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Your search keyword '"Juračka, David"' showing total 2 results
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2 results on '"Juračka, David"'

1. Numerical simulation of the behavior of ball absorber in the spherical dish.

Author

Kawulok, Marek, Freiherrová, Nela, Juračka, David, and Pospíšil, Stanislav

Subjects
COMPUTER simulation, NONLINEAR differential equations, NONLINEAR equations, SIMULATION methods & models
Abstract

This paper is aimed at performing numerical simulations of the behavior of a planar model system consisting of a spherical absorber located in a supporting convex spherical cap. The derived system of nonlinear differential equations is subjected to a numerical solution. First, the time response of the system to harmonic excitation is analyzed. For this excitation, the frequency of the excitation was gradually changed, thus, resonance curves were created. This paper also examines the effect of initial conditions. For this purpose, numerical simulations of the system without an external excitation source have been performed. The results are phase portraits for selected pairs of initial conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Mechanical Properties of Wooden Elements with 3D Printed Reinforcement from Polymers and Carbon.

Author

Dedek, Jan, Juračka, David, Bujdoš, David, and Lehner, Petr

Subjects
*POLYMERS, *WOOD, *CARBON fibers, *POLYCARBONATES, *BEND testing
Abstract

The research presented in this article aimed to investigate the differences in mechanical properties between solid structural timber and the same reinforced element in three different ways. A three-point bending test was performed on wood elements reinforced with carbon-fiber-reinforced polymer (CFRP), 3D printed polycarbonate (3DPC) lamellas, and 3D printed polycarbonate with carbon fiber (3DPCCF) lamellas. In this comparison, the bending strength was large for CFRP samples, which have 8% higher performance than samples with 3DPCCF and 19% higher performance than samples with 3DPC. Conversely, when factoring in theoretical manufacturing costs, the performance of 3DPCCF is almost three times that of CFRP and 3DPC. In addition, 3D materials can be used for more complicated reinforcement shapes than those discussed in the paper. [ABSTRACT FROM AUTHOR]

Published
2024
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