Aeroacoustic Optimization Design of the Middle and Upper Part of Pantograph

Guo, Jun; Tan, Xiao-ming; Yang, Zhigang; Yang, Xue; Shen, Yanan; Wang, Haowei

doi:10.3390/app12178704

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…Kurita et al [9] developed more effective shape of noise insulation plates to design low-noise pantographs, of which the noise level can be diminished by more than 2 dB. Recently, Guo et al [10] studied three aerodynamic noise reduction measures of opening, slotting, and airfoil. The results show that the open arms and the airfoil bow head can reduce the aerodynamic noise to over 1.0 dBA.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Aerodynamic Noise Reduction of Pantograph

Shi

Tian

et al. 2022

Applied Sciences

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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 aerodynamic noise of a Faiveley CX-PG pantograph. Considering that China’s Fuxing bullet trains operate at 350 km/h, the inflow velocity of 350 km/h is applied in this paper. The noise radiated from the panhead area, middle area, and bottom area at an inflow velocity of 350 km/h is distinguished. The noise intensities at the standard observer show that the noise radiated from the panhead area is the strongest, and the sound pressure level spectrum value is larger than the other two in the range above 500 Hz. The influence of applying the wavy rods and modifying the contact strip shape on the aerodynamic noise is discussed in detail. By comparing the acoustic source distribution and the far-field noise intensity, it is found that applying the wavy rods can effectively reduce the panhead noise, especially around the peak frequency. Modifying the shape of the contact strip to a hexagon can suppress the vortex shedding, leading to a lower surface pressure level. Combining the strip modification and wavy rods, the total noise intensity can be diminished by about 3.0 dB.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on Aerodynamic Noise Reduction of Pantograph

Shi

Tian

et al. 2022

Applied Sciences

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“…Therefore, shape optimization of the pantograph has attracted much attention. In [5], a noise reduction approach for the pantograph's shape was proposed that uses an open upper and lower arm rod and an airfoil-shaped bow head structure. The airfoil bow head reduces the vorticity intensity and vortex structure scale size, thus reducing the intensity of the radiated noise by about 1.2 dBA.…”

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confidence: 99%

Special Issue on Aerodynamic Noise Research of High-Speed Trains

Sun

Wang

2023

Applied Sciences

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Aerodynamic drag and noise reduction of a pantograph of high-speed trains with a novel cavity structure

Qin,

Li,

Zhou

et al. 2024

Physics of Fluids

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The design of the cavity structure is one of the effective means to reduce the resistance and noise of the pantograph installed on the roof of a high-speed train. This research first investigated the flow and acoustic characteristics of a pantograph with four different cavity structures, namely the rectangular cavity (original), the rounded edge cavity (case 1), and the other two rounded edge cavities with asymmetric (case 2) and symmetric (case 3) connecting tubes. The results show that the three cavity treatment methods all improve the aerodynamic performance, and the cavity model of case 2 is determined to be the optimal structure. In case 2, the tube installed at the front of the cavity destroys the separated shear layer and reduces the unstable airflow, reducing cavity resistance and noise by 9.64% and 5.2 dBA (A-weighted decibels), respectively. The pantograph is placed inside the previously determined improved cavity, which reduces the airflow velocity and the recirculation region upstream of the pantograph, decreases the impingement on the components in the middle and lower regions of the pantograph and the generation of highly intense vortices, and improves the wake structure and flow separation at the rear surface of the cavity. Thus, the aerodynamic drag for the pantograph and the whole system is reduced by 3.82% and 3.25%, respectively, and the aerodynamic noise is also decreased by 1.4 and 1.9 dBA, respectively. This study provides a novel structural design for the pantograph cavity region.

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Aeroacoustic Optimization Design of the Middle and Upper Part of Pantograph

Cited by 5 publications

References 15 publications

Numerical Study on Aerodynamic Noise Reduction of Pantograph

Numerical Study on Aerodynamic Noise Reduction of Pantograph

Special Issue on Aerodynamic Noise Research of High-Speed Trains

Aerodynamic drag and noise reduction of a pantograph of high-speed trains with a novel cavity structure

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