TO DETERMINE THE MOVEMENT STABILITY OF A THREE-LINK TRAILER CONTAINER TRAIN

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In recent years, road trains for container transportation have become widely distributed. The efficiency of container transportation can be increased by using three-link road trains which capable to transported 2 containers, usually – one 20-foot, the second – 40-foot, or four-link road trains which capable to transported two 20-foot and one 40-foot container. In the case of using three-link road trains, the total mass G_ап of the thus road train increases to 60 tons, and of four-link road train – to 100 tons. The work considers a road train consisting of a towing vehicle and two trailers, one of which is three-axle with a front steered axle, and the second is two-axle with tandem-type axles. Based on the selected initial data for the towing vehicle and trailers, the critical speed of the straight-line movement of the road train was 31.75 m/s. In unstable modes, the stability of a road train can be judged by the magnitude of side and angular speed, as well as side acceleration, which are acting at the center of mass of individual links. Side and angular speed qualitatively characterize the stability of individual links of a road train, and the magnitude of side accelerations – quantitatively. When executing the “lane change” maneuver, the limiting factor in terms of stability is the second trailer, whose side and angular speed exceeds by 20% the side speed and by 12.5% the angular speed of the vehicle. When executing the “steering jerk” maneuver, the greatest acceleration occurs for the second trailer, and during the “turn entry” maneuver and with further circular motion, the greatest side accelerations take place for the towing vehicle, to wit it is not possible to obtain a unambiguous answer about the limiting factors for the links of the road train when execution the various maneuvers by him. In addition, when executing the «rearrangement» maneuver at a speed of 10 m/s, the road train fits into the normalized traffic corridor, but at a speed up to 15 m/s, oscillations are already observed that exceed the permissible ones, which indicate about a loss of stability of the road train movement. This must be taken into account when creating and operating multi-link road trains. Keywords: road train, trailer, trailer “dolly”, container, equation, speed, maneuver, acceleration, stability of motion.

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