MODELING THE MOTION OF HIGH-SPEED TRACKED VEHICLE WITH AUTOMATIC TRANSMISSION OF GEARS IN A PLANETARY BOX
Keywords:
planetary gearbox, sun, carrier, epicycle, friction, brake, gear shifting, acceleration timeAbstract
One of the most important indicators of the maneuverability of a high-speed tracked vehicle is the acceleration time to a certain speed. Many factors influence the acceleration time: specific power of the engine, adhesion properties of the soil, breakdown of gear ratios in the gearbox, qualification of the person driving the machine, and manual gear shifting, or the automatic gear shift algorithm if the machine is equipped with an automatic transmission. The object of research in this article is the modeling of the movement of a tracked vehicle during acceleration with gear shifting from the bottom up. A mathematical model is necessary for testing transmission control algorithms and optimizing with it a number of objective functions: minimum acceleration time, minimum slipping operation of control friction devices, maximum use of engine power, coupling properties of the soil, minimum fuel consumption. In various conditions, it is advisable to optimize the switching algorithm according to different criteria (from the above). A scientific novelty is the development of a mathematical model of the motion of a high-speed tracked vehicle in terms of describing the operation of friction control devices, brakes and friction clutches that fix certain basic links of planetary mechanisms that make up the gearbox of the vehicle under study. In particular, the moments transmitted by the clutches in the on state, after the end of slipping, are determined. This method was proposed by Berengard Yu.V. and successfully used by the authors for the mathematical description of not only friction, but also the brakes that stop the epicycles of the planetary mechanisms of first and second gears. New modeling capabilities are of interest: firstly, the structure of the mathematical model does not need to be changed in the stalled state and when it is on, and secondly, the model allowed us to correctly describe the friction clutch operation in case of moment overload - now it stalls and closes again after removing the external overload.References
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