Results 21 to 30 of about 94,319 (292)

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

Upstream-radiated rotor–stator interaction noise in mean swirling flow [PDF]

, 2005
A major component of the noise in modern aeroengines is rotor–stator interaction noise generated when the wake from the rotating fan impinges on a stator row downstream.
Cooper, A. J., Peake, N.
core   +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 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

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

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   +2 more sources

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

Signal Enhancement of Helicopter Rotor Aerodynamic Noise Based on Cyclic Wiener Filtering

Applied Sciences, 2022
The research on helicopter rotor aerodynamic noise becomes imperative with the wide use of helicopters in civilian fields. In this study, a signal enhancement method based on cyclic Wiener filtering was proposed given the cyclostationarity of rotor ...
Chengfeng Wu, Chunhua Wei, Yong Wang, Yang Gao   +3 more
doaj   +1 more source

Measured and calculated characteristics of wind turbine noise [PDF]

, 1981
The results of an analytical and experimental investigation of wind turbine noise are presented. Noise calculations indicate that for configurations with the rotor downwind of the support tower, the primary source of noise is the rapid change in rotor ...
Greene, G. C.
core   +1 more source

High‐Throughput Exfoliation of Optoelectronic‐Grade MoS2 via Turbulent‐Flow Wet Jet Milling

Advanced Functional Materials, EarlyView.
A scalable wet jet milling exfoliation method is demonstrated for producing optoelectronic‐grade MoS2 nanosheets using environmentally friendly ethyl cellulose in ethanol dispersion media. Guided by fluid dynamics modeling, this approach is optimized to achieve record‐high exfoliation throughput and concentration.
Maryam Khalaj, Shreyash S. Hadke, Lindsay E. Chaney, Janan Hui, Thomas Birge, Linda Li, Vinod K. Sangwan, Mark C. Hersam   +7 more
wiley   +1 more source