Step-by-Step Numerical Prediction of Aerodynamic Noise Generated by High Speed Trains
Chinese Journal of Mechanical Engineering, 2022 In this paper, the unsteady flow around a high-speed train is numerically simulated by detached eddy simulation method (DES), and the far-field noise is predicted using the Ffowcs Williams-Hawkings (FW-H) acoustic model.
Tian Li +3 more
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Design of portable multi-channel high precision acquisition system based on FPGA
Dianzi Jishu Yingyong, 2019 In order to meet the high-speed, parallel and high-precision data acquisition of the multi-point sensitive pressure sensor signals on the surface of the rotor blade, and with the functions of program-controlled gain amplification and anti-aliasing ...
Wang Wei +3 more
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Effects of Shear Layer Characteristics on Acoustic Propagation and Source Localization
Xibei Gongye Daxue Xuebao, 2019 The shear layer characteristics of an open-jet acoustic wind tunnel are of key importance on measurements of aeroacoustics. The effects of thickness, spreading angle and strength of shear layer on acoustic propagation and source localization are ...
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Analysis of Flow Field Structure Characteristics of Dual Impinging Jets at Different Velocities
AerospaceThe flow structure and unsteady evolution characteristics of dual impinging jets represent a flow problem of significant engineering importance in the aerospace field.
Yifan Zhao +5 more
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PREDICTION AND VALIDATION FOR THE AERODYNAMIC NOISE OF HIGH-SPEED TRAIN POWER CAR [PDF]
Transport Problems, 2018 The aerodynamic noise of high-speed train power car was investigated in this article. The full-scale power car was first modeled, and the external steady flow field was computed by a realizable k-ε turbulence model.
Shi-jie JIANG +3 more
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Turbulent boundary layer noise : direct radiation at Mach number 0.5 [PDF]
, 2013 Boundary layers constitute a fundamental source of aerodynamic noise. A turbulent boundary layer over a plane wall can provide an indirect contribution to the noise by exciting the structure, and a direct noise contribution.
GLOERFELT, Xavier, BERLAND, Julien
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Investigation of flow structures involved in sound generation by two- and three-dimensional cavity flows [PDF]
, 2011 Proper Orthogonal Decomposition and Stochastic Estimation are combined to shed some light on the link between organized flow structures and noise generation by turbulent flows.
DRUAULT, Philippe +5 more
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AerospaceTo improve the accuracy of the wind tunnel test, relying on the high-pressure gas source of the China Aerodynamic Research and Development Center, a secondary flow standard facility based on a sonic nozzle array was developed, with a pressure range of (1~
Zhihao Zhang +3 more
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Research on intelligent diagnosis of deep-sea submersible bearing failures based on dual adaptive modeling [PDF]
AIP AdvancesThe deep-sea environment is extremely complex, and rolling bearings in submersible propulsion systems are the core moving components. Facing complex conditions and multiple faults, traditional bearing fault diagnosis methods lack adaptability—failing to ...
Kunbo Xu +6 more
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Trailing Edge Noise Reduction by Passive and Active Flow Controls [PDF]
, 2014 This paper presents the results on the use of porous metal foams (passive control) and dielectric barrier surface plasma actuations (active control) for the reduction of vortex shedding tonal noises from the nonflat plate type trailing edge serration in ...
Kim, JH +7 more
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