scholarly journals Reduction of Aerodynamic Noise from High-speed Pantograph using Porous Materials

2010 ◽  
Vol 5 (3) ◽  
pp. 469-484 ◽  
Author(s):  
Takeshi SUEKI ◽  
Mitsuru IKEDA ◽  
Takehisa TAKAISHI ◽  
Takeshi KURITA ◽  
Haruo YAMADA
Keyword(s):  
Porous Materials ◽  
High Speed ◽  
Aerodynamic Noise

scholarly journals Complexity Simulation on Application of Asymmetric Bionic Cross-Section Rod in Pantographs of High-Speed Trains

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Yan Cao ◽  
Yu Bai ◽  
Qiangfeng Wang
Keyword(s):  
Noise Reduction ◽  
Porous Materials ◽  
Cross Section ◽  
High Speed ◽  
Aerodynamic Resistance ◽  
Aerodynamic Noise ◽  
Practical Application ◽  
Bionic Design ◽  
High Speed Trains ◽  
Bionic Structure

Ground transportation means and aircrafts with high-speed running are composed of many rod components. Aerodynamic noise generated therefrom is very outstanding. Reduction of the aerodynamic noise of rods becomes a hot topic in recent years. Most reported studies are tentative researches on aerodynamic noise of a pantograph or involve noise reduction of the pantograph with using porous materials or reshaping rod surfaces. Through using porous materials and reshaping rod surface, the aerodynamic noise of pantograph can be reduced to a certain extent, but the aerodynamic resistance will be increased and it is not convenient for practical application in engineering. Regarding this situation, the paper explores noise reduction performance of a feather on the back of a carrier pigeon and conducts the bionic design on rod surface. Through numerical simulation, the paper researches noise reduction performance of the bionic structure on the rod surface, reveals the mechanism of bionic noise reduction, and explores noise reduction effects of bionic structural rods on pantographs of the high-speed trains.

scholarly journals Aerodynamic Noise Reduction using Porous Materials and their Application to High-speed Pantographs

2009 ◽  
Vol 50 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Takeshi SUEKI ◽  
Mitsuru IKEDA ◽  
Takehisa TAKAISHI
Keyword(s):  
Noise Reduction ◽  
Porous Materials ◽  
High Speed ◽  
Aerodynamic Noise

Numerical Calculation of Aerodynamic Noise for the Nose Cone Surface in High Speed Airflow Field

2014 ◽  
Vol 488-489 ◽  
pp. 886-891
Author(s):  
Ai Jian Zheng ◽  
Feng Niu ◽  
Hai Jiang Zhu
Keyword(s):  
Numerical Calculation ◽  
High Speed ◽  
Aerodynamic Noise ◽  
Element Analysis ◽  
Analysis Theory ◽  
Nose Cone ◽  
Flow Induced Noise ◽  
Airflow Field ◽  
Boundary Element Analysis ◽  
Acoustic Boundary Element

This paper presents two nose cones models and their numerical calculation of aerodynamic noise in high speed airflow field combining the analysis theory of fluid dynamics with the acoustic boundary element analysis method. The noise sound pressure levels (SPL) of these two models are calculated under the different speed airflow. And we compare the SPL of the better model with that of commercial nose cone models. These simulated results show that the aerodynamic noise of the nose cone with a ellipsoid head has lower flow-induced noise than that of commercial nose cone models at relative high air flow velocities at most frequencies.

Recent developments in the prediction and control of aerodynamic noise from high-speed trains

2015 ◽  
Vol 3 (3) ◽  
pp. 119-150 ◽  
Author(s):  
David J. Thompson ◽  
Eduardo Latorre Iglesias ◽  
Xiaowan Liu ◽  
Jianyue Zhu ◽  
Zhiwei Hu
Keyword(s):  
High Speed ◽  
Aerodynamic Noise ◽  
Recent Developments ◽  
High Speed Trains ◽  
Prediction And Control ◽  
And Control

Impact of Impeller Casing Treatment on the Acoustics of a Small High Speed Centrifugal Compressor

2018 ◽  
Author(s):  
Sidharath Sharma ◽  
Jorge García-Tíscar ◽  
John M. Allport ◽  
Martyn L. Jupp ◽  
Ambrose K. Nickson
Keyword(s):  
Centrifugal Compressor ◽  
High Speed ◽  
Pressure Fluctuations ◽  
Operating Conditions ◽  
Aerodynamic Noise ◽  
Noise Sources ◽  
Casing Treatment ◽  
Active Research ◽  
Ported Shroud ◽  
The Impact

Ported shroud casing treatment is widely used to delay the onset of surge and thereby enhancing the aerodynamic stability of a centrifugal compressor by recirculating the low momentum fluid in the blade passage. Performance losses associated with the use of recirculation casing treatment are well established in the literature and this is an area of active research. The other, less researched aspect of the casing treatment is its impact on the acoustics of the compressor. This work investigates the impact of ported shroud casing treatment on the acoustic characteristics of the compressor. The flow in two compressor configurations viz. with and without casing treatment operating at the design operating conditions of an iso-speed line are numerically modelled and validated with experimental data from gas stand measurements. The pressure fluctuations calculated as the flow solution are used to compute the spectral signatures at multiple locations to investigate the acoustic phenomenon associated with each configuration. Propagation of the frequency content through the ducts has been estimated with the aid of method of characteristics to enhance the content coming from the compressor. Expected tonal aerodynamic noise sources such as monopole (buzz-saw tones) and dipole (Blade Pass Frequency) are clearly identified in the acoustic spectra of the two configurations. The comparison of two configurations shows higher overall levels and tonal content in the case of a compressor with ported shroud operating at design conditions due to the presence of ‘mid-tones’.

The Application of Numerical Simulation Technology in the External Aerodynamic Noise Field of High-Speed Train

2011 ◽  
Vol 101-102 ◽  
pp. 197-201 ◽  
Author(s):  
Zhen Gyu Zheng ◽  
Ren Xian Li
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
High Speed ◽  
Aerodynamic Noise ◽  
Dipole Source ◽  
Center Line ◽  
High Speed Train ◽  
Noise Field ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Pressure

This paper utilized the Boundary Element Method (BEM) combined with the Computational Fluid Dynamics (CFD) based on Lighthill’s analogy in the high-speed train model, and converted the fluctuating flow pressure near the vehicle’s surface into the dipole source boundary condition in acoustics grid, eventually succeeded in completing the numerical simulation of aerodynamic noise field outside the high-speed train by introducing the dipole source boundary condition into the train BEM model. The results show that the main aerodynamic noise controlling area is 15-20 meters away from the track center line in the horizontal direction, and the Sound Press Level (SPL) is 63-72dB.

Aerodynamic Noise Generated by High-Speed Trains

1979 ◽  
Vol 13 (1) ◽  
pp. 13 ◽  
Author(s):  
W. F. King III ◽  
D. Bechert
Keyword(s):  
High Speed ◽  
Aerodynamic Noise ◽  
High Speed Trains
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