Noise reduction in high-speed train gangways using fairings and side barriers

Noh, Hee-Min

doi:10.1177/1687814020946131

Cited by 5 publications

(4 citation statements)

References 23 publications

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“…The length of China’s high-speed railway and the speed of railway vehicles continue to grow, and some aerodynamics and wheel/rail wear are key scientific and technical problems (Jin, 2018; Wang et al, 2022). The internal noise of flow-induced vibration (Kim et al, 2020; Noh, 2020) and wheel–rail wear in high-speed operation (Chiello et al, 2022; Thompson and Jones, 2000) directly affect the riding quality of the train, which is an urgent problem to be solved in the development of high-speed trains.…”

Section: Introductionmentioning

confidence: 99%

Vibroacoustic response of a high-speed train extruded profile under fluid-induced vibration

Zhang

Tang

et al. 2022

Journal of Vibration and Control

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The wall pressure fluctuation caused by a turbulent boundary layer is an important source of noise and vibration in high-speed trains. Considering that railway vehicles are usually made of extruded profiles, a simple and reliable model is needed to predict the vibroacoustic characteristics of extruded profiles excited by a TBL in the early stages of design. A hybrid finite element and statistical energy analysis model is established for computing the vibroacoustic response of finite-sized panels excited by a TBL. In the hybrid model, the wall pressure fluctuation of the TBL is modelled in the wavenumber domain. The panels are modelled using FEs, and acoustic waves in the fluid space below the panels are modelled using SEA. The TBL wall pressure acting on the top surface of the panels is resolved into equivalent nodal forces with discretization of the structure using FEs, achieved by calculating the cross-spectrum matrix of the wall pressure in the spectral domain and using jinc functions with smooth boundary and symmetric properties as shape functions. The reciprocity between direct and reverberant fields couples the acoustic fields to the structure. Once the response of the hybrid model is determined, sound transmission through the panels can be calculated. By following the procedures outlined in this paper, the range of wall pressure model selection for TBL has extended and reduced computational time and provides a basis for the acoustic optimization design of extruded profiles.

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Section: Introductionmentioning

confidence: 99%

Vibroacoustic response of a high-speed train extruded profile under fluid-induced vibration

Zhang

Tang

et al. 2022

Journal of Vibration and Control

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“…12 Furthermore, it was confirmed that indoor noise can be significantly reduced when side barriers are installed at the bellows to minimize the inflow of vehicles. 13 However, research on improving noise performance by changing the structural body of the bellows of railway vehicles is insufficient.…”

Section: Introductionmentioning

confidence: 99%

Improvement of transmission loss of bellows through thickness improvement and structural modification

Noh

2021

Advances in Mechanical Engineering

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The bellows of the vehicle are vulnerable to noise because of the low transmission loss among the components. Therefore, in this study, we modified the thickness and the structure of the bellows to improve transmission loss. Based on the impedance tube test, the transmission loss of the silicon rubber specimen – the main material of the bellows – was analyzed; the results confirmed low transmission loss in the low-frequency region. An analysis of the natural vibration model of the simple model indicated that in the low-frequency region of the bellows, a number of vibrations occurred because of the vibration of the outer and inner components. Accordingly, to improve transmission loss, the improvement introduced by varying the thickness was analyzed, and the results confirmed that the noise performance improved by more than 3 dB for a thickness of 3.5 mm in the double-layer structure. In addition, the transmission loss improved in the low-frequency region after acoustic-structure coupling analysis was performed based on a simple model. To compare the actual performance between the existing and improved bellows, a noise comparison test was performed. The test results confirm that the existing noise reduction index improved by 3 dB from 30 to 33 dB when the thickness was increased to 3.5 mm; in the frequency domain, the highest noise performance was improved with an improvement of 5.6 dB at 160 Hz.

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Section: Introductionmentioning

confidence: 99%

“…Therefore, it was confirmed that the noise in the low-frequency region, which rapidly increases while passing through a tunnel, can be blocked by blocking the inflow of noise through the side barrier and pairing. 21 This study aims to reduce the low-frequency noise of a railway vehicle gangway. In particular, in this study, a new approach was adopted to improve the transmission loss in a specific frequency domain by using a multilayer resonance panel, which has not been previously applied to the bellows of railway vehicles.…”

Section: Introductionmentioning

confidence: 99%

Improvement of noise reduction performance in bellows using multilayer perforated panels

Noh

2021

Advances in Mechanical Engineering

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When the speed of a railway vehicle increases, the level of noise inside the vehicle inevitably increases as well, which is a major cause of discomfort to passengers. The most effective method is to improve the overall noise reduction performance of a vehicle. In particular, the gangway of the railway vehicle is made of silicone rubber; therefore, its noise reduction performance is inferior to that of other components of the vehicle. Thus, it is essential to improve the interior noise performance of railway vehicles. This study aims to reduce the noise in the low-frequency region of a railway vehicle gangway. It examines the applicability of the multi-layered resonance type panel, which has not been previously applied to the bellows in railway vehicles. In particular, the transmission loss was improved by changing the structure without filling the bellows with sound-absorbing material. First, a theoretical review of the noise reduction performance of a perforated multilayer structure was performed. Based on this, the major design parameters of the perforated multilayer structure that are effective in reducing noise in the low-frequency region of the bellows were derived. Through this, it was confirmed that in the multilayered structure, the hole diameter of 1 mm was effective in increasing the transmission loss in the low-frequency region, and the transmission loss was improved at 1% of the porosity. In addition, through a simple two-dimensional analysis model, it was confirmed that the transmission loss of the porous panel was improved at low frequencies of 100 to 400 Hz. Based on this result, a gangway with perforated multilayer structures was developed and tested. Through this verification test, it was confirmed that the noise performance of 9.2 dB was an improvement in the low frequency range of 100 Hz.

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Noise reduction in high-speed train gangways using fairings and side barriers

Cited by 5 publications

References 23 publications

Vibroacoustic response of a high-speed train extruded profile under fluid-induced vibration

Vibroacoustic response of a high-speed train extruded profile under fluid-induced vibration

Improvement of transmission loss of bellows through thickness improvement and structural modification

Improvement of noise reduction performance in bellows using multilayer perforated panels

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