Currently, the quantitative assessment of wear product content in oils is becoming more relevant due to the introduction of diagnostic and maintenance methods based on the current condition of machinery in the agricultural sector. The changes in the physical and chemical properties of engine oils and the accumulation of wear products in them during operation help diagnose the technical condition of the key component of tractors, the engine. At the same time, it allows for the assessment of the state of the oil itself. The use of spectral analysis for the assessment of metal content in oils helped to significantly increase the speed of wear product content identification with sufficient accuracy. This diagnostic method stipulates that apart from the spectral analysis, it is necessary to conduct laboratory tests of the physical and chemical properties of oils. Any of the measured properties of engine oils can be used as a diagnostic parameter to be used for the assessment of engine condition without disassembling and the possibility of its further fault-free use for a specific time. That being said, the accuracy of the diagnostic forecast using the wear parameters depends on the accuracy of these parameters. Wear depends on a large number of factors, the majority of which are randomly manifested throughout the operation of the machinery, and the changes in the parameters can be assessed using statistical methods. At the same time, labeling some of the engine components as faulty or non-faulty depends on the accuracy of the “reference standard”, which we understand as the limit value for the wear product content in oil. This article aims at determining the limit value for the wear product content in oil using statistical methods.
The article is devoted to studying the possibility of using organic or inorganic coagulants in the process of purification of used motor oils (UMO). In experimental studies, combinations of aqueous solution of carbomide, acetic acid and isopropyl alcohol were used as coagulants. The analysis showed that the third variant of coagulant combination was the most effective. Mathematical models were obtained. Varying factors: percentage of coagulant α (%), settling temperature t (°C) and settling time τ (min−1). The mathematical model is constructed for response functions: alkaline pH number, oil color (OC) of mechanical impurities content (β). The research results showed that this coagulant improves the color of used oil. The use of this coagulant increases the alkaline number of purified oil. It reduces the content of mechanical impurities.
The article is devoted to the analysis of works on the use of alternative fuels. Reliability indicators of the elements of the compressed natural gas and diesel fuel supply system have been studied to substantiate the maintenance system. On the basis of statistical observations, the performance indicators of intensity of the event flow λ and probability of failure are obtained. It is shown that the elements of the gas and fuel supply system have high reliability. At the same time, the fuel supply system elements have slightly lower reliability than when a diesel engine is running on pure diesel fuel. It is recommended to maintain the dual-fuel gas-supply system of the diesel engine according to the regulations used for engines running on mineral fuel with additional control of the gas-supply system elements.
The article discusses the further use of used engine oil (UEO). The article presents the types of bulk materials that can be used for cleaning UEO. The advantages and disadvantages of ultrafiltration are considered. It is shown that the filtering material is characterized by a number of parameters that affect both the parameters of the filter and the efficiency of the process of cleaning the treated UEO. The mathematical model determining the dynamics of the filtering material capacity change is obtained. The results of theoretical study of pollution dynamics are compared with experimental studies. The obtained dependencies allow one to determine pressure losses and filter capacity for engineering calculations. The analysis of the influence of Reynolds’ criteria and homogeneity on the Euler criterion shows that with the increase of both Reynolds’ criterion and homogeneity criterion there is an increase in the Euler criterion, which indicates an increase in pressure loss on the filter due to its contamination.
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