Date of Award

3-2020

Document Type

Thesis

Degree Name

Master of Science in Aeronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

Richard G. Cobb, PhD

Abstract

The push for low cost and higher performance/efficient turbine engines have introduced a new demand for novel technologies to improve robustness to vibrations resulting in High Cycle Fatigue (HCF). There have been many proposed solutions to this, some passive and some active. With the advent of Additive Manufacturing (AM), new damping techniques can now be incorporated directly into the design and manufacture process to suppress the vibrations that create HCF. In this study, this novel unfused pocket damping technology is applied to a blade structure and the resulting damping effectiveness is quantified. The application of this technology to complex geometries will provide insight into both the underlying damping mechanism and its overall effectiveness. The finished blades are then computed tomography scanned to determine the as manufactured fill volume and to verify initial powdered locations. In this paper, first the damping quality is investigated when this technology is applied to a fan-like blade. Second, the strain limitations are investigated to understand limitations at room and elevated temperature. This research allowed an initial evaluation of the effectiveness of this technology to turbine engine fans as well as highlighting the overall effectiveness of this type of passive damping.

AFIT Designator

AFIT-ENY-MS-20-M-263

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