DSpace Komunita:http://hdl.handle.net/11025/316532024-03-28T23:38:49Z2024-03-28T23:38:49ZOn the level of computational model of a human skull: a comparative studyChamrad, JakubMarcián, PetrBorák, Liborhttp://hdl.handle.net/11025/313412021-09-22T08:43:21Z2018-01-01T00:00:00ZNázev: On the level of computational model of a human skull: a comparative study
Autoři: Chamrad, Jakub; Marcián, Petr; Borák, Libor
Abstrakt: In this study, different patient-specific computational models of the skull, which are often used in literature, were
investigated, analysed and compared.The purpose of this studywas to demonstrate the differences in computational
model creation and results in case different computationalmodels based on same computed tomography (CT) dataset
are used. The selection of computationalmodel directly influences the values of investigated parameters. The effort
is to demonstrate, how the selection of the computational model influences the results of biomechanically relevant
parameters. The comparison was based on total displacement of the skull and von Mises strain investigated around
predefined paths around the skull. The strain values were evaluated according to criterion from literature. The
results were obtained using finite element method. The values of the displacement of the skull were higher in case
of considering cancellous bone tissue due to its poor material properties or heterogeneous material properties. The
same situation occurred during the evaluation of strain. The values were higher in models which include cancellous
bone tissue in the structure.2018-01-01T00:00:00ZChamrad, JakubMarcián, PetrBorák, LiborIdentification of several non-stationary loads applied to an elastically deformed structureLachmayer, RolandYanchevskyi, Igor V.Mozgova, IrynaGottwald, Philliphttp://hdl.handle.net/11025/313402021-09-22T08:43:20Z2018-01-01T00:00:00ZNázev: Identification of several non-stationary loads applied to an elastically deformed structure
Autoři: Lachmayer, Roland; Yanchevskyi, Igor V.; Mozgova, Iryna; Gottwald, Phillip
Abstrakt: The technique has been presented for time-dependence identification of several independent beetwen each other
loads distributed over a given area of a structure with arbitrary topology by using quantity values more convenient
for measurements. In the assumption that the structure’s response linearly depends on the loads, the considered
problem,which belongs to the class of boundary inverse problems in the mechanics of solids, is reduced to a system
of linear algebraic equations for coefficients that approximate the sought-for influences. The system is solved using
a regularizing algorithm providing stability of results to random errors in initial data and calculation errors.Concrete
calculations, substantiating the efficiency of the presented technique, have been performed as with theoretical data
to identify two non-stationary loads applied to a wheel carrier of a race car as with experimental data to restore an
impact force applied to a round plate with fixed boundary. To calculate values of a system’s elements corresponding
to values of measured quantities under unit loads, the finite elementmethod was used. The suggested technique can
be used for designing structures with complex geometry based on criterias of their dynamic (fatigue) strength, etc.2018-01-01T00:00:00ZLachmayer, RolandYanchevskyi, Igor V.Mozgova, IrynaGottwald, PhillipLateral force effects of three-axle locomotive bogie on trackMichálek, TomášHaupt, LukášZelenka, JaromírKohout, MartinLiberová, Stanislavahttp://hdl.handle.net/11025/313392021-09-22T08:43:20Z2018-01-01T00:00:00ZNázev: Lateral force effects of three-axle locomotive bogie on track
Autoři: Michálek, Tomáš; Haupt, Lukáš; Zelenka, Jaromír; Kohout, Martin; Liberová, Stanislava
Abstrakt: This paper deals with guiding behaviour of a diesel-electric locomotive equipped with new three-axle bogies
which were developed in co-operation of the company CZ LOKO and the Faculty of Transport Engineering of
the University of Pardubice. At first, the design of the new bogie intended for the track gauge 1520 mm is shortly
introduced. Then, the attention is paid to three different variants of secondary suspension design and their influence
on lateral force effects of the locomotive on track in curves. The assessment is performed by means of the multibody
simulation tool “SJKV” and it takes into account GOST standards. Possibilities of application of a system of
active elements for bogie steering are also evaluated.2018-01-01T00:00:00ZMichálek, TomášHaupt, LukášZelenka, JaromírKohout, MartinLiberová, StanislavaOn the application of Sturm's theorem to analysis of dynamic pull-in for a graphene-based MEMS modelOmarov, DaniyarNurakhmetov, DauletWei, DongmingSkrzypacz, Piotrhttp://hdl.handle.net/11025/313382021-09-22T08:43:20Z2018-01-01T00:00:00ZNázev: On the application of Sturm's theorem to analysis of dynamic pull-in for a graphene-based MEMS model
Autoři: Omarov, Daniyar; Nurakhmetov, Daulet; Wei, Dongming; Skrzypacz, Piotr
Abstrakt: A novel procedure based on the Sturm’s theorem for real-valued polynomials is developed to predict and identify
periodic and non-periodic solutions for a graphene-based MEMS lumped parameter model with general initial
conditions. It is demonstrated that under specific conditions on the lumped parameters and the initial conditions,
the model has certain periodic solutions and otherwise there are no such solutions. This theoretical procedure is
made practical by numerical implementationswith Python scripts to verify the predicted behaviour of the solutions.
Numerical simulations are performed with sample data to justify by this procedure the analytically predicted
existence of periodic solutions.2018-01-01T00:00:00ZOmarov, DaniyarNurakhmetov, DauletWei, DongmingSkrzypacz, Piotr