On the Critical Points of Vertical Vibration in a Railway Vehicle

Dumitriu, Mădălina

doi:10.2478/meceng-2014-0035

Cited by 25 publications

(20 citation statements)

References 6 publications

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“…The results derived from such models prove that the critical positions in terms of ride comfort are found at the ends of the carbody. This fact does not always reflect in reality, since there are situations in which the level of vibrations at the carbody centre is comparable with the level recorded at its ends [4,8].…”

Section: Introductionmentioning

confidence: 98%

“…Such a model was used by Zhou et al [5] to investigate the influences of the carbody vertical flexibility on the ride quality in the passenger railway vehicles. Dumitriu [8] studied the position of the carbody critical point in terms of the ride comfort. Tomioka and Takigami [9] employed the model of Euler-Bernoulli elastic beam for presenting a theory based on the use of the longitudinal vibration in bogies as a dynamic vibration absorber (DVA) to reduce the vertical bending vibration of railway vehicle carbodies.…”

Section: Models Of 'Flexible Carbody' Typementioning

confidence: 99%

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Modelling of structural flexibility of the railway vehicles carbody

Dumitriu

Crăciun

2017

MATEC Web Conf.

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Abstract. The accuracy in the models of railway vehicles in the ride comfort evaluation mainly derives from the modelling of the carbody structural flexibility. The former part of the paper herein reviews the 'flexible carbody' type methods used to represent the carbody structural flexibility in the approaches targeting the identification of certain methods to reduce the flexible vibrations in the carbody so as to improve the ride comfort of the railway vehicles. What seems to apply are the simple beam models such as Euler -Bernoulli or Timoshenko, structure type models and detailed multi-body, finite-element models or combinations of multi-body and finite-elements models. The latter part will feature a contrastive analysis regarding the comfort index coming from the numerical simulations based on 'rigid carbody' and 'flexible carbody' original models. It is highlighted that the comfort performance of a railway vehicle evaluated on the basis of a 'rigid carbody' mode is overrated.

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Section: Introductionmentioning

confidence: 98%

Section: Models Of 'Flexible Carbody' Typementioning

confidence: 99%

Modelling of structural flexibility of the railway vehicles carbody

Dumitriu

Crăciun

2017

MATEC Web Conf.

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“…where 6 = z e and p 7 = θ e ; P k stand for the amplitudes corresponding to the motions of the vehicle suspended masses; ϕ k is the phase of coordinate k in respect to the track vertical irregularities against the vehicle centre.…”

Section: The Frequency Response Functions Of the Vehiclementioning

confidence: 99%

“…The lighter the carbody, the higher its flexibility, which enables an easier excitation of the carbody structural vibrations [3,4], while modifying the dynamic behaviour of the vehicle [5,6]. Even though the carbody structural vibrations are quite complex [7,8], the largest influence on the vertical vibration regime of the vehicle is exerted by the carbody natural bending mode, with its natural frequency within the range between 7 and 12 [Hz] [9], namely in an area where the human body is sensitive to vibrations [10,11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Suspended Equipment on the Carbody Vertical Vibration Behaviour of High-Speed Railway Vehicles

Dumitriu¹

2016

Archive of Mechanical Engineering

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The equipment mounted on the carbody chassis of the railway vehicles is a critical component of the vehicle in terms of ride comfort. The reason for that is their large mass, able to visibly influence the vibrations mode of the carbody. The paper examines the influence of the equipment upon the mode of vertical vibrations of the carbody in the high-speed vehicles, reached on the basis of the frequency response functions of the acceleration in three carbody reference points -at the centre and above the bogies. These functions are derived from the numerical simulations developed on a rigid-flexible coupled model, with seven degrees of freedom. As a rule, the results herein prove the influence of the equipment mounting mode (rigid or elastic), along with the speed regime, upon the level of vibrations in the carbody reference points, at the resonance frequency of the symmetrical bending mode. Similarly, it is also demonstrated how the equipment mass and the damping degree of the suspension system affect the level of the vibrations in the carbody.

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“…

。研究高速列车车下设备对车辆的动力学性能的影响一直是国内外学者关注的重点。宫岛等 [7][8] 建立了单设备的车辆-设备耦合模型，分析了设备悬挂参数对车辆垂向振动特性的影响； DUMITRIU [9][10][11] 建立了无设备的车辆多自由度模型，获得了车辆系

…”

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