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Longitudinal–transversal internal resonances in Timoshenko beams with an axial elastic boundary condition
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Longitudinal–transversal internal resonances in Timoshenko beams with an axial elastic boundary condition
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Journal Article
Longitudinal–transversal internal resonances in Timoshenko beams with an axial elastic boundary condition
2021
Overview
The internal resonances between the longitudinal and transversal oscillations of a forced Timoshenko beam with an axial end spring are studied in depth. In the linear regime, the loci of occurrence of 1 :
ir
,
i
r
∈
N
, internal resonances in the parameters space are identified. Then, by means of the multiple time scales method, the 1 : 2 case is investigated in the nonlinear regime, and the frequency response functions and backbone curves are obtained analytically, and investigated thoroughly. They are also compared with finite element numerical simulations, to prove their reliability. Attention is paid to the system response obtained by varying the stiffness of the end spring, and it is shown that the nonlinear behaviour instantaneously jumps from hardening to softening by crossing the exact internal resonance value, in contrast to the singular (i.e. tending to infinity) behaviour of the nonlinear correction coefficient previously observed (without properly taking the internal resonance into account).
Publisher
Springer Netherlands,Springer Nature B.V
