Vol 9, No 3-1 (2015)

The results of study the engine oil mixtures with SUPROTEC lubricating composition are pro- vided in paper. It is shown that effect of the lubricant composition on physicochemical properties of the engine oil is negligible. It is suggested that this effect is not related to properties of oil-ultrafineparticles system, which performs a role of carrying agent in the composition.

The paper discusses temperature effect of tire tread on durability of dump trucks pneumatic tires. The results of studying the nature of heat buildup in pneumatic tires during operation are shown. Method of statistical processing of experimental data was used to obtain regression models of inves-tigated multifactor processes.

The paper provides results of strength analysis of carbon fiber composite arm for suspension of Formula Student race car. The process of searching for optimal solutions of suspension arms design parameters is provided, specifically the number of layers of reinforcing material and the direction of reinforcement. Optimum design parameters are based on obtained results. As the result of calcula- tion the paper shows diagrams, which illustrate distribution of safety margin on arm taking into ac-count the angle of reinforcement and the thickness of composite.

Paper studies the problem of nonfailure operation of dump trucks hydraulic system that is ex- ploited in the continental climate. To analyze the negative factors affecting the operation of the hy- draulic system a systematic approach has been used, based on the methodology of SADT structural analysis. The result identified that the major negative factor is instability of kinematic viscosity of working fluid over a wide range of ambient temperatures. There were developed the technique of adjusting kinematic viscosity of working fluid and the technique to improve reliability of dumptrucks hydraulic system.

The problem of constrained non-linear technical and economical optimization of maintenance the acceptable technical risk during operation of hoisting apparatus hydraulic transmission was for-mulated. It was solved through optimal choice of reliability level of individual hydraulic units.

The paper discusses applicability of different types of alternative fuels in Russia. Nowadays there are known and tested many types of alternative fuels, which are produced not from oil. These are spirits, hydrogen, ethanol, methanol, rapeseed oil, biogas, etc. The composition and features of the alternative fuels are shown. Among these fuels we would like to allocate the biogas. Biogas is an alternative source of energy and now it can also be used as a fuel for internal combustion en-gines.

It was studied the mechanism of wet purification of air from dust in innovative irrigated nozzle of regular structure made from porous plastic plates and equipped with triangular protrusions in airducts that are located across the stream for artificial turbulence. Functional link between the effi- ciency of air purification from dust and reduction of temperature in adiabatic humidification was drawn out.

The paper discusses the issue of power loss accounting in compound planetary gear sets used in design of multithreaded hybrid powerplants known also as Power-Split or PGHP. The method of determining these losses is offered.

The paper provides results of experimental and theoretical research on assessing the impact of parameters of a high-speed tracked vehicle suspension on its driving speed on different tracks. The research was conducted on commercial tracked vehicle and on vehicle with upgraded suspension. It was found out that the use of an upgraded suspension allows to increase average driving speed of vehicle by an average of 9 percent.

The paper discusses various methods for determining the forces acting on the guide elements of suspension. The analysis of methods of attachment the suspension arms to frame is provided. Stati- cally definable and statically undeterminable ways of attachment are considered. There were pro- vided the results of arms stress-strain state calculation for different ways of attachment. The ob- tained results expand the understanding of analysis methods for suspension system guide elements.