Evaluation of the effectiveness of fullerene compositions in hydrostatic drives of agricultural machines
Abstract
The analysis of application of fullerenes and fullerene additives to working liquids of hydrostatic drives is given HST-90 agricultural machinery. It is shown that the use of fullerene compositions in hydraulic oils of hydrostatic drives of agricultural machines is a promising direction and will reduce friction losses in tribosystem HST, which will lead to fuel savings, while reducing the rate of wear of materials of tribosystems and increase resource.
The purpose of this work is an experimental study of the effectiveness of fullerene compositions in hydraulic oils of hydrostatic drives and the degree of their impact on the specific fuel consumption of the drive motor. The mass of the fullerene composition 100 gram per kilogram of hydraulic oil. The composition of the fullerene composition - 0,75 gram fullerenes and 99,25 gram vegetable rapeseed oil. The total weight of the fullerene composition 100 gram was introduced into 1000 gram of base hydraulic oil MGE-46V, (10% masses).
Friction losses in tribosystems HST-90 evaluated by the magnitude of the power of the drive motor on the test bench KI-4815M. The number of the same type of HST sets, which give the necessary reliability and reproducibility of the results and is sufficient for bench tests and give the necessary reliability and reproducibility of the results for confidence q=0,90, relative error ε=0,05 and coefficient of variation υ =0,15, is equal to 12.
Tests of the HST set on the stand were performed in two stages. At the first stage of testing, the working fluid MGE-46V was used according to the technical conditions. In the second stage of the tests used working fluid MGE-46V with the addition of fullerene composition.
Experimentally obtained values of reducing the power of the electric motor on the drive HST-90 during the tests on the stand. It is established that when using a fullerene composition in the working fluid MGE-46V, the power of the electric motor to drive HST is reduced by 17,2…17,6%.
The sample size of the supply coefficients Ψ and efficiency factor η for pumps and motors has been tested for compliance with the normal distribution law. The obtained calculated values allow us to conclude that the sampling results correspond to the normal distribution law. Homogeneity and reproducibility of test results were evaluated by the value of the Cochren test, which allowed to establish – the results obtained are homogeneous and reproducible.
The use of fullerene composition in the working fluid will reduce fuel consumption by diesel agricultural machinery. On the example of a combine harvester, which uses HST-90, the reduction of diesel fuel consumption from the use of fullerene composition is calculated. When the combine harvester operates 300 operating hours per season, fuel savings will be 735 kg per one car.
