Results 201 to 210 of about 1,929,704 (249)

Aerodynamic Noise from Vehicles

The Journal of the Acoustical Society of America, 1973
The sources of vehicle noise and their importance relative to aerodynamic noise is given. Using the theory of Lighthill, a summary is given of aerodynamic noise theory and experiment. Following a review of the literature on axial and propeller fan noise and on vehicle cooling fan noise, the present state of the art is described, including present noise
Robert C. Chanaud, Douglas Muster
openaire   +1 more source

Circular saw aerodynamic noise

Journal of Sound and Vibration, 1992
Summary: The aerodynamically induced noise of an idling circular saw turning at high speed is investigated both experimentally and analytically. The origin of the noise is shown to be fluctuating lift forces acting on the teeth. The sources at the teeth radiate incoherently as baffled dipoles and account for the generated noise.
openaire   +1 more source

Aerodynamic Noise in Supersonic Wind Tunnels

Journal of the Aerospace Sciences, 1961
Hot-wire measurements in the free stream of a supersonic wind tunnel were made in the Mach number range of 1.6 to 5.0. I t is shown that the mass-flow fluctuations increase very rapidly with increasing Mach number. If the fluctuation field is assumed to consist of sound waves—an assumption tha t is consistent with the measurements—the sound intensity ...
openaire   +2 more sources

Aerodynamic noise assessment for a vertical axis wind turbine using Improved Delayed Detached Eddy Simulation

Renewable Energy, 2019
This paper presents the results of the aerodynamic and aeroacoustic assessment for a vertical axis wind turbine (VAWT). The Improved Delayed Detached Eddy Simulation (IDDES) technique and Ffowcs Williams and Hawkings (FW-H) acoustic analogy method are ...
Jie Su, H. Lei, Dai Zhou, Zhaolong Han, Y. Bao, Hongbo Zhu, Lei Zhou   +6 more
semanticscholar   +1 more source

A SURVEY OF AERODYNAMIC NOISE

1964
Abstract : A representative survey of the literature of aerodynamic noise was made. This was not intended to be an exhaustive list but rather to give the state of the field presently. It was found that much of the research done in this field is either experimental or semi-empirical.
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Investigation on aerodynamic noise for leading edge erosion of wind turbine blade

Journal of Wind Engineering and Industrial Aerodynamics, 2023
Hongyu Wang, Bin Chen
semanticscholar   +1 more source

The theoretical modelling of aerodynamic noise

Proceedings of the Indian Academy of Sciences Section C: Engineering Sciences, 1978
This paper is a review of the present state of understanding of aerodynamically generated noise.
openaire   +1 more source

Effect of serrated trailing-edge blades on aerodynamic noise of an axial fan

Journal of Mechanical Science and Technology, 2022
X. Ye, Nan Zheng, Ruixing Zhang, Chunxi Li   +3 more
semanticscholar   +1 more source

Aerodynamic Noise and the Plane Boundary

The Journal of the Acoustical Society of America, 1960
In an earlier paper entitled “Thoughts on Boundary Layer Noise” (Aeronautical Research Council Report 16727, 1954), it was pointed out that while the fluctuating pressures exerted upon a rigid boundary by a contiguous unsteady flow can be shown in a formal manner to generate sound as of a distribution of dipoles, it can be argued by means of the ...
openaire   +1 more source

Numerical simulation and analysis of the aerodynamic noise of a nautilus-inspired bionic multiblade centrifugal fan

Journal of Mechanical Science and Technology, 2022
Hongzhan Lv, Wenzhi Yang, W. J. Zhang
semanticscholar   +1 more source