Abstract

This study on flow-induced vibration provides valuable insights into the fundamental dynamics of fluid-structure interactions. The findings contribute to the development of predictive models and design guidelines for engineering systems susceptible to flow-induced vibration. By improving our understanding of this phenomenon, engineers can enhance the safety and reliability of various structures subjected to fluid flow, such as pipelines, flexhoses, and bellows. Flowinduced vibration is a phenomenon that occurs when fluid flow interacts with a structure, leading to oscillations and potentially causing mechanical damage. Understanding the underlying mechanisms and predicting the vibration characteristics is crucial for the design and safe operation of various engineering systems. This study presents an experimental and numerical investigation of flow-induced vibration, focusing on the effects of flow velocity, geometry, and material properties on vibration behavior. The experimental setup consists of a test rig comprising a closed-loop flow circuit and flow bench. The rig allows for adjustment of flow rate and observation of vibration responses using accelerometer sensors. Different geometric configurations and materials are considered to evaluate their influence on vibration characteristics. Primarily a series of stainless steel corrugated flexhoses following a curved flow path with a bend angle between 0 to 90 degrees and up to 3 inches in diameter were tested. A numerical study comparison is performed using two way coupled fluid-structure interface between fluid medium and flexhose convolutes. The numerical model uses commercial software to solve the continuum mechanics equations of the fluid control volume coupled with a structure finite element to solve the interactions of fluid-structure interface. The data collected includes extraction of vibration amplitudes and frequencies via a Fast Fourier Transform method with respect to the flow velocity. Results indicate a strong correlation between flow velocity and vibration amplitudes as well as increased bend angles leading to earlier flow-induced vibration event. Different geometries exhibit varying vibration patterns, highlighting the importance of structure design in mitigating flow-induced vibration. Furthermore, the material properties of the structure demonstrate significant effects on vibration behavior, suggesting the need for tailored material selection for specific applications.

Notes

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Graduation Date

2023

Semester

Summer

Advisor

Kapat, Jayanta

Degree

Doctor of Philosophy (Ph.D.)

College

College of Engineering and Computer Science

Department

Mechanical and Aerospace Engineering

Degree Program

Aerospace Engineering

Identifier

CFE0009807; DP0027915

URL

https://purls.library.ucf.edu/go/DP0027915

Language

English

Release Date

August 2023

Length of Campus-only Access

None

Access Status

Doctoral Dissertation (Open Access)

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