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| Applicability Analysis of Fluid30 Element for Calculation of Dynamic Characteristics of Coaxial Cylindrical Shell |
| Received:November 23, 2018 Revised:February 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.02.021 |
| KeyWord:coaxial cylindrical shell vibration characteristics Fluid30 element applicability |
| Author | Institution |
| XU Jian-hang |
Southwest Jiaotong University, Chengdu , China |
| YANG Yi-ren |
Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| Objective To analyze the applicability of the Fluid30 element for calculation of dynamic characteristics of a coaxial cylindrical shell model with inner annular gap fluid. Methods For the coaxial cylindrical shell model with inner annular gap fluid, the vibration characteristics of the shell were analyzed based on the "Fluid30 element" and the "theoretical fluid additional mass" respectively. Contrast calculations of variable gap width were carried out to explore the variation of the vibration characteristics of shell with no-dimensional radius ratio, analyze the influence of the discretization of Wave-Equation on the calculation results, and determine the suitable range of Fluid30 element. Results There was a nonlinear relationship between the radius ratio and the natural frequency; the smaller the radius ratio, the lower the natural frequency of the shell and the greater the change rate of the natural frequency with the radius ratio; the error caused by the discretization of the wave-equation increased with the decrease of the radius ratio; the relative error 10% was used as the criterion of fluid30 element applicability, the corresponding critical radius ratio of the (1,2) shell frequency was 1.2, the critical value of (1,3) shell frequency was 1.03 and the critical value of other shell frequency was less than 1.001. Conclusion The application range of Fluid30 element for different order frequencies is different. When the radius ratio is less than the critical value, the correlation frequency should be calculated by iterative method based on the theoretical fluid additional mass. |
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