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2,415 results on '"Awrejcewicz, Jan"'

226. Development of an Electronic Stethoscope

Author

Szymanowska, Olga, Zagrodny, Bartłomiej, Ludwicki, Michał, Awrejcewicz, Jan, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, Awrejcewicz, Jan, editor, Kaliński, Krzysztof J., editor, Szewczyk, Roman, editor, and Kaliczyńska, Małgorzata, editor

Published
2016
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233. Vibrations and buckling of triangular graphene sheet in polymer matrix.

Author

Mazur, Olga and Awrejcewicz, Jan

Subjects
GRAPHENE, ORDINARY differential equations, NONLINEAR analysis
Abstract

The work is devoted to the study of vibrations and buckling of a graphene sheet (GS) with the shape of a right triangle, and embedded in a nonlinear polymer matrix. The research is based on the nonlocal elasticity theory and the application of the Bubnov‐Galerkin method. Due to the influence of the polymer surrounding, the study of vibrations is reduced to the analysis of a nonlinear cubic ordinary differential equation considering small‐scale effects. The nonlocal buckling problem for the triangular GS under in‐plane uniform compression is investigated including the finding of critical buckling load and the post‐buckling behaviour determined by the nonlinear medium effect. [ABSTRACT FROM AUTHOR]

Published
2024
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234. Nonlinear oscillation of a microbeam due to an electric actuation—Comparison of approximate models.

Author

Andrianov, Igor V., Awrejcewicz, Jan, Koblik, Steve G., and Starushenko, Galina A.

Subjects
NONLINEAR oscillations, NONLINEAR differential equations, ELECTRIC propulsion, OSCILLATIONS
Abstract

In this paper, oscillations of the electrically actuated microbeam are considered, described by strongly nonlinear differential equations. One of the essentially nonlinear effects is the pull‐in phenomenon, that is, the transition of the oscillatory regime to the attraction regime. This effect is considered in the paper on the basis of various approximate models. In particular, the error of replacing the original nonlinearity by its expansion in the Maclaurin series is estimated. It is shown that such an approximation can only be used for voltage values that are far from critical. Estimates are also given for initial displacements and velocities, which guarantee an oscillating character of solutions. The electrically activated oscillations of the microbeam are considered taking into account the geometric nonlinearity within the framework of the Kirchhoff model. The dependence of pull‐in value on geometric nonlinearity is investigated. [ABSTRACT FROM AUTHOR]

Published
2024
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