Results 11 to 20 of about 5,970 (262)
Numerical and Experimental Study on Mode Identification Error Characteristics of Fan Noise
Frontiers in Energy Research, 2022 The influence of different test methods on the accuracy of mode identification is not clear, and it is necessary to explore the error transfer characteristics in mode decomposition of fan noise. Numerical and experimental research studies are carried out
Kunbo Xu +3 more
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Frontiers in Energy Research, 2022 This paper presents a detailed investigation about the modal coherence characteristics of turbomachinery noise. The modal coherence characteristics of ducted noise at high frequencies are investigated by establishing three kinds of ducted sound source ...
Kunbo Xu +3 more
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Applied Sciences, 2022 As the next-generation high-speed transportation system, the low vacuum tube high-speed maglev system combines the tube with a certain degree of vacuum with the high-speed maglev train, which can realize high-speed operation under low aerodynamic ...
Jiali Liu +3 more
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Nihon Kikai Gakkai ronbunshu, 2020 Noise generated from Shinkansen trains mainly consists of wheel/rail noise, bridge noise and aerodynamic noise. Generally rolling noise and structure-borne noise from a viaduct increase in proportional to the second to third power of the train speed ...
Toki UDA, Toshiki KITAGAWA
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Advances in Mechanical Engineering, 2019 When the aircraft opens the bay door to let the landing gear either drop or retract, the incoming flow will result in a significant amount of coupling noise from the bay and the landing gear.
Kun Zhao +4 more
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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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