Results 241 to 250 of about 1,058,558 (285)
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Acoustical barrier for tonal noises
Applied Acoustics, 2005In this paper, a novel acoustical barrier based on the principle of the Helmholtz resonator is proposed for the mitigation of tonal noises and its in situ performance has been assessed in comparison with a reflecting barrier and an absorbent barrier.
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Human responses to the tonalness of aircraft noise
Noise Control Engineering Journal, 2010A study was conducted to examine the influence of changes in tonalness on annoyance ratings of aircraft noise. Stimuli used in this study were simulated using a program in which aircraft noise was decomposed into noise and tonal components. From these base components, additional aircraft sounds were created by varying the amplitude of the tonal ...
Shashikant More, Patricia Davies
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Psychoacoustically based tonality model for the evaluation of noise with tonal components
Journal of the Acoustical Society of America, 2015For many years in various product assessments, tonality measurement procedures have been applied to identify and quantify prominent tonal components. The perception and evaluation of sound events containing such components has become increasingly important, e.g., in the field of vehicle acoustics for the assessment of tonality due to alternative drives,
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Tonal noise sensitivity in hard drives
The Journal of the Acoustical Society of America, 2013High levels of noise have been found to cause offline events and data loss in information technology equipment in multiple data centers. Studies by this author and others showed these events were a result interaction between rotational storage media or hard drives (HDD) and air-borne noise.
Matthew L. Nickerson, Kent Green
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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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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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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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