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Mode Localization in Modular Trussed Structures and Subjected to Slightly Disordered Loading

da Fonseca Brasil, Reyolando Manoel Lopes Rebello

Journal of materials science and engineering. B, 2013-03, Vol.3 (3), p.177-182

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Título:
Mode Localization in Modular Trussed Structures and Subjected to Slightly Disordered Loading
Autor: da Fonseca Brasil, Reyolando Manoel Lopes Rebello
Assuntos: 光耦合 ; 几何刚度矩阵 ; 振动模式 ; 本地化 ; 桁架结构 ; 模块化 ; 结构组成 ; 装载模式
É parte de: Journal of materials science and engineering. B, 2013-03, Vol.3 (3), p.177-182
Notas: Mode localization, modulated structures, trusses.
Vibration modes localization in structures composed of several nominally identical lightly coupled modular substructures are studied. In an ideal perfect model, the vibration modes are global in nature, spreading to the whole structure. In real structures there are no two completely identical segments. Constructive or loading imperfections generate slight variation of the dynamic characteristics of each module. As the level of disorder grows and coupling between modules becomes lighter, the resulting vibration modes change considerably. Vibration energy may become confined to a few segments. This is the mode localization phenomenon. Models of long modular planar trussed structures are presented. Light coupling is considered between the initially identical modules. A certain degree of imperfection is introduced by adopting a slight variation in the loading of the modules. This will generate a small variation in the global stiffness of the system as the axial loads in the bars affect their geometric stiffness matrices.
Descrição: Vibration modes localization in structures composed of several nominally identical lightly coupled modular substructures are studied. In an ideal perfect model, the vibration modes are global in nature, spreading to the whole structure. In real structures there are no two completely identical segments. Constructive or loading imperfections generate slight variation of the dynamic characteristics of each module. As the level of disorder grows and coupling between modules becomes lighter, the resulting vibration modes change considerably. Vibration energy may become confined to a few segments. This is the mode localization phenomenon. Models of long modular planar trussed structures are presented. Light coupling is considered between the initially identical modules. A certain degree of imperfection is introduced by adopting a slight variation in the loading of the modules. This will generate a small variation in the global stiffness of the system as the axial loads in the bars affect their geometric stiffness matrices.
Idioma: Chinês;Inglês

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Mode Localization in Modular Trussed Structures and Subjected to Slightly Disordered Loading

da Fonseca Brasil, Reyolando Manoel Lopes Rebello

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