Sökning: "updating parameter"

Visar resultat 1 - 5 av 18 avhandlingar innehållade orden updating parameter.

  1. 1. Systematic planning and execution of finite element model updating

    Författare :Joakim Wallin; Costin Pacoste; Raid Karoumi; Mario Plos; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dynamics; finite element model updating; bridge; objective function; updating parameter; mode pairing; dynamik; finita element modelluppdatering; bro; målfunktion; uppdateringsparameter; matchning av moder; Civil and Architectural Engineering; Byggvetenskap;

    Sammanfattning : In design of bridges and for estimation of dynamic properties and load carrying capacity Finite Element Method (FEM) is often used as a tool. The physical quantities used in the Finite Element (FE) model are often connected to varying degrees of uncertainty. LÄS MER

  2. 2. Test Design for Finite Element Model Updating - Identifiable Parameters and Informative Test Data

    Författare :Andreas Linderholt; Chalmers University of Technology; []
    Nyckelord :modal tests; test design; identifiability; Fisher information; optimization; data informativeness; model updating;

    Sammanfattning : It is important to predict structural phenomena, such as noise and fatigue, stemming from vibrations. To do this, reliable structural dynamic models are needed. To be useful the models have to compare well with reality in the validation against test data; if not, the models should be modified. LÄS MER

  3. 3. Test Design for Finite Element Model Updating : Identifiable Parameters and Informative Test Data

    Författare :Andreas Linderholt; Thomas Abrahamsson; Chalmers tekniska högskola; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Test Design Finite Element Model Updating Informativeness Identifiability optimization Fisher information modal tests; Maskinteknik; Mechanical Engineering;

    Sammanfattning : It is important to predict structural phenomena, such as noise and fatigue, stemming from vibra- tions. To do this, reliable structural dynamic models are needed. To be useful the models have to compare well with reality in the validation against test data; if not, the models should be mod- ified. LÄS MER

  4. 4. Stochastic model updating and model selection with application to structural dynamics

    Författare :Majid Khorsand Vakilzadeh; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite element model; Bayesian model selection; Bayesian model updating; stochastic simulation; Bootstrapping; Subspace system identification; Uncertainty quantification;

    Sammanfattning : Uncertainty induced by our incomplete state of knowledge about engineering systems and their surrounding environment give rise to challenging problems in the process of building predictive models for the system behavior. One such challenge is the model selection problem, which arises due to the existence of invariably multiple candidate models with different mathematical forms to represent the system behavior, and so there is a need to assess their plausibility based on experimental data. LÄS MER

  5. 5. Experimental Design and Updating of Finite Element Models

    Författare :Magnus Andersson; Lennart Ljung; Linköpings universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis deals with two partly related topics: model updating and actuator/sensor placement concerning finite element (FE) models of large, flexible mechanical structures.The importance of accurate dynamical FE models of mechanical structures in, e.g., aviation/aerospace applications are steadily increasing. LÄS MER