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163. Conclusion

Author

Andrianov, Igor V., Awrejcewicz, Jan, Danishevskyy, Vladyslav V., Öchsner, Andreas, Series editor, da Silva, Lucas F. M., Series editor, Altenbach, Holm, Series editor, Andrianov, Igor V., Awrejcewicz, Jan, and Danishevskyy, Vladyslav V.

Published
2018
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167. Nonlinear Elastic Problems

Author

Andrianov, Igor V., Awrejcewicz, Jan, Danishevskyy, Vladyslav V., Öchsner, Andreas, Series editor, da Silva, Lucas F. M., Series editor, Altenbach, Holm, Series editor, Andrianov, Igor V., Awrejcewicz, Jan, and Danishevskyy, Vladyslav V.

Published
2018
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168. Local Stresses in Elastic Fibrous Composites

Author

Andrianov, Igor V., Awrejcewicz, Jan, Danishevskyy, Vladyslav V., Öchsner, Andreas, Series editor, da Silva, Lucas F. M., Series editor, Altenbach, Holm, Series editor, Andrianov, Igor V., Awrejcewicz, Jan, and Danishevskyy, Vladyslav V.

Published
2018
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171. Introduction

Author

Andrianov, Igor V., Awrejcewicz, Jan, Danishevskyy, Vladyslav V., Öchsner, Andreas, Series editor, da Silva, Lucas F. M., Series editor, Altenbach, Holm, Series editor, Andrianov, Igor V., Awrejcewicz, Jan, and Danishevskyy, Vladyslav V.

Published
2018
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179. On 12-DOF active dampers to suppress multistability vibration of a 2-DOF rotor model subjected to simultaneous multiparametric and external harmonic excitations.

Author

Saeed, Nasser A., Awrejcewicz, Jan, Elashmawey, Randa A., El-Ganaini, Wedad A., Hou, Lei, and Sharaf, Mohamed

Abstract

This article addresses the bifurcation characteristics and vibration reduction of a 2 -DOF dynamical system simulating the nonlinear oscillation of an asymmetric rotor model subjected to simultaneous multiparametric and external excitations. To suppress the system's vibrations, two 1 / 2 -DOF active dampers are attached to the system in linear and cubic nonlinear forms via a magnetic coupling actuator. The closed-loop system model is derived as two differential equations with multi-control terms, including cubic, quantic, and septic, coupled nonlinearly to two first-order systems. Applying perturbation theory, the system model is solved, and the autonomous system describing the closed-loop slow-flow dynamics is obtained. Through numerical algorithms, the motion bifurcation is analyzed using various tools such as 2D and 3D bifurcation diagrams, two-parameter stability charts, basins of attraction, orbit plots, and time response profiles. The analytical investigations confirm that the uncontrolled model behaves like a hardening Duffing oscillator with multistability characteristics, displaying simultaneous mono-stable, bi-stable, tri-stable, or quadri-stable periodic oscillations depending on both the asymmetric nonlinearities and angular velocity. Subsequently, the influence of different control parameters is analyzed to determine the threshold between mono and multi-stability conditions. Finally, optimal control parameters are designed to eliminate multistability characteristics and achieve minimum and safe vibration levels. [ABSTRACT FROM AUTHOR]

Published
2024
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180. Modeling and Strength Calculations of Parts Made Using 3D Printing Technology and Mounted in a Custom-Made Lower Limb Exoskeleton.

Author

Śpiewak, Szczepan, Wojnicz, Wiktoria, Awrejcewicz, Jan, Mazur, Magdalena, Ludwicki, Michał, Stańczyk, Bartosz, and Zagrodny, Bartłomiej

Subjects
ROBOTIC exoskeletons, FUSED deposition modeling, MATERIALS testing, FINITE element method, THREE-dimensional printing
Abstract

This study is focused on the application of 3D-printed elements and conventional elements to create a prototype of a custom-made exoskeleton for lower limb rehabilitation. The 3D-printed elements were produced by using Fused Deposition Modeling technology and acrylonitrile butadiene styrene (ABS) material. The scope of this work involved the design and construction of an exoskeleton, experimental testing of the ABS material and numerical research by using the finite element method. On the basis of the obtained results, it was possible to deduce whether the load-bearing 3D-printed elements can be used in the proposed mechanical construction. The work contains full data of the material models used in FEM modeling, taking into account the orthotropic properties of the ABS material. Various types of finite elements were used in the presented FE models. The work is a comprehensive combination of material testing issues with the possibility of implementing the obtained results in numerical strength models of machine parts. [ABSTRACT FROM AUTHOR]

Published
2024
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182. Double Physical Pendulum with Magnetic Interaction

Author

Wojna, Mateusz, Awrejcewicz, Jan, Wasilewski, Grzegorz, 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, Świder, Jerzy, editor, Kciuk, Sławomir, editor, and Trojnacki, Maciej, editor

Published
2019
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