Acoustic optimization of a contra-rotating propeller rig

Casagrande Hirono, F, Torija Martinez, AJ ORCID: and Elliott, AS ORCID: 2022, 'Acoustic optimization of a contra-rotating propeller rig' , The Journal of the Acoustical Society of America, 151 (4) , A83-A84.

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With the advance of unmanned aerial vehicles as a viable alternative for urban transportation, it is imperative that these vehicles have a low impact on community noise. Contra-rotating propeller technologies offer interesting advantages over traditional single-propeller equivalents, such as improved aerodynamic performance and redundancy in case of failure, but can be exceedingly noisy when not carefully designed. This work presents a parametric study for the acoustic optimization of a custom-made contra-rotating propeller rig. The rig consists of two commercially available motors mounted on a rotating stand built in-house and mounted inside an anechoic chamber. A far-field microphone arc is used to collect acoustic pressure data, and a load cell is used to measure total thrust. We investigate the effect of variations in the number of blades (between 2 and 6 on both rotors) and axial spacing (between 0.1 and 1 rotor diameter) on the radiated noise, while adjusting the rpm to maintain constant thrust. Overall sound pressure levels, far-field spectra, and directivities (overall SPL, tones, and broadband) are assessed to determine trade-offs and optimal choices in designing a contra-rotating propeller rig.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: The Journal of the Acoustical Society of America
Publisher: Acoustical Society of America (ASA)
SWORD Depositor: Publications Router
Depositing User: Publications Router
Date Deposited: 01 Aug 2022 11:05
Last Modified: 01 Aug 2022 11:05

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