods are used to design controllers which provide robust stability as well as good nominal ... View full abstract»

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  • Optimal linear control for a class of nonlinear systems

    Publication Year: 1996, Page(s):936 - 940 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    A new optimal nonlinear feedback control law is presented, which is based on the differential geometric approach and linear control theory. By means of this control law and nonlinear change of coordinates, a class of nonlinear control systems can be reformed to a linear optimal and decoupling system. An angle control system of a mechanical arm driven by DC motor and another example are introduced.... View full abstract»

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  • Implementation of neural network approach in MIMO electrohydraulic servosystem control

    Publication Year: 1996, Page(s):1468 - 1473 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    The objective of this study is to implement a practical neural controller for a MIMO nonlinear hydraulic control system. A model reference approach is used in which the controller forces the hydraulic system to follow predetermined reference outputs. Experiments were conducted to illustrate the feasibility and benefits of the neural network approach in comparison with the traditional PID control s... View full abstract»

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  • A practical approach to selecting weighting functions for H control and its application to a pilot plant

    Publication Year: 1996, Page(s):998 - 1003 vol.2
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    Methods of commissioning weighting functions to reflect system specifications in H∞ design are investigated. For constrained control effort, such as position and rate limits of an actuator, an explicit weighting function expression is derived. A basic form for the performance weighting function is suggested, whose physical connections with system steady-state performance and trans... View full abstract»

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  • Real-time fault diagnosis for transmission systems

    Publication Year: 1996, Page(s):1413 - 1417 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    This paper has described the development and testing of a real-time alarm handling and fault analysis expert system, which reduces the volume of data presented to a control engineer working on an energy and management system by diagnosing and summarising faults. From the user's point of view, AHFA made a good start and proved to be extensible to cope with more complex types of fault. AHFA is curre... View full abstract»

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  • Modelling and control of electropneumatic systems: an overview of recent French contributions

    Publication Year: 1996, Page(s):1462 - 1467 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (528 KB)

    This paper describes different simulation and control models for electropneumatic systems and presents the different control laws developed by the Laboratoire d'Automatique Industrielle de l'INSA de Lyon. View full abstract»

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  • Analysis of relationship between chaotic dynamics and stochastic processes

    Publication Year: 1996, Page(s):1232 - 1237 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    This paper presents an equivalence relation between chaotic and stochastic systems based on a combinatorial study of chaotic dynamics and stochastic processes. The study focuses on the dynamic density of chaotic systems and Brownian motion in stochastic systems. The equivalency in invariant measure and ergodicity between the two systems is defined. Based on the definition, the equivalence relation... View full abstract»

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  • A robust nonlinear control design for remotely operated vehicle depth control systems

    Publication Year: 1996, Page(s):993 - 997 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    In this paper, an input-output linearization controller with an adaptive fuzzy outer loop is applied to the depth control of a nonlinear remotely operated vehicle (ROV). The adaptive fuzzy system is added to increase the robustness as well as add "intelligence" to conventional input-output controllers. The free control parameters are selected using multi-objective fuzzy genetic algorithm optimizat... View full abstract»

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  • Control system parameter identification using the population based incremental learning (PBIL)

    Publication Year: 1996, Page(s):1309 - 1314 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    In this paper a technique of how a stochastic search and optimisation technique dubbed the population based incremental learning can be used for parameter identification of continuous control system models, is presented. This method is an abstraction of a simple genetic algorithm (GA) which maintains all the statistical properties of a GA but removes the genetic recombination operators. The method... View full abstract»

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  • Adaptive detection of generator out-of-step conditions in power systems using an artificial neural network

    Publication Year: 1996, Page(s):1407 - 1412 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    The application of artificial neural networks (ANN) to power systems has resulted in an overall improvement of solutions in many implementations. This paper presents a new approach for adaptive out-of-step detection of synchronous generators based on neural networks. The paper describes the ANN architecture adopted as well as the selection of the input features for training the ANN. A feedforward ... View full abstract»

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  • Path-following and point-stabilization control laws for a wheeled mobile robot

    Publication Year: 1996, Page(s):878 - 883 vol.2
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    Two main problems, concerning wheeled mobile robots, have attracted extensively the attention of many authors in the literature: the path following and the stabilization problems. In this paper, we present a nonlinear pure-state feedback based on partial state feedback linearization and Lyapunov method for the path following problem, and a discontinuous time-varying state feedback for the stabiliz... View full abstract»

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  • 4-dimensional control of a remotely piloted vehicle

    Publication Year: 1996, Page(s):770 - 775 vol.2
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    The problem of accurate tracking to a non-zero reference input is addressed in the context of multivariable flight control. There exists a requirement of zero steady state error in order to perform specific autopilot commands such as accurate 4-dimensional control: thus enabling the aircraft to be accurately positioned in time and space. The novel algorithm of optimal dyadic pole placement (ODP) i... View full abstract»

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  • Effect of RHP zeros and poles on performance in multivariable systems

    Publication Year: 1996, Page(s):930 - 935 vol.2
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    This paper examines the implications of RHP-zeros and poles on performance of multivariable feedback systems. The results quantify the fundamental limitations imposed by RHP-zeros and poles in terms of lower bounds on the peak of the weighted sensitivity and complementary sensitivity functions. View full abstract»

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  • The design of pressure compensators for load sensing hydraulic systems

    Publication Year: 1996, Page(s):1456 - 1461 vol.2
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    A clear trend in mobile fluid power systems is to introduce more efficient system concepts, both in terms of energy efficiency and in terms of dynamic behaviour. Load sensing systems offers a very energy efficient solution, but it will also cause interference between the different loads in the system. One way to overcome this problem, is to use pressure compensated valves. The dynamic properties m... View full abstract»

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  • Changing the unstable zero dynamics of nonlinear systems via parallel compensation

    Publication Year: 1996, Page(s):1226 - 1231 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    This paper deals with the unstable zero dynamics of nonlinear systems. It is well understood, that for many control schemes like adaptive control, model matching, exact linearisation and much more there exist a necessary assumption: the controlled system has to be minimum phase, i.e. the zero dynamics must be stable. This paper shows that for analytic systems with linear inputs (ALS) a linear para... View full abstract»

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  • Reachability and controllability of 2-D Roesser model with bounded inputs

    Publication Year: 1996, Page(s):971 - 974 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    The most popular models of two dimensional (2D) linear systems are the discrete models proposed by R.P. Roesser (1975), E. Fornasini and G. Marchesini (1976; 1978) and J. Kurek (1985). It is well known (R.R. Mohler, 1991) that the linear continuous time system x˙=Ax+Bu with u bounded is not completely controllable if the eigenvalues of the system matrix A have negative real parts. Similarly, t... View full abstract»

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  • N-D nonuniform sampling approach to neurocontrol: a guided tour

    Publication Year: 1996, Page(s):987 - 992 vol.2
    Cited by:  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    This paper presents an overview of an approach to deterministic, discrete-time neurocontrol of nonlinear (NARMA) dynamic systems, given input-output data of finite length. We explain a novel modelling technique based on nonuniform multi-dimensional (N-D) sampling and Fourier analysis. Important issues of adaptation and persistency of excitation (PE) are addressed. In order to deal with the modelli... View full abstract»

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  • Standards-a user's perspective

    Publication Year: 1996, Page(s):1402 - 1406 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    There are currently major changes underway within the process industries on how standards are viewed. There is a trend away from in-house company standards towards industry-wide standards. At the same time the standards themselves are taking a "prescriptive" rather than "descriptive" approach. Within Europe standards are being used to enforce legislation aimed at opening the market. This paper loo... View full abstract»

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  • On the application of a fast identification algorithm to fault detection and diagnosis in car engines

    Publication Year: 1996, Page(s):873 - 877 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    This paper presents the results of an investigation into the applicability of a fast identification algorithm for fault detection and diagnosis in a multicylinder car engine. A nonlinear ARMA model is established, where the coefficients of the model are nonlinear functions of the shaft angle. This approach is compared with a previously proposed parameter estimation based approach. It is shown thro... View full abstract»

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  • List of Authors

    Publication Year: 1996, Page(s):xxxiv - xxxix
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    First Page of the Article
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  • Predication by extrapolation: an application of computer algebra in control

    Publication Year: 1996, Page(s):1344 - 1349 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (556 KB)

    Concerns the identification of the analytic controllability properties of a multilink inverted pendulum. This can be done using low-order versions of the system (that is, those with few links). By extrapolating such results it is then possible to make some meaningful assertions on controllability for the more general case, and whilst the analysis is not fully symbolic in all parameters, it is pres... View full abstract»

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