Influence of geometric and physical nonlinearities on the internal resonances of a finite continuous rod with a microstructure

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• 作者：Igor V. Andrianov^a ; ^{igor_andrianov@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Jan Awrejcewicz^b ; Vladyslav V. Danishevskyy^c ; Bernd Markert^a
• 关键词：Nonlinear vibrations ; Rod ; Microstructure ; Physical and geometric nonlinearities ; Dispersion ; Asymptotic homogenization method ; Space-discretization ; Method of multiple time scales ; Numerical simulation ; Internal resonance ; Energy transfers between modes
• 刊名：Journal of Sound and Vibration
• 出版年：2017
• 出版时间：6 January 2017
• 年：2017
• 卷：386
• 期：Complete
• 页码：359-371
• 全文大小：1652 K

文摘

In this work, nonlinear longitudinal vibrations of a finite composite rod are studied including geometric and physical nonlinearities. An original boundary value problem for a heterogeneous rod yielded by the macroscopic approximation obtained earlier by the higher-order asymptotic homogenization method is used. The effects of internal resonances and modes coupling are predicted, validated and analyzed. The defined novel continuous problem governed by PDEs is solved using space-discretization and the method of multiple time scales. We are aimed at understanding and analyzing how the presence of the microstructure influences the processes of mode interaction. It is shown that, depending on a scaling relation between the amplitude of the vibrations and the size of the unit cell, different scenarios of the modes coupling can be realized. Additionally to the asymptotic solution, numerical simulation of the modes coupling is performed by means of the Runge–Kutta fourth-order method. The obtained numerical and analytical results demonstrate good qualitative agreement.