Results 251 to 260 of about 1,760,515 (295)
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Passive airfoil tonal noise reduction by localized flow-induced vibration of an elastic panel
, 2020In this paper a novel passive control method is explored for airfoil tonal noise reduction using localized flow-induced vibration of a short elastic panel flush mounted on suction surface of a NACA 0012 airfoil at low Reynolds number.
Irsalan Arif, G. Lam, Di Wu, R. Leung
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Prediction of tonal ducted fan noise
Journal of Sound and Vibration, 2016Abstract This study introduces an analytical model aiming at predicting the tonal acoustic sources generated and radiated by the rotor–stator interaction in a fan stage. This model is able to cope with complex three-dimensional stator geometries and it fully accounts for cascade effects, characteristic of modern fan stages.
J. de Laborderie, S. Moreau
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Hybrid Prediction of Fan Tonal Noise
14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), 2008A hybrid method is used to simulate the downstream rotor-vane interaction tonal noise associated with the NASA Source Diagnostic Test (SDT) 22-in fan rig. A 3-D, unsteady, Reynolds-averaged Navier-Stokes (URANS) CFD simulation is used to predict the unsteady surface pressure on the exit guide vanes (EGVs).
Sheryl Grace +3 more
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Mapping Seismic Tonal Noise in the Contiguous United States
, 2020A subset of seismic signals generated in industrial environments displays spectral peaks organized in sequences of fundamental frequencies with multiple overtones, which we refer to as tonal noise (TN). Using one year of data from each of 1732 stations
O. Marcillo, J. MacCarthy
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Wheel-rail noise: impact, random, corrugation and tonal noise
Wear, 1996A small survey will be given of wheel-rail contact noise. Distinction is made between impact noise, random noise (amorphous noise), corrugation (rattling noise) and tonal noise (curve shrieking). An account will be given of the causes of the various types of noise, and also of what can be done to diminish them.
J.J. Kalker, F. Périard
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Delayed detection of tonal targets in background noise in dyslexia
Brain and Language, 2007Individuals with developmental dyslexia are often impaired in their ability to process certain linguistic and even basic non-linguistic auditory signals. Recent investigations report conflicting findings regarding impaired low-level binaural detection mechanisms associated with dyslexia.
Maria, Chait +5 more
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Effects of Noise and Tonal Stimuli on Hearing in Pinnipeds
2008Abstract : The practical objective for FY08 was to complete behavioral testing with three subjects against an equal energy matrix of tonal noise exposures (with similar characteristics to mid-frequency sonar) based on pre-determined combinations of stimulus duration and received sound pressure level.
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Active Tonal Noise Control for a Computer Cooling Fan
Volume 1: Symposia, Parts A and B, 2005The noise sources on a blade can be divided into a thrust force component along the rotating axis, and a drag component on the fan rotational plane. The radiated noise is a result of acoustic interference among all blades, and the two source components.
Wang, J, Huang, L
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Experimental determination of the tonal noise sources in a centrifugal fan
Journal of Sound and Vibration, 2003In this work, an experimental study about the aerodynamic tonal noise sources in an industrial centrifugal fan with backward-curved blades has been carried out. Acoustic pressure measurements at the fan exit duct and pressure fluctuation measurements on the volute surface (specially in the vicinity of the volute tongue) have been made for different ...
Sandra Velarde-Sua´rez +3 more
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The effect of acoustic forcing on an airfoil tonal noise mechanism
The Journal of the Acoustical Society of America, 2014The response of the boundary layer over an airfoil with cavity to external acoustic forcing, across a sweep of frequencies, was measured. The boundary layer downstream of the cavity trailing edge was found to respond strongly and selectively at the natural airfoil tonal frequencies. This is considered to be due to enhanced feedback.
Schumacher, K., Doolan, C., Kelso, R.
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