Abstract
The Newtonian method is employed to obtain nonlinear mathematical model of motion of a horizontally cantilevered and inflexible pipe conveying fluid. The order magnitudes of relevant physical parameters are analyzed qualitatively to establish a foundation on the further study of the model. The method of multiple scales is used to obtain eigenfunctions of the linear free-vibration modes of the pipe. The boundary conditions yield the characteristic equations from which eigenvalues can be derived. It is found that flow velocity in the pipe may induced the 3:1, 2:1 and 1:1 internal resonances between the first and second modes such that the mechanism of flow-induced internal resonances in the pipe under consideration is explained theoretically. The 3:1 internal resonance first occurs in the system and is, thus, the most important since it corresponds to the minimum critical velocity.
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Communicated by LIU Zeng-rong
Project supported by the National Natural Science Foundation of China (No.10472083) and the National Natural Science Key Foundation of China (No.10532050)
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Xu, J., Yang, Qb. Flow-induced internal resonances and mode exchange in horizontal cantilevered pipe conveying fluid (I). Appl Math Mech 27, 935–941 (2006). https://doi.org/10.1007/s10483-006-0709-z
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DOI: https://doi.org/10.1007/s10483-006-0709-z