Noise source identification for ducted fans
Citation:
Gareth J. Bennett, 'Noise source identification for ducted fans', [thesis], Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2006, pp 180Download Item:
Abstract:
Understanding combustion noise source mechanisms, designing efficient acoustic liners and optimising
active control algorithms for noise reduction requires the identification of the frequency and modal
content of the combustion noise contribution. Coherence-based noise source identification techniques
have been developed which can be used to identify the contribution of combustion noise to near
and far-field acoustic measurements of aero-engines. A number of existing identification techniques
from the literature, as well as some new techniques, are implemented and evaluated under controlled
experimental conditions. A series of tests are conducted to examine the efficacy of each of the
procedures for specific applications. An experimental rig was designed and built to gain a fundamental
physical understanding of the convection of combustion noise through the turbine of an aero-engine.
The identification techniques are applied to this rig, with the objective of separating the pressure
field into its constituent parts.
Author: Bennett, Gareth J.
Advisor:
Fitzpatrick, JohnQualification name:
Doctor of Philosophy (Ph.D.)Publisher:
Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing EngineeringNote:
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