Abstract
This paper focuses on the in-plane dynamics of fluid conveying straight–curved pipe under movable elastic support and excitation. Based on the existed equation of motion reported by other literature, the steady-state combined force is anew defined by the combination of Heaviside function for the first time, two forces originated from the movable elastic support and excitation are also introduced into the above equation. The modal superposition method with new shape functions quite simply constructed is used to study the dynamic characteristics of the present pipe, the characteristic equation for calculating natural frequency, and the accurate expression of steady-state displacement response are finally derived. Influences of movable elastic support and external excitation on the dynamic characteristics are studied deeply under given parameters. As a result, the 1st mode will be later to diverge than single straight pipe when there’s no elastic support; as the spatial coordinate of elastic support increases, the natural frequency will show a periodic-like variation, and the higher order the natural frequency is, the shorter cycle the variation has, besides, the 1st mode will be later to diverge, and the divergence period will expand simultaneously; the vibration may be magnified or demagnified compared with no elastic support. The present method is available in finding maximum mechanical quantities (including lateral displacement, rotation angle, bending moment and elastic restoring shear force) as well as their positions, which is beneficial in avoiding possible losses in engineering practice. The investigation can be radiated to study other forms of fluid–structure interaction dynamic problems concerning fluid conveying pipes with different supporting types or spatial structures.
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Zhao, Q., Liu, W. In-plane Dynamics of Ends-Clamped Fluid Conveying Straight–Curved Pipe. Iran J Sci Technol Trans Mech Eng 47, 307–318 (2023). https://doi.org/10.1007/s40997-022-00521-0
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DOI: https://doi.org/10.1007/s40997-022-00521-0