Abstract
Introduction. Improving the efficiency of agricultural operations and off-road logistics require new highly efficient non-road machinery with low pressure on road surface. The versatility of the use of this machinery imposes additional requirements on its design, including those related to road traffic safety on public roads. Changes in brake design are required to ensure safe braking performance when larger diameter wheels are used for the reason that to produce standard braking force according to the technical regulations for the safety of wheeled vehicles, requires more braking torque when using larger diameter wheels. Materials and Methods. The article proposes a model for calculating the braking parameters of transport and technological agricultural machines equipped with ultra-low pressure wheels. The model differs from those used earlier in that its output parameter is not the braking efficiency, but the time difference between the front and rear axle locks. Results. Fulfilling the condition of the front axle advance locking ensures the stability of the tractor motion during emergency braking that has a positive effect on road traffic safety. The results of the study suggest that to ensure the safe motion of the machines equipped with ultra-low pressure tires on public roads, it is necessary that the ratio of the distance from the center of mass to the front axle is at least not less than the distance from the center of mass to the road surface. Discussion and Conclusion. The proposed mathematical model has shown its adequacy. The obtained mathematical dependencies allow us to justify different technical solutions for ensuring safe road movement of transport and technological agricultural machines equipped with ultra-low pressure tires. Thus, the maximum permissible height of the center of mass can be assumed to be equal to 90% of the distance from the location of the center of mass of an agricultural transport and technological machine to its front (controlled) axis.
Highlights
Improving the efficiency of agricultural operations and off-road logistics require new highly efficient non-road machinery with low pressure on road surface
Changes in brake design are required to ensure safe braking performance when larger diameter wheels are used for the reason that to produce standard braking force according to the technical regulations for the safety of wheeled vehicles, requires more braking torque when using larger diameter wheels
The article proposes a model for calculating the braking parameters of transport and technological agricultural machines equipped with ultra-low pressure wheels
Summary
В статье предложена модель расчета параметров торможения транспортно-технологических машин сельскохозяйственного назначения, оснащенных колесами сверхнизкого давления. Выполнение условия опережающей блокировки передней оси обеспечивает устойчивость движения трактора при экстренном торможении, что положительным образом сказывается на безопасности дорожного движения. Полученные результаты позволяют утверждать, что для обеспечения безопасности движения данной техники, оснащенной шинами сверхнизкого давления по дорогам общего пользования, необходимо, чтобы соотношение расстояния от центра масс до передней оси было как минимум не меньше, чем расстояние от центра масс до опорной поверхности движения. Полученные зависимости позволяют обосновать разные технические решения для обеспечения безопасности дорожного движения транспортно-технологических машин сельскохозяйственного назначения, оснащенных шинами сверхнизкого давления. Предельно допустимая величина высоты центра масс может быть принята равной 90 % от расстояния от расположения центра масс транспортно-технологической машины сельскохозяйственного назначения до его передней (управляемой) оси. Контент доступен по лицензии Creative Commons Attribution 4.0 License.
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