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- W4387144258 abstract "Abstract Structures submerged in fluids have a lower natural frequency due to the effective added mass of the attached fluid. Recent studies and experiments have shown that this fluid added mass effect is amplified as the gap between the structure and solid boundary closes. This tight tip clearance effect exists in many common engineering structures including inducers in turbopumps. Previous research has been performed to improve fluid/structure finite element models to predict these effects. These approaches can accurately predict the effect but are not viable for complex geometry and extremely tight tip clearances when meshing and excessive runtime problems occur. These challenges are particularly daunting in the design phase when a multitude of geometries and tip clearances may be considered. To remedy this, the tip clearance effect is first classified into three regions, one with an infinite boundary, an intermediate region, and one with a very tight gap. This paper uses finite element analyses of submerged discs to examine how model properties such as disc thickness affect these regions. The results of these parametric studies are then used to develop an equation using a sigmoid fit that is capable of predicting the natural frequency for all clearances which avoids additional finite element runs. This method is applied to an inducer geometry and compared to both the finite element and previous experimental results. The natural frequency predictions of this method are most accurate for inducer structural mode shapes where the blades are not in phase." @default.
- W4387144258 created "2023-09-29" @default.
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- W4387144258 date "2023-06-26" @default.
- W4387144258 modified "2023-10-18" @default.
- W4387144258 title "A Computationally Efficient Method for Predicting Tip Clearance Effects on the Natural Frequency of Submerged Discs and Inducers" @default.
- W4387144258 doi "https://doi.org/10.1115/gt2023-104243" @default.
- W4387144258 hasPublicationYear "2023" @default.
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