Theoretical Investigation of Selection (Calculation) of Design Parameters of Modular Draft Device in Aggregation of Semitrailers

Abstract

One of the directions for expanding the functional properties of modular draft devices (MDD) is their use with semitrailers (using a fifth-wheel coupling, installed on the technological module). The issue with this is due to their ability to create such a redistribution of the MDD operational mass along the semitrailer’s axles whereby the loss of control of the entire transport aggregate is possible. To solve this problem, regularities have been established to consider in choosing the design parameters of the MDD. It has been established by theoretical calculations that an increase in the angle of inclination of the central α, with negative values of the angle of inclination of the lower β links of the rear-mounted mechanism of the MDD’s power module (PM), leads to an increase in the vertical load of the wheels of its technological module. The transition of the longitudinal coordinate point of the semitrailer’s tractive resistance application from −0.30 m to +0.30 m, provided α > β, leads to an increase in the vertical load on the wheels of its technological module. Increasing the angles of inclination of the central and lower links of the rear linkage of the PM leads to an increase in the vertical load on the wheels of its front axle. An exception is the option in which the lower links of the specified linkage mechanism are set at a negative angle at the level of −10o. An increase in the value of the angle of inclination of the central value, with positive values of the angle of inclination of the lower links of the rear-mounted mechanism of the PM, and compliance with the condition α < β, leads to a decrease in the vertical load of the wheels of the technological module.

Development of Advanced Methodology of Experimental Research on Oscillation Processes Intensity for Machine-Tractor Units

“…Smoothness of agricultural units movement is one of the important operational indicators of their work, which is assessed by the impact of oscillations (translational vertical, transverse, angular longitudinal, etc. ), mainly on the physical condition and health of the operators who operate them (Bulgakov et al, 2022;Hac et al, 2009;Szakács et al, 2010;Jazar, 2008). At the same time, there are other important indicators of machinetractor units, which depend on the smoothness of movement: traction and dynamic performance, productivity, agronomic qualities of the operation, traffic safety, durability and efficiency (Bulgakov et al, 2022).…”

“…), mainly on the physical condition and health of the operators who operate them (Bulgakov et al, 2022;Hac et al, 2009;Szakács et al, 2010;Jazar, 2008). At the same time, there are other important indicators of machinetractor units, which depend on the smoothness of movement: traction and dynamic performance, productivity, agronomic qualities of the operation, traffic safety, durability and efficiency (Bulgakov et al, 2022).…”

“…It is known from the theory on the tractor and the car (Bulgakov et al, 2022) that the main influence on the movement smoothness and driver's physiological state is exerted by two types of oscillations: translational vertical (jumping) and angular longitudinal (galloping). In turn, the movement smoothness depends on the microrelief of the surface, the skill of the driver, the layout of the unit, the type of running gear, speed, imbalance of parts, uneven rotation.…”

Study of the Turning Process of the Bridge Type Machines

“…The theory of movement and controllability of wheeled traction-transport machines is sufficiently studied (Nadykto V. et al, 2015;Bulgakov V. et al, 2022;Bulgakov V. et al, 2020;Ivanovs S. et al, 2020;Ivanovs S. et al, 2018;Bulgakov V. et al, 2016;Szakács T., 2010;Bulgakov V. et al, 2021;Fashutdinov M. et al, 2020;Panchenko, A., 2015). The operation of any wheeled machine takes place under conditions of a large number of disturbing factors (forces and their moments) that change the position of the machine in space and deviate its movement from the specified trajectory.…”

“…The steering of most modern wheeled machines is adapted to manual steering and is based on the kinematic or power steering principle (Nadykto V. et al, 2015;Bulgakov V. et al, 2022;Demšar I. et al, 2012;Bulgakov V. et al, 2020;Ivanovs S. et al, 2020;Ivanovs S. et al, 2018;Bulgakov V. et al, 2016;Bulgakov V. et al, 2021). Kinematic steering involves turning the steered wheels (front, rear or both front and rear) relative to the carcass or changing the position of one part of the mobile machine relative to the other in the horizontal plane (articulated frame).…”