Analysis of the near-field and far-field sound pressure generated by high-speed trains pantograph system

Zhao, Yue-ying; Yang, Zhigang; Li, Qiliang; Xia, Chao

doi:10.1016/j.apacoust.2020.107506

Cited by 26 publications

(5 citation statements)

References 18 publications

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“…To improve the computation efficiency, the subdomain method is used to obtain the flow field and aerodynamic noise, which has been applied in many pieces of research, such as the aerodynamic noise of pantograph. 32 In the present work, the subdomain is 30 m in length, 15 m in width and 10 m in height, respectively. The maximum operating speed of 350 km/h is chosen to investigate the importance of aerodynamic noise at higher speeds.…”

Section: Methodsmentioning

confidence: 99%

Noise contribution and coherence analysis of high-speed train head shape under moving slab track

Zhuo-ming

Yang

2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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Aerodynamic noise generated by 1:8 scale three carriages high-speed train was investigated by numerical simulation and wind tunnel test. The difference of far-field noise below 1600 Hz between simulation based on dense mesh and test is less than 3 dB(A), which indicates that the current simulation method has reasonable accuracy. It is found that dipole source can be used as the only sound source to calculate the far-field noise because its intensity is more significant than that of the quadrupole source. The subdomain method is applied to investigate the noise contribution and coherence analysis of full-scale head shape. It is found that the far-field noise contributions of the frame, bogie cavity and wheel set are significant, and the peak frequency occurs at the frequency of 630 Hz. Coherence analysis indicates that the far-field noise with the train body as the sound source has a relatively high correlation with the pressure pulsation caused by the vortex structure generated at the wiper housing and the bogie. Also, the side vortex near the front wheel has a higher correlation with the far-field noise at a higher frequency, while a stronger correlation between that near the rear wheel and the far-field noise occurs at a lower frequency.

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Section: Methodsmentioning

confidence: 99%

Noise contribution and coherence analysis of high-speed train head shape under moving slab track

Zhuo-ming

Yang

2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…17 Dai et al 18 designed two types of outer windshield and confirmed through simulation that the full-windshield form was able to lessen the overall SPL on the sides of near-field by about 13 dB. Zhao et al 19 carried out a test in a 1:15 model wind tunnel, discovering that the turbulent fluctuating pressure at inter-coach space could be significantly reduced and the vibration and noise reduction could be achieved by means of full windshield treatment or setting spoilers (spoiler balls, spoiler pillars) upstream of the inter-coach space. Similarly, Mizushima et al 20,21 also verified the effectiveness of two passive noise control methods based on wind tunnel tests: setting spoiler thin line upstream and rounding the downstream edge.…”

Section: Introductionmentioning

confidence: 94%

Numerical investigation into characteristics of far-field aerodynamic noise radiated by inter-coach space of high-speed maglev trains

Wang

Huang

2022

Noise & Vibration Worldwide

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Self-sustain oscillation leads to aerodynamic noise at inter-coach space. It can be seen from existing literature that the aerodynamic noise at inter-coach space has already become an important branch in the domain of vibration and noise reduction of high-speed wheel-rail trains. However, to the best of our knowledge, approaches focusing on the identical problem that does exist in the windshield area of high-speed maglev train have not yet been published. In this paper, a computational model is established for the inter-coach space of high-speed maglev train running at the speed of 600 km·h−1. The model includes two half-mid-train with one outer full windshield connected. On the basis of Realizable k-ε model and Spalart-Allmaras DDES model, respectively, the steady and unsteady flow field are initially solved, and the pressure fluctuation on rigid surfaces, the vortex shedding process and the distribution of sound source power are then visualized to make clear the genesis mechanism of aerodynamic noise in the windshield area. With penetrable integration surfaces constructed, the far-field sound radiation is obtained from the Ffowc Williams-Hawkings (FW-H) equation, and the contribution rate of the quadrupole noise sources to the total aerodynamic noise is then calculated as a comparison to the previous conclusions that aerodynamic noise at inter-coach space of high-speed trains was mainly dipole. Of great significance, it is concluded in this paper that at the speed of 600 km·h−1, the quadrupole sound source contributes about 35.6% to the total sound energy in the far field, which is lower than the percentage using the entire train model at the same speed level but still cannot be ignored. The results in this paper are able to provide guidance for future researches on vibration and noise reduction of high-speed maglev train.

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“…Thereby, LES with the wall-adapting local-eddy viscosity subgrid-scale model which has been validated by the fundamental flow cases is applied for the flow calculation to save computation resources and improve iteration convergence. Based on the mesh topologies of the carbody and pantograph of high-speed train, 7 the adaptive unstructured trim grids with a number of 1.2×10 8 are generated around the geometries after the mesh-refinement study has been performed. The mid-span mesh of the train nose car model is displayed in Figure 14.…”

Section: A Simplified High-speed Train Nose Car Modelmentioning

confidence: 99%

“…It was found that the flow-induced noise of the pantograph was narrow-band and its main energy was distributed in the frequency range of 100-700 Hz. Zhao et al 7 investigated the aerodynamic noise of high-speed train pantograph based on the Ffowcs Williams-Hawkings (FW-H) method and acoustic perturbation equation (APE) approach. For the contribution to the far-field radiated noise, the dipole source was dominated and the quadrupole source was negligible.…”

Section: Introductionmentioning

confidence: 99%

Investigation on aerodynamic noise generated from the simplified high-speed train leading cars

Zhu

et al. 2022

International Journal of Aeroacoustics

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The aerodynamic noise behavior of flow passing the simplified leading car and nose car scale models of a high-speed train is investigated through the vortex sound theory and acoustic analogy approach. The unsteady flow developed around the geometries is solved numerically and the data are applied to study the near-field quadrupole sound source and calculate the far-field noise radiated. It is found that the turbulent flow developed around the leading car is characterized by multi-scale vortices separated from the geometries. The intensity of volume dipole source is much larger than that of volume quadrupole source and the volume dipole source becomes the predominate source of the near-field quadrupole noise. The flow is separated noticeably in the regions of the nose, bogies, bogie cavities, and train tail of the leading car where the pressure fluctuations are generated largely upon the solid surfaces and correspondingly a dipole noise of high level is produced. By comparison, the noise contribution from the leading bogie and bogie cavity is larger than that from the other components. Moreover, the numerical and experimental results of train nose car model demonstrate that the flow around the bogie region is the dominant aerodynamic sound source. Therefore, the flow-induced noise generated from the leading cars may be reduced efficiently within a certain frequency range and specific direction by mitigating the flow interactions around the areas of leading bogie and bogie cavity.

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Analysis of the near-field and far-field sound pressure generated by high-speed trains pantograph system

Cited by 26 publications

References 18 publications

Noise contribution and coherence analysis of high-speed train head shape under moving slab track

Noise contribution and coherence analysis of high-speed train head shape under moving slab track

Numerical investigation into characteristics of far-field aerodynamic noise radiated by inter-coach space of high-speed maglev trains

Investigation on aerodynamic noise generated from the simplified high-speed train leading cars

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