Sökning: "viscoelastic measurements"

Visar resultat 1 - 5 av 39 avhandlingar innehållade orden viscoelastic measurements.

  1. 1. Identification of viscoelastic materials and continuous-time stochastic systems

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Magnus Mossberg; Karlstads universitet.; Uppsala universitet.; Uppsala universitet.; [2000]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; Electrical Engineering; TECHNOLOGY Information technology Signal processing; TEKNIKVETENSKAP Informationsteknik Signalbehandling; Signal Processing; Signalbehandling; identification; viscoelastic; continuous-time;

    Sammanfattning : Two system identification problems, identification of viscoelastic material properties and identification of continuous-time stochastic systems, are considered in the thesis.The viscoelastic material properties are characterised by the frequency-dependent complex modulus. LÄS MER

  2. 2. Estimation of state and identification of complex modulus based on measurements om a bar traversed by waves

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Lars Hillström; Uppsala universitet.; [2001]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Wave; extensional; flexural; bar; rod; beam; elastic; viscoelastic; complex modulus; non-parametric; parametric; standard deviation; Materialvetenskap; TECHNOLOGY Materials science; TEKNIKVETENSKAP Teknisk materialvetenskap; Solid Mechanics; hållfasthetslära;

    Sammanfattning : Estimation of state and identification of complex modulus based on measurements on non-uniform rods and beams have been studied theoretically and experimentally. Two principal cases were studied. In the first case, the material properties are fully known and the state at a section is to be estimated. LÄS MER

  3. 3. Mechanistic-Empirical Modelling of Flexible Pavement Performance Verifications Using APT Measurements

    Detta är en avhandling från Stockholm : US-AB

    Författare :Abubeker Worake Ahmed; KTH.; Statens väg- och transportforskningsinstitut.; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Transportvetenskap; Transport Science; Civil and Architectural Engineering; Byggvetenskap; Flexible Pavement; Pavement Performance Models; Multilayer Elastic Theory; Linear Viscoelasticity; Rutting; Accelerated Pavement Testing; Heavy Vehicle Simulator; Road: Pavement design; Road: Pavement design; Performance; Deformation; Model not math ; Rutting wheel ; Viscoelasticity; Elasticity; Axle load; Flexible pavement; Laboratory not an organization ; Test; Thesis; Heavy vehicle simulator; Wheel tracking test;

    Sammanfattning : Mechanistic-Empirical  (M-E)  pavement  design  procedures  are  composed  of  a  reliable  response model to estimate the state of stress in the pavement and distress models in order to predict the different types of pavement distresses due to the prevailing traffic and environmental conditions. One of the main objectives of this study was to develop a response model based on multilayer elastic  theory   (MLET)  with  improved  computational  performance  by   optimizing  the   time consuming parts of the MLET processes. LÄS MER

  4. 4. Determination of viscoelastic material properties and impact force from measurements on impacted bodies

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Sven Ödeen; [1993]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : Methods are presented for identification of linear and nonlinear viscoelastic materials and for prediction of impact force on the basis of measurements made on impacted bodies. The complex modulus is identified from measured end-point accelerations of an impacted rod specimen, and in-situ from measured strains at three sections of a rod-like member of an impacted structure. LÄS MER

  5. 5. Mircostructure and rheological properties of concentrated tomato suspensions during processing

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Elena Bayod; Lunds universitet.; Lund University.; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rheology; microstructure; morphology; flocs; tomato paste; ketchup; fibre suspensions; viscoelastic properties; particle size distribution; time dependency; network; yield stress; wall slip; Mooney; Cox-Merz rule; Tikhonov; tube viscometer; rotational viscometer; homogenisation; shearing;

    Sammanfattning : Food processing comprises operations such as dilution (changing the concentration), homogenisation (changing the particle size), and subsequent pumping (shearing), among others. It is thus of great interest to gain a better understanding of the mechanisms governing the creation and disruption of structures during these engineering operations, and the way in which they are related to the textural and rheological properties of the material. LÄS MER