scholarly journals Simulation Analysis on Noise Reduction Effect of Sound Barriers with Different Geometric Shapes for High-Speed Train

2019 ◽  
Vol 612 ◽  
pp. 052038
Author(s):  
Gengfei Liu ◽  
Ruxiao Wang ◽  
Xiaori Liu ◽  
Su Li ◽  
Chang Tong
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Simulation Analysis ◽  
High Speed Train ◽  
Geometric Shapes ◽  
Sound Barriers ◽  
Reduction Effect

scholarly journals Numerical Study on Noise Reduction of High-Speed Train Based on Non-Smooth Surface

2020 ◽  
Author(s):  
Jiyou Huang ◽  
Haiyan Zhu ◽  
Haifei Wei ◽  
Junhai Huang ◽  
Qiying Xu
Keyword(s):  
Drag Reduction ◽  
Noise Reduction ◽  
High Speed ◽  
Smooth Surface ◽  
Numerical Study ◽  
Aerodynamic Resistance ◽  
Acoustic Power ◽  
Noise Model ◽  
High Speed Train ◽  
Reduction Effect

In this paper, a 350 km/h high-speed train is taken as the research object. Using the realizable k-ε model to calculate the steady-state flow field around the train, based on the results, calculating aerodynamic noise source of the train body surface by using the broadband noise model. The drag, lift and acoustic data of the train with the non-smooth surface units arranged on different positions of the vehicle are analyzed and compared, so as to analyze the influence of the layout of the non-smooth surface units on the drag reduction and noise reduction of the train. The simulation results show that when the non-smooth surface units are arranged in the bogie area, the aerodynamic resistance of the head and the intermediate vehicle can be effectively reduced, with the drag reduction effect of 12.2% in the head vehicle and 26.9% in the intermediate vehicle; when the non-smooth surface units are arranged on the nose of the train, for the intermediate vehicle, the drag reduction effect is 9.3%, and 11.5% when arranged on the transition area; when the non-smooth surface units are arranged on the nose of the train, there are quite a number of scattered points of low surface acoustic power in the streamline area of the tail vehicle, in which the lowest surface acoustic power level is only 50 dB, which is 25.3% lower than that of the train without non-smooth surface units.

Noise reduction effect by configuration of sound barriers in Sanyo Shinkansen railway line

2019 ◽  
Vol 2019.29 (0) ◽  
pp. IJ102
Author(s):  
Takuma NITTA ◽  
Nobuaki YAMAUCHI ◽  
Atsushi SATOU ◽  
Yuuki KAWAI ◽  
Toshiki KITAGAWA
Keyword(s):  
Noise Reduction ◽  
Railway Line ◽  
Sound Barriers ◽  
Reduction Effect

scholarly journals Research on Aerodynamic Noise Reduction for High-Speed Trains

2016 ◽  
Vol 2016 ◽  
pp. 1-21 ◽  
Author(s):  
Yadong Zhang ◽  
Jiye Zhang ◽  
Tian Li ◽  
Liang Zhang ◽  
Weihua Zhang
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Low Noise ◽  
Broadband Noise ◽  
Full Scale ◽  
Noise Model ◽  
Aerodynamic Noise ◽  
High Speed Train ◽  
Detached Eddy Simulation ◽  
Noise Sources

A broadband noise source model based on Lighthill’s acoustic theory was used to perform numerical simulations of the aerodynamic noise sources for a high-speed train. The near-field unsteady flow around a high-speed train was analysed based on a delayed detached-eddy simulation (DDES) using the finite volume method with high-order difference schemes. The far-field aerodynamic noise from a high-speed train was predicted using a computational fluid dynamics (CFD)/Ffowcs Williams-Hawkings (FW-H) acoustic analogy. An analysis of noise reduction methods based on the main noise sources was performed. An aerodynamic noise model for a full-scale high-speed train, including three coaches with six bogies, two inter-coach spacings, two windscreen wipers, and two pantographs, was established. Several low-noise design improvements for the high-speed train were identified, based primarily on the main noise sources; these improvements included the choice of the knuckle-downstream or knuckle-upstream pantograph orientation as well as different pantograph fairing structures, pantograph fairing installation positions, pantograph lifting configurations, inter-coach spacings, and bogie skirt boards. Based on the analysis, we designed a low-noise structure for a full-scale high-speed train with an average sound pressure level (SPL) 3.2 dB(A) lower than that of the original train. Thus, the noise reduction design goal was achieved. In addition, the accuracy of the aerodynamic noise calculation method was demonstrated via experimental wind tunnel tests.

Measures to Reduce the Lateral Vibration of the Tail Car in a High Speed Train

1996 ◽  
Vol 210 (2) ◽  
pp. 87-93 ◽  
Author(s):  
H Fujimoto ◽  
M Miyamoto
Keyword(s):  
Vibration Amplitude ◽  
High Speed ◽  
Vibration Mode ◽  
Simulation Analysis ◽  
Lateral Vibration ◽  
High Speed Train ◽  
Aerodynamic Forces ◽  
Vibration Data ◽  
Tunnel Section ◽  
Train Vibration

From the vibration data obtained simultaneously on several cars in the same Shinkansen train, it was observed that the vibration amplitude of the tail car is greater than those of the other cars in a train. The authors' analysis arrived at the conclusion that the vibration mode of a train has a tendency for the tail car to vibrate more than the others, when the carbody hunting characteristics of a train for the yawing mode are likely to emerge, and when aerodynamic forces work in a tunnel section. Referring to those results, by simulation analysis etc., it was found that two longitudinal dampers installed parallel between the car ends (Fig. 1) with their forces depending on the angular velocity between cars, are effective in decreasing the train vibration including the tail car's vibration. Then, the prototype of the longitudinal dampers between the cars for Shinkansen was designed by obtaining the proper damping coefficient through simulation. The effectiveness of the installed damper was verified when it was tested up to 310 km/h in the Shinkansen train.

Complex structured polymer concrete sleeper for rolling noise reduction of high-speed train system

2019 ◽  
Vol 223 ◽  
pp. 110944 ◽  
Author(s):  
Sangkeun Ahn ◽  
Semin Kwon ◽  
Yeon-Taek Hwang ◽  
Hyo-In Koh ◽  
Hak-Sung Kim ◽  
...  
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Polymer Concrete ◽  
High Speed Train ◽  
Rolling Noise ◽  
Train System
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