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Träfflista för sökning "WFRF:(Johansson Kenneth) ;pers:(Johansson Håkan 1979)"

Sökning: WFRF:(Johansson Kenneth) > Johansson Håkan 1979

  • Resultat 11-20 av 37
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11.
  • Johansson, Håkan, 1979, et al. (författare)
  • Calibration of a class of non-linear viscoelasticity models with sensitivity assessment based on duality
  • 2007
  • Ingår i: International Journal for Numerical Methods in Engineering. - : Wiley. - 0029-5981 .- 1097-0207. ; 69:12, s. 2513-2537
  • Tidskriftsartikel (refereegranskat)abstract
    • The calibration of constitutive models is based on the solution of an optimization problem, whereby the sought parameter values minimize an objective function that measures the discrepancy between experimental observations and the corresponding simulated response. By the introduction of an appropriate adjoint problem, the resulting formulation becomes well suited for a gradient-based optimization scheme. A class of viscoelastic models is studied, where a discontinuous Galerkin method is used to integrate the governing evolution equation in time. A practical solution algorithm, which utilizes the time-flow structure of the underlying evolution equation, is presented. Based on the proposed formulation it is convenient to estimate the sensitivity of the calibrated parameters with respect to measurement noise. The sensitivity is computed using a dual method, which compares favourably with the conventional primal method. The strategy is applied to a viscoelasticity model using experimental data from a uniaxial compression test. Copyright © 2006 John Wiley & Sons, Ltd.
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13.
  • Johansson, Håkan, 1979, et al. (författare)
  • Calibration of a Nonlinear Elastic Composite with Goal-Oriented Error Control Using a Sub-Scale Modeling Approach
  • 2004
  • Ingår i: Proc. of Second International Conference on Multiscale Materials Modeling, MMM-2, October 11-15, 2004. ; 1:1, s. 466-468
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • A recently proposed technique for the calibration of constitutive models is based on the optimization problem expressed such that the state equation is incorporated via an additional costate field. A distinct advantage is that error control is formally straightforward. This technique is applied to calibration of a nonlinear elastic composite using a meso-macro-transition approach, whereby the RVE is analyzed using (in this case) Dirichlet boundary conditions. The numerical results show the effectivity of the error prediction.
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14.
  • Johansson, Håkan, 1979, et al. (författare)
  • Calibration of a nonlinear viscoelasticity model with sensitivity assessment
  • 2005
  • Ingår i: Constitutive Models for Rubber IV, edited by P.-E. Austrell & L. Kari. - 0415383463 ; , s. 341-347
  • Konferensbidrag (refereegranskat)abstract
    • The calibration of constitutive models isbased on the solution of an optimization problem, where parameter values are sought such that optimal correspondence between measured and simulated response is achieved. The calibration problem is solved using a recently proposed strategy, which has the advantage that discretization errors induced in the simulated response, leading to errors in the optimal parameter values, isrelatively straightforward to estimate. Furthermore, it ispossible to estimate how sensitive the obtained solution is to uncertainties in the experimental data.
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16.
  • Johansson, Håkan, 1979, et al. (författare)
  • Calibration of the Bergström-Boyce model: Explicit expressions
  • 2005
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • In this report we derive the explicit expressions associated with the calibration of the Bergström-Boyce modelof nonlinear viscoelasticity. These expressions are intended for practical use in a computational algorithm.
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17.
  • Johansson, Håkan, 1979, et al. (författare)
  • Computational Constitutive Calibration for Groundwater Flow
  • 2003
  • Ingår i: ADMOS 2003, Adaptive modeling and simulation, September 29-October 1, 2003, Göteborg, Sweden, P.Díez and N.-E.Wiberg (eds). - 8495999307 ; , s. 157-158
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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18.
  • Johansson, Håkan, 1979, et al. (författare)
  • Error Computation for Parameter Identification Problems
  • 2006
  • Ingår i: GAMM (Gesellshaft für Angewandte Mathematik und Mechanik) Annual meering, Book of abstracts, March 27-31, 2006, Berlin, Germany. ; , s. 221-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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20.
  • Johansson, Håkan, 1979, et al. (författare)
  • Error-Controlled Identification of Viscoelastic Relaxation Spectra
  • 2007
  • Ingår i: Proceedings of the 20th Nordic Seminar on Computational Mechanics NSCM 20 R. Larsson and K. Runesson (eds.). - 1652-8549. - 9788496736313 ; , s. 2p abstract-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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  • Resultat 11-20 av 37

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