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Nonlinear Frequency Scattering of Broadband Noise in Turbomachinery (AIAA 2010-3805)
(2010)
Coherence based source analysis techniques can be used to identify the contribution of
broadband noise sources in the exhaust of a gas turbine and hence enable the design of noise
reduction devices. However, when the ...
Spatial Noise Source Identification of Tonal Noise in Turbomachinery Using the Coherence Function on a Modal Basis (AIAA-2011-2825)
(2011)
In modern helicopter engines, the core noise generated by the combustor and turbine stages dominates the core sound radiated from the engine exhaust. Identi cation of the specific contributions of each rotor-stator stage ...
SeMSA: a compact super absorber optimised for broadband, low-frequency noise attenuation
(2020)
The attenuation of low-frequency broadband noise in a light, small form-factor is an intractable challenge. In this paper, a new technology is presented which employs the highly efficient visco-thermal loss mechanism of a ...
Design Projects in Undergraduate Engineering
(2010)
Design has been extensively embedded within the undergraduate Engineering programmes through a restructuring of the curriculum to increase small group, project based learning. Complementing this strategy, a selection of ...
Implementation of Project Based Learning in a Large Engineering Programme
(2010)
The role of the engineer in industry has evolved, with today?s engineering businesses seeking engineers with abilities and attributes in two broad areas - technical understanding and enabling skills. Institutions within ...
Experimental study of realistic low noise technologies applied to a full scale nose landing gear
(2021)
The landing gear system is the dominant airframe noise source for most modern commercial aircraft during approach. This manuscript reports the results from the ALLEGRA (Advanced Low Noise Landing (Main and Nose) Gear for ...
A Comparison of Coherence Based Acoustic Source Identification Techniques
(2005)
Four techniques of source identification are examined and the performance of each
evaluated with experimental data. The procedures are all frequency domain methods
and depend to some extent on the coherence function. The ...
Nonlinear vibro-acoustic behaviour in a circular membrane oscillator
(2009)
Oscillating systems that produce noise at a frequency of excitation may have as an abatement
solution the increase of the frequency of excitation to above the audible frequency limit, viz.
20kHz. This approach may not ...