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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Dynamics and control 8 (1998), S. 303-339 
    ISSN: 1573-8450
    Keywords: H-infinity design ; Multivariable Control ; Predictive Control ; Prediction ; LGQ Design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract An H∞ generalized control law is derived which has properties in common with both the GH∞ and GPC control laws. The stability and robustness properties are the same as for a GH∞ optimal controller but a cost on future predictive error and control action is dealt with in the same manner as for the GPC or model based predictive control laws. This type of long range predictive control algorithm has stability and robustness problems which are much improved through the H∞ formalism. The general two-block problem solution is considered first and this is then reduced to a novel one-block multi-step GH∞ control law which is very attractive computationally. This latter algorithm has all the benefits of one-block H∞ controllers and yet the equations can be written in a form where GPC type constrained solutions can be obtained.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Dynamics and control 6 (1996), S. 143-161 
    ISSN: 1573-8450
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A comparison between classical, LQG andH ∞ design procedures is presented for the design of the power regulator in a fixed speed horizontal axis wind turbine. The relative merits of the different approaches are discussed regarding both the procedures and the resulting controllers.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 26 (1978), S. 427-451 
    ISSN: 1573-2878
    Keywords: Conjugate-gradient methods ; descent methods ; functional analysis ; modeling ; nonlinear functional equations ; roll gap relationships ; cold mill
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In the development of a roll force model for cold rolling, techniques were developed for solving the system equations which are of general interest. This paper gives a brief introduction to the physical model but concentrates on the solution of the model equations and the simulation. An unusual feature of the model was that the calculated profiles had to satisfy a number of boundary conditions at different points throughout the roll arc. A new method was developed for calculating these profiles and for determining the gradient functions which satisfied the boundary constraints.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 12 (1978), S. 643-663 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A long established approximation, normally invoked in the development of classical rolling theory, is that the work roll-strip interface assumes a circular profile. Although valid for a wide range of practical rolling conditions, the approximation is definitely suspect for instance in the last and penultimate stand of a thin sheet tandem mill, and algorithms based on classical theory may fail to converge. This paper computing solutions. In deriving the algorithm it is convenient to employ the formalism of functional One notable feature is that the gradients have to be carefully defined with respect to the correct ‘space’, in order that physically inadmissible discontinuties are not introduced during the hill-climbing. Computed roll gap solutions sometimes display elastic deformation regions embedded within the normal plastic deformation zone. It is thought that this is the first time this possibility has been allowed for in the formulation, or solutions obtained exhibiting this feature.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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