Influence of the Damping System on the Vehicle Vibrations

Svoboda, Martin; Schmid, Václav; Sapieta, Milan; Jelen, Karel; Lopot, František

doi:10.21062/ujep/414.2019/a/1213-2489/mt/19/6/1034

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…This resistance depends primarily on the bending stiffness (resistance to the angular rotation of the wheelsets) and the shear stiffness of the bogies (resistance to the mutual lateral movement of the wheel sets). High shear stiffness provides stable movement on straight tacks, and low bending stiffness allows to negotiate curved track sections of the railway without flange guidance [22][23][24]. Finding the optimum combination of these characteristics will lead to a reduction in energy required to move rail vehicles on both straight and curved tracks [25].…”

Section: Introductionmentioning

confidence: 99%

Improving the energy efficiency of a tram’s running gear

et al. 2023

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This research analyses the influence of some design features of an undercarriage of a tram on the energy efficiency in terms of mechanical energy losses during its operation. The work includes the comparison of results of the research from two main points of view, namely from a running gear design and a railway wheel design. Two variants of a tram’s bogie are investigated. A standard bogie and a bogie with a system that allows a radial adjustment of the wheelsets in curves. Two designs of a railway wheel are compared, a wheel with the traditional construction scheme and a wheel with a perspective construction scheme. The values of mechanical energy losses due to slippage in the contact between the wheels and rails are analysed. These losses are obtained with reference to a specific route and the value of the average power dissipated. Moreover, an analysis of advantages and disadvantages of bogie designs has made it possible to consider the most appropriate bogie design in terms of ensuring the energy efficiency. In this case, the bogie design with the wheels with the perspective construction scheme can be considered as the optimal option.

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Section: Introductionmentioning

confidence: 99%

Improving the energy efficiency of a tram’s running gear

et al. 2023

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Multibody simulations in analyses of the vehicles’ dynamics

Dižo,

Blatnický,

Ishchuk

et al. 2023

Transportation Research Procedia

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Acoustic Characteristics of Composite Structures Used in Train

Juřička¹,

Fojtl²,

Rusnáková³

et al. 2020

Manufacturing Technology

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This paper presents a study focused on sandwich structures as well-known train construction materials that are composed of two thin and rigid face sheets and a thick, low-density core material. For trains, the wheel-rail interface is the main source of noise, and the wheel-rail roughness, especially in the presence of rail corrugation, is the main excitation source transmitted to the interior and area for passengers. The purpose of the study is to optimize the acoustic properties of a composite sandwich panel used for train floors and walls. Sound absorption coefficient (α), noise reduction coefficient (NRC) and Transmission loss (TL) evaluations have been implemented and experimentally validated on a typical sandwich material used for trains. The opportunity to use a different material can be concretely calculated and modified for critical frequency ranges. Sound transmission loss levels of the structural components as the floor and wall of the train body, which are required of producers and customers, were tested in acoustic laboratory and acoustic devices according to ASTM and ISO standards. It is demonstrated that, for honeycomb and cork sandwich panels, acoustic response is not sensitive to cell size. For foam core sandwich panels, it is observed that different compositions with thin layers are effective in the frequency range of 50-1000 Hz.

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Influence of the Damping System on the Vehicle Vibrations

Cited by 3 publications

References 5 publications

Improving the energy efficiency of a tram’s running gear

Improving the energy efficiency of a tram’s running gear

Multibody simulations in analyses of the vehicles’ dynamics

Acoustic Characteristics of Composite Structures Used in Train

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