Results 21 to 30 of about 1,929,704 (249)

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, Cunliang Liu, Fan Tong, Weiyang Qiao   +3 more
doaj   +1 more source

Numerical and Experimental Investigations of Modal Coherence Characteristics for the Determination of Broadband Noise in Flow Ducts

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, Cunliang Liu, Fan Tong, Weiyang Qiao   +3 more
doaj   +1 more source

Aerodynamic noise prediction of a high-speed centrifugal fan considering impeller-eccentric effect

Engineering Applications of Computational Fluid Mechanics, 2022
In this paper, the aerodynamic noise of a centrifugal fan with an eccentric impeller is investigated and analyzed by adopting a hybrid method combining detached-eddy simulation and the acoustic finite element method (FEM).
Ke Ren, Zhijun Shuai, Xi Wang, J. Jian, Tao Yu, Lieyi Dong, Wan-you Li, Chenxing Jiang   +7 more
semanticscholar   +1 more source

Study on Interior Aerodynamic Noise Characteristics of the High-Speed Maglev Train in the Low Vacuum Tube

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, Mengge Yu, Dawei Chen, Zhigang Yang   +3 more
doaj   +1 more source

Investigation on Aerodynamic Noise Characteristics of Coaxial Rotor in Hover

Applied Sciences, 2022
A numerical method based on Reynolds Averaged Navier–Stokes (RANS) equations and a high-efficiency trim model is developed to simulate the aerodynamics of a coaxial rotor.
Haotian Qi, Ping Wang, Linsong Jiang, Yang Zhang   +3 more
semanticscholar   +1 more source

Numerical Study on Aerodynamic Noise Reduction of Pantograph

Applied Sciences, 2022
A hybrid method incorporating the simulations of noise sources with delayed detached eddy simulation (DDES) and calculations of far-field noise with the Ffowcs Williams–Hawkings (FW-H) equation is used to study the suppression technique for the ...
Fangcheng Shi, Fushan Shi, X. Tian, Tiantian Wang   +3 more
semanticscholar   +1 more source

Aerodynamic noise of high-speed train pantographs: Comparisons between field measurements and an updated component-based prediction model

Applied Acoustics, 2021
Aerodynamic noise from pantographs becomes an important source of noise from trains at high speeds. Previous studies have mostly been based on numerical predictions using computational aeroacoustic methods, which require large computing resources, or ...
Xiaowan Liu, Jin Zhang, D. Thompson, E. L. Iglesias, G. Squicciarini, Zhiwei Hu, M. Toward, Daniel Lurcock   +7 more
semanticscholar   +1 more source

Methodology for identifying aerodynamic sound sources and mitigation measures for bogies in high-speed trains

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
doaj   +1 more source

Characterization of the aircraft bay/landing gear coupling noise at low subsonic speeds and its suppression using leading-edge chevron spoiler

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, Yong Liang, Tingrui Yue, Zhengwu Chen, Gareth J Bennett   +4 more
doaj   +1 more source

Investigating the aerodynamic drag and noise characteristics of a standard squareback vehicle with inclined side-view mirror configurations using a hybrid computational aeroacoustics (CAA) approach

The Physics of Fluids, 2023
This study investigates the aerodynamic noise generated and radiated from a standard squareback body with various inclined side-view mirrors using a hybrid computational aeroacoustics method based on a stress-blended eddy simulation coupled with the ...
K. K. Chode, H. Viswanathan, K. Chow, H. Reese   +3 more
semanticscholar   +1 more source