Contribution analysis of interior noise and floor vibration in high-speed trains by operational transfer path analysis

Noh, Hee-Min

doi:10.1177/1687814017714986

Cited by 20 publications

(10 citation statements)

References 19 publications

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“…4,5 Therefore, a study was conducted to derive the cause of interior noise in railway vehicles based on their operational signals. 6 These studies confirmed that the main causes of indoor noise may vary depending on the driving environment. However, studies based on experiments have limitations regarding the design of mitigation measures because they do not suggest the mechanism that causes noise.…”

Section: Introductionmentioning

confidence: 53%

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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Section: Introductionmentioning

confidence: 53%

Improvement of noise reduction performance in bellows using multilayer perforated panels

Noh

2021

Advances in Mechanical Engineering

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“…OTPA is a signal processing method, which uses numerical calculation means to obtain the transfer functions between the input and output signals, to obtain the contribution of the excitation sources or transfer paths to the target point response [20][21][22][23] .…”

Section: Otpa Methods Theorymentioning

confidence: 99%

The Transfer Paths’ Contribution Analysis to Floor Vibration of Metro Vehicle

Peng

Nie

Cai-ying

2020

Preprint

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Noise control is one of key issues to improve the ride comfort of metro trains. To find out the excitation source and its transfer path is an important prerequisite for noise control. The sound source identification results found that the significant noise source in metro trains is the structural-borne sound radiated by floor vibration. Based on the OTPA method, this study presents a method considering the amplitude and phase of the excitation to analyze the contribution of the secondary suspension path to the floor vibration. The results show that the energy of the passenger room noise mainly concentrates on the frequency range of 300~800Hz, caused by floor vibration; in the frequency range of 300~800Hz, the vertical direction of the anti-rolling torsion bar area provides the maximum contribution to the floor vibration, followed by the longitudinal direction of the air spring area. On the basis of contribution analysis, a transfer path optimization scheme is proposed, which may provide reference for future metro trains noise control.

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“…Ström [24] studied the OTPA method as a reliable way to identify the noise source contribution via simulation, and applied it to the highspeed train at speed of 120 km/h below the frequency of 500 Hz, which results showed that the airborne noise contributes more in the high frequency bands, while the yaw dampers and traction rods contributed more in the structure-borne noise. Noh [25] applied the OTPA method on KTX high-speed train at the highest speed of 300 km/h, and analyzed the interior noise and vibration transfer paths and the contribution of the components of the train after all. Bouvet and Rissmann [26] studied the interior prediction model and found out that the structure-borne transmission dominates at lower frequencies (typically below 200-300 Hz).…”

Section: Introductionmentioning

confidence: 99%

An investigation into high-speed train interior noise with operational transfer path analysis method

Zhu

Deng

et al. 2021

Rail. Eng. Science

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Passengers' demands for riding comfort have been getting higher and higher as the high-speed railway develops. Scientific methods to analyze the interior noise of the high-speed train are needed and the operational transfer path analysis (OTPA) method provides a theoretical basis and guidance for the noise control of the train and overcomes the shortcomings of the traditional method, which has high test efficiency and can be carried out during the working state of the targeted machine. The OTPA model is established from the aspects of "path reference point-target point" and "sound source reference point-target point". As for the mechanism of the noise transmission path, an assumption is made that the direct sound propagation is ignored, and the symmetric sound source and the symmetric path are merged. Using the operational test data and the OTPA method, combined with the results of spherical array sound source identification, the path contribution and sound source contribution of the interior noise are analyzed, respectively, from aspects of the total value and spectrum. The results show that the OTPA conforms to the calculation results of the spherical array sound source identification. At low speed, the contribution of the floor path and the contribution of the bogie sources are dominant. When the speed is greater than 300 km/h, the contribution of the roof path is dominant. Moreover, for the carriage with a pantograph, the lifted pantograph is an obvious source. The noise from the exterior sources of the train transfer into the interior mainly through the form of structural excitation, and the contribution of air excitation is non-significant. Certain analyses of train parts provide guides for the interior noise control.

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Contribution analysis of interior noise and floor vibration in high-speed trains by operational transfer path analysis

Cited by 20 publications

References 19 publications

Improvement of noise reduction performance in bellows using multilayer perforated panels

Improvement of noise reduction performance in bellows using multilayer perforated panels

The Transfer Paths’ Contribution Analysis to Floor Vibration of Metro Vehicle

An investigation into high-speed train interior noise with operational transfer path analysis method

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