Neste trabalho, é considerado um sistema formado por duas cordas paralelas, bi-apoiadas sujeitas a uma tensão constante e anexadas por uma camada viscoelástica. O deslocamento transversal do modelo é descrito por duas equações diferenciais parciais de segunda ordem acopladas devido ao termo viscoelástico. O sistema é resolvido através da metodologia que usa uma formulação matricial em blocos e a base dinâmica para determinar as frequências e as autofunções ou modos de vibração do problema.
In this study, a system composed by two elastically coupled structures is considered. A general theory in terms of a spatial differential operator and dynamical basis is developed. The frequencies and mode shapes of two systems, one composed by two cords and other consisting of two beams are determined from the block matrix formulation and from the use of dynamical basis, what simplify the solution of the modal equation of same order as the spatial operator. The forced response is given in terms of the impulse response matrix. The frequencies obtained are displayed in pairs and generate two types of movements, one synchronous and another asynchronous, depending on the frequency considered.
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