Browsing by Subject "Mathematical Techniques"
Now showing items 1-10 of 10
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Conference Object
Inverse finite element method for directly formulated free and moving boundary problems
(Publ by Computational Mechanics Publ, 1991)In free boundary problems a priori unknown geometric parameters need to be evaluated simultaneously with the primary field unknowns. These problems are highly nonlinear and difficult to handle computationally. Here an ...
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Article
An inverse finite element method for directly formulated free boundary problems
(1989)In free boundary problems, in addition to the primary field variables, velocity, pressure and temperature, unknown geometric parameters need to be evaluated. A characteristic feature of the problems is a demarcation line ...
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Article
Modified methods of fundamental solutions for harmonic and biharmonic problems with boundary singularities
(1992)A modified version of the method of fundamental solutions which incorporates the singular behavior of the problem under consideration is introduced. The method is tested on potential and biharmonic problems and its performance ...
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Article
Necessary and sufficient conditions for strictly positive real matrices
(1990)In this paper we present some useful properties of strictly positive real transfer matrices for both continuous and discrete-time linear time-invariant systems in the frequency and state space domains. Some of these ...
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Article
An O(h6) cubic spline interpolating procedure for harmonic functions
(1991)An O(h6) method for the interpolation of harmonic functions in rectangular domains is described and analyzed, The method is based on an earlier cubic spline technique [N. Papamichael and J.R. Whiteman, BIT 14, 452–459 ...
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Article
On the coefficients of integrated expansions of ultraspherical polynomials
(1990)The problem of expressing the coefficients of an expansion of orthogonal polynomials that has been integrated an arbitrary number of times in terms of the coefficients of the original expansion is considered. A formula is ...
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Article
Persistency of excitation and overparametrization in model reference adaptive control
(1990)In an overparametrized model reference adaptive control system, the measured signal (t) cannot be persistently exciting (PE) for any bounded reference input r(t). The controller parameter vector for model-plant transfer ...
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Article
Robust adaptive control of bilinear plants
(1989)A robust model reference adaptive control scheme for bilinear plants with bounded disturbances is developed. Global stability of the closed-loop adaptive system is guaranteed by using a switching-a- modified adaptive law. ...
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Article
Robust adaptive control-a modified scheme
(1991)A normalizing signal that does not require the knowledge of the stability margin of the unmodelled dynamics is used in robust model reference adaptive control (MRAC) for plants with an enlarged class of unmodelled dynamics. ...
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Article
Unsteady flow of semi-concentrated suspensions using finite deformation tensors
(1994)The interest in the theoretical investigation of the flow behavior of fiber suspensions during manufacturing processes has increased considerably due to the increased interest in the use of composite materials. The unsteady ...