© Viktor Poljakov, Candidate of Technical Sciences, associate professor, professor of Automobiles Department, ORCID: 0000-0001-7042-3066, e-mail: poljakov_2006@ukr.net;
© Denys Popelych, Postgraduate Student of Automobiles Department, ORCID: 0000-0001-9506-6421, e-mail: popelish@ukr.net;
© Volodymyr Sakhno, Doctor of Technical Sciences, Professor, Head of Automobiles Department, ORCID: 0000-0002-5144-7131, e-mail: sakhno@ntu.edu.ua;
© Galyna Filipova, Candidate of Technical Sciences, Associate Professor, Professor, Automobiles Department, ORCID: 0000-0003-3427-7633, e-mail: galina_gaj@ukr.net;
© Svitlana Sharai, Candidate of Technical Sciences, Associate Professor, Professor, Department of International Transport and Customs Control, ORCID: 0000-0001-6568-4990, e-mail: svetasharai@gmail.com
National Transport University
To the comparative evaluation of three-link buses of different compound schemes for traffic stability
DOI: 10.33868/0365-8392-2022-2-270-2-10
Abstract. The article develops a mathematical model describing the movement of a three-link articulated bus (two-axle bus and two single-axle trailers), further ТAВ, as a four-mass system, taking into account the control wheel module of the bus. The system allows to study the influence of the design parameters of the bus and trailers on the stability of the ТAВ.
The object of the study is the stability of the articulated bus with drive either on the axle of the bus or on the axle of the first trailer.
The purpose of the work is a comparative evaluation of articulated buses with drive either on the bus axle or on the axle of the trailer in terms of stability.
Research methods – mathematical modeling of the stability of the movement of a three-link articulated bus (two-axle bus and two uniaxial trailers) with drive either on the bus axle or on the axle of the first trailer.
As a result of the study, it was found that at the selected values of the design parameters of the ТAВ, the critical speed when applying traction to the bus axis was 31.19 m / s, which exceeds the maximum speed of its movement.
When implementing traction on the axis of the trailer, the loss of stability of circular stationary modes is realized at values of 0.08 <alpha <0.09 (alpha – coefficient determining the share of normal reaction of the bearing surface on the wheels of the bus or trailer driving wheels), and the loss of stability of rectilinear motion – at alpha = 0,0815. The critical velocity in this case is vkp = 12.34 m / s.
Analysis of the conditions of static stability of the ТAВ during the implementation of traction on the axis of the trailer showed that the value of the drag coefficient does not affect the critical speed (not included in the expression of critical speed), and the value of rolling resistance coefficients on the first and second axles slightly affects the critical speed . and a critical value of the alpha parameter that determines the amount of traction. At the same time, even with optimally selected stiffness and layout parameters, the critical speed of articulated buses does not exceed 12.5 m / s, that is, such buses need a special system of opposition.
Keywords: articulated bus, stability, critical speed, traction force, driving mode, trailer, support surface reaction.
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