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Rory Wallis and Hyunkook Lee
Direct sound that is captured by the upper layer of a three-dimensional (3D) microphone array is typically regarded as vertical interchannel crosstalk (VIC), since it tends to produce an undesired effect of the sound source image being elevated from the ...
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Simon Jekosch and Ennes Sarradj
The characterization of rotating aeroacoustic sources using microphone array methods has been proven to be a useful tool. One technique to identify rotating sources is the virtual rotating array method. The method interpolates the pressure time data sign...
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Thomas Fritz Geyer, Sahan Hasaranga Wasala and Ennes Sarradj
The interaction of a turbulent flow with the leading edge of a blade is a main noise source mechanism for fans and wind turbines. Motivated by the silent flight of owls, the present paper describes an experimental study performed to explore the noise-red...
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Jichun Zhang, Yiou Shen, Bing Jiang and Yan Li
Natural fiber and wood are environmentally friendly materials with multiscale microstructures. The sound absorption performance of flax fiber and its reinforced composite, as well as balsa wood, were evaluated using the two-microphone transfer function t...
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Jichun Zhang, Yiou Shen, Bing Jiang and Yan Li
Natural fiber and wood are environmentally friendly materials with multiscale microstructures. The sound absorption performance of flax fiber and its reinforced composite, as well as balsa wood, were evaluated using the two-microphone transfer function t...
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Mathew G. Pelletier, Greg A. Holt and John D. Wanjura
Accepted acoustic testing standards are available; however, they require specialized hardware and software that are typically out of reach economically to the occasional practitioner. What is needed is a simple and inexpensive screening method that can p...
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Tamás Kalmár-Nagy, Bendegúz Dezso Bak, Tamás Benedek, János Vad
Pág. 109 - 113
We describe a mechanical/acoustic study of a short-ducted axial flow fan. The purpose is to compare mechanical noise to that caused by flow phenomena.The eigenfrequencies of the fan are identified through measurement and finite element computations. The ...
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Kenji Hamabe, Takahiro Emoto, Osamu Jinnouchi, Naoki Toda and Ikuji Kawata
The definitive diagnosis of obstructive sleep apnea syndrome (OSAS) is made using an overnight polysomnography (PSG) test. This test requires that a patient wears multiple measurement sensors during an overnight hospitalization. However, this setup impos...
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David Valentín, Alexandre Presas, Mònica Egusquiza, Carme Valero and Eduard Egusquiza
One of the main causes of damage in hydraulic turbines is cavitation. While not all cavitation appearing in a turbine is of a destructive type, erosive cavitation can severely affect the structure, thus increasing maintenance costs and reducing the remai...
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