Determination of the Rolling Resistance Coefficient Under Different Traffic Conditions

Nunić, Zdravko; Ajanović, Mesud; Miletić, Dario; Lojić, Ranko

doi:10.22190/fume181116015n

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…While the tyre model of the trailer wheels has been very different in comparison with the tyre models of the vehicle, the tyre models of the front and rear wheels have differed only in having stiffness values and damping coefficients that are slightly different from each other, and this minute difference was caused by variations in the tyres' air pressure values. The friction coefficient has been set to the value of 0.75 for all tyre-road contacts [37][38][39][40].…”

Section: An Mbs Model Of a Vehicle-trailer Combinationmentioning

confidence: 99%

Investigation of Driving Stability of a Vehicle–Trailer Combination Depending on the Load’s Position Within the Trailer

Dižo

Blatnický

Dróździel

et al. 2023

Acta Mechanica Et Automatica

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Passenger cars are a means of transportation used widely for various purposes. The category that a vehicle belongs to is largely responsible for determining its size and storage capacity. There are situations when the capacity of a passenger vehicle is not sufficient. On the one hand, this insufficient capacity is related to a paucity in the space needed for stowing luggage. It is possible to mount a rooftop cargo carrier or a roof basket on the roof of a vehicle. If a vehicle is equipped with a towbar, a towbar cargo carrier can be used for improving its space capacity. These accessories, however, offer limited additional space, and the maximal load is determined by the maximal payload of the concerned vehicle. If, on the other hand, there is a requirement for transporting a load with a mass or dimensions that are greater than what could be supported using these accessories, then, provided the vehicle is equipped with a towbar, a trailer represents an elegant solution for such demanding requirements. A standard flat trailer allows the transportation of goods of various characters, such as goods on pallets, bulk material, etc. However, the towing of a trailer changes the distribution of the loads, together with changes of loads of individual axes of the vehicle–trailer axles. The distribution of the loads is one of the key factors affecting the driving properties of a vehicle–trailer combination in terms of driving stability, which is mainly a function of the distribution of the load on the trailer. This research introduces a study into how the distribution of the load on a trailer influences the driving stability of a vehicle–trailer combination. The research activities are based on simulation computations performed in a commercial multibody software. While the results presented in the article are reached for a particular vehicle–trailer combination as well as for a particular set of driving conditions, the applicability of the findings can also be extended more generally to the impact that the load distributions corresponding to various vehicle–trailer combinations have on the related parameters and other driving properties.

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Section: An Mbs Model Of a Vehicle-trailer Combinationmentioning

confidence: 99%

Investigation of Driving Stability of a Vehicle–Trailer Combination Depending on the Load’s Position Within the Trailer

Dižo

Blatnický

Dróździel

et al. 2023

Acta Mechanica Et Automatica

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“…Components of the main movement resistance are resistances due to friction in bearings [57][58][59] , the friction of rolling and sliding of wheels on rails, the dissipation of energy to a track and into the environment, and aerodynamic resistance.…”

Section: The State Of the Art Of Railway Vehicles Equipped With Indep...mentioning

confidence: 99%

Kinematic running resistance of an urban rail vehicle undercarriage: a study of the impact of wheel design

Semenov

Mikhailov

Kovtanets

et al. 2023

Sci Rep

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Urban railway vehicles are important means of transport in towns and cities due to their high capacity, power source, and low running resistance, which make them efficient for operation. Although these properties are considered advantages, there is still room for improvement in their operational efficiency. The main objective of this article is to investigate the impact of railway wheel design on the level of kinematic running resistance, which is expressed as the amount of mechanical energy losses during the interaction of wheels with rails. This research focuses on simulation computations of two variants of wheel design schemes: the traditional design scheme (TKS) and a perspective design scheme (PKS) characterized by a rotating flange independently of the wheel tread surface. Two undercarriage multibody models have been created, one with TKS and one with PKS, and simulation computations have been performed for running speeds of 10 km/h, 20 km/h, 30 km/h, and 40 km/h on track models in curves with radii of 20, 50, 100, 150, 200, and 250 m. The evaluated indicators affecting the level of mechanical energy losses were creep forces, slip velocities, and average power. The most important findings of this study are that the PKS design scheme resulted in lower values of all assessed parameters.

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“…According to [13], energy efficiency can be understood as the comparative ability to use less energy for the same level of energy supply for technological processes [14][15][16].…”

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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Determination of the Rolling Resistance Coefficient Under Different Traffic Conditions

Cited by 5 publications

References 11 publications

Investigation of Driving Stability of a Vehicle–Trailer Combination Depending on the Load’s Position Within the Trailer

Investigation of Driving Stability of a Vehicle–Trailer Combination Depending on the Load’s Position Within the Trailer

Kinematic running resistance of an urban rail vehicle undercarriage: a study of the impact of wheel design

Improving the energy efficiency of a tram’s running gear

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