Keywords
Blisk Dynamics, Frequency Maps, Mode Veerings, Blade-Disk Interactions, Geometric Optimization, Vibrational Analysis
Abstract
This thesis presents an in-depth investigation into the vibrational dynamics of bladed disks (blisks), with a focus on understanding the conditions that lead to mode veerings and shifts in natural frequencies under varying geometric configurations. By utilizing maps of frequencies across nodal diameters, this study explores the effects of altering inner and outer disk radii, blade Aspect Ratios, and height ratios on the modal behavior of blisks. The study analyzes these geometric modifications to determine their influence on both mode interactions and frequency shifts, offering insights into how the number of veerings can be controlled. Mode veerings are of particular interest because they may indicate regions where multiple modes can be excited simultaneously, which is crucial to the stability and performance of turbomachinery components. A key contribution of this work is the development of a computational model that enables the rapid generation of the frequency maps. This offers an efficient alternative to conventional Finite Element Analysis tools such as ANSYS. The model significantly reduces computation time, making it possible to perform extensive parametric studies that would be very time-consuming using traditional methods. The findings demonstrate that specific geometric conditions either suppress or promote mode veerings, providing valuable guidelines for optimizing blisk designs. The results of this analysis are crucial for applications in high-performance systems like jet engines, where precise control over vibrational characteristics is essential. Future work will expand upon this by incorporating mistuning effects using piezoelectric patches to introduce localized stiffness changes. This will enable a deeper exploration into how mistuning affects the modal dynamics of blisks and provide a more comprehensive understanding of their vibrational behavior under operational conditions.
Completion Date
2024
Semester
Fall
Committee Chair
Kauffman, Jeffrey L.
Degree
Master of Science (M.S.)
College
College of Engineering and Computer Science
Department
Department of Mechanical and Aerospace Engineering
Degree Program
Master of Science in Space Systems Design and Engineering
Format
Identifier
DP0029022
Language
English
Release Date
12-15-2024
Access Status
Thesis
Campus Location
Orlando (Main) Campus
STARS Citation
Olore, Nicolas, "Advanced Analysis of Mode Veering Variations in Academic Blisks" (2024). Graduate Thesis and Dissertation post-2024. 57.
https://stars.library.ucf.edu/etd2024/57
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