Results 11 to 20 of about 595 (186)
IEEE Access, 2018 The acquisition of aeroacoustics signals of wind turbines is of great significance in environmental noise assessment and fault monitoring of blades. The single acoustic sensor is simpler and more flexible than the acoustic sensors array but it lacks ...
Ya'nan Zhang, Shengbo Qi, Lin Zhou
doaj +1 more source
Numerical and Experimental Investigations of Axial Flow Fan with Bionic Forked Trailing Edge
Machines, 2023 To improve the performance of the aerodynamic properties and reduce the aerodynamic noise of an axial flow fan in the outdoor unit of an air conditioner, this study proposed a bionic forked trailing-edge structure inspired by the forked fish caudal fin ...
Zhong Liang +5 more
doaj +1 more source
Experimental Investigations on the Possibility to Apply the Corrugated Sheet Metal Used in the Past with Junkers Aircraft to Reduce Noise for Future European Aircraft. Other Noise Reduction Experiments for Future European Aircraft [PDF]
INCAS Bulletin, 2018 This paper shows that corrugated skin used in the past with Junkers aircraft to increase the fuselage and wing rigidity can lead to noise reduction for future European aircraft. If the pressure side of wing which is placed above the engine is corrugated,
Constantin SANDU +4 more
doaj +1 more source
Effect of Wavy Leading Edges on Airfoil Trailing-Edge Bluntness Noise
Aerospace, 2023 Among the several noise-generation mechanisms of airfoil self-noise, trailing-edge bluntness noise is an important noise source, which is caused by the vortex shedding at blunt trailing edges.
Yudi Xing +4 more
doaj +1 more source
Aerospace, 2023 The accurate prediction of helicopter rotor aerodynamics and aeroacoustics using Computational Fluid Dynamics (CFD) techniques still remains a challenge, as the over-dissipation of numerical schemes results in a higher diffusive rate of rotor wake and ...
Jinbin Fu, Yi Yuan, Luigi Vigevano
doaj +1 more source
Research progress on analysis and test methods of aircraft panel flutter
Hangkong gongcheng jinzhanAircraft panel flutter is a typical aeroelastic stability problem that occurs during supersonic flight，and is characterized by aerodynamic unilateral effects and significant structural and aerodynamic nonlinearity.
HE Chuanyang +4 more
doaj +1 more source
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 +5 more
doaj +1 more source
Optimization and engineering verification of excitation scheme for aircraft ground vibration test
Hangkong gongcheng jinzhanGround 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 +3 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 +3 more
doaj +1 more source
AcousticsAcoustic 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 +7 more
doaj +1 more source