Results 1 to 10 of about 1,760,416 (196)
A revisit of the tonal noise of small rotors. [PDF]
Proc Math Phys Eng Sci, 2020 In this study, asymptotic analysis of the frequency-domain formulation to compute the tonal noise of the small rotors in the now ubiquitously multi-rotor powered drones is conducted. Simple scaling laws are proposed to evaluate the impacts of the influential parameters such as blade number, flow speed, rotation speed, unsteady motion, thrust and ...
Zhong S, Zhou P, Fattah R, Zhang X.
europepmc +7 more sources
Effects of Tonal Noise on Workers' Annoyance and Performance.
Noise Health, 2021 Objective: Numerous references indicate that the subjectively assessed tonal noise annoyance is higher than that of broadband noise. There are no criteria for the impact of tonal noise in assessing the occupational environment for both indoor areas and workplaces. Materials and Methods:
Radosz J.
europepmc +4 more sources
Applied SciencesReducing the tonal noise from airfoil instabilities has attracted significant interest from the aeronautical community in the past few years. The aim of this paper is to investigate the effect of structured porous trailing edges on the tonal noise ...
Yong Wang +4 more
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Inlet gap effect on aerodynamics and tonal noise generation of a voluteless centrifugal fan
Journal of Sound and Vibration, 2022 In this paper, the gap effects on the aerodynamics and tonal noise generation of voluteless centrifugal fans are studied based on different gap geometries.
Lars Davidson, Martin Ottersten
exaly +2 more sources
Acoustics, 2020 An experimental and analytical study of the tonal trailing-edge noise of a symmetric NACA-0012 aerofoil and of a cambered SD7003 aerofoil has been achieved. It provides a complete experimental database for both aerofoils and improves the understanding of
Gyuzel Yakhina +4 more
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Experimental Determination of the Masking Threshold for Tonal Powertrain Noise in Electric Vehicles
Acoustics, 2023 Tonal powertrain noise can have a strong negative impact on vehicle sound quality. Therefore, an assessment of the perceptibility of tonal noise with respect to masking noise is essential for the vehicle development process.
Victor Abbink +2 more
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Inlet Gap Effect on Tonal Noise Generated from a Voluteless Centrifugal Fan
International Journal of Turbomachinery, Propulsion and Power, 2022 In this study, three voluteless centrifugal fans are compared for their aeroacoustic performances. The tonal noise is predicted by coupling the IDDES with Formulation 1A of Farassat. The sources of the tonal noise at the blade passing frequency (BPF) are
Martin Ottersten +2 more
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On the receptivity of aerofoil tonal noise: an adjoint analysis [PDF]
Journal of Fluid Mechanics, 2017 For moderate-to-high Reynolds numbers, aerofoils are known to produce substantial levels of acoustic radiation, known as tonal noise, which arises from a complex interplay between laminar boundary-layer instabilities, trailing-edge acoustic scattering and upstream receptivity of the boundary layers on both aerofoil surfaces.
Fosas de Pando, Miguel +2 more
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International Journal of Environmental Research and Public Health, 2021 Recently in Japan, noises from wind turbines and domestic use heat sources sometimes cause an increase in noise annoyance owing to low-frequency tonal components.
Miki Yonemura
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Landing gear interwheel tonal noise characterization with the Boundary Element Method
Journal of Sound and Vibration, 2019 Landing gear noise is mainly broadband in nature, but it can also feature some tonal contributions. Tonal noise significantly increases noise annoyance and can originate from facing cavities in landing gear wheels.
Philippe Druault, Laurent Sanders
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