Numerical Simulation of Aerodynamic Noise Generated by High Speed Trains

Sun, Zhenxu; Song, Jiakun; An, Yiran

doi:10.1080/19942060.2012.11015412

Cited by 20 publications

(20 citation statements)

References 20 publications

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“…It is worth mentioned that the inter-spacing between adjacent carriages is also an important noise source. However, the study of this kind of noise sources has been investigated in details in literature (Sun et al, 2012). As a result, it will not be discussed in the present paper.…”

Section: Computational Model Mesh and Conditionsmentioning

confidence: 95%

“…For example, considering intensive turbulence exists in the wake zone, finer mesh should be used compared to adjacent zones. The mesh configuration of current model is the same as the previous model in Sun et al (2012), with its y-plus around walls locating in a range of 30-100. As a result, the accuracy of the steady calculation of the flow field and the transient calculation of the aerodynamic noise could both be ensured, since the NLAS approach has the least requirement for mesh resolution (Batten et al, 2004).…”

Section: Computational Model Mesh and Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Identification and Suppression of Noise Sources Around High Speed Trains

Sun¹,

Guo²,

Yao³

et al. 2013

Engineering Applications of Computational Fluid Mechanics

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Aerodynamic noise would become a significant limiting factor as the running speed of high speed trains increases, and should be taken into consideration during the design of high speed trains. In the present work, the Nonlinear Acoustics Solver (NLAS) has been adopted to investigate the aerodynamic noise of high speed trains. The region around the streamlined head of the leading car and the trailing car, the bogie region, the upstream zone and the wake zone are discussed and the distribution characteristics of aerodynamic noise sources around a high speed train is exhibited. The acoustic characteristics of the streamlined head could be contaminated due to the unreasonable arrangement of cab windows or cowcatchers. As a result, different designs of cab windows and cowcatchers are investigated in this paper and advice on low noise design is given. Based on the above analysis, a new design of the streamlined head is proposed. Numerical results reveal that the noise level of the new streamline has been greatly suppressed. The analysis would aid in identification of noise sources around high speed trains and design of high speed trains with low noise.

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Section: Computational Model Mesh and Conditionsmentioning

confidence: 95%

Section: Computational Model Mesh and Conditionsmentioning

confidence: 99%

Identification and Suppression of Noise Sources Around High Speed Trains

Sun¹,

Guo²,

Yao³

et al. 2013

Engineering Applications of Computational Fluid Mechanics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, bogie at the first end of head train was the main aerodynamic noise source of the whole train compared with other bogies. Researches showed that the aerodynamic noise of high-speed trains was mainly determined by the fluctuating pressure of body surface [13]. Therefore, it was necessary to analyze the change rule of fluctuating pressure at the surface of train body.…”

Section: Meshes Of the High Speed Trainmentioning

confidence: 99%

“…Zhang [12] built an aerodynamic model including head train, middle train and tail train, computed the near-field and far-field aerodynamic noise of high-speed trains and only took into account noise sources at the surface of body instead of bogies and pantograph. Sun [13] established the aerodynamic model of 3-train formation, conducted an analysis on the flow field characteristics of train head, junction and tail, and studied the contribution of different parts of body to aerodynamic noises. Bogies and pantograph were not considered in the model.…”

Section: Introductionmentioning

confidence: 99%

Research on the distribution of aerodynamic noises of high-speed trains

Lu¹,

Wang²,

Zhang³

2017

J. vibroeng.

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This paper established a computational model for the aerodynamic noise of a high-speed train with 3-train formation including 3 bodies, 6 bogies, 2 windshields and 1 pantograph system. Based on Lighthill acoustic theory, this paper adopted large eddy simulation (LES) and FW-H model to conduct numerical simulation for the aerodynamic noise of high-speed trains and analyzed the distribution of aerodynamic flow behavior and noises of the whole train. Researched results showed that the main aerodynamic noise sources of high-speed trains were in pantograph, pantograph region, streamlined region of head train, bogies, bogie region, windshield region, air conditioning and other regions. Pantograph head, junction of upper arm and lower arm, and chassis region were main aerodynamic noise sources of pantograph. Compared with other 5 bogies, bogie at the first end of head train was main aerodynamic noise source. In addition, vortex shedding and fluid separation were main reasons for the aerodynamic noise of high-speed trains. When the high-speed train ran at the speed of 300 km/h and 400 km/h, the main energy of the whole train focused on the range of 1000 Hz-4000 Hz. Aerodynamic noises were broadband noises in the analyzed frequency domain. At the longitudinal observation point which was 25 m away from the center line of track and 25 m away from the nose tip of head train, the total noise sound pressure level reached up to maximum values 96.5 dBA and 101.4 dBA, respectively. Compared with inflow, wake flow had a greater influence on the aerodynamic noise around high-speed trains. The main radiation direction of pantograph aerodynamic noises was the left and right sides of pantograph head. In addition, the main radiation energy of pantograph aerodynamic noises was in mid-high frequency. In the part of high frequency, pantograph head made the greatest contribution to aerodynamic noises in the far field.

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“…Over the past few years, this has led to extensive research in the analysis of the flow characteristics in many different scenarios. (Cheli et al 2010), , (Hemida and Baker 2010), or (Sun et al 2012) are only a short representation of all the references available in this field. Once the flow structures are pictured, it is possible to propose a geometric modification that can improve the aerodynamic performance of trains.…”

mentioning

confidence: 99%

Aerodynamic Optimization of the Nose Shape of a Train Using the Adjoint Method

Muñoz-Paniagua

Garcı́a²,

Crespo³

et al. 2015

JAFM

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The adjoint method is used in this paper for the aerodynamic optimization of the nose shape of a train. This method has been extensively applied in aircraft or ground vehicle aerodynamic optimization, but is still in progress in train aerodynamics. Here we consider this innovative optimization method and present its application to reduce the aerodynamic drag when the train is subjected to front wind. The objective of this paper is to demonstrate the effectiveness of the method, highlighting the requirements, limitations and capabilities of it. Furthermore, a significant reduction of the aerodynamic drag in a short number of solver calls is aimed as well. The independence of the computational cost with respect to the number of design variables that define the optimal candidate is stressed as the most interesting characteristic of the adjoint method. This behavior permits a more complete modification of the shape of the train nose because the number of design variables is not a constraint anymore. The information obtained from the sensitivity field permits determining the regions of the geometry where a small modification of the nose shape might introduce a larger improvement of the train performance. A good agreement between this information and the successive geometry modifications is observed here.

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Numerical Simulation of Aerodynamic Noise Generated by High Speed Trains

Cited by 20 publications

References 20 publications

Identification and Suppression of Noise Sources Around High Speed Trains

Identification and Suppression of Noise Sources Around High Speed Trains

Research on the distribution of aerodynamic noises of high-speed trains

Aerodynamic Optimization of the Nose Shape of a Train Using the Adjoint Method

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