Měření, vyhodnocení a modelování mechanických vlastností polyuretanové pěny

Title Alternative:Measurement, evaluation and modelling of mechanical properties of polyurethane foam
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Polyurethane foam is a predominantly used material in car seat production. Comfort of passengers in a moving cars is not a part missed out in car design, therefore different types of PU foam are investigated. To compare mechanical properties of PU foams is necessary to have a standardized methodology of measurement, data processing and results evaluation. Such methodology is formulated at the first chapter of this work. It involves dynamical compression tests using harmonical and triangular exciting signal of deformation and relaxational tests. The influence of position from which the specimens of foam material are cut form PU seat semiproduct is evaluated and results deviation is commented regarding to precision of measurement and material modelling. For material modelling the fenomenological model with concentrated parameters is used. Influence of material density of PU foam to measured results is also investigated. Furthermore in this work the properties of slow spring back foam are measured and results commented in relation to ordinare foams. The methodology od modelling of damping force of PU foam using explicit formula is presented. It is exemplified on cases with variable parameters of kinematical excitation and on cases with variable material density. The same method is possible to use for damping force prediction as it is also shown.
polyurethane foam, driver’s seat, damping force, vibroinsulation, comfort of sitting, relaxation