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dc.contributor.authorPíštěk, Václavcs
dc.contributor.authorKlimeš, Lubomírcs
dc.contributor.authorMauder, Tomášcs
dc.contributor.authorKučera, Pavelcs
dc.identifier.citationJournal of Vibroengineering. 2017, vol. 19, issue 6, p. 4459-4470.en
dc.description.abstractDynamic torsional vibration dampers are for a long time inherent integral components of internal combustion engines. One of the most common types of the dynamic dampers is a silicone damper. It has been, for many years, perceived as an exclusively viscous damper, thus it has been constructed and designed according to this perception. When compared to other types of dynamic dampers of the similar size with flexible components used for their construction, the standard iscous damper has a lower damping effect. Moreover, this damper type has been a significantly cheaper and simpler solution. Current silicone oils with high nominal viscosity, having not only the expected damping properties, but also significant elastic characteristics under alternate shear stress, enable construction of dynamic dampers with a higher damping effect than a viscous damper. Frequency and temperature dependent complicated rheological properties of high viscosity silicone fluids can only be identified experimentally using a suitable dynamic viscometer. However, the measured frequency dependencies of both components of the complex shear modulus are only defined for harmonic loading while internal combustion engine load is periodic and contains several tens harmonics. The key to the solution is therefore to find suitable multiparameter rheological models comprised of linear elastic and damping elements that would approximate in the specified frequency range both components of the complex shear modulus. Such a complicated task can be solved using efficient optimization algorithms. This article focuses on the mathematical description of convolute rheological properties of high viscosity silicone liquids and also contains an example of the application of created rheological models in the complex dynamic model of a V10 diesel engine. A computational tool for the determination of stiffness and damping coefficients of the multi-parameter rheological model was created and solved in the optimization software GAMS by means of the CONOPT solver. The possibility of these modern technologies is shown by the comparison of computation models and experimentally set torsional vibration spectres with standard viscous damper and damper utilizing a high viscosity silicone oil.en
dc.publisherJVE Internationalcs
dc.relation.ispartofJournal of Vibroengineeringcs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.subjectrheological modelen
dc.subjectsilicone fluiden
dc.subjectviscous damperen
dc.subjectnonlinear optimizationen
dc.subjectoptimal rheological structureen
dc.titleOptimal design of structure in rheological models: an automotive application to dampers with high viscosity silicone fluidsen
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav automobilního a dopravního inženýrstvícs
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. EÚ-odbor termomechaniky a techniky prostředícs
sync.item.insts2020.08.04 13:02:41en
sync.item.modts2020.08.04 12:35:20en

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Creative Commons Attribution 4.0 International
Except where otherwise noted, this item's license is described as Creative Commons Attribution 4.0 International