Results 21 to 30 of about 1,058,558 (285)
Applied Sciences, 2021 Hybrid electric propulsion is a promising solution to reduce aircraft emissions, thus improving the sustainability of the air transport. In this work, a hybrid aircraft configuration with a rear-mounted boundary layer ingestion (BLI) engine has been ...
Francesco Petrosino +2 more
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Evaluation of the Audibility Boundaries of Multirotor Systems of Different Configurations [PDF]
E3S Web of Conferences, 2023 The paper proposes a method for calculating the limits of audibility of multirotor systems such as quad- and hexacopters. The components of the proposed methodology are data on the noise of the device and the ambient noise, as well as the criterion of ...
Moshkov Petr, Timushev Sergey
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Practica Oto-Rhino-Laryngologica, 1983 In this paper, clinical characteristics of 3 kinds of tinnitus, i.e. tonal, band noise and tonal with noise background were analysed. Results were as follows:1) Out of 187 patients with tinnitus, 109 had band noise, 64 had tonal and 14 had tonal with noise background.2) Residual inhibition was observed in 64% of patients with band noise tinnitus and 49%
Kitahara, Masaaki +5 more
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Multi-Size-Mesh, Multi-Time-Step Algorithm for Noise Computation on Curvilinear Meshes [PDF]
, 2013 Aeroacoustic problems are often multi-scale and a zonal refinement technique is thus desirable to reduce computational effort while preserving low dissipation and low dispersion errors from the numerical scheme.
CORRE, Christophe +3 more
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The influence of booster design features on aicraft engine fan tonal noise
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2016 Fan and booster tonal noise makes significant contribution to the overall noise level of an aero engine, particularly in subsonic modes of operation.
Yu. D. Khaletskiy +2 more
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Increased Right Frontal Brain Activity During the Mandarin Hearing-in-Noise Test
Frontiers in Neuroscience, 2020 PurposePrevious studies have revealed increased frontal brain activation during speech comprehension in background noise. Few, however, used tonal languages.
Fengxiang Song +11 more
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International Journal of Turbomachinery, Propulsion and PowerFan noise from small cooling fans often contains multiple coexisting tonal components whose combined perceptual impact cannot be fully represented by conventional single-tone metrics.
Takefumi Nakano, Gaku Minorikawa
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AerospaceThe rotor–stator interaction noise is a major source of fan noise. Especially for low-speed fan stages, the tonal component is typically a dominant noise source.
Stephen Schade +3 more
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Experimental Characterization and Analytical Modelling of Rotor Tonal Noise
, 2020 In this study, the tonal noise due to the interaction ofa simplified rotor and a circular tower is characterized experimentally in a controlled environment. The test bench isinstalled in the anechoic chamber of ENSTA Paris, and is composed of a rotor made of three NACA 0012 untwisted blades set into motion by a motor.
Cotté, Benjamin +2 more
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Acta AcusticaAccurate measurement of sound pressure level (SPL) is a cornerstone for understanding acoustic communication, animal behavior, and ecological dynamics. Acoustic signals can be broadly categorized into broadband and tonal sounds.
Sasindran Shwetha +3 more
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