Introduction. The paper explores an impact of mixed fuel on the performance of the tractor in the process of agricultural work. The aim of the study is to obtain quantitative indicators of Belarus 922 tractor. The mixed fuel consists of diesel and rapeseed oil. Materials and Methods. The operational research of the tractor with the installed set of instruments and equipment was carried out in the conditions of agricultural production. Results. We obtained quantitative performance of Belarus 922 tractor running on pure diesel oil and on mixed fuel consisting of 60 % diesel and 40 % of rapeseed oil in plowing the soil and in processing before sowing. The analysis of the data showed a change in the specific performance indicators of the tractor running on the mixed and diesel fuel during agricultural processing. When plowing Gт value increased from 11.86 to 12.54 kg/ha, the amount of NOx increased from 344.4 to 373.2 g/ha, CO value increased from 136.9 to 137.1 g/ha, C value decreased from 11.2 to 8.04 g/ha. When processing the soil before sowing Gт value increased from 4.61 to 4.86 kg/ha and NOx value from 137,9 g/ha to 151 g/ha, CO value decreased from 60.7 to 45.6 g/ha and C value decreased from 6.52 to 4.04 g/h. Conclusions. The test results demonstrate the expediency of using mixed fuel to improve the performance of Belarus 922 tractor in agricultural production.

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The relevance of computer mathematical modeling, and processing of initial experimental data for follow-up assessment and analysis of the dynamics of heat release in diesel cylinders is growing every day. The main goal of our research consists in the development of a computer model defining the dynamics of heat release in diesel cylinders when it is running on fuels with different fractional composition, based on the application of the method of the Central Research Diesel Institute by analyzing the experimental data obtained in the form of an indicator diagram. The object of research is the method of processing the obtained experimental indicator diagrams. For this purpose, indicator diagrams of a 4CHN 11.0/12.5 diesel engine of the D-245.5S2 brand were obtained in the nominal mode. To implement the software module, a Java programming procedure was used, including the Java Development Kit where the writing, launching and compilation of Java code took place, the Java Runtime Environment, the Java runtime system, where the software distribution mechanism consisted of an autonomous Java virtual machine, standard Java libraries and tools for configuring it; and the Integrated Development Environment of an integrated development environment, where tools that helped launch, edit, and compile codes that provided thermal characteristics. As a result, an analysis of the available methods for determining the characteristics of the dynamics of diesel heat release was carried out, for the first time an algorithm was developed for performing calculations by the method of the Central Research Diesel Institute and a software module for calculating the characteristics of the dynamics of heat release in diesel cylinders when using fuels of various fractional composition based on experimentally obtained indicator diagrams. The use of the proposed technique and the corresponding software module for processing indicator diagrams, and subsequent analysis of the characteristics of the dynamics of heat release in diesel cylinders provides the required quality of the research results.

The quality of the road surface is a fundamental criterion during the operation of the roadway. The article considers the issue of wear of the top layer of asphalt concrete coating from the wheels of vehicles during operation. The causes of premature destruction of the road surface have been determined. The physical and mechanical properties of asphalt concrete are presented as strength and deformation indicators. The goal is to increase the strength characteristics of road surfaces made of hot asphalt concrete mixtures, taking into account the use of the previous asphalt granulate in the formation of the upper layer of the roadway. To achieve this goal, the authors consider the factors affecting the change in strength and deformation characteristics in heavy traffic. The relevance of this direction lies in the development of public roads and is implemented within the framework of the national project Safe and high-quality highways. The established operational period of asphalt concrete is ensured by the correct choice of components and components for the formation of a high-quality mixture. The authors of the article consider the possibility of forming a road surface with specified characteristics by regulating the properties of asphalt concrete and its structure using crushed asphalt granulate in the technological process. The dependences of the strength of the dispersed system on the fractional size of the asphalt granulate are presented. The use of granulate in the fractional composition of two standard sizes in a ratio of 50 % to 50 % improves the strength and deformation properties of the roadway, increases the adhesion of the binder and the water resistance of the asphalt concrete coating. According to the results of experimental studies, the technological sequence of the mixture formation with the use of asphalt granulate, as well as its fractional and volumetric composition in the total volume of the mixture is proposed.

Рассмотрены основные проблемы, связанные с эксплуатацией асфальтобетонных покрытий, их износом от колес транс-портных средств с увеличением интенсивности дорожного движения. Поставлена задача повышение прочностных показателей дорожных покрытий из горячих асфальтобетонных смесей, с учетом технологических возможностей современных уплотняющих машин. Для достижения поставленной цели рассмотрены факторы, влияющие на повышение эксплуатационных параметров дорожных покрытий. Представлена расчетная схема взаимодействия вальца катка и уплотняемого материала, а также функциональная зависимость состояния напряжения в зоне контакта. По результатам экспериментального исследования приведено рекомендуемое количество проходов катка по одному следу при формировании дорожного полотна. Сделан вывод о влиянии уплотнения горячих асфальтовых смесей в процессе формирования дорожного полотна различными вальцами дорожно строительных машин.