2026-09-21T04:07:43Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/114018 2023-07-11 col_2142_5131 col_2142_14800 com_2142_5130 com_2142_14799 com_2142_234

Saxton-Fox, Theresa 2022-04-29T21:47:45Z 2024-04-29T21:47:53Z 2021-12 Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01 The student, Mateo Diaz, accepted the attached license on 2021-12-08 at 13:11. The student, Mateo Diaz, submitted this Thesis for approval on 2021-12-08 at 13:15. This Thesis was approved for publication on 2021-12-09 at 15:36. DSpace SAF Submission Ingestion Package generated from Vireo submission #17407 on 2022-04-06 at 17:18:01 Made available in DSpace on 2022-04-29T21:47:45Z (GMT). No. of bitstreams: 3 DIAZ-THESIS-2021.pdf: 1968656 bytes, checksum: 9a82793d595978eb70dfa4774d2ecb5e (MD5) Master's Thesis.docx: 2518134 bytes, checksum: 2c49a72801464b8d53c9237ed9ada869 (MD5) LICENSE.txt: 4207 bytes, checksum: a1720d61f298f71df41a46b6db2d8936 (MD5) Previous issue date: 2021-12-09 Embargo set by: Seth Robbins for item 123383 Lift date: 2024-04-29T21:47:53Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only application/pdf en text Acoustics comparison of a novel reduced tip vortex rotary blade and a traditional blade Diaz, Mateo 2021-12-09 Engineering 2022-04-29T21:47:45Z Acoustics data collection was performed in an anechoic chamber for two propeller blade types, one traditional power optimized blade and one novel blade designed to reduce generated tip vortex strength. Both blade types had a 7.82” radius, a 2.25” root chord, a taper ratio of 2, a thrust coefficient of 0.003, and used an Eppler E387 airfoil. The blades were held at a steady 5000 rotations per minute as data were captured at 11 different microphone locations downwind of the rotor disc. Data were processed using a Fourier transform and analyzed. Key peaks in the processed data were identified and compared for each blade type and microphone location. Compared to the power optimized blade, the reduced vortex blade was found to have a greater number of distinct peaks. Additionally, for peaks that were present in the acoustic signatures of both blade types, the reduced vortex blade’s peaks were slightly greater in magnitude on average. Thesis eng http://hdl.handle.net/2142/114018 Copyright 2021 Mateo Diaz Aerospace Engineering Aerospace Engineering University of Illinois at Urbana-Champaign Thesis M.S.