Results 41 to 50 of about 404,526 (210)

Research on Noise Characteristics and Control Technology of Metro Energy Feedback Converter

机车电传动, 2020
The noise characteristics of metro energy feedback converter were experimentally studied to analyze the main noise source, noise transmission rules and the acoustic performance of the inlet/outlet structure.
Zhenpeng LI, Yulong ZHU, Jie DING, Xiang ZHANG, Yongsheng WANG, Xiaobin ZANG   +5 more
doaj  

Prediction and Reduction of Aerodynamic Noise of the Multiblade Centrifugal Fan

Advances in Mechanical Engineering, 2014
An aerodynamic and aeroacoustic investigation of the multiblade centrifugal fan is proposed in this paper, and a hybrid technique of combining flow field calculation and acoustic analysis is applied to solve the aeroacoustic problem of multiblade ...
Shuiqing Zhou, Jun Wang
doaj   +1 more source

Numerical Prediction of the Aerodynamics and Acoustics of a Tip Leakage Flow Using Large-Eddy Simulation

International Journal of Turbomachinery, Propulsion and Power, 2021
A Large-Eddy Simulation of the tip leakage flow of a single airfoil is carried out. The configuration consists of a non-rotating, isolated airfoil between two horizontal plates with a gap of 10 mm between the tip of the airfoil and the lower plate.
David Lamidel, Guillaume Daviller, Michel Roger, Hélène Posson   +3 more
doaj   +1 more source

Smart Blade Count Selection to Align Modal Propagation Angle with Stator Stagger Angle for Low-Noise Ducted Fan Designs

Aerospace
The rotor–stator interaction noise is a major source of fan noise. Especially for low-speed fan stages, the tonal component is typically a dominant noise source.
Stephen Schade, Robert Jaron, Lukas Klähn, Antoine Moreau   +3 more
doaj   +1 more source

ACAT1 Benchmark of RANS-Informed Analytical Methods for Fan Broadband Noise Prediction: Part II—Influence of the Acoustic Models

Acoustics, 2020
A benchmark dedicated to RANS-informed analytical methods for the prediction of turbofan rotor–stator interaction broadband noise was organised within the framework of the European project TurboNoiseBB.
Sébastien Guérin, Carolin Kissner, Pascal Seeler, Ricardo Blázquez, Pedro Carrasco Laraña, Hélène de Laborderie, Danny Lewis, Paruchuri Chaitanya, Cyril Polacsek, Johan Thisse   +9 more
doaj   +1 more source

Low Frequency Noise Contamination in Fan Model Testing [PDF]

, 2008
Aircraft engine noise research and development depends on the ability to study and predict the noise created by each engine component in isolation.
Brown, Clifford A., Schifer, Nicholas A.
core   +2 more sources

Vibroacoustic Optimization Study for the Volute Casing of a Centrifugal Fan

Applied Sciences, 2019
A numerical optimization is presented to reduce the vibrational noise of a centrifugal fan volute. Minimal vibrational radiated sound power was considered as the aim of the optimization.
Jianhua Zhang, Wuli Chu, Jinghui Zhang, Yi Lv   +3 more
doaj   +1 more source

Theoretical studies of tone noise from a fan rotor [PDF]

An analytical study was made of some possible rotor alone noise sources of dipole, quadrapole and monopole characters which generate discrete tone noise.
Chu, W. T., Digumarthi, R. V., Rao, G. V. R.   +2 more
core   +1 more source

Numerical simulation and experimental research on the aerodynamic performance of large marine axial flow fan with a perforated blade

Journal of Low Frequency Noise, Vibration and Active Control, 2018
In this study, some of the optimal parameters for a new-style marine axial flow fan are defined by using numerical simulation and experimental tests with a large marine axial flow fan, based on the analysis of the blade perforation’s influences on its ...
Xinglin Yang, Chenhui Wu, Huabing Wen, Linglong Zhang   +3 more
doaj   +1 more source

Effect of rotor-to-stator spacing on acoustic performance of a full-scale fan (QF-5) for turbofan engines [PDF]

A study was made of the effect of increasing the fan rotor-to-stator spacing on the noise level of a full-scale, single-stage, 1.6-pressure-ratio fan. Noise data were obtained with axial spacing of 1.14, 1.65, and 2.27 rotor chord lengths.
Balombin, J. R., Stakolich, E. G.
core   +1 more source