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Results 1 - 10
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763
An Electronically Tunable Resonator for Noise Control
, 2001
"... Many engineering systems create unwanted noise that can be reduced by the careful application of engineering noise controls. When this noise travels down tubes and pipes, a tuned resonator can be used to muffle noise escaping from the tube. The classical examples are automobile exhaust and ventilati ..."
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and ventilation system noise. In these cases where a narrow frequency band of noise exists, a traditional engineering control consists of adding a tuned Helmholtz resonator to reduce unwanted tonal noise by reflecting it back to the source (Temkin, 1981). As long as the frequency of the unwanted noise falls
TONAL NOISE GENERATION
, 2013
"... par Miguel Ángel Fosas de Pando Tonal noise generation in flows around aerofoils: a global stability analysis ∗ Génération d’ondes acoustiques à fréquences discrètes autour d’un profil d’aile: analyse de stabilité globale ..."
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par Miguel Ángel Fosas de Pando Tonal noise generation in flows around aerofoils: a global stability analysis ∗ Génération d’ondes acoustiques à fréquences discrètes autour d’un profil d’aile: analyse de stabilité globale
Johnson Space Center Acoustics Office Habitability and Environmental Factors Branch Space and Life Sciences Directorate
"... The ventilation system aboard the International Space Station (ISS) is a crucial life-support system that provides the crew with circulated, filtered air; however, this system contains fans that generate unwanted tonal noise. The tonal noise produced by the fans may interfere with the daily activiti ..."
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The ventilation system aboard the International Space Station (ISS) is a crucial life-support system that provides the crew with circulated, filtered air; however, this system contains fans that generate unwanted tonal noise. The tonal noise produced by the fans may interfere with the daily
CHARACTERIZATION OF UNWANTED NOISE IN REALISTIC CAVITIES ∗
, 2008
"... The problem of the description of absorption and scattering losses in high-Q cavities is studied. The considerations are based on quantum noise theories, hence the unwanted noise associated with scattering and absorption is taken into account by introduction of additional damping and noise terms in ..."
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The problem of the description of absorption and scattering losses in high-Q cavities is studied. The considerations are based on quantum noise theories, hence the unwanted noise associated with scattering and absorption is taken into account by introduction of additional damping and noise terms
Numerical simulation of tonal
"... and broadband hydrodynamic noises of non-cavitating underwater propeller ..."
Effects of Noise and Tonal Stimuli on Hearing in Pinnipeds
"... The long-term goals of this effort are to assess the effects of tonal and broadband noise exposures on aerial and underwater hearing in three representative species of pinniped: the California sea lion (Zalophus californianus), the harbor seal (Phoca vitulina), and the northern elephant seal (Miroun ..."
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The long-term goals of this effort are to assess the effects of tonal and broadband noise exposures on aerial and underwater hearing in three representative species of pinniped: the California sea lion (Zalophus californianus), the harbor seal (Phoca vitulina), and the northern elephant seal
An Experimental Study of Tonal Noise Mechanism of Laminar Airfoils
"... This experimental works summarize the (1), aeroacoustic results of airfoil self-noise generated at Reynolds numbers between 1.0 x 105 and 6.0 x 105. The test facility is a newly built low noise and low flow turbulence open jet wind tunnel, where a NACA0012 airfoil was mounted to the exit nozzle hori ..."
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This experimental works summarize the (1), aeroacoustic results of airfoil self-noise generated at Reynolds numbers between 1.0 x 105 and 6.0 x 105. The test facility is a newly built low noise and low flow turbulence open jet wind tunnel, where a NACA0012 airfoil was mounted to the exit nozzle
RIPPLE, NOISE, CHARGE AND DISCHARGE: TURNING UNWANTED SIGNALS FOR YOUR ADVANTAGE
"... The designer of the battery monitoring system faces the difficult task of choosing the technology that will allow the extraction of information for the state of health of the battery while the battery is online. For the purpose of assessing the battery internal ohmic value, some battery monitoring m ..."
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performance information without injecting any signals to the battery by using the normally unwelcomed signals produced by charger/UPS equipment. Any AC power converter using the battery for the backup power source does inversely introduce the AC signals (often referred as the ripple and noises) across the DC
Inspecting Colour Tonality on Textured Surfaces
, 2004
"... We present a multidimensional histogram method to inspect tonality on colour textured surfaces, e.g. ceramic tiles. Comparison in the noise dominated chromatic channels is error prone. We perform vectorordered colour smoothing and generate a PCA-based reconstruction of a query tile based on a re ..."
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We present a multidimensional histogram method to inspect tonality on colour textured surfaces, e.g. ceramic tiles. Comparison in the noise dominated chromatic channels is error prone. We perform vectorordered colour smoothing and generate a PCA-based reconstruction of a query tile based on a
Tonal and Broadband Noise Calculations for Aeroacoustic Optimization of a Pusher Propeller
- JOURNAL OF AIRCRAFT
, 2010
"... A multidisciplinary analysis and optimization is carried out for a propeller in a real pusher aircraft configuration with the goal of reducing the radiated noise power levels, while preserving the aerodynamic efficiency. The optimization process involves the shape of the blade and the position of th ..."
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Cited by 2 (1 self)
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of the engine exhaust ducts. A coupling of the unsteady aerodynamic and structural-dynamic blade models provides the aeroelastic propeller model that drives a tonal and broadband aeroacoustic prediction. The tonal noise results from the periodic flow unsteadiness due to the nonaxial flight
Results 1 - 10
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763
