Results 21 to 30 of about 6,303 (162)

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

Effect of Controlled Muscle Activation in a Unilateral Vocal Fold Polyp Setting on Vocal Fold Vibration

Applied Sciences, 2022
Unilateral vocal fold polyps can lead to incomplete glottal closure and irregular vocal fold vibration. Depending on polyp size and resulting dysphonia severity, voice therapy or surgery may be recommended.
Mingjun Ji, Boquan Liu, Jack Jiang, Matthew R. Hoffman, Jinwei Lan, Jin Fang   +5 more
doaj   +1 more source

Comparison of outflow boundary conditions for subsonic aeroacoustic simulations [PDF]

, 2011
Aeroacoustics simulations require much more precise boundary conditions than classical aerodynamics. Two classes of non-reflecting boundary conditions for aeroacoustics are compared in the present work: characteristic analysis based methods and Tam and ...
H. Deniau, Lamarque, Nicolas, Fosso Pouangue, Arnaud, A. Fosso P., N. Lamarque, Fosso P., A., Deniau, Hugues, T. Poinsot, Poinsot, Thierry   +8 more
core   +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

Effects of Aeroelastic Walls on the Aeroacoustics in Transonic Cavity Flow

Aerospace, 2022
The effects of elastic cavity walls on noise generation at transonic speed are investigated for the generic M219 cavity. The flow is simulated with the Spalart–Allmaras (SA) improved delayed detached-eddy simulation (IDDES) turbulence model in ...
Stefan Nilsson, Hua-Dong Yao, Anders Karlsson, Sebastian Arvidson   +3 more
doaj   +1 more source

The Technique of MIEELDLD in Computational Aeroacoustics [PDF]

Journal of Applied Mathematics, 2012
The numerical simulation of aeroacoustic phenomena requires high‐order accurate numerical schemes with low dispersion and low dissipation errors. A technique has recently been devised in a Computational Fluid Dynamics framework which enables optimal parameters to be chosen so as to better control the grade and balance of dispersion and dissipation in ...
openaire   +6 more sources

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

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

Applicability of Aeroacoustic Scaling Laws of Leading Edge Serrations for Rotating Applications

Acoustics, 2020
The dominant aeroacoustic mechanisms of serrated leading edges, subjected to highly turbulent inflow conditions, can be compressed to spanwise decorrelation effects as well as effects of destructive interference.
Till M. Biedermann, Pasquale Czeckay, Nils Hintzen, Frank Kameier, C. O. Paschereit   +4 more
doaj   +1 more source

Assessment of Optimization Methods for Aeroacoustic Prediction of Trailing-Edge Interaction Noise in Axisymmetric Jets

Mathematics, 2021
Our concern in this paper is in the fine-tuning of the arbitrary parameters within the upstream turbulence structure for the acoustic spectrum of a rapid-distortion theory (RDT)-based model of trailing-edge noise.
Sarah Stirrat, Mohammed Z. Afsar, Edmondo Minisci   +2 more
doaj   +1 more source