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Far-field fan noise assessment from in-duct phased array measurements methodology
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Flight Dynamics.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The report hereby presents the work performed within the Acoustic design and R&T service of Safran Aircraft Engines in Vi11arnche through a six month master thesis. The service is in charge of the development of noise prediction methods, analysis of tests results, design supervision, definition of specifications. The primary purpose of the present work was to develop a method of assessing the far-field pressure of the turbofan engine without far-field measurements. The foundation of the method relying on a particular signal processing method called beamforming, a complete explanation of the so-called method was realized according to the bibliography, which detects with precision unique modes. The numerical process of the method has been entirely developed, and a law to find the relation between the in-duct and farfield directivity angles was conceived and explained. The validation of the transfer function method was started, using the measurements of a test bench in Ecole Centrale de Lyon.

Place, publisher, year, edition, pages
2017. , p. 48
Series
TRITA-AVE, ISSN 1651-7660 ; 2017:63
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-223328OAI: oai:DiVA.org:kth-223328DiVA, id: diva2:1183346
External cooperation
Safran Aircraft
Examiners
Available from: 2018-02-20 Created: 2018-02-16 Last updated: 2018-02-20Bibliographically approved

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