Results 61 to 70 of about 21,854 (248)
A weak-scattering model for turbine-tone haystacking outside the cone of silence
, 2011 We consider the scattering of sound by turbulence in a jet shear layer. The turbulent, time-varying inhomogeneities in the flow scatter tonal sound fields in such a way as to give spectral broadening, which decreases the level of the incident tone, but ...
McAlpine, A., Powles, C.J., Tester, B.J.
core +1 more source
Journal of the Acoustical Society of America, 2019 In this work, experimental studies are conducted to measure the aeroacoustics damping performances of 11 in-duct perforated plates in a cold-flow pipe with a variable Mach number.
Dan Zhao, C. Ji, B. Wang
semanticscholar +1 more source
Wind Energy, Volume 28, Issue 8, August 2025.ABSTRACT We develop a torque‐pitch control framework using deep reinforcement learning for wind turbines to optimize the generation of wind turbine energy while minimizing operational noise. We employ a double deep Q‐learning, coupled to a blade element momentum solver, to enable precise control over wind turbine parameters.
Martín Frutos +3 more
wiley +1 more source
Control of aerodynamic noise from cascade of flat plates by plasma actuators
Nihon Kikai Gakkai ronbunshu, 2017 At specific velocities, intense noise can be generated by the flow around a cascade of flat plates due to acoustic resonance. To reduce the aerodynamic noise, dielectric barrier discharge (DBD) plasma actuators (PAs) were utilized.
Makoto KUSUMOTO +3 more
doaj +1 more source
Survey of Semi-Empirical Jet Noise Models for Preliminary Aircraft Engine Design
Aerospace, 2023 Scientific research studies on jet noise generation have been ongoing since the early 1950s, when turbojets were first used in commercial aircraft. Several numerical methods have been developed with the aim of reducing the environmental issues related to
Francesco Petrosino, Mattia Barbarino
doaj +1 more source
Fluids, 2019 In the last decade, the drone market has grown rapidly for both civil and military purposes. Due to their versatility, drones demand is constantly increasing, with several industrial players joining the venture to transfer urban mobility to the air. This
P. Candeloro +3 more
semanticscholar +1 more source
State of the Art of Low‐Frequency Acoustic Modulation: Intensity Enhancement and Directional Control
Advanced Science, Volume 12, Issue 27, July 17, 2025.High intensity low‐frequency sound sources hold significant value in many fields. However, their long wavelength, strong penetrability, and tendency to diffract make direction control and intensity enhancement challenging. Acoustic generators and metamaterial‐based acoustic devices still face issues such as low energy efficiency, poor directional ...
Jingsong Xu +13 more
wiley +1 more source
Nihon Kikai Gakkai ronbunshu, 2018 Intense sound is radiated due to aeroacoustic feedback loop from a flow around the trailing edge of a curved plate with a kink shape such as a bonnet of an automobile.
Takenori MIYAMOTO +2 more
doaj +1 more source
Experimental and Numerical Investigation of Near-field Rotor Aeroacoustics [PDF]
, 2018 This work presents comparisons between experimental and numerical estimates of near-field rotor aeroacoustics in hover. The experiments took place at the Kazan National Research Technical University named after A. N. Tupolev (Kazan Aviation Institute).
Barakos, George N. +6 more
core
Review of Lattice Boltzmann Method Applied to Computational Aeroacoustics
Archives of Acoustics, 2019 This paper presents the research studies carried out on the application of lattice Boltzmann method (LBM) to computational aeroacoustics (CAA). The Navier-Stokes equation-based solver faces the difficulty of computational efficiency when it has to ...
W. Shao, Jun Li
semanticscholar +1 more source