Results 41 to 50 of about 12,206 (226)

Acoustic Metamaterials in Aeronautics

Applied Sciences, 2018
Metamaterials, man-made composites that are scaled smaller than the wavelength, have demonstrated a huge potential for application in acoustics, allowing the production of sub-wavelength acoustic absorbers, acoustic invisibility, perfect acoustic mirrors
Giorgio Palma, Huina Mao, Lorenzo Burghignoli, Peter Göransson, Umberto Iemma   +4 more
doaj   +1 more source

Multidisciplinary Optimization Design of Low-Noise Propellers

Aerospace, 2023
In this paper, a multidisciplinary optimization design method and its verification of low-noise aircraft propellers considering aerodynamics, noise, and structural strength were carried out to further reduce the aerodynamic noise of the aircraft ...
Dongwen Xue, Qun Yan, Zhuohan Li, Kai Wei   +3 more
doaj   +1 more source

Generation and Mitigation Mechanism Studies of Nonlinear Thermoacoustic Instability in a Modelled Swirling Combustor with a Heat Exchanger

Aerospace, 2021
In the present work, 3D Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations are performed to investigate the generation and mitigation mechanism of combustion-sustained thermoacoustic instabilities in a modelled swirl combustor.
Yuze Sun, Dan Zhao, Xiaowei Zhu
doaj   +1 more source

Optimization and engineering verification of excitation scheme for aircraft ground vibration test

Hangkong gongcheng jinzhan
Ground vibration test is an important part of aircraft model development and strength verification. In aircraft ground vibration test，an appropriate excitation scheme can significantly shorten the test's period and improve the accuracy of mode ...
CHEN Haoyu, WANG Binwen, SONG Qiaozhi, LI Xiaodong   +3 more
doaj   +1 more source

Numerical evaluation of the aerodynamic and noise characteristics of an axial flow fan in a large aeroacoustic wind tunnel

Kongqi donglixue xuebao
This study numerically investigates the flow field and aerodynamic performance of the axial fan system in the 4 m × 3 m low-turbulent and aeroacoustic wind tunnel of Beihang University (BHAW).
Peiqing LIU, Peiqing LIU, Yue CHEN, Yue CHEN, Jin ZHANG, Jin ZHANG, Qiulin QU, Qiulin QU, Hao GUO, Hao GUO, Lichuan MA, Lichuan MA   +11 more
doaj   +1 more source

Theoretical Study of the Acoustic Installation Effects in Closed-Vein Wind Tunnels for the Experimental Characterization of Trailing Edge Noise

Applied Sciences, 2021
This study focuses on the acoustic installation effects that may occur during typical aeroacoustic experiments when the latter are conducted in a closed-vein wind tunnel.
Stéphane Redonnet
doaj   +1 more source

Experimental Prediction Method of Free-Field Sound Emissions Using the Boundary Element Method and Laser Scanning Vibrometry

Acoustics
Acoustic emissions play a major role in the usability of many product categories. Therefore, mitigating the emitted sound directly at the source is paramount to improve usability and customer satisfaction.
Andreas Wurzinger, Florian Kraxberger, Paul Maurerlehner, Bernhard Mayr-Mittermüller, Peter Rucz, Harald Sima, Manfred Kaltenbacher, Stefan Schoder   +7 more
doaj   +1 more source

Computational aeroacoustics of human phonation

EPJ Web of Conferences, 2013
The current paper presents a CFD model of flow past vibrating vocal folds coupled to an acoustic solver, which calculates the sound sources from the flow field in a hybrid approach.
Šidlof P., Zörner S.
doaj   +1 more source

Shock‐Assisted Flow Control System in Convergent‐Divergent Nozzle: A Numerical Study on Unconventional Protuberance With Different Geometry

Engineering Reports, Volume 8, Issue 5, May 2026.
A numerical investigation using 3D RANS simulations demonstrates significant effects of protuberance geometry—cubic, cylindrical, spherical, and conical—on shock‐induced thrust vectoring in supersonic nozzles. Cubic protuberances provide the maximum jet deflection (˜2°) with negligible thrust reduction.
Mohammadreza Soufivand, Davood Mokhtari, Mohammad Hojaji, Annunziata D'Orazio   +3 more
wiley   +1 more source

Effect of Blade Curvature on Fan Integration in Engine Cooling Module

Acoustics, 2020
Two blade curvatures representative of those found in automotive fans are compared. Measured performances are analyzed for forward and backward curved blades, either with or without heat-exchangers placed in front of them.
Manuel Henner, Bruno Demory, Mohamed Alaoui, Maxime Laurent, Benjamin Behey   +4 more
doaj   +1 more source