Results 21 to 30 of about 1,176,775 (247)

Numerical Investigation of an Unsteady Blade Surface Blowing Method to Reduce Rotor Blade-Vortex Interaction Noise

International Journal of Aerospace Engineering, 2022
This paper presents a numerical investigation of unsteady surface blowing using periodic variations of jet velocity with azimuthal angle to reduce helicopter rotor blade-vortex interaction (BVI) noise.
Yan Sun, Guohua Xu, Yongjie Shi
doaj   +1 more source

Experimental Analysis of Rotor Blade Noise in Edgewise Turbulence

Aerospace, 2023
This paper presents an experimental investigation into the effects of turbulence ingestion on the aerodynamic noise characteristics of rotor blades in edgewise flight. A small-scaled, two-bladed rotor was used in the study.
Nur Syafiqah Jamaluddin, Alper Celik, Kabilan Baskaran, Djamel Rezgui, Mahdi Azarpeyvand   +4 more
doaj   +1 more source

Fluid-Dynamic and Aeroacoustic Characterization of Side-by-Side Rotor Interaction

Aerospace, 2023
An investigation of twin corotating rotors’ interaction effects was performed by load (thrust and torque) measurements, flow field dynamics through Time-Resolved Particle Image Velocimetry, and acoustic emissions using a microphone array.
Ranieri Emanuele Nargi, Paolo Candeloro, Fabrizio De Gregorio, Giuseppe Ceglia, Tiziano Pagliaroli   +4 more
doaj   +1 more source

Modelling of tilt rotor mission performance to assess environmental impact [PDF]

, 2012
New technologies and new rotorcraft operations are being developed in order to meet new environmental requirements such as noise reduction and less pollutant emissions. In this project a parametric study was developed over a tilt rotor model in order to
Ruge Montilla, Jhonn Hamberth
core   +7 more sources

Experimental characterisation of rotor noise in tandem configuration [PDF]

Applied Acoustics, 2023
This paper presents a comprehensive investigation into the noise radiation characteristics of two rotors in a tandem configuration. Through an extensive experimental campaign, the study explores the effect of the separation distance between two rotors on the noise directivity patterns, spectral characteristics and temporal features of the radiated ...
Alper Celik, Nur Syafiqah Jamaluddin, Kabilan Baskaran, Stefano Meloni, Djamel Rezgui, Mahdi Azarpeyvand   +5 more
openaire   +3 more sources

Aero-acoustic performance of a continuous transonic wind-tunnel axial-flow compressor

Xibei Gongye Daxue Xuebao, 2022
A three-stage axial-flow compressor was developed for a continuous transonic wind tunnel. The rotor-stator spacing and the ratio of number of rotor blades to number of stator vanes were properly chosen for the purpose of aero-acoustic noise suppression ...
LONG Bingxiang, CHEN Jiming, CHEN Zhenhua, LIU Zongzheng, LIAO Daxiong   +4 more
doaj   +1 more source

Analysis of Torque Ripple and Cogging Torque Reduction in Electric Vehicle Traction Platform Applying Rotor Notched Design

Energies, 2018
Drive motors, which are used in the drive modules of electric cars, are interior permanent magnet motors. These motors tend to have high cogging torque and torque ripple, which leads to the generation of high vibration and noise.
Myeong-Hwan Hwang, Hae-Sol Lee, Hyun-Rok Cha   +2 more
doaj   +1 more source

Optimising the flux barriers of interior permanent magnet machine for noise reduction under certain load conditions

IET Electric Power Applications, 2021
This study proposes a method to reduce the electromagnetic noise of a double‐layer interior permanent magnet synchronous motor (DIPMSM) by optimising the flux barrier.
Haorui Ge, Baocheng Guo, Xin Qiu, Jianfei Yang, Chunmei Feng, Chenguang Bai, Zhen Jin, Yongmin Zhang   +7 more
doaj   +1 more source

Analysis of the Aeroacoustic Characteristics of a Rigid Coaxial Rotor in Forward Flight Based on the CFD/VVPM Hybrid Method

Aerospace, 2023
This study develops a hybrid solver with reversed overset assembly technology (ROAT), a viscous vortex particle method (VVPM), and a CFD program based on the URNS method, in order to study the aerodynamic and acoustic characteristics of coaxial rigid ...
Yucheng Yang, Guohua Xu, Yongjie Shi, Zhiyuan Hu   +3 more
doaj   +1 more source

Insight into the Impact of Blade Perforation on the Aerodynamics and Acoustics of a Two-Stage Variable-Pitch Axial Fan

Energies
For a two-stage variable-pitch axial fan, a perforation design in first-stage rotor blades was proposed to improve aerodynamic performance and reduce acoustic noise.
Chen Qiao, Xuemin Ye, Yunhao Wu, Chunxi Li   +3 more
doaj   +1 more source