On the vibrations of three-dimensional angled piping systems conveying fluid |
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Authors: | Chol Hui Pak Sung Chul Hong Young Suk Yun |
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Affiliation: | 1. Department of Mechanical Engineering, Inha University, 253, Yonghyun-Dong, Nam ku, 420-751, Inchon, Korea 2. Department of Mechanical Engineering, Yosu National Fisheries College, 195, Kuk-Dong, Yosu, 550-749, Chonam, Korea
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Abstract: | The vibrations of three dimensional angled pipe systems conveying fluid are studied by using the finite element method. Extended
Hamilton's principle is applied to derive the equations of motion. The characteristics matries consisting of inertia, stiffness,
and Coriolis terms are derived by variational method, in which the effects of the internal flow velocity and pressure are
considered. The change of dynamic characteristics of the piping system due to the variation of flow velocity, pressure and
the geometry of the system is investigated. As a result, it can be found that the natural frequency of the system decreases
generally as the flow velocity and pressure increase and that the tendency is more significant as the geometry of the system
is similar to the straight pipe. |
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Keywords: | Piping System Internal Flow Static Instability Critical Velocity Natural Frequency |
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