DOI: https://doi.org/10.32515/2664-262X.2024.9(40).2.136-145

Research of braking dynamics of a road train

Pavlo Prohnii, Danylo Popovych, Olha Chorna, Ruslan Rozum, Mykola Buriak, Vitalii Biriuchynskyi, Mykhailo Bashutskyi

About the Authors

Pavlo Prohnii, Senior Lecturer, Western Ukrainian National University, Ternopil, Ukraine, e-mail: p.prohnii@wunu.edu.ua

Danylo Popovych, student of higher education, Ternopil National Medical University named after I.Ya. Gorbachevskii, Ternopil, Ukraine

Olha Chorna,, Associate Professor, PhD in Economics (Candidate of Economics Sciences), Western Ukrainian National University, Ternopil, Ukraine, e-mail: o.romanyshyn@wunu.edu.ua, ORCID ID: 0000-0002-4204-1551

Ruslan Rozum, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Western Ukrainian National University, Ternopil, Ukraine, e-mail: rozoom_ruslan@ukr.net, ORCID ID: 0000-0001-7812-8248

Mykola Buriak, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Western Ukrainian National University, Ternopil, Ukraine, е-mail : m.buriak@wunu.edu.ua, ORCID ID: 0000-0001-5332-1498

Vitalii Biriuchynskyi, рost-graduate, Western Ukrainian National University, Ternopil, Ukraine

Mykhailo Bashutskyi, рost-graduate, Western Ukrainian National University, Ternopil, Ukraine

Abstract

The article analyzes the dynamic characteristics of the braking process of a two-link road train during straight and curvilinear movement. It has been proven that the greatest indicator of the efficiency of the braking process of a road train is observed during full loading of all axles, that is, when all wheels are on the verge of blocking at the same time, and the stability of the movement of the road train in the braking mode depends on the proportionality of the braking forces to the value of the normal reactions on each wheel and the nature of the interaction of the links in the support-coupling device. Dependencies for calculating the value of the normal reactions acting on the wheels of the vehicle have been obtained. It was established that when the weight of the semi-trailer changes, the largest additional load occurs on the axle of the semi-trailer, the smallest - on the front axle of the tractor. During braking in the process of straight-line movement, with increased braking intensity, the load on the rear axle of the tractor, as well as the axles of the semi-trailer, is reduced by increasing the load on the front axle of the tractor. It should be noted that simultaneously with the unloading of the axles of the semi-trailer, there is an increase in the load on the support-coupling device of the vehicle, which, in turn, results in an increase in the load on the axles of the tractor. Braking dynamics of a road train in curvilinear movement shows that an increase in the intensity of braking is accompanied by a redistribution of the values of normal support reactions and additional loading of the front axle of the tractor. At the same time, a larger value of the normal reaction is characteristic of the wheels located on the outer circle relative to the center of rotation. This effect is explained by the influence of centrifugal forces. The maximum value of lateral deviation of normal support reactions is observed on the rear axle of the tractor.

Keywords

stability, braking, two-link road train, normal reactions of the bearing surface, straight-line motion, curved motion

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References

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Copyright (c) 2024 Pavlo Prohnii, Danylo Popovych, Olha Chorna, Ruslan Rozum, Mykola Buriak, Vitalii Biriuchynskyi, Mykhailo Bashutskyi