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

Date 2-5 Sept. 1996

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  • PIP optimal control with a risk sensitive criterion

    Publication Year: 1996, Page(s):959 - 964 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    The paper shows how the 'complete observations' formulation of linear exponential of quadratic Gaussian (LEQG) control theory can be applied within a nonminimal state space (NMSS) context. This complete observations solution is not restrictive within the NMSS formulation since all the NMSS states are readily available for measurement. As a result, the associated PIP-LEQG controller (proportional i... View full abstract»

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  • Process-optimizing multivariable control of a boiler system

    Publication Year: 1996, Page(s):787 - 792 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    This paper presents a method to apply multivariable controllers as optional process optimizing extensions to existing conventional control systems. The basic idea of the concept is to consider a conventionally controlled power plant boiler-85MW coal-fired drum boiler-as the process to be optimized. The control errors from the conventional controllers are used as inputs to a LQ controller. The outp... 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 (5)
    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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  • Application of an expert system for robust controller design

    Publication Year: 1996, Page(s):1004 - 1009 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    This paper describes an expert system and its application to robust control system design. The need for expert systems to aid practising control engineers to perform robust control systems design is discussed. A brief introduction of the H loop shaping design procedure is included. The role of expert systems in robust control systems design is discussed. We outline the structure ... View full abstract»

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  • Integral control with saturating input

    Publication Year: 1996, Page(s):805 - 808 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (252 KB)

    In this paper we consider the problem of integral low-gain control of stable finite-dimensional, single-input single-output systems with positive steady-state gain. The linear plant is subject to a sector-bounded actuator nonlinearity such as saturation or dead-zone. We show that provided the integral gain is small enough then the closed-loop system is globally stable, and arbitrary stepped refere... View full abstract»

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  • A novel self-learning fault detection system for gas turbine engines

    Publication Year: 1996, Page(s):867 - 872 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    Complex machinery such as aircraft gas turbine engines require complex control systems and control algorithms to allow them to operate efficiently and safely over a wide range of operating conditions. This increased complexity makes the task of finding faults extremely difficult. Thus, on occasions present fault detection systems indicate faults in components which cannot be found on later inspect... View full abstract»

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  • Robust disturbance rejection for left invertible systems with measurable and nonmeasurable disturbances

    Publication Year: 1996, Page(s):1010 - 1015 vol.2
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    The problem of robust disturbance rejection for left invertible linear systems, with nonlinear uncertain structure and with measurable and nonmeasurable disturbances, is studied and solved for the first time. The necessary and sufficient conditions for the problem to have a solution, via an independent of the uncertainties static feedback law, are established. The general explicit expression of th... View full abstract»

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  • Robustness analysis of a remotely piloted vehicle

    Publication Year: 1996, Page(s):776 - 781 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (464 KB)

    The stability robustness of the longitudinal dynamics of a closed-loop remotely piloted vehicle-the X7 half scale flying model of the ARMOR RPV-with uncertain parameters is considered. Techniques based on Lyapunov analysis and Gershgorin's theorem are used to predict a guaranteed parameter space for closed-loop stability. A large stochastic sampling is used to assess the conservatism of the result... 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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  • Symbolic CAD system for algebraic approach on MATLAB-Symbolic Control Toolbox

    Publication Year: 1996, Page(s):1338 - 1343 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    This paper has dealt with the prototype symbolic manipulation CAD system-Symbolic Control Toolbox-running on MATLAB. The functions are implemented in the conventional numerical CAD system. Compared with numerical CAD our system has the following advantages: there exists no roundoff or truncated error; the adopted algorithms are so systematic and well-defined that functions are implemented easily o... View full abstract»

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  • A simplified non-linear model of NOx emissions in a power station boiler

    Publication Year: 1996, Page(s):1016 - 1021 vol.2
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    When considering NOx development in power stations, experiments show that its formation is slower than the combustion process. Therefore in this paper the modelling of NOx emissions is decoupled from the combustion process. A NOx model for Kilroot Power Station in Northern Ireland is then derived from the extended Zeldovich mechanism. The physical parameters in the... View full abstract»

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  • The impact of industrial standards on product development

    Publication Year: 1996, Page(s):1394 - 1401 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (644 KB)

    This paper describes how the increasing emergence of industrial standards and their enforcement, in particular through European Directives, impacts product development. Although the move towards standardisation is in general very desirable, the increasing difficulties faced by the equipment manufacturers will undoubtedly influence such factors as product cost, the number of suppliers who can still... View full abstract»

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  • Spatial decomposition as a tool for the evaluation and design of cross-directional control systems in sheet metal rolling

    Publication Year: 1996, Page(s):1284 - 1289 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    Over supply in many segments of the metal strip manufacturing industry drives a need to achieve improved product quality and yield from existing mill stock. This demands improved process control, which is achieved though a range of commercially available actuators, most of which can be used on existing mills. However, these actuators are expensive and frequently their effect on product quality can... 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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  • Robust predictive control of systems with parametric uncertainties

    Publication Year: 1996, Page(s):1362 - 1367 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    This paper presents a regulation scheme capable of achieving the nominal tracking performance provided by the constrained receding horizon predictive control (CRHPC) together with quadratic stability in the face of parametric model uncertainties. A two-step procedure is followed. First, uncertainty is neglected and a CRHPC regulator is synthesised for the nominal plant. Then, a "robustifying" cont... View full abstract»

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  • Identification in the time and frequency domains: a comparison using the ECC bench-mark model

    Publication Year: 1996, Page(s):1290 - 1296 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (588 KB)

    A comparison is made between the time domain identification of z-domain models and frequency domain identification of s-domain models. Each approach has specific advantages, which depend on the intended application of the estimated model. The use of periodic excitation signals is also examined and their advantages discussed. The application of time and frequency domain techniques is illustrated us... View full abstract»

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  • Optimal quadratic filtering of quantization noise in non-Gaussian systems

    Publication Year: 1996, Page(s):1091 - 1096 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    This work deals with the problem of state estimation for a class of discrete time linear systems forced by non-Gaussian noise where the quantization on measured output is modeled, as usual, as additive noise having uniform probability distribution. The best linear estimate, computed through the Kalman filter, in this case may not give good results. To improve the covariance of the estimation error... View full abstract»

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  • Robustness of norm-optimal iterative learning control

    Publication Year: 1996, Page(s):1119 - 1124 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    The robustness of the "norm-optimal iterative learning control" algorithm previously proposed by the authors (1996) is studied. Several different kinds of perturbations are considered. The algorithm tends to be difficult to examine theoretically, but several robustness measures of differing conservativeness can be given. Numerical simulations are shown as well. 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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  • Joint control of a walking robot

    Publication Year: 1996, Page(s):884 - 888 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    A system capable of controlling the leg operation of a mobile walking robot travelling over variable terrain must be capable of adaptive reaction in negotiating unpredictable irregularities in the working floor surface. This paper proposes a motion planning control architecture for a pneumatically powered mobile robot based on the analysis of leg co-ordination and leg trajectory given a demanded b... 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 (2)
    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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  • New developments in batch process input profile optimisation

    Publication Year: 1996, Page(s):782 - 786 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    A novel algorithm for solving nonlinear discrete time optimal control problems with model-reality differences is presented. The technique uses dynamic integrated system optimisation and parameter estimation (DISOPE) which achieves the correct optimal solution in spite of deficiencies in the mathematical model employed in the optimisation procedure. A new method for approximating some Jacobian traj... View full abstract»

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  • Water resources sharing planning and management problems

    Publication Year: 1996, Page(s):1034 - 1039 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    The problem of water resources sharing is dealt with in this paper. In the solution of such a problem, water quality constraints have to be taken properly into account, as a considerable reduction of the flow in a river may seriously compromise the surviving of the river ecological system, especially in presence of polluting discharges of sewerage water. The water resources sharing problem may be ... View full abstract»

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  • ANN-based fault diagnosis method with a combined BP algorithm

    Publication Year: 1996, Page(s):861 - 866 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    This paper presents a knowledge acquisition approach for an ANN-based fault diagnosis expert system. A hierarchical classification diagnostic model is used in this system for the problems of complicated system. The model is implemented by a multiple structure neural network composed of some subnetworks. A improved backpropagation (BP) learning algorithm combined with conjugate gradient method and ... View full abstract»

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  • A new model structure selection method for non-linear systems in neural modelling

    Publication Year: 1996, Page(s):752 - 757 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    A new model structure selection method is proposed for neural network modelling of non-linear systems. When neural networks are employed to model a non-linear system for which no a priori knowledge is available, a problem which arises is how to determine the model structure in terms of the system order and the time delay. The model structure considered in this paper is the NARX model. The new meth... View full abstract»

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