Results 31 to 40 of about 1,929,704 (249)

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, Lu Xiangyu, Zhang Qiuyun, Yu Hengsong   +3 more
doaj   +1 more source

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 ...

doaj   +1 more source

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, Song YANG, Dan WU, Bang-Chun WEN   +3 more
doaj   +1 more source

Analysis of Flow Field Structure Characteristics of Dual Impinging Jets at Different Velocities

Aerospace
The flow structure and unsteady evolution characteristics of dual impinging jets represent a flow problem of significant engineering importance in the aerospace field.
Yifan Zhao, Yuxiang Liang, Xunnian Wang, Pengfei Yan, Jiaxi Zhao, Rongping Zhang   +5 more
doaj   +1 more source

Aerodynamic noise from a high-speed train bogie with complex geometry under a leading car

Journal of Wind Engineering and Industrial Aerodynamics
Among the various aerodynamic noise sources associated with high-speed trains, the bogie regions, and particularly the leading bogie, contribute most to the overall noise.
Yuan He, David Thompson, Zhiwei Hu
semanticscholar   +1 more source

Optimization of Temperature Measurement Method for High-Pressure Gas Flow Standard Facility Based on Sonic Nozzle Array

Aerospace
To 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, Jiaxi Zhao, Tingting Liu, Rongping Zhang   +3 more
doaj   +1 more source

Experimental Investigation of Airfoil Instability Tonal Noise Reduction Using Structured Porous Trailing Edges

Applied Sciences
Reducing the tonal noise from airfoil instabilities has attracted significant interest from the aeronautical community in the past few years. The aim of this paper is to investigate the effect of structured porous trailing edges on the tonal noise ...
Yong Wang, Kongcheng Zuo, Peng Guo, Kun Zhao, Victor Feliksovich Kopiev   +4 more
doaj   +1 more source

Estimation methods for aerodynamic noise generated from the bogie section of Shinkansen trains by using wind tunnel test

Nihon Kikai Gakkai ronbunshu, 2017
A method has been developed for predicting the aerodynamic noise from the bogie of a high-speed train using a two-dimensional microphone array in a low-noise wind tunnel.
Nobuhiro YAMAZAKI, Toshiki KITAGAWA, Toki UDA, Takeshi KURITA, Yusuke WAKABAYASHI, Takanobu NISHIURA   +5 more
doaj   +1 more source

Research on intelligent diagnosis of deep-sea submersible bearing failures based on dual adaptive modeling [PDF]

AIP Advances
The 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, Dongjun Liu, Zekai Zong, Chaoge Wang, Ran Wang, Funa Zhou, Xiong Hu   +6 more
doaj   +1 more source

Flow structure and unsteady characteristics of fountain flow induced by dual impinging jets

Kongqi donglixue xuebao
The flow-field structure and mechanical characteristics of dual impinging jets are critical issues during the takeoff and landing phases of aircraft. However, the unsteady characteristics of the fountain effect induced by dual impinging jets have not yet
Yifan Zhao, Rongping Zhang, Rongping Zhang, Yuxiang Liang, Yuxiang Liang, Jiaxi Zhao, Jiaxi Zhao, Xunnian Wang   +7 more
doaj   +1 more source