Про визначення кінетичної енергії комбінованих машинних агрегатів

Ярошенко, П. М.; Ярошенко, П. Н.; Yaroshenko, P.

Про визначення кінетичної енергії комбінованих машинних агрегатів

Ярошенко, П. М.; Ярошенко, П. Н.; Yaroshenko, P.

URI: http://repo.snau.edu.ua/handle/123456789/6418

Дата: 2017

Короткий опис(реферат):

В статті розглянуто питання визначення системи рівнянь, що описують кінетичну енергію комбінованого машинного агрегату під час його роботи. В статье рассмотрен вопрос определения системы уравнений, которые описывают кинетическую энергию комбинированного машинного агрегата во время его работы.

Суть розробки, основні результати:

A machine aggregate as mechanical system shows by itself connection of one or a few agricultural machines, transmission mechanism (coupling, hydrogacka) and power part (tractor). In this work as power part of machine tractor aggregate the wheeled arable-cultivated agricultural tractor that has a frame (basis) as a hard frame with transversal longerons is examined. On this frame all basic knots of tractor, including hanging systems (front and back), are mounted. Determination of kinetic energy of such aggregate is a task is difficult enough and requires knowledge of sizes of the masses and rates of movement of bodies that enter to him. At research of firmness and dirigibility of motion different after constructions and functional settings agricultural machine tractor aggregates can be presented as the united elementary kinematics links that assume possibility of the horizontal moving one in relation to other. Scientists (Аvdeev V. М., Аntoshenkov R.V, Аrtiymov N. P., Гjathev L. V., Лebedev A. Т., Roslavthev A. V. but other), that conducted research on firmness of motion of agricultural МТА multimass models used, as a rule, with many degrees of liberty. For the estimation of firmness of motion models were used with the corners of turn of aggregates in relation to each other and to the accepted axes of the generalized coordinates, or model with the variable coordinates of motion of aggregate. The analysis of motion of agricultural aggregates the dynamic models of that were given as two was conducted in the researches marked higher, three, four and five element models. The first assumption is acceptable to most tractors and agricultural machines. Their frames (or half-frame) show by itself hard enough constructions, deformations of that are small and does not influence on processes that is examined. The second assumption is acceptable to consideration of МТА in the process of direct implementation of technological operation, when the vibrations of speeds are insignificant. The third assumption consists in that at the calculation of firmness and dirigibility of motion the vertical moving of МТА is not examined. It assumption is just because in the task of researches the estimation of influence of elements of pendant is not included on firmness and dirigibility. Obviously, that at the decision of such circle of tasks it follows to specify a calculation chart, including for her large knots and aggregates as the separate masses and to take into account inequalities of underlayment. Fourth assumption talks that at the symmetric placing of agricultural machines on a tractor that has a self-locking differential, the unevenness of coupling properties will be compensated, but she takes place, as well as different forces of resistance of rolling, and that is why they must be taken into account in a mathematical model. Fifth assumption is acceptable to consideration of rectilineal motion of МТА, that has the hanging machines hardly coupled with a tractor. Sixth assumption is acceptable to consideration of firmness and dirigibility of motion of МТА, that executes a technological operation with the high degree of observance of technological admittances, when even insignificant oscillation of directing wheels will result in deviation from a rectilineal trajectory. It was found out as a result of mathematical design, that kinetic energy of the combined aggregate consists of kinetic energies of his constituents: forward motion of centre-of-mass seeder, kinetic energy of rotatory motion of centre-of-mass seeder, kinetic energies of forward and rotatory motion of centre-of-mass of tractor and centre-of-mass of cultivator.

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