Fuel Consumption of a Straddle Forestry Tractor in Consideration of Stochastic Factors
DOI:
https://doi.org/10.37482/0536-1036-2020-5-145-154Keywords:
straddle tractor, microprofile, fuel consumption, transfer function, optimizationAbstract
Currently, there is a tendency for creation a cross-functional tractor line of drawbar category. Everything is very practical and consistent from the perspective of the producer of such tractors. The number of modular units and assemblies is minimized, and the list of components is reduced. However, all this is acceptable up to a certain limit, which is outlined by the technological trail of the tractor being created and the specifics of its application. The article deals with a straddle forestry tractor of drawbar category of 6 kN. It is assumed that the tractor has a variety of trains of working bodies and machines, as well as a cargo bed on the pin-joint section. The cargo mode of the unitʼs movement is examined by a random microprofile under the wheels in tracks. The problem of statistical dynamics is solved. As an output process, a Laplace image is drawn for the hourly fuel consumption of the tractor engine. As an input process, a Laplace image is drawn for an external random action from the microprofile along the tracks. Herewith, the transfer function of the hourly fuel consumption is determined, which allows to estimate the spectral density of the tractor’s hourly consumption and the dispersion of the hourly consumption for the given microprofile of the tracks. In addition, using the correlation theory of random processes, one can estimate the mathematical expectation of the hourly fuel consumption during transport operations. In the final analysis, it is possible to solve the optimization problem. Namely, the choice of such undercarriage tires, which provide a minimum dispersion and mathematical expectation of the hourly fuel consumption of the transport unit. The situational combination comes down to the fact that an increase in the tire radius on one side increases the height of the center of gravity of the unit, which increases the hourly fuel consumption. On the other hand, an increase in the radius of the tire contributes to a reduction in the coefficient of rolling resistance of a wheel, and hence a decrease in fuel consumption. Thus, there is a problem of discrete optimization, namely, the choice of a tire design, in which the energy costs of the transport unit are minimized.
For citation: Myasishchev D.G., Shostenko D.N., Serebrennikov A.V. Fuel Consumption of a Straddle Forestry Tractor in Consideration of Stochastic Factors. Lesnoy Zhurnal [Russian Forestry Journal], 2020, no. 5, pp. 145–154. DOI: 10.37482/0536-1036-2020-5-145-154
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