Investigation of Tramway Line No. 1, in Budapest, Based on Dynamic Measurements

Jóvér, Vivien; Gáspár, László; Fischer, Szabolcs

doi:10.12700/aph.19.3.2022.3.6

Cited by 12 publications

(7 citation statements)

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“…The through-rolled axle tonnage is the mass of all crossing vehicles on a given line in one direction in one year. It is determined by multiplying the total number of crossing vehicles on the line and the average of the T0 loading (serviceable vehicle without crew and passenger) and T3 loading (serviceable vehicle with staff and maximum passenger capacity) [71][72][73][74][75]. Based on these, four traffic load classes can be differentiated (Table 1).…”

Section: Traffic Load and Agementioning

confidence: 99%

“…The TrackScan 4.01 instrument is applied to measure the geometrical characteristics of tramway tracks (Figure 9). This instrument has been developed by the Hungarian company called Metalelektro Méréstechnika Ltd. [73][74][75]. This instrument is a complex track-measuring device that records the parameters every 25 centimeters and is suitable for continuous measurement of railway and tramway tracks.…”

Section: Geometrical Measurements and Examined Parametersmentioning

confidence: 99%

“…This instrument is a complex track-measuring device that records the parameters every 25 centimeters and is suitable for continuous measurement of railway and tramway tracks. It can measure and record the following characteristics at the same time [73][74][75] Based on the measured and recorded characteristics, the examined parameters of tracks are the following:…”

Section: Geometrical Measurements and Examined Parametersmentioning

confidence: 99%

“…• track gauge: the distance between the two rails of the track, measured at a given height of the head of the rails between the inner guiding surface perpendicularly in the axis of the track, in the radial direction in the case of a curved track [71,73,75]; • alignment: shows the horizontal deviations of rails, its base length is 1350 millimeters, and it is symmetrical [71,73,75]; • longitudinal level: shows the vertical deviations of rails from the ideal, the base length of measurement is 1510 millimeters, and it also uses a symmetrical basis [71,73,75].…”

Section: Geometrical Measurements and Examined Parametersmentioning

confidence: 99%

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Investigation of “Open” Superstructure Tramway Tracks in Budapest

et al. 2023

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The most important thing nowadays is to use available resources to develop infrastructure as efficiently as possible. In this regard, evaluating the deterioration of tramway tracks is critical from both a technical and an economic viewpoint. In Hungary, seven types of superstructure systems are currently differentiated in the case of tramway transport, but the geometrical deterioration, lifecycle, and lifecycle cost of the tramway tracks are not accurately known. The current study aimed to evaluate and compare the results of track geometry measurements of two different “open” tramway superstructure systems depending on their traffic load and age. The geometry measurements we re executed by TrackScan 4.01 instrument, developed and maintained by a Hungarian developer company called Metalelektro Méréstechnika Ltd. The evaluation of the measurements showed a clear relationship between the traffic load, age, and track deterioration. Based on the results, it can be generally stated, concerning “open” superstructure systems, that regardless of the “open” superstructure system or the level of traffic load, the average value of alignment is decreasing; however, the average value of the longitudinal level is increasing. Furthermore, the deterioration of an older ballasted track with lower traffic is similar to that of a younger ballasted track that has a higher traffic load. Another significant result was that the deterioration of the track gauge parameter in the case of concrete slab tracks is clearly described as the broadening of the track gauge.

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Section: Traffic Load and Agementioning

confidence: 99%

Section: Geometrical Measurements and Examined Parametersmentioning

confidence: 99%

Section: Geometrical Measurements and Examined Parametersmentioning

confidence: 99%

Section: Geometrical Measurements and Examined Parametersmentioning

confidence: 99%

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Investigation of “Open” Superstructure Tramway Tracks in Budapest

et al. 2023

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“…It should also be noted that the latest development of infor mation technologies and artificial intelligence allows the use of innovative tools to solve both classic and modern transport problems and tasks. Some of the most popular techniques used by scientists include: agentbased modeling and goal program ming [22,23]; a hybrid system for strategic planning, which integrates mathematical models with knowledge principles [9]; covariance analysis, discrete choice and latent class analysis [17,19]; tabu search heuristics [11]; deep and machine learning [8,[14][15][16]; mechanisms of fuzzy logic and simulated anneal ing [12]; methods based on the data of navigation services [21]; exploratory factor analysis [5]; innovative combination of intu itionistic fuzzy numbers with graphtheoretic and matrix ap proach [6]; models of commoditybased freight demand based on exogenous economic forecasts [24] and economics of trans action costs [8]; the theory of time windows [7], dynamic mea surements [25], digital image correlation method [26] and the Bayesian approach for model estimation [27,28].…”

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confidence: 99%

Shaping sustainable strategies of freight forwarding companies in the environment of the road transport market

Naumov,

Umarova,

Taran

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. The paper aims to propose an approach to shape the sustainable strategies of freight forwarders under uncertainty of the stochastic environment of the transportation market. Methodology. The elements of the game theory were used to formalize the conflict situation, where the uncertainty of the transport market is considered as a game with nature. To design the model of the freight transportation market, the principles of the system’s theory were used in the representation of a forwarding company operating as an element within the macro-logistic system of the transport market. The methods of object-oriented programming were applied to develop the dedicated software for computer simulations of the forwarder’s operation within the market of transport services. The regression analysis was used as the main methodology to process the numeric results of experimental studies. The elements of functional analysis were applied to substantiate the sustainable strategy of a forwarding company in the considered example. Findings. The results of the conducted experiment allowed for determining the high-quality dependencies between the number of serviced requests and the number of dispatchers involved in the requests’ servicing for the case when the operators’ decisions are supported by the specialized software and for the case when decisions are made conventionally. Originality. The use of a game-theoretical approach in this study is based on the advanced simulations of a freight servicing process where the demand randomness and the servicing process stochasticity are integrally considered. Practical value. The proposed methodological approach is proposed to be used by forwarding companies to evaluate sustainable strategies when servicing clients within the given market. The use of the developed approach in practice allows forwarders to decrease the operational costs achieving the minimal negative impact on the environment.

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Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

Sysyn

Gerber

Liu

et al. 2022

Transp. Infrastruct. Geotech.

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During track construction or ballast bed maintenance, ballast layer compaction quality plays an essential role in the following track irregularity accumulation, its lifecycle, and maintenance costs. The ballast compaction process is characterized by its compaction and the accumulation of the stressed state. The elastic wave propagation methods are an effective way for the identification of the ballast bed compaction properties. The paper presents the theoretical and experimental studies of the ballast consolidation under the vibration loading of the sleeper. The practical laboratory study is given by the 1:2.5 scaled physical model of one sleeper and the corresponding ballast layer box. The measurements of ballast pressure and deformations under the vibration loading in the ballast layer and the photogrammetric recording of the ballast flow are carried out. The measurements demonstrate the accumulation of the residual stresses under the ballast layer. Furthermore, the measurements of elastic wave time of flight (ToF) using the shakers under the sleeper and acceleration sensors under the ballast show the substantial increase of the ToF velocities after the tamping process. Moreover, the distribution of the velocities along the sleeper is spatially inhomogeneous. The numeric simulation using the discrete element method (DEM) of the tamping and the testing processes proves the inhomogeneous wave propagation effect. The modeling shows that the main reason for the wave propagation inhomogeneity is the accumulated residual stress distribution and the minor one – the compaction density. Additionally, a method for identifying wave velocity spatial distribution is developed by wave tracing the inhomogeneous medium. The procedures allow ballast identification in the zones outside the shakers.

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Investigation of Tramway Line No. 1, in Budapest, Based on Dynamic Measurements

Cited by 12 publications

References 0 publications

Investigation of “Open” Superstructure Tramway Tracks in Budapest

Investigation of “Open” Superstructure Tramway Tracks in Budapest

Shaping sustainable strategies of freight forwarding companies in the environment of the road transport market

Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

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