Volume 34 Issue 3
Mar.  2019
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Modal characteristics analysis for pipelines considering influence of fluid medium[J]. Journal of Aerospace Power, 2019, 34(3): 671-677. doi: 10.13224/j.cnki.jasp.2019.03.019
Citation: Modal characteristics analysis for pipelines considering influence of fluid medium[J]. Journal of Aerospace Power, 2019, 34(3): 671-677. doi: 10.13224/j.cnki.jasp.2019.03.019

Modal characteristics analysis for pipelines considering influence of fluid medium

doi: 10.13224/j.cnki.jasp.2019.03.019
  • Received Date: 2018-08-07
  • Publish Date: 2019-03-28
  • According to the requirement for the dynamic design of the external pipelines of aero-engine, and for solving the wet modal characteristics of complex pipelines, the Timoshenko beam theory and the energy method were used to derive the equation of the vibration of pipeline, in consideration of the effects of mass, pressure and velocity of fluid. Based on the existing pipe element in the ANSYS, an equivalent method to consider the pressure and velocity of fluid was established by using the stiffness and damping element, and it can be used in wet modal calculation of pipelines in ANSYS. Results showed that, the lateral force difference caused by the pressure of fluid could reduce the bending stiffness of the pipeline, and the axial tension caused by pressure could increase the bending stiffness; the effect of the pressure was related to the degree of axial constraint of the supports, and the Poissons ratio. The effect of the fluid velocity on the wet modal of the pipeline was related to the boundary conditions, the modes of vibration and the axial elongation of the pipeline. At high velocity, the modal frequency was zero, that was, the buckling instability occurring.

     

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