THEORETICAL ANALYSIS OF STRENGTH RESISTANCE TO DISPLACEMENT OF IMPROVED DIGGING WORKING BODY OF POTATOE HARVESTING COMBINE

The amount of energy required to perform technological processes in agriculture largely depends on the size of the resistance to the displacement of the working bodies of machines. The main factor of energy consumption performing the technological process of potato harvesting is the resistance to the displacement of the digestive working body. In order to reduce the resistance to displacement an improved design of the digging body is proposed. An analytical study was conducted to determine the problem of moving the working body in the soil environment. The strength of the soil resistance is determined and the regularity of the influence on its change of parameters and the shape of the blade and separation parts of the digging working body is established. Calculations are made using the Mathematica application programm. The graphic dependences and contours of the isoline of the traction flange of the working part of the working body are obtained. Analysis of the calculations allowed to set the parameters of the surface of the dashboard, which provide a minimum of traction resistance. The schedule and contours of isolines of the change of the total resistance to the displacement of the soil mass with the tubers by the separation surface of the working organ in the function of the distance between the bars and the size of their intersection are also obtained. Analysis of the dependence of soil resistance and tubers on the separation surface indicates that an increase in the size of the geometric size of the intersection of the rods leads to a significant increase in the resistance of the medium. The material presented in the article can be used for analytical determination of the resistance of the excavation working body of potato harvesting machines of arbitrary geometric shape in the soil medium with tubers.

Statistical Modeling of Antiemetic Activity of Chemical Compounds

A model has been built linking the molecular structure of drugs with their antiemetic activity. It is shown that the bioactivity of drugs depends on the pseudopotential of the molecule, the information function of the molecule, and the geometric size of the substituents. The critical conditions for the emergence of effective antiemetic activity of molecules have been established. The optimal sizes of the substituents were determined, which correspond to the maximum bioactivity of the drugs. The mechanism of the threshold action of substituted benzamides was revealed.

Computational Liquid Dynamic Simulation Mixing Time from Side Inlet Mixer Tank

This study aims to investigate the mixing time of the side-entry mixer tank and the influence of the propeller's rotational speed on mixing time by the Computational Fluid Dynamic (CFD) method. The tank's model is a flat-bottom cylinder tank whose diameter is 40 cm with a 6 cm propeller contains three blades. The tracer, HCL 37%, was injected on the water's surface while the propeller's rotation speed is varied 100 rpm, 200 rpm, 300 rpm, and 400 rpm. The simulation process is examined using CFD FLUENT 17.1, with a turbulence model is k-ɛ RNG. Its conditions are single-phase then proceeded using species transport. Furthermore, the monitoring point's simulation is identical to the experimental data monitoring probe, which is used to inspect the mass fraction at each point. After all, this simulation contains three processes: pre-processing, solving, and post-processing. as a result, the propeller's higher rotational speed makes the mixing time shorter in the CFD method, which has a good agreement with the experimental method. Moreover, this study also examines the impact of the grid's type and the geometric size for the mixing process in the side-entry mixer tank.

Research studies on agricultural tractor’s fuel contamination in Mongolia

The study is presented the result of the contamination of diesel fuel of tractor which used in agricultural sector. We took the sample from tractor fuel tank when spring’s cultivating and summer and autumn harrowing time, and analyzed the amount of contamination. The samples were taken periodically from tank tractors, autoclaves and warehouses, and the amounts of contamination contained in the fuel were determined by using the tools such as the filter tool /Millipore/, drying oven /202-OAB/, electronic weight /Sartorius BSA223s/, and microscope /Lab-Kits MB-YYS-300/ in accredited fuel and oil laboratory of Techenomics Mongolia LLC. The amount of contamination depended on the refuel to tractor on the field, and the periods of the working in the field. Especially, during the spring’s sowing and summer and autumn tillage, fuel pollution was much more and the geometric size of the mechanical mixture in the fuel was increasing. Монгол орны газар тариалангийн салбарт ашиглагдаж буй тракторын түлшний бохирдлын судалгаа Газар тариалангийн салбарт ажиллаж байгаа тракторын түлшний бохирдлыг тогтоох судалгааны ажлын үр дүнг танилцуулж байна. Хаврын тариалалт болон зун, намар тариалангийн талбайд уриншийн боловсруулалт хийх үед тракторын түлшний бакнаас дээж авч, бохирдлын хэмжээг лабораторийн шинжилгээгээр тогтоов. Талбайд ажиллаж байгаа тракторуудаас түлшний дээжийг тогтсон арга зүйн дагуу зориулалтын вакуум соруулаар авсан бөгөөд “Текеномикс Монгол” ХХК-ий түлш тосны итгэмжлэгдсэн лабораторит шүүгч багаж /Millipore/, хатаах шүүгээ /202-OAB Drying Oven/, электрон жин /Sartorius BSA223s/, микроскоп /Lab-Kits MB-YYS-300/ зэрэг багажуудыг ашиглан бохирдлын хэмжээг тодорхойлов. Лабораторийн шинжилгээний дүнгээс үзэхэд түлшний бохирдлын хэмжээнд тракторын гүйцэтгэх ажлын төрөл, түүний талбайд ажиллах хугацаа нөлөөлж байна. Ялангуяа хаврын тариалалт, намар талбайн уриншийн боловсруулалт хийх үед түлшний бохирдол их, түлшинд байгаа механик хольцын геометр хэмжээ томорч байна. Түлхүүр үг: Дизель түлш, түлшний дээж, орчны тоосжилт, түлшний бохирдол

New Definition of Ultrafine Particles in Mine Paste and Its Relationship with Rheological Properties

Mine backfill paste is generally composed of tailings and coarse aggregates. In engineering practice, the definitions in fill material classification are vague. In this paper, the size range of ultrafine particles is defined by the Stokes sedimentation test and hydraulic coarseness method. The size range of ultrafine particles is affected not only by the geometric size of the particles but also by the physical characteristics of the particles themselves. This definition has more comprehensive considerations and stricter physical and mathematical significance than the traditional definition of ultrafine particles based only on size. There is a strong correlation between ultrafine particles in fill materials and the rheological properties of the mine backfill paste. In this study, through experiments and correlation analysis, it was found that the content of ultrafine particles is positively correlated with the plastic viscosity of the mine backfill paste, and its growth range is exponential. The coarse aggregate content is positively correlated with the yield stress of the mine backfill paste. A regression analysis model was established for the rheological properties of mine backfill paste. The model has few factors and high correlation, so it can simply and efficiently predict the rheological properties of mine backfill paste and guide engineering practice.

About the possibility of identification of articles from steels, aluminum, copper and alloys on their basis on the expanded micro-impurity elemental composition

Possibility of determination of the fragments and articles made of different grades of steel aluminium and copper alloys and their affiliation to the common melt was examined via the methods of photoelectric spectral analysis based on composition of micro-impurities. Chemical elements with micro-impurities were revealed; they allow to determine affiliation of metal fragments to one melt. Ultimately possible deviations of micro-impurities within one melt were obtained. The technique allowing to establish affiliation of fragments to the common melt based on their elementary composition of micro-impurities with minimal amount of measurements was suggested based on the obtained results. The minimal geometric size of a sample available for analysis was determined; it allows to classify the examined fragments to one melt based on the results of investigation of expanded elementary composition of micro-impurities. Practical opportunities of this technique were displayed on the example of the alloys with different chemical composition.

On the density of lines and Santalo’s formula for computing geometric size measures

Methods from integral geometry and geometric probability allow us to estimate geometric size measures indirectly. In this article, a Monte Carlo algorithm for simultaneous estimation of hyper-volumes and hyper-surface areas of a class of compact sets in Euclidean space is developed. The algorithm is based on Santalo’s formula and the Hadwiger formula from integral geometry, and employs a comparison principle to assign geometric probabilities. An essential component of the method is to be able to generate uniform sets of random lines on the sphere. We utilize an empirically established method to generate these random chords, and we describe a geometric randomness model associated with it. We verify our results by computing measures for hyper-ellipsoids and certain non-convex sets.

Technological Forecasting of Deformations in Flat Parts

The deformation of a part occurring in the process of grinding directly influences its exploitation and quality parameters. The instability of shape and size, which occurs due to an imbalance of residual stress, can be the one of the major causes of deformation of a part. The decrease in stress slows down the deformation process. Considering the regularities of heat source intensity dependence on the grinding modes, it can be asserted that with increasing grinding depth and grinding wheel hardness, the value increases and it decreases with a growth in a speed of the part and the use of cooling. The higher the heat removal is and the better lubricant properties of the liquid are, the more significant the decrease in is. Changing these values allows regulation of the residual stresses. As a result of the research on determination of deformations, it is recommended to reduce thermal deformations by considering the geometric size of a plate to be machined, linear expansion coefficient of plate material and an allowance for nonflatness from thermal deformations. The value of nonflatness from thermal deformations is directly proportional to linear expansion coefficient of plate material and its square overall dimensions. At the same time, the value of nonflatness is inversely proportional to the plate thickness.